Sensors | Special Issue : Nanomaterials for Environmental and Biological Monitoring

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air quality & environmental engineering; material engineering; coordination polymers; metal-organic frameworks (mofs)"> <div class="editor-div__content smaller-pictures"> <div class='profile-card-drop' data-dropdown='profile-card-drop230' data-options='is_hover:true, hover_timeout:5000'> <div class="sciprofiles-link" style="display: inline-block"><div class="sciprofiles-link__link"><img class="sciprofiles-link__image" src="/data/editors/editor_230.png?1722230806" style= "width: auto; height: 16px; border-radius: 50%;"><span class="sciprofiles-link__name"> Prof. Dr. Ki-Hyun Kim </span></div></div> </div> <div id="profile-card-drop230" data-dropdown-content class="f-dropdown content profile-card-content" aria-hidden="true" tabindex="-1"> <div class="profile-card__title "> <div class="sciprofiles-link" style="display: inline-block"><div class="sciprofiles-link__link"><img class="sciprofiles-link__image" src="/data/editors/editor_230.png?1722230806" style= "width: auto; height: 16px; border-radius: 50%;"><span class="sciprofiles-link__name"> Prof. Dr. Ki-Hyun Kim </span></div></div> </div> <div class="profile-card__buttons" style="margin-bottom: 10px;"> <a href="https://sciprofiles.com/profile/77936?utm_source=mdpi.com&utm_medium=website&utm_campaign=avatar_name" class="button button--color-inversed" target="_blank"> SciProfiles </a> <a href="https://scilit.net/scholars?q=Ki-Hyun%20Kim" class="button button--color-inversed" target="_blank"> Scilit </a> <a href="https://www.preprints.org/search?search1=Ki-Hyun%20Kim&field1=authors" class="button button--color-inversed" target="_blank"> Preprints.org </a> <a href="https://scholar.google.com/scholar?q=Ki-Hyun%20Kim" class="button button--color-inversed" target="_blank" rels="noopener noreferrer"> Google Scholar </a> </div> </div> <br class="show-for-small-only" /> <a title="Highly Cited - Clarivate Analytics (formerly Thomson Reuters) 2023, 2022, 2021" target="_blank" rel="noopener noreferrer" href=" https://recognition.webofsciencegroup.com/awards/highly-cited/2020/ "> <i class="material-icons yellow-star">grade</i> </a> <a class="inline-spacer toEncode emailCaptcha" href="" data-editor-id="230">E-Mail</a> <a class="inline-spacer" href="http://civil.hanyang.ac.kr/eng/staff_view01.html?id_no=73&PHPSESSID=8320f1b708f5a15e2fe138bb30360252" target="_blank" rel="noopener noreferrer">Website</a> <br/> <i>Guest Editor</i><br> </div> <div style="clear: both;"></div> <div class="editor-div__content smaller-pictures"> Department of Civil & Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea<br> <b>Interests:</b> environmental & biomedical monitoring; air quality & environmental engineering; material engineering; coordination polymers; metal-organic frameworks (MOFs)<br> <a href="#" id="editor_contrib_230" onclick="div_toggle(this.id); return false;">Special Issues, Collections and Topics in MDPI journals</a> <div id="div_editor_contrib_230" style="display: none"> Special Issue in <a href="/journal/sensors/special_issues/odorous_compounds"> <i>Sensors</i>: Monitoring of Odorous Compounds in the Environment</a><br> Special Issue in <a href="/journal/sensors/special_issues/odor_sensing"> <i>Sensors</i>: Direct and Indirect Sensing of Odor and VOCs and Their Control</a><br> Special Issue in <a href="/journal/sensors/special_issues/toxic_metal"> <i>Sensors</i>: Sensing of Toxic and Hazardous Metals in Various Environmental Media</a><br> Special Issue in <a href="/journal/sensors/special_issues/odor_detection"> <i>Sensors</i>: Odor Detection: Electronic Nose, Olfactometer, and Advanced Instrumentation</a><br> Special Issue in <a href="/journal/sensors/special_issues/ssfso"> <i>Sensors</i>: Sensing of Scent, Fragrance, Smell, and Odor Emissions from Biota Sources</a><br> Special Issue in <a href="/journal/sensors/special_issues/sensing-pollution"> <i>Sensors</i>: Modern Technologies for Sensing Pollution in Air, Water, and Soil</a><br> Special Issue in <a href="/journal/sensors/special_issues/Materials_SensingApplications"> <i>Sensors</i>: The Use of New and/or Improved Materials for Sensing Applications</a><br> Special Issue in <a href="/journal/environments/special_issues/VOC"> <i>Environments</i>: Volatile Organic Compounds in Environment</a><br> Special Issue in <a href="/journal/environments/special_issues/odor"> <i>Environments</i>: Odor and VOCs: Human Perception, Sensing, and Treatment</a><br> Special Issue in <a href="/journal/sensors/special_issues/MOFVSA"> <i>Sensors</i>: Metal-Organic Frameworks for Various Sensing Applications</a><br> Special Issue in <a href="/journal/applsci/special_issues/Advanced_or_Conventional_Materials_as_Sorbent"> <i>Applied Sciences</i>: Advanced or Conventional Materials as Sorbent</a><br> Special Issue in <a href="/journal/applsci/special_issues/Conventional_Materials_as_Sorbent"> <i>Applied Sciences</i>: Advanced or Conventional Materials as Sorbent Ⅱ</a><br> Special Issue in <a href="/journal/nanomaterials/special_issues/mof_based"> <i>Nanomaterials</i>: MOF-Based Nanostructured Materials: Synthesis and Applications</a><br> Special Issue in <a href="/journal/sensors/special_issues/SAHE6A0M7Q"> <i>Sensors</i>: Metal-Organic Frameworks Based Advanced Sensors for Pollutant Detection</a><br> Topics: <a href="/topics/Metals_Metal_Oxide">Synthesis and Applications of Nanostructured Metals and Metal Oxides</a><br> Topics: <a href="/topics/Advanced_Nanomaterials_for_Sensing">Advanced Nanomaterials for Sensing Applications</a><br> </div> </div> </div> </div> <h2><a name="info"></a>Special Issue Information</h2> <div> <p>Dear Colleague,</p> <p>Over the past decades, advances in nanotechnology have been achieved through the synthesis and/or production of new and improved nanomaterials (NMs: e.g., imprinted polymers (IPs), metal–organic frameworks (MOFs), carbon nanotubes (CNTs), quantum dots (QDs), metal oxides (MOs), and their diverse derivatives). These NMs have been applied extensively to develop various sensing tools and devices in various fields due to their numerous favorable properties in terms of porosity, surface area, pore volume, receptor sites, thermal and chemical stability, selectivity, low toxicity, luminescence, and chemical functionality. The introduction of these advanced functional NMs has contributed greatly to the progress of NM-based sensing technology to resolve the limitations that conventional methods suffer from. In light of this advancement in NM-based sensing technology, this Special Issue is proposed to invite researchers who have been involved in the development and application of sensing techniques to detect various targets (metals, organics, and biological targets) in diverse environmental or biological media.</p> <p>Prof. Dr. Ki-Hyun Kim<br /><em>Guest Editor</em></p> <p><p><strong>Manuscript Submission Information</strong><p> <p>Manuscripts should be submitted online at <a href="https://www.mdpi.com/">www.mdpi.com</a> by <a href="https://www.mdpi.com/user/register/">registering</a> and <a href="https://www.mdpi.com/user/login/">logging in to this website</a>. Once you are registered, <a href="https://susy.mdpi.com/user/manuscripts/upload/?journal=sensors">click here to go to the submission form</a>. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.</p> <p>Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the <a href="https://www.mdpi.com/journal/sensors/instructions">Instructions for Authors</a> page. <a href="https://www.mdpi.com/journal/sensors/"><em>Sensors</em></a> is an international peer-reviewed open access semimonthly journal published by MDPI.</p> <p> Please visit the <a href="https://www.mdpi.com/journal/sensors/instructions">Instructions for Authors</a> page before submitting a manuscript. The <a href="https://www.mdpi.com/about/apc/">Article Processing Charge (APC)</a> for publication in this <a href="https://www.mdpi.com/about/openaccess/">open access</a> journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's <a href="https://www.mdpi.com/authors/english">English editing service</a> prior to publication or during author revisions. </p></p> </div> <h2><a name="keywords"></a>Keywords</h2> <div><ul> <li>materials</li> <li>sensing</li> <li>functionality</li> <li>synthesis</li> <li>modification</li> </ul></div> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"> <html><body><h2><a name="benefits"></a>Benefits of Publishing in a Special Issue</h2> <ul> <li>Ease of navigation: Grouping papers by topic helps scholars navigate broad scope journals more efficiently.</li> <li>Greater discoverability: Special Issues support the reach and impact of scientific research. 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return false;">Ok</a> </div> </div> <a class="close-reveal-modal" aria-label="Close"> <i class="material-icons">clear</i> </a> </div> </div> <div> <div style="clear: both"></div> </div> </div> </div> <div class="generic-item type-section" id=Research> <h2>Research</h2> <div style="margin-top: 15px;"> </div> </div> <div class="generic-item article-item"> <input class="article-list-checkbox export-element" type="checkbox" name="articles_ids[]" value="488810" data-select-all-name="article-listing"> <div class="article-content"> <div class="label right label__btn"> <a data-dropdown="drop-supplementary-488810" aria-controls="drop-supplementary-488810" aria-expanded="false" title="Supplementary Material"> <i class="material-icons">attachment</i> </a> <div id="drop-supplementary-488810" class="f-dropdown label__btn__dropdown label__btn__dropdown--wide" data-dropdown-content aria-hidden="true" tabindex="-1"> Supplementary material: <br/> <a href="/1424-8220/21/3/883/s1?version=1611839116"> Supplementary File 1 (PDF, 559 KiB) </a><br/> </div> </div> <div class="label right label__btn"> <span style="font-size: 12px; color: #1a1a1a;"> 13 pages, 7137 KiB   </span> <a href="/1424-8220/21/3/883/pdf?version=1611884572" class="UD_Listings_ArticlePDF" title="Article PDF" data-name="Linker-Free Magnetite-Decorated Gold Nanoparticles (Fe3O4-Au): Synthesis, Characterization, and Application for Electrochemical Detection of Arsenic (III)" data-journal="sensors"> <i class="material-icons custom-download"></i> </a> </div> <div class="article-icons"><span class="label openaccess" data-dropdown="drop-article-label-openaccess" aria-expanded="false">Open Access</span><span class="label articletype">Article</span></div> <a class="title-link" href="/1424-8220/21/3/883">Linker-Free Magnetite-Decorated Gold Nanoparticles (Fe<sub>3</sub>O<sub>4</sub>-Au): Synthesis, Characterization, and Application for Electrochemical Detection of Arsenic (III)</a> <div class="authors"> by <span class="inlineblock "><strong>Mohammed Sedki</strong>, </span><span class="inlineblock "><strong>Guo Zhao</strong>, </span><span class="inlineblock "><strong>Shengcun Ma</strong>, </span><span class="inlineblock "><strong>David Jassby</strong> and </span><span class="inlineblock "><strong>Ashok Mulchandani</strong></span> </div> <div class="color-grey-dark"> <em>Sensors</em> <b>2021</b>, <em>21</em>(3), 883; <a href="https://doi.org/10.3390/s21030883">https://doi.org/10.3390/s21030883</a> - 28 Jan 2021 </div> <a href="/1424-8220/21/3/883#metrics">Cited by 26</a> | Viewed by 5262 <div class="abstract-div"> <a href="#" onclick="$(this).next('.abstract-cropped').toggleClass('inline').next('.abstract-full').toggleClass('inline'); return false;"> <strong>Abstract </strong> </a> <div class="abstract-cropped inline"> Linker-free magnetite nanoparticles (Fe<sub>3</sub>O<sub>4</sub>NPs)-decorated gold nanoparticles (AuNPs) were grown using a new protocol that can be used as a new platform for synthesis of other intact metal–metal oxide nanocomposites without the need for linkers. This minimizes the distance between <a href="#" data-counterslink = "https://www.mdpi.com/1424-8220/21/3/883/more" onclick="$(this).parents('.abstract-cropped').toggleClass('inline').next('.abstract-full').toggleClass('inline'); return false;"> [...] Read more.</a> </div> <div class="abstract-full "> Linker-free magnetite nanoparticles (Fe<sub>3</sub>O<sub>4</sub>NPs)-decorated gold nanoparticles (AuNPs) were grown using a new protocol that can be used as a new platform for synthesis of other intact metal–metal oxide nanocomposites without the need for linkers. This minimizes the distance between the metal and metal oxide nanoparticles and ensures the optimum combined effects between the two material interfaces. X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy confirmed the successful synthesis of the Fe<sub>3</sub>O<sub>4</sub>-Au nanocomposite, without any change in the magnetite phase. Characterization, using transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy, revealed the composite to consist of AuNPs of 70 ± 10 nm diameter decorated with tiny 10 ± 3 nm diameter Fe<sub>3</sub>O<sub>4</sub>NPs in Au:Fe mass ratio of 5:1. The prepared Fe<sub>3</sub>O<sub>4</sub>-Au nanocomposite was embedded in ionic liquid (IL) and applied for the modification of glassy carbon electrode (GCE) for the electrochemical detection of As(III) in water. By combining the excellent catalytic properties of the AuNPs with the high adsorption capacity of the tiny Fe<sub>3</sub>O<sub>4</sub>NPs towards As(III), as well as the good conductivity of IL, the Fe<sub>3</sub>O<sub>4</sub>-Au-IL nanocomposite showed excellent performance in the square wave anodic stripping voltammetry detection of As(III). Under the optimized conditions, a linear range of 1 to 100 μg/L was achieved with a detection limit of 0.22 μg/L (S/N = 3), and no interference from 100-fold higher concentrations of a wide variety of cations and anions found in water. A very low residual standard deviation of 1.16% confirmed the high precision/reproducibility of As(III) analysis and the reliability of the Fe<sub>3</sub>O<sub>4</sub>-Au-IL sensing interface. Finally, this proposed sensing interface was successfully applied to analyzing synthetic river and wastewater samples with a 95–101% recovery, demonstrating excellent accuracy, even in complex synthetic river and wastewater samples containing high concentrations of humic acid without any sample pretreatments. <a href="/1424-8220/21/3/883">Full article</a> </div> </div> <div class="belongsTo" style="margin-bottom: 10px;"> (This article belongs to the Special Issue <a href=" /journal/sensors/special_issues/NEBM ">Nanomaterials for Environmental and Biological Monitoring</a>)<br/> </div> <a href="#" class="abstract-figures-show" data-counterslink = "https://www.mdpi.com/1424-8220/21/3/883/show" ><span >►</span><span style=" display: none;">▼</span> Show Figures </a><div class="abstract-image-preview "><div class="arrow left-arrow" id="prev488810"><i class="fa fa-caret-left"></i></div><div class="arrow right-arrow" id="next488810"><i class="fa fa-caret-right"></i></div><div class="absgraph cycle-slideshow manual" data-cycle-fx="scrollHorz" data-cycle-timeout="0" data-cycle-next="#next488810" data-cycle-prev="#prev488810" data-cycle-progressive="#images488810" data-cycle-slides=">div" data-cycle-log="false"><div class='openpopupgallery cycle-slide' data-imgindex='0' data-target='article-488810-popup'><span class="helper"></span><img src="data:image/gif;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=" data-src="https://pub.mdpi-res.com/sensors/sensors-21-00883/article_deploy/html/images/sensors-21-00883-g001-550.jpg?1611884660" alt="" style="border: 0;"><p>Figure 1</p></div><script id="images488810" type="text/cycle" data-cycle-split="---"><div class='openpopupgallery' data-imgindex='1' data-target='article-488810-popup'><span class="helper"></span><img src='https://pub.mdpi-res.com/sensors/sensors-21-00883/article_deploy/html/images/sensors-21-00883-g002-550.jpg?1611884660'><p>Figure 2</p></div> --- <div class='openpopupgallery' data-imgindex='2' data-target='article-488810-popup'><span class="helper"></span><img src='https://pub.mdpi-res.com/sensors/sensors-21-00883/article_deploy/html/images/sensors-21-00883-g003-550.jpg?1611884660'><p>Figure 3</p></div> --- <div class='openpopupgallery' data-imgindex='3' data-target='article-488810-popup'><span class="helper"></span><img src='https://pub.mdpi-res.com/sensors/sensors-21-00883/article_deploy/html/images/sensors-21-00883-g004-550.jpg?1611884660'><p>Figure 4</p></div> --- <div class='openpopupgallery' data-imgindex='4' data-target='article-488810-popup'><span class="helper"></span><img src='https://pub.mdpi-res.com/sensors/sensors-21-00883/article_deploy/html/images/sensors-21-00883-g005-550.jpg?1611884660'><p>Figure 5</p></div> --- <div class='openpopupgallery' data-imgindex='5' data-target='article-488810-popup'><span class="helper"></span><img src='https://pub.mdpi-res.com/sensors/sensors-21-00883/article_deploy/html/images/sensors-21-00883-g006-550.jpg?1611884660'><p>Figure 6</p></div> --- <div class='openpopupgallery' data-imgindex='6' data-target='article-488810-popup'><span class="helper"></span><img src='https://pub.mdpi-res.com/sensors/sensors-21-00883/article_deploy/html/images/sensors-21-00883-g007-550.jpg?1611884660'><p>Figure 7</p></div> --- <div class='openpopupgallery' data-imgindex='7' data-target='article-488810-popup'><span class="helper"></span><img src='https://pub.mdpi-res.com/sensors/sensors-21-00883/article_deploy/html/images/sensors-21-00883-g008-550.jpg?1611884660'><p>Figure 8</p></div></script></div></div><div id="article-488810-popup" class="popupgallery" style="display: inline; line-height: 200%"><a href="https://pub.mdpi-res.com/sensors/sensors-21-00883/article_deploy/html/images/sensors-21-00883-g001-550.jpg?1611884660" title=" <strong>Figure 1</strong><br/> <p>Schematic of Fe<sub>3</sub>O<sub>4</sub>-Au nanoparticle preparation and the suggested mechanism of its formation.</p> <strong style='display: block; margin-top: 10px; font-size: 18px;'><a style='color: #fff' href='/1424-8220/21/3/883'>Full article</a></strong> "></a><a href="https://pub.mdpi-res.com/sensors/sensors-21-00883/article_deploy/html/images/sensors-21-00883-g002-550.jpg?1611884660" title=" <strong>Figure 2</strong><br/> <p>Electron microscopy images. (<b>a</b>) SEM image of a thin film of Fe<sub>3</sub>O<sub>4</sub>-Au nanocomposite on a silicon wafer sputtered with Pd/Pt, (<b>b</b>) a higher resolution TEM image of the prepared nanocomposite, and (<b>c</b>,<b>d</b>) TEM images of the Fe<sub>3</sub>O<sub>4</sub>NPs.</p> <strong style='display: block; margin-top: 10px; font-size: 18px;'><a style='color: #fff' href='/1424-8220/21/3/883'>Full article</a></strong> "></a><a href="https://pub.mdpi-res.com/sensors/sensors-21-00883/article_deploy/html/images/sensors-21-00883-g003-550.jpg?1611884660" title=" <strong>Figure 3</strong><br/> <p>XRD patterns of Fe<sub>3</sub>O<sub>4</sub>NPs and Fe<sub>3</sub>O<sub>4</sub>-Au.</p> <strong style='display: block; margin-top: 10px; font-size: 18px;'><a style='color: #fff' href='/1424-8220/21/3/883'>Full article</a></strong> "></a><a href="https://pub.mdpi-res.com/sensors/sensors-21-00883/article_deploy/html/images/sensors-21-00883-g004-550.jpg?1611884660" title=" <strong>Figure 4</strong><br/> <p>FTIR spectra of Fe<sub>3</sub>O<sub>4</sub> (red), Au (yellow), and Fe<sub>3</sub>O<sub>4</sub>-Au (blue).</p> <strong style='display: block; margin-top: 10px; font-size: 18px;'><a style='color: #fff' href='/1424-8220/21/3/883'>Full article</a></strong> "></a><a href="https://pub.mdpi-res.com/sensors/sensors-21-00883/article_deploy/html/images/sensors-21-00883-g005-550.jpg?1611884660" title=" <strong>Figure 5</strong><br/> <p>(<b>A</b>) Effect of the deposition potential, (<b>B</b>) deposition time and (<b>C</b>) weight ratio between Fe and Au on stripping current for 20 ppb (<b>A</b>,<b>B</b>) and 50 ppb (<b>C</b>) of As(III) in 0.2 M pH 5.5 acetate buffer at Fe<sub>3</sub>O<sub>4</sub>-Au-IL/GCE. Each data point is an average of 5 measurements from 3 electrodes and error bars represent ±1 standard deviation.</p> <strong style='display: block; margin-top: 10px; font-size: 18px;'><a style='color: #fff' href='/1424-8220/21/3/883'>Full article</a></strong> "></a><a href="https://pub.mdpi-res.com/sensors/sensors-21-00883/article_deploy/html/images/sensors-21-00883-g006-550.jpg?1611884660" title=" <strong>Figure 6</strong><br/> <p>(<b>A</b>) The SWASV responses of 50 μg/L As(III) on different modified electrodes; (a) bare GCE, (b) Fe<sub>3</sub>O<sub>4</sub>NPs/GCE, (c) AuNPs/GCE, (d) Fe<sub>3</sub>O<sub>4</sub>-Au/GCE and (e) Fe<sub>3</sub>O<sub>4</sub>-Au-IL/GCE. (<b>B</b>) The catalytic mechanism of Fe<sub>3</sub>O<sub>4-</sub>Au in the electroanalysis of As(III). Glassy carbon electrode (GCE); ionic liquid (IL).</p> <strong style='display: block; margin-top: 10px; font-size: 18px;'><a style='color: #fff' href='/1424-8220/21/3/883'>Full article</a></strong> "></a><a href="https://pub.mdpi-res.com/sensors/sensors-21-00883/article_deploy/html/images/sensors-21-00883-g007-550.jpg?1611884660" title=" <strong>Figure 7</strong><br/> <p>(<b>A</b>) SWAS voltammograms for additions of 0, 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100 μg/L As(III). (<b>B</b>) The corresponding calibration curve of As(III).</p> <strong style='display: block; margin-top: 10px; font-size: 18px;'><a style='color: #fff' href='/1424-8220/21/3/883'>Full article</a></strong> "></a><a href="https://pub.mdpi-res.com/sensors/sensors-21-00883/article_deploy/html/images/sensors-21-00883-g008-550.jpg?1611884660" title=" <strong>Figure 8</strong><br/> <p>The selectivity of the proposed sensor in the presence of high concentrations of different ions (<b>A</b>: Cation; <b>B</b>: Anion) on the stripping peak current of 50 μg/L As(III) at Fe<sub>3</sub>O<sub>4</sub>-Au-IL/GCE in 0.2 M acetate buffer (pH 5.0). Each data point is an average of 5 measurements from 3 electrodes and error bars represent ±1 standard deviation.</p> <strong style='display: block; margin-top: 10px; font-size: 18px;'><a style='color: #fff' href='/1424-8220/21/3/883'>Full article</a></strong> "></a></div> </div> </div> <div class="generic-item article-item"> <input class="article-list-checkbox export-element" type="checkbox" name="articles_ids[]" value="350536" data-select-all-name="article-listing"> <div class="article-content"> <div class="label right label__btn"> <span style="font-size: 12px; color: #1a1a1a;"> 12 pages, 3580 KiB   </span> <a href="/1424-8220/20/9/2455/pdf?version=1588086623" class="UD_Listings_ArticlePDF" title="Article PDF" data-name="Cu2O/PEDOT:PSS/ZnO Nanocomposite Material Biosensor for Esophageal Cancer Detection" data-journal="sensors"> <i class="material-icons custom-download"></i> </a> </div> <div class="article-icons"><span class="label openaccess" data-dropdown="drop-article-label-openaccess" aria-expanded="false">Open Access</span><span class="label articletype">Article</span></div> <a class="title-link" href="/1424-8220/20/9/2455">Cu<sub>2</sub>O/PEDOT:PSS/ZnO Nanocomposite Material Biosensor for Esophageal Cancer Detection</a> <div class="authors"> by <span class="inlineblock "><strong>Kuang-Wen Tseng</strong>, </span><span class="inlineblock "><strong>Yu-Ping Hsiao</strong>, </span><span class="inlineblock "><strong>Chun-Ping Jen</strong>, </span><span class="inlineblock "><strong>Tsung-Shun Chang</strong> and </span><span class="inlineblock "><strong>Hsiang-Chen Wang</strong></span> </div> <div class="color-grey-dark"> <em>Sensors</em> <b>2020</b>, <em>20</em>(9), 2455; <a href="https://doi.org/10.3390/s20092455">https://doi.org/10.3390/s20092455</a> - 26 Apr 2020 </div> <a href="/1424-8220/20/9/2455#metrics">Cited by 18</a> | Viewed by 3924 <div class="abstract-div"> <a href="#" onclick="$(this).next('.abstract-cropped').toggleClass('inline').next('.abstract-full').toggleClass('inline'); return false;"> <strong>Abstract </strong> </a> <div class="abstract-cropped inline"> A highly sensitive photoelectrochemical (PEC) biosensor without external bias was developed in this study. The biosensor was configured with a p-Cu<sub>2</sub>O and n-ZnO heterostructure. Hexamethylenetetramine (HMTA) and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) was used to improve the crystal structure of Cu<sub>2</sub> <a href="#" data-counterslink = "https://www.mdpi.com/1424-8220/20/9/2455/more" onclick="$(this).parents('.abstract-cropped').toggleClass('inline').next('.abstract-full').toggleClass('inline'); return false;"> [...] Read more.</a> </div> <div class="abstract-full "> A highly sensitive photoelectrochemical (PEC) biosensor without external bias was developed in this study. The biosensor was configured with a p-Cu<sub>2</sub>O and n-ZnO heterostructure. Hexamethylenetetramine (HMTA) and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) was used to improve the crystal structure of Cu<sub>2</sub>O and ZnO and reduce the defects in the Cu<sub>2</sub>O/ZnO interface. This fabrication method provided the highly crystallized Cu<sub>2</sub>O/ZnO structure with excellent electrical property and photoresponse in visible light. The structure was applied to a biosensor for detecting two different cancerous levels of esophageal cells, namely, OE21 and OE21-1, with a high gain in photocurrent (5.8 and 6.2 times, respectively) and a low detection limit (3000 cells in 50 μL). We believe that such a p-n heterojunction PEC biosensor could advance biosensor development and provide a promising candidate for biomedical applications. <a href="/1424-8220/20/9/2455">Full article</a> </div> </div> <div class="belongsTo" style="margin-bottom: 10px;"> (This article belongs to the Special Issue <a href=" /journal/sensors/special_issues/NEBM ">Nanomaterials for Environmental and Biological Monitoring</a>)<br/> </div> <a href="#" class="abstract-figures-show" data-counterslink = "https://www.mdpi.com/1424-8220/20/9/2455/show" ><span >►</span><span style=" display: none;">▼</span> Show Figures </a><div class="abstract-image-preview "><div class="arrow left-arrow" id="prev350536"><i class="fa fa-caret-left"></i></div><div class="arrow right-arrow" id="next350536"><i class="fa fa-caret-right"></i></div><div class="absgraph cycle-slideshow manual" data-cycle-fx="scrollHorz" data-cycle-timeout="0" data-cycle-next="#next350536" data-cycle-prev="#prev350536" data-cycle-progressive="#images350536" data-cycle-slides=">div" data-cycle-log="false"><div class='openpopupgallery cycle-slide' data-imgindex='0' data-target='article-350536-popup'><span class="helper"></span><img src="data:image/gif;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=" data-src="https://pub.mdpi-res.com/sensors/sensors-20-02455/article_deploy/html/images/sensors-20-02455-g001-550.jpg?1602188923" alt="" style="border: 0;"><p>Figure 1</p></div><script id="images350536" type="text/cycle" data-cycle-split="---"><div class='openpopupgallery' data-imgindex='1' data-target='article-350536-popup'><span class="helper"></span><img src='https://pub.mdpi-res.com/sensors/sensors-20-02455/article_deploy/html/images/sensors-20-02455-g002-550.jpg?1602188923'><p>Figure 2</p></div> --- <div class='openpopupgallery' data-imgindex='2' data-target='article-350536-popup'><span class="helper"></span><img src='https://pub.mdpi-res.com/sensors/sensors-20-02455/article_deploy/html/images/sensors-20-02455-g003-550.jpg?1602188923'><p>Figure 3</p></div> --- <div class='openpopupgallery' data-imgindex='3' data-target='article-350536-popup'><span class="helper"></span><img src='https://pub.mdpi-res.com/sensors/sensors-20-02455/article_deploy/html/images/sensors-20-02455-g004-550.jpg?1602188923'><p>Figure 4</p></div> --- <div class='openpopupgallery' data-imgindex='4' data-target='article-350536-popup'><span class="helper"></span><img src='https://pub.mdpi-res.com/sensors/sensors-20-02455/article_deploy/html/images/sensors-20-02455-g005-550.jpg?1602188923'><p>Figure 5</p></div> --- <div class='openpopupgallery' data-imgindex='5' data-target='article-350536-popup'><span class="helper"></span><img src='https://pub.mdpi-res.com/sensors/sensors-20-02455/article_deploy/html/images/sensors-20-02455-g006-550.jpg?1602188923'><p>Figure 6</p></div> --- <div class='openpopupgallery' data-imgindex='6' data-target='article-350536-popup'><span class="helper"></span><img src='https://pub.mdpi-res.com/sensors/sensors-20-02455/article_deploy/html/images/sensors-20-02455-g007-550.jpg?1602188923'><p>Figure 7</p></div></script></div></div><div id="article-350536-popup" class="popupgallery" style="display: inline; line-height: 200%"><a href="https://pub.mdpi-res.com/sensors/sensors-20-02455/article_deploy/html/images/sensors-20-02455-g001-550.jpg?1602188923" title=" <strong>Figure 1</strong><br/> <p>Schemes of six photoelectrochemical biosensors based on: (<b>a</b>–<b>c</b>) Cu<sub>2</sub>O/ZnO; (<b>d</b>–<b>f</b>) Cu<sub>2</sub>O/poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS)/ZnO heterostructure in this work.</p> <strong style='display: block; margin-top: 10px; font-size: 18px;'><a style='color: #fff' href='/1424-8220/20/9/2455'>Full article</a></strong> "></a><a href="https://pub.mdpi-res.com/sensors/sensors-20-02455/article_deploy/html/images/sensors-20-02455-g002-550.jpg?1602188923" title=" <strong>Figure 2</strong><br/> <p>Scheme of the experimental setup used for the photoresponse characterization system. Cells suspension is directly dripped onto 2 × 2 cm<sup>2</sup> biosensor without any immobilization.</p> <strong style='display: block; margin-top: 10px; font-size: 18px;'><a style='color: #fff' href='/1424-8220/20/9/2455'>Full article</a></strong> "></a><a href="https://pub.mdpi-res.com/sensors/sensors-20-02455/article_deploy/html/images/sensors-20-02455-g003-550.jpg?1602188923" title=" <strong>Figure 3</strong><br/> <p>Cross-sectional SEM images of (<b>a</b>) Cu2O/ZnO NRs; (<b>b</b>) Cu2O/PEDOT:PSS/ZnO NRs; (<b>c</b>) Cu2O with hexamethylenetetramine (HMTA)/PEDOT:PSS/ZnO NRs; (<b>d</b>) Cu2O 25 min + Cu2O with HMTA 5 min/PEDOT:PSS/ZnO NRs heterostructure.</p> <strong style='display: block; margin-top: 10px; font-size: 18px;'><a style='color: #fff' href='/1424-8220/20/9/2455'>Full article</a></strong> "></a><a href="https://pub.mdpi-res.com/sensors/sensors-20-02455/article_deploy/html/images/sensors-20-02455-g004-550.jpg?1602188923" title=" <strong>Figure 4</strong><br/> <p>XRD patterns of samples based on Cu<sub>2</sub>O/ZnO and Cu<sub>2</sub>O/PEDOT:PSS/ZnO heterostructure. With the help of HMTA and PEDOT:PSS, the signal in the preferred direction, (111) of Cu<sub>2</sub>O and (002) of ZnO, becomes stronger.</p> <strong style='display: block; margin-top: 10px; font-size: 18px;'><a style='color: #fff' href='/1424-8220/20/9/2455'>Full article</a></strong> "></a><a href="https://pub.mdpi-res.com/sensors/sensors-20-02455/article_deploy/html/images/sensors-20-02455-g005-550.jpg?1602188923" title=" <strong>Figure 5</strong><br/> <p>Electrical and optical properties of the biosensors in the depositional environment with different electrolytes: (<b>a</b>) I–V characteristics under bias potentials from 0 to 6 V; (<b>b</b>) absorption spectra in the range 300–1000 nm; (<b>c</b>) photo-response spectra from 300–800 nm.</p> <strong style='display: block; margin-top: 10px; font-size: 18px;'><a style='color: #fff' href='/1424-8220/20/9/2455'>Full article</a></strong> "></a><a href="https://pub.mdpi-res.com/sensors/sensors-20-02455/article_deploy/html/images/sensors-20-02455-g006-550.jpg?1602188923" title=" <strong>Figure 6</strong><br/> <p>(<b>a</b>) Photocurrent responses of 100 μM GSSG, 100 μM glutathione (GSH), and pure PBS in 500 μL. Photocurrent response of biosensors to the following cells in 50 μL; (<b>b</b>) without esophageal cancer cells; (<b>c</b>) esophageal cancer cells (OE21); (<b>d</b>) esophageal cancer cells (OE21-1); (<b>e</b>) Cu<sub>2</sub>O 25 min + Cu<sub>2</sub>O with HMTA 5 min/PEDOT:PSS/ZnO shows considerable photocurrent response difference between OE21 and OE21-1. Cu<sub>2</sub>O with HMTA/PEDOT:PSS/ZnO presents high gain of 5.8 and 6.2 times in the detection of OE21 and OE21-1, respectively.</p> <strong style='display: block; margin-top: 10px; font-size: 18px;'><a style='color: #fff' href='/1424-8220/20/9/2455'>Full article</a></strong> "></a><a href="https://pub.mdpi-res.com/sensors/sensors-20-02455/article_deploy/html/images/sensors-20-02455-g007-550.jpg?1602188923" title=" <strong>Figure 7</strong><br/> <p>Illustration of the photoelectrochemical (PEC) mechanism for GSSG detection by a biosensor based on Cu2O/PEDOT:PSS/ZnO stepwise energy-level heterostructure.</p> <strong style='display: block; margin-top: 10px; font-size: 18px;'><a style='color: #fff' href='/1424-8220/20/9/2455'>Full article</a></strong> "></a></div> </div> </div> <div class="row footer"> <div class="listing-select-options"> <div class="columns small-12"> <div class="select generic-item"> <a href="#" class="export-options-show export-element export-expanded"> Show export 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