Nanostructured Surface Enhances Spectroscopy Signals

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class="b_textmedia__figure"><picture><source srcset="/fileadmin/_processed_/1/7/csm_1124-102-AI-News-Nanostructured-Surface-Enhances-Spectroscopy-Signals_In-Article_cec5ee3aec.webp" media="(min-width: 1280px)" type="image/webp" /><source srcset="/fileadmin/_processed_/1/7/csm_1124-102-AI-News-Nanostructured-Surface-Enhances-Spectroscopy-Signals_In-Article_18c37991c0.png" media="(min-width: 1280px)" /><source srcset="/fileadmin/_processed_/1/7/csm_1124-102-AI-News-Nanostructured-Surface-Enhances-Spectroscopy-Signals_In-Article_560a1de9f6.webp" media="(min-width: 1024px)" type="image/webp" /><source srcset="/fileadmin/_processed_/1/7/csm_1124-102-AI-News-Nanostructured-Surface-Enhances-Spectroscopy-Signals_In-Article_b009185f3e.png" media="(min-width: 1024px)" /><source srcset="/fileadmin/_processed_/1/7/csm_1124-102-AI-News-Nanostructured-Surface-Enhances-Spectroscopy-Signals_In-Article_7a9cff66c0.webp" media="(min-width: 835px)" type="image/webp" /><source srcset="/fileadmin/_processed_/1/7/csm_1124-102-AI-News-Nanostructured-Surface-Enhances-Spectroscopy-Signals_In-Article_789cd40c35.png" media="(min-width: 835px)" /><source srcset="/fileadmin/_processed_/1/7/csm_1124-102-AI-News-Nanostructured-Surface-Enhances-Spectroscopy-Signals_In-Article_96f7cdd604.webp" media="(min-width: 768px)" type="image/webp" /><source srcset="/fileadmin/_processed_/1/7/csm_1124-102-AI-News-Nanostructured-Surface-Enhances-Spectroscopy-Signals_In-Article_0ea4548f4f.png" media="(min-width: 768px)" /><source srcset="/fileadmin/_processed_/1/7/csm_1124-102-AI-News-Nanostructured-Surface-Enhances-Spectroscopy-Signals_In-Article_e1b65815e2.webp" media="(min-width: 567px)" type="image/webp" /><source srcset="/fileadmin/_processed_/1/7/csm_1124-102-AI-News-Nanostructured-Surface-Enhances-Spectroscopy-Signals_In-Article_ddab3132f5.png" media="(min-width: 567px)" /><source srcset="/fileadmin/_processed_/1/7/csm_1124-102-AI-News-Nanostructured-Surface-Enhances-Spectroscopy-Signals_In-Article_12a1c4f407.webp" media="(min-width: 415px)" type="image/webp" /><source srcset="/fileadmin/_processed_/1/7/csm_1124-102-AI-News-Nanostructured-Surface-Enhances-Spectroscopy-Signals_In-Article_89b478650c.png" media="(min-width: 415px)" /><source srcset="/fileadmin/_processed_/1/7/csm_1124-102-AI-News-Nanostructured-Surface-Enhances-Spectroscopy-Signals_In-Article_de1fb2b25d.webp" type="image/webp" /><img class="b_textmedia__image" src="/fileadmin/_processed_/1/7/csm_1124-102-AI-News-Nanostructured-Surface-Enhances-Spectroscopy-Signals_In-Article_95a428181b.png" width="374" height="214" loading="lazy" alt="" /></picture><figcaption class="b_textmedia__figcaption"><p class="b_rte__bodytext">Highly sensitive molecular detection with chemical stability and mechanical robustness through long-range molecule-plasmon interactions.</p><p>Credit: Takeo Minamikawa, Reiko Sakaguchi, Yoshinori Harada, Hiroki Tanioka, Sota Inoue, Hideharu Hase, Yasuo Mori, Tetsuro Takamatsu, Yu Yamasaki, Yukihiro Morimoto, Masahiro Kawasaki, and Mitsuo Kawasaki</p></figcaption></figure></div><div class="b_clearfix"></div> <p class="b_rte__bodytext">Researchers have <a href="https://www.nature.com/articles/s41377-024-01655-3" target="_blank" rel="noreferrer"><u>developed a nanostructured surface</u></a> that enables long-range signal enhancement for fluorescence and Raman spectroscopy, potentially enabling highly sensitive, non-invasive biosensing and molecular analyses.</p><p class="b_rte__bodytext">The new technique, developed by a team of researchers at Osaka University led by Takeo Minamikawa, combines a column-structured silica (CSS) layer with silver nanoislands (AgNIs). The CSS layer, over 100 nm thick, physically separates the AgNIs from analytes, preventing mutual degradation while maintaining significant signal amplification.</p><p class="b_rte__bodytext">In testing, the device – dubbed a remote plasmonic-like enhancement (RPE) plate – achieved Raman signal enhancement up to 107 times and fluorescence increases up to 102 times compared with traditional methods.</p><div class="b_clearfix"></div><div id='ad-slot-71' class="b_ad"><ga-ad code="71"></ga-ad></div><div id='ad-slot-72' class="b_ad"><ga-ad code="72"></ga-ad></div><div id='ad-slot-51' class="b_ad"><ga-ad code="51"></ga-ad></div> <p class="b_rte__bodytext">The fabrication process begins with AgNIs deposited on glass through sputtering, followed by a CSS layer to shield the AgNIs. A gold(I)/halide treatment optimizes the plasmonic response, and testing – using energy-dispersive X-ray spectroscopy (EDS) and scanning electron microscopy (SEM) – confirmed that analytes remain isolated on the silica surface.</p><p class="b_rte__bodytext">"We demonstrated that the range of influence of plasmons in metals can exceed 100 nanometers, far beyond what conventional theory predicted," Minamikawa explained, <a href="https://www.eurekalert.org/news-releases/1064184" target="_blank" rel="noreferrer"><u>in a press release.</u></a></p><div class="b_clearfix"></div> <p class="b_rte__bodytext">The team validated the technology through two key applications. In biosensing, enhanced fluorescence signals revealed detailed Ca²⁺ signaling in live HeLa cells with minimal disruption. 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