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METAL COATED NANOCRYSTALLINE SILICON AS AN ACTIVE SURFACE ENHANCED RAMAN SPECTROSCOPYSERS SUBSTRATE
METAL COATED NANOCRYSTALLINE SILICON AS AN ACTIVE SURFACE ENHANCED RAMAN SPECTROSCOPYSERS SUBSTRATE
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机译:金属包覆的纳米硅作为活性表面增强拉曼光谱仪的基质
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摘要
The methods and apparatus 300 disclosed herein concern Raman spectroscopy using metal coated nanocrystalline porous silicon substrates 240, 340 . In certain embodiments of the invention, porous silicon substrates 110, 210 may be formed by anodic etching in dilute hydrofluoric acid 150 . A thin coating of a Raman active metal, such as gold or silver, may be coated onto the porous silicon 110, 210 by cathodic electromigration or any known technique. The metal-coated substrate 240, 340 provides an extensive, metal rich environment for SERS, SERRS, hyper-Raman and/or CARS Raman spectroscopy. In certain embodiments of the invention, metal nanoparticles may be added to the metal-coated substrate 240, 340 to further enhance the Raman signals. Raman spectroscopy may be used to detect, identify and/or quantify a wide variety of analytes, using the disclosed methods and apparatus 300.
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