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23 April 2010 Metal-coated silicon nanopillars with large Raman enhancement for explosives detection
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In this paper we present a quick and easy method for producing relatively large areas of nanostructured substrate that enhances the Raman effect. Standard semiconductor processing techniques are used, hence it is possible to narrowly control the parameters of the fabrication process to create free standing silicon nanopillars with controlled aspect ratios and spacing. The silicon nanopillars are coated by thin films of silver and/or gold to create Raman active surfaces. Surface enhanced Raman scattering (SERS) spectroscopy has numerous applications in chemical sensing, with high sensitivity and fast analysis speed seen as the main advantages. We show how these novel substrates can be used in an explosives sensor. Under the framework of the Xsense project at the Technical University of Denmark (DTU) which combines four independent sensing techniques, these SERS substrates coupled with commercially available microspectrometers will be included in handheld explosives detectors with applications in homeland security and landmine clearance.
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Michael Stenbæk Schmidt and Anja Boisen "Metal-coated silicon nanopillars with large Raman enhancement for explosives detection", Proc. SPIE 7673, Advanced Environmental, Chemical, and Biological Sensing Technologies VII, 767303 (23 April 2010);

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