Ag/Au coated carbon nano walls as a substrate for highly-sensitive sers detection
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DYAKONOV, P., , , , , , , DAGESYAN, S., FADEEV, V., EVLASHIN, S.. Ag/Au coated carbon nano walls as a substrate for highly-sensitive sers detection. In: Materials Science and Condensed Matter Physics, Ed. 8-th Edition, 12-16 septembrie 2016, Chişinău. Chişinău: Institutul de Fizică Aplicată, 2016, Editia 8, p. 213. ISBN 978-9975-9787-1-2.
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Materials Science and Condensed Matter Physics
Editia 8, 2016
Conferința "International Conference on Materials Science and Condensed Matter Physics"
8-th Edition, Chişinău, Moldova, 12-16 septembrie 2016

Ag/Au coated carbon nano walls as a substrate for highly-sensitive sers detection


Pag. 213-213

Dyakonov P.1, 2, 1, 2, Dagesyan S.2, Fadeev V.2, Evlashin S.1
 
1 D.V. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University,
2 Lomonosov Moscow State University
 
 
Disponibil în IBN: 31 iulie 2019


Rezumat

Surface Enhanced Raman Spectroscopy(SERS) is a powerful technique of spectral analysis. SERS can be used for single-molecule detection(for example SERS makes detecting of single DNA molecule possible), for trace analysis of medicines, drugs, detection and identification of dyestuffs from old artworks and many more[1].  Basically SERS is being used in every field where basic Raman signal amplification is required. Signal amplification happens because of interaction between plasmons on substrates surface and molecules of analyte dispersed on substrate. Maximum SERS Enhancement Factor (EF) can be as high as 1010 – 1012 [1]. Maximum EF is measured on a specific types of spots on substrates (for example a tip of nano-needle), and u can only measure the signal of molecules that are adsorbed on this hot-spot. However there is no real way to control location of these hot spots or a way to place molecules on it. Average SERS EF is typically as high as 107 – 108 [1]. Average EF gives one knowledge about average amplification of signal from any possible positions on substrates surface.  Substrate choice plays a major role in enhancement of the Raman signal. Good substrates are those that provide the best EF. The best SERS substrates are made of gold and silver, since they have the best plasmon resonance for common SERS excitation wavelengths (400-1000 nm), and so, sustain the best resonance response. It is essential for SERS substrates to have some nano structures on its surface. These objects are important for creating hot-spots, which give the best possible EF.  We developed a new type of composite SERS substrates. Main idea was to use a base material with a high specific surface area and coat it with a thin film of SERS-metal (namely, gold) to meet all the requirements of proper SERS substrate. As a result, substrates with high specific surface area and high surface density of hot-spots were achieved.    Carbon Nano Walls (CNW) were taken as a base material, CNWs show both large surface area and nanoscale objects on surface. Larger surface area increases a potential number of molecules, which provide the SERS signal, and presence of nanostructures promote formation of hot-spots. Earlier our group developed composite substrates using silver film coating. Base material (CNWs) was coated with thin films of silver. These substrates proved to detect SERS signals of 10-7 M R6G solutions [2].    Using the same idea, CNWs were coated with gold films, so golden structures with large suface area were obtained. Au coated substrates show more uniform and dense distribution of hot-sports, thus providing a higher average EF then flat Au/Ag substrates and Ag coated CNWs.