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Gold Coated Zinc Oxide Nanonecklaces as a SERS Substrate

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Faceted zinc oxide nanonecklace (ZnO NN) arrays were grown on r-plane sapphires along one direction (ZnO [0001] ‖ sapphire [10-11] and ZnO (-12-10) ‖ sapphire (01-12)) using chemical vapor deposition. After coated with 45 nm gold films and annealed at 250 °C for 30 seconds, the coated ZnO NNs exhibit satisfactory and stable surface enhanced Raman scattering (SERS) effects when tested with melamine and other chemicals. The limit of detection of melamine is 10−5 mol/L and the analytical enhancement factor is ∼104, which is competitive to a commercial substrate. This study indicates that gold coated ZnO NN substrates have a great potential as SERS-active substrates in rapid detection of trace amount food contaminants such as melamine and other chemicals.
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Keywords: CHEMICAL VAPOR DEPOSITION (CVD); NANONECKLACES; RAMAN SPECTROSCOPY; SERS SUBSTRATE; SURFACE ENHANCED RAMAN SCATTERING (SERS); ZINC OXIDE

Document Type: Research Article

Publication date: 2011-04-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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