| 摘要(英) |
In this study, we fabricated surface-enhanced Raman scattering (SERS) substrates, using Au nanoparticles and InGaN nanostructured quantum wells. The nitride structure was grown by metal-organic chemical vapor deposition (MOCVD). We used the SERS substrate to detect glucose at varied concentrations, aiming to obtain strong and stable Raman signals. In order to enhance the sensitivity, the fabrication optimization focused on the control of Au-film thickness. The Au nanoparticles were attained by annealing an Au thin film. Since SERS signals of glucose come from the localized surface plasmon resonance (LSPR) effect induced by Au nanoparticles, Au-film thickness and the annealing condition should be prudently selected to form the nanoparticles with proper dimension/density, so that the LSPR effect can be maximized. After a systematic characterization, it is found the SERS substrate attained with a 10-nm thick Au film and the annealing at 700 °C for 2 hours can deliver the highest SERS signal of glucose. With this condition, the glucose can be detected at the concentration down to 2 g/L. |
| 參考文獻 |
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