| Summary: | 碩士 === 國立臺灣科技大學 === 材料科學與工程系 === 107 === In this study, Gold nanorods (AuNRs) with different aspect ratios were prepared by seed-mediated growth method combined with different dimensions of nanocarbon materials (graphene oxide, carbon nanotubes, carbon black) for surface-enhanced Raman scattering (SERS). The principle of nanodispersion is to stabilize AuNRs with cetyltrimethylammonium bromide (CTAB), and the surface of AuNRs is positively charged, which will adsorb on negatively charged nanocarbon materials to form AuNRs/nanocarbon materials due to electrostatic attraction. This nano-mixed material has good optical penetration and can improve the contact area with the detector. It can be used as a high-sensitivity surface-enhanced Raman scattering substrate. We compared the signal differences between AuNRs and nanocarbon materials of different dimensions on SERS. The experimental results can be confirmed by Ultraviolet-visible spectroscopy (UV-Vis) and Transmission Electron Microscope (TEM) to confirm the stable and uniform adsorption of AuNRs on nanocarbon materials. The results on SERS show the AuNRs/GO complex has the best enhancement signal. Since GO is a two-dimensional nanomaterial with a thickness of less than 5 nm, the AuNRs adsorbed on GO can produce a good 3D hot junction effect. In the SERS test, the enhancement factor (EF) for the dye molecule Rhodamine 6G (R6G) is 1×107, and the limit of detection is 10-8M, which achieves a good enhancement effect. Further used on D-SERS, since D-SERS is a process for detecting samples from wet to dry, a large number of 3D hot spots are spontaneously formed during the evaporation of the solvent, thereby greatly improving the SERS signal. The experimental results show that the AuNRs/GO complex has the best signal enhancement effect on D-SERS. The enhancement factor (EF) for the dye molecule Rhodamine 6G (R6G) is 1.1×108, and the detection limit is 10-9M. Therefore, the AuNRs/GO complex acts as SERS's molecular sensing components are extremely sensitive and are ideal for rapid detection of single molecules in water and the environment.
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