Controllable Preparation of Plasmonic Gold Nanostars for Enhanced Photothermal and SERS Effects |
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Authors: | YU Xinyue ZHONG Yao SUN Yu CHEN Yanwei |
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Institution: | Key Laboratory of UV-Emitting Materials and Technology of Ministry of Education, National Demonstration Center for Experimental Physics Education, School of Physics, Northeast Normal University, Changchun 130024, P. R. China |
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Abstract: | Gold nanostars(Au NSs) are asymmetric anisotropic nanomaterials with sharp edge structure. As a promising branched nanomaterial, Au NS has excellent plasmonic absorption and scattering properties. In order to tune the plasmonic photothermal and surface-enhanced Raman scattering(SERS) activity of Au NSs to obtain the desired characteristics, the effects of reagents on the local surface plasmon resonance(LSPR) bands of Au NSs were studied and the morphology and size were regulated. Nanoparticles with different sharp edges were synthesized to make their local plasmon resonance mode tunable in the visible and near-infrared region. The effects of the number and sharpness of different tips under the control of AgNO3 on the photothermal response of Au NSs and the SERS activity and their mechanism were discussed in detail. The results show that as the length of the branch tip becomes longer and the sharpness increases, the plasmonic photothermal effect of Au NSs is strengthened, and the photothermal conversion efficiency is the highest up to 40% when the length of Au NSs is the longest. Au NSs with high SERS activity are used for the Raman detection substrate. Based on this property, the quantitative detection of the pesticide thiram is achieved. |
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Keywords: | Gold nanostar Controlled growth Photothermal effect Surface-enhanced Raman scattering(SERS) activity |
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