Tailoring Size and Coverage Density of Silver Nanoparticles on Monodispersed Polymer Spheres as Highly Sensitive SERS Substrates |
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| Authors: | Yougen Hu Tao Zhao Dr Pengli Zhu Yu Zhu Xianwen Liang Prof Rong Sun Prof Ching‐Ping Wong |
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| Institution: | 1. Guangdong Provincial Key Laboratory of Materials for High Density Electronic Packing, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, P. R. China;2. Shenzhen College of Advanced Technology, University of Chinese Academy of Sciences, Shenzhen, Guangdong, P. R. China;3. Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, NT, Hong Kong, P. R. China;4. Nano Science and Technology Institute, University of Sciences and Technology of China, Suzhou, Jiangsu, P. R. China;5. School of Materials Sciences and Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA |
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| Abstract: | Silver nanoparticles (AgNPs) were deposited onto the monodispersed carboxylic polystyrene (CPS) spheres by an improved in situ reduction method. The size and coverage density of the AgNPs on the surface of CPS spheres could be easily tailored by tuning the concentrations of carboxylic functional groups and silver precursor. The morphologies and structures of the resulting CPS/Ag hybrid particles were studied by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X‐ray diffraction (XRD), UV‐Vis‐NIR spectrometer and X‐ray photoelectron spectroscopy (XPS), etc. The surface enhanced Raman scattering (SERS) performances of the resulting uniform CPS/Ag hybrid particles were investigated using 4‐aminobenzenethiol (4‐ABT) as the probe molecule. The optimized CPS/Ag hybrid particles show high enhancement factor (EF) of 2.71×107, low limit of detection (LOD) of 10?10 m and good reproducibility with relative standard deviation (RSD) of 9.64 %. The good SERS improvement properties demonstrate these hybrid particles could be employed as simple and effective substrates in the SERS spectroscopy. |
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| Keywords: | in situ reduction polystyrene spheres Raman spectroscopy surface enhanced Raman scattering (SERS) silver nanoparticles |
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