Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (8): 2381.doi: 10.7503/cjcu20210005

• Inorganic Chemistry • Previous Articles     Next Articles

Controllable Growth of Silver Nanoparticles on TiO2 Tetragonal Prism Nanarrays and Its SERS Effect

CHEN Shaoyun1, ZHANG Xingying1, LIU Ben1, TIAN Du1, LI Qi1, CHEN Fang1, HU Chenglong1(), CHEN Jian2   

  1. 1.Key Laboratory of Optoelectronic Chemical Materials and Devices,Ministry of Education,School of Chemical and Environmental Engineering,Jianghan University,Wuhan 430056,China
    2.Instrumental Analysis and Research Center,Sun Yat?sen University,Guangzhou 510275,China
  • Received:2021-01-04 Online:2021-08-10 Published:2021-08-05
  • Contact: HU Chenglong E-mail:ceshcl@jhun.edu.cn
  • Supported by:
    Wuhan Municipal Science and Technology Bureau, China(2019010701011384);the National Natural Science Foundation of China(51973244)

Abstract:

The TiO2 tetragonal prism array structure was deposited on the conductive surface of the conductive glass FTO by hydrothermal method. The silver nanoparticles(AgNPs) grew on the TiO2 tetragonal prism by polyvinylpyrrolidone(PVP) reduced Tollens reagent to form TiO2@AgNPs-PVP micro-nano structure, while the silver nanoparticles grew on the TiO2 tetragonal prismby trisodium citrate(TSC) reduced silver nitrate to form TiO2@AgNPs-TSC micro-nano structure. The as-prepared micro-nano structures could be used as the substrate for surface enhanced Raman scattering(SERS). The results showed that the size and distribution of Ag NPs nanoparticles on the TiO2 tetragonal prism array could be adjusted by the concentration of Tollens reagent and the reaction time of TSC to optimize the SERS substrate. The detection limits of the optimized TiO2@AgNPs-PVP substrate for rhodamine 6G(R6G) and melamine are 10-12 mol/L and 0.01 mg/mL, respectively. The optimized TiO2@AgNPs-TSC micro-nano structure for R6G and melamine are 10-10 mol/L and 0.01 mg/mL, respectively. In addition, the SERS activity and recyclability of TiO2@AgNPs-PVP and TiO2@AgNPs-TSC substrates were closely related to the types of reducing agents: the PVP coated on Ag nanoparticles could be used as an isolation layer to avoid direct contact with nanoparticles, which could prevent the quenching of electromagnetic field coupling to enhance the SERS activity of the substrate. However, the adsorbed small molecules(such as R6G) could not be cleaned when the TiO2@AgNPs-PVP was used as a recyclable SERS substrate. It was attributed to the fact that the PVP was a water-based polymer with strong hydrophilicity.

Key words: Surface-enhanced Raman scattering(SERS), TiO2 array, Silver nanoparticles, Rhodamine 6G, Melamine

CLC Number: 

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