Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (4): 20220636.doi: 10.7503/cjcu20220636

• Physical Chemistry • Previous Articles     Next Articles

Preparation and Catalytic Performance of Surface-covered AuNPs@PNIPAM Composite Particles

YAN Yutian, WU Si, CHANG Kangkang, XIA Yuzheng, CHEN Xiaonong, SHI Shuxian()   

  1. College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China
  • Received:2022-09-24 Online:2023-04-10 Published:2022-12-02
  • Contact: SHI Shuxian E-mail:shisx@mail.buct.edu.cn
  • Supported by:
    the Joint Project of Biomedical Translational Engineering Research Center of BUCT-CJFH(BRC-BC), China(XK2020-13)

Abstract:

Gold nanoparticles(AuNPs) with high surface energy are easy to agglomerate in water, which restricts their applications. In this study, poly(N-isopropyl acrylamide)(PNIPAM) microgel and AuNPs were combined by electrostatic interaction through physical blending method inorder to cause negative citrate-stabilized AuNPs absorbed on the surface of positive PNIPAM microgels. The prepared surface-covered AuNPs@PNIPAM particles not only have excellent dispersion stability, but also exhibit a temperature-dependent colorimetric property, showing a reversible change of “red→purple→red” during the temperature change of 25 ℃→50 ℃→25 ℃. In addition, the p-nitrophenol(4-NP) reduction reaction was used as the simulated catalytic reaction to examine the catalytic performance of AuNPs@PNIPAM. The results showed that the catalytic performance of AuNPs@PNIPAM first decreased and then increased with temperature. Compared to similar materials reported in the literature, the AuNPs@PNIPAM showed both temperature-colorimetric properties and catalytic performance.

Key words: Poly(N-isopropyl acrylamide) microgel, Gold nanopartiocles, Thermo-responsive property, Catalytic performance

CLC Number: 

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