Journal
NANOTECHNOLOGY
Volume 33, Issue 16, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6528/ac487b
Keywords
poly(N-isopropylacrylamide); gold nanoparticles; reversible regulation; 4-nitrophenol; host-guest interaction
Funding
- National Natural Science Foundation of China [22090050, 21874121]
- National Key R&D Program of China [2021YFA1200403, 2018YFE0206900]
- Joint NSFC-ISF Research Grant Program [22161142020]
- Natural Science Foundation of Hubei Province [2020CFA037]
- Zhejiang Provincial Natural Science Foundation of China [LD21B050001]
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Poly(N-isopropylacrylamide)-anchored gold nanoparticles were prepared through host-guest interaction, allowing reversible regulation of catalytic activity by controlling temperature and light irradiation.
Regulating catalytic activity plays an important role in further optimizing and developing multifunctional catalysts with high selectivity and high activity. Reversible dual regulation of catalytic activity has always been a challenging task. Here, we prepared poly(N-isopropylacrylamide)-anchored gold nanoparticles (AuNP@CDs-Azo-PNIPAM) through host-guest interaction of cyclodextrin capped gold nanoparticles (AuNP@CDs) and azobenzene-terminated poly(N-isopropylacrylamide) (Azo-PNIPAM). Azo-PNIPAM as thermal and light responsive ligand allows reversible dual regulation of catalytic activity. When the temperature is higher than the lowest critical solution temperature, the PNIPAM chain shrinks rapidly, increasing the steric hindrance around AuNPs and reducing the catalytic activity. Under ultraviolet light irradiation, cis-azobenzene disassembles from cyclodextrin and the number of surface active sites of AuNPs increases, which improves the catalytic activity. The reaction rate of UV irradiation is almost 1.3 times that of visible light irradiation. This work provides a simple and effective strategy for the construction of reversible catalysts.
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