✦ LIBER ✦

Light-Tunable Thermosensitivity of Polymer-Coated Gold Nanoparticles Achieved by Light-Controlled Molecular Recognition

✍ Scribed by Chunhua Luo; Qiujing Dong; Zhaohui Zheng; Xiaobin Ding; Yuxing Peng

Publisher: John Wiley and Sons
Year: 2011
Tongue: English
Weight: 575 KB
Volume: 212
Category: Article
ISSN: 1022-1352
DOI: 10.1002/macp.201100046

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✦ Synopsis

Abstract

Thermo‐ and photosensitive gold nanoparticles (AuNPs) coated with an azobenzene‐contained P(DMA‐PAPA‐MAEL) copolymer are prepared by ligand exchange reactions. The photoisomerization of azobenzene moiety on the surface of P(DMA‐PAPA‐MAEL)‐coated AuNPs is detected by means of UV‐Vis spectroscopy with the presence or absence of free α‐cyclodextrin. When subjected to visible and UV light irradiation alternately, P(DMA‐PAPA‐MAEL)‐coated AuNPs in the presence of free α‐CD display a light‐tunable lower critical solution temperature through light‐controlled molecular recognition between the azobenzene moiety on the surface of AuNPs and free α‐CD. magnified image

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## Abstract Thermosensitive poly(__N__‐isopropylacrylamide) (PNIPAm)‐coated gold nanoparticles (AuNPs) were prepared by self‐assembly of the azobenzene‐terminated PNIPAm on the surface of the __α__‐cyclodextrin (__α__‐CD)‐capped AuNPs via the host–guest molecular recognition between __α__‐CD and az