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Updated: Jan 22, 2026

Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation
Published on: August 15, 2019
Probing hidden colloidal transitions with the assistance of surface plasmons
Fangfang Deng1, Yunxia Wang1, Xiaolin Lu1
1Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, China. t.ding@whu.edu.cn.
Abstract:
Actuating plasmonic nanoparticles with responsive hydrogels has led to many useful applications but an understanding of how exactly the assembly and disassembly happen remains ambiguous. Conventional views about this system mainly recognize this reversible process as a bi-switch between dispersed and aggregated states. However, in this paper, a hidden vesicle intermediate is revealed by probing changes in plasmon resonances with temperature. The critical factor that influences such a vesicle state originates from the different aggregation modes between polymers and Au NPs. Our theoretical model, along with experimental evidence, further supports this mechanism. This new insight not only provides a kinetic means to modify self-assemblies by engineering the polymer aggregation rate but it also has great implications for the dynamics of colloid/polymer interactions in general.
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