自愈水凝胶
表面等离子共振
材料科学
银纳米粒子
纳米技术
纳米颗粒
化学工程
光化学
高分子化学
化学
工程类
作者
Fushun Wang,Anyang Cui,Zhigao Hu,Lidong Zhang
标识
DOI:10.1002/adom.202101505
摘要
Abstract Hydrogels remain challenging for the reversible high‐resolution coloration/discoloration in response to external stimuli. Herein, a photogated coordination‐switching mechanism is proposed to alter the localized surface plasmon resonance of silver nanoparticles (AgNPs) inside a hydrogel network, which enables the reversible color change. The hydrogel is synthesized by free‐radical crosslinking of N,N' ‐bisacrylylcystamine (BACA), sodium p ‐styrenesulfonate (NASS), and acrylamide (Am) in the presence of AgNPs. Upon light irradiation at λ = 400 nm (300 mW cm −2 ), the AgNPs selectively coordinate with the disulfide bond of BACA to result in a reddish‐brown hydrogel in 30 s. In dark condition, this coordinating effect is replaced by the sulfonate of NASS and AgNPs, which brings the hydrogel into gray white. Such a photogated coordination‐switching mechanism is a physical process that enables the coloration/discoloration cycles without apparent reduction in the resolution. By means of a high‐precision mask, it allows writing, storing, and erasing of complicated information at the hydrogel surface, showing a great potential in informatics, cryptology, and security areas.
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