期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 45, 页码 16307-16313出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201910116
关键词
films; nanoparticles; plasmonic color-switching; silver; sodium borate
资金
- National Natural Science Foundation of China [21671120, 21701100, 51972199]
- Natural Science Foundation of Shandong Province [ZR2019JQ15]
- U.S. National Science Foundation [CHE-1808788]
The fast and reversible switching of plasmonic color holds great promise for many applications, while its realization has been mainly limited to solution phases, achieving solid-state plasmonic color-switching has remained a significant challenge owing to the lack of strategies in dynamically controlling the nanoparticle separation and their plasmonic coupling. Herein, we report a novel strategy to fabricate plasmonic color-switchable silver nanoparticle (AgNP) films. Using poly(acrylic acid) (PAA) as the capping ligand and sodium borate as the salt, the borate hydrolyzes rapidly in response to moisture and produces OH- ions, which subsequently deprotonate the PAA on AgNPs, change the surface charge, and enable reversible tuning of the plasmonic coupling among adjacent AgNPs to exhibit plasmonic color-switching. Such plasmonic films can be printed as high-resolution invisible patterns, which can be readily revealed with high contrast by exposure to trace amounts of water vapor.
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