Humidity‐Responsive Single‐Nanoparticle‐Layer Plasmonic Films |
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| Authors: | Jianlei Shen Binquan Luan Hao Pei Zaixing Yang Xiaolei Zuo Gang Liu Jiye Shi Lihua Wang Ruhong Zhou Wenlong Cheng Chunhai Fan |
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| Affiliation: | 1. Division of Physical Biology & Bioimaging Center, Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China;2. IBM Thomas J. Watson Research Center, NY, USA;3. Institute of Quantitative Biology and Medicine, SRMP and RAD‐X, Collaborative Innovation Center of Radiation Medicine of Jiangshu Higher Education Institution, Soochow University, Jiangshu, China;4. Department of Chemistry, Columbia University, NY, USA;5. Department of Chemical Engineering, Monash University, Clayton, VIC, Australia |
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| Abstract: | 2D materials possess many interesting properties, and have shown great application potentials. In this work, the development of humidity‐responsive, 2D plasmonic nanostructures with switchable chromogenic properties upon wetting–dewetting transitions is reported. By exploiting DNA hybridization‐directed anchoring of gold nanoparticles (AuNPs) on substrates, a series of single‐nanoparticle‐layer (SNL) plasmonic films is fabricated. Due to the collective plasmonic responses in SNL, these ultrathin 2D films display rapid and reversible red‐blue color change upon the wetting–dewetting transition, suggesting that hydration‐induced microscopic plasmonic coupling between AuNPs is replicated in the macroscopic, centimeter‐scale films. It is also found that hydration finely tunes the electric field distribution between AuNPs in the SNL film, based on which responsive surface‐enhanced Raman scattering substrates with spatially homogeneous hot spots are developed. Thus it is expected that DNA‐mediated 2D SNL structures open new avenues for designing miniaturized plasmonic nanodevices with various applications. |
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| Keywords: | chromogenic films DNA gold nanoparticles plasmon coupling single nanoparticle layers |
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