Journal
NANO LETTERS
Volume 22, Issue 3, Pages 1406-1414Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c04969
Keywords
conductive polymers; gold nanodisks; Mie resonance; plasmon switching; polyaniline
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Funding
- Research Grants Council of Hong Kong (NSFC/RGC) [N_CUHK408/18]
- Croucher Foundation through a Croucher Senior Research Fellowship
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In this study, all-state switching of differently sized PANI nanospheres (NSs) and active plasmon switching on PANI-coated Au nanodisks (NDs) were achieved by proton doping/dedoping and electrochemical methods. The study provides a fundamental understanding of the optical properties of PANI and opens up possibilities for developing high-performance dynamic media for active plasmonics.
Polyaniline (PANI), a conductive polymer, is a promising active material for optical switching. In most studies, active switching has so far been realized only between two states, whereas PANI has a total of six states. The optical properties of nanoscale PANI in all six states have remained unclear. Herein we report on all-state switching of the Mie resonance on PANI nanospheres (NSs) and active plasmon switching on PANI-coated Au nanodisks (NDs). All-state switching of differently sized PANI NSs is achieved by proton doping/dedoping and electrochemical methods. Theoretical studies show that the scattering peaks of the individual PANI NSs originate from Mie resonances. All-state switching is further demonstrated on PANI-coated circular Au NDs, where an unprecedentedly large plasmon peak shift of similar to 200 nm is realized. Our study not only provides a fundamental understanding of the optical properties of PANI but also opens the probability for developing high-performance dynamic media for active plasmonics.
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