Switching plasmon coupling through the formation of dimers from polyaniline-coated gold nanospheres

Nina Jiang; Qifeng Ruan; Feng Qin; Jianfang Wang; Hai-Qing Lin

doi:10.1039/C5NR02619A

Switching plasmon coupling through the formation of dimers from polyaniline-coated gold nanospheres

Nina Jiang,^a Qifeng Ruan,^a Feng Qin,^a Jianfang Wang*^a^b and Hai-Qing Lin^c

Author affiliations

* Corresponding authors

^a Department of Physics, The Chinese University of Hong Kong, Shatin, China
E-mail: jfwang@phy.cuhk.edu.hk

^b Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen 518057, China

^c Beijing Computational Science Research Center, Beijing 100084, China

Abstract

Active modulation of the plasmon coupling in homodimers of polyaniline (PANI)-coated Au nanospheres is achieved by changing the proton-doping state of the PANI shell. Such a PANI-enabled modulation of the plasmon coupling in the dimers gives rise to remarkable spectral shifts, which show an exponential dependence on the interparticle gap distance. For the dimer with a 10 nm PANI shell thickness and a 0.5 nm gap distance, the shift of the stronger scattering peak in response to the active modulation reaches 231 nm. Electrodynamic simulations reveal that the shift of the dipolar bonding plasmon mode dominates the position variation of the stronger scattering peak for the dimers with different gap distances. Moreover, the quadrupolar bonding plasmon mode can be turned on and off by controlling the proton-doping state of the dimers with gap distances of less than ∼3 nm. These results are of high importance for fundamentally understanding the sensitivity of coupled plasmon resonance modes to the dielectric environment, as well as for designing active plasmonic devices with high modulation performances.

Supplementary files

Publication details

The article was received on 22 Apr 2015, accepted on 08 Jun 2015 and first published on 15 Jun 2015

Article type: Paper

DOI: 10.1039/C5NR02619A

Citation: Nanoscale, 2015,7, 12516-12526

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Switching plasmon coupling through the formation of dimers from polyaniline-coated gold nanospheres

N. Jiang, Q. Ruan, F. Qin, J. Wang and H. Lin, Nanoscale, 2015, 7, 12516
DOI: 10.1039/C5NR02619A
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Nanoscale

Switching plasmon coupling through the formation of dimers from polyaniline-coated gold nanospheres

Abstract

Supplementary files

Publication details

Switching plasmon coupling through the formation of dimers from polyaniline-coated gold nanospheres

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