Dual-Responsive Reversible Plasmonic Behavior of Core–Shell Nanostructures with pH-Sensitive and Electroactive Polymer Shells

Jeon, Ju-Won; Zhou, Jing; Geldmeier, Jeffrey A.; Ponder, Jr., James F.; Mahmoud, Mahmoud A.; El-Sayed, Mostafa; Reynolds, John R.; Tsukruk, Vladimir V.

doi:10.1021/acs.chemmater.6b04026

Title: Dual-Responsive Reversible Plasmonic Behavior of Core–Shell Nanostructures with pH-Sensitive and Electroactive Polymer Shells

Journal Article · Tue Sep 27 00:00:00 EDT 2016 · Chemistry of Materials

DOI:https://doi.org/10.1021/acs.chemmater.6b04026· OSTI ID:1534448

Jeon, Ju-Won ^[1]; Zhou, Jing ^[1]; Geldmeier, Jeffrey A. ^[1]; Ponder, Jr., James F. ^[1]; Mahmoud, Mahmoud A. ^[1]; El-Sayed, Mostafa ^[1]; Reynolds, John R. ^[1]; Tsukruk, Vladimir V. ^[1]

Georgia Inst. of Technology, Atlanta, GA (United States)

In this paper, we report novel dual-responsive plasmonic core–shell anisotropic nanostructures composed of gold nanorod (AuNR) and responsive polyaniline (PANI) shells with plasmonic mode appearance reversibly modulated through orthogonal stimuli (i.e., electrical potential and pH change). In this system, the PANI shells provide AuNR cores with three different refractive index environments depending on stimuli (pH and electrical potential). Therefore, no additional secondary responsive component is necessary to induce the dual-responsive properties of AuNR cores. Furthermore, in this study, dual-responsive properties can be realized for nanostructures fixed on substrates, whereas previously reported dual-responsive plasmonic systems can only be controlled in solution. Here, the highest localized surface plasmonic resonance (LSPR) shift of the AuNR cores can be induced by changing both local pH and applying electric potential. Notably, a significant plasmon band shift by 107 nm is realized with only 8 nm thick PANI shell due to the large refractive index change at the gold–polymer interface. A maximum shift of the longitudinal plasmon mode of 149 nm is obtained by applying a modest electrical potential (below ±1 V), a large shift rarely reported in the literature for metal nanostructures. Moreover, our anisotropic core/shell nanostructures exhibit stable and reversible dual-responsive LSPR behavior over 100 cycles without degradation.

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Research Organization:: Georgia Institute of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)

Grant/Contract Number:: SC0002232; FG02-09ER46604

OSTI ID:: 1534448

Journal Information:: Chemistry of Materials, Vol. 28, Issue 20; ISSN 0897-4756

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 42 works

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