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ID 113993
Author
Aibara, Issei University of Tokushima
Mukai, Shinya University of Tokushima
Content Type
Journal Article
Description
The localized-surface-plasmon resonance (LSPR) of gold nanoparticles (Au NPs) depends sensitively on the environmental refractive index. We found that LSPRs of single Au NPs supported on a transparent substrate can monitor the phase transition/separation of thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) in aqueous solution. Both reversible and irreversible phase separations were observed. Plasmonic-heating-induced redshifts and subsequent cooling-induced recovery were observed on a glass substrate. Besides reversible redshifts at lower laser intensities, permanent redshifts were evident at higher intensities after illumination on a sapphire substrate, which has a much higher thermal conductivity than glass. The permanent redshifts were caused by the formation of a PNIPAM shell around the NP. For this permanent aggregation, temperature shaping around the Au NP by the substrate was found decisive and may find new chemistry applications based on local temperature landscapes. The observed nanofabrication of core–shell particles is one such example.
Journal Title
The Journal of Physical Chemistry C
ISSN
19327447
19327455
NCID
AA1217589X
AA12192210
Publisher
ACS Publications
Volume
120
Issue
31
Start Page
17745
End Page
17752
Published Date
2016-07-11
Rights
This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpcc.6b04265.
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DOI (Published Version)
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FullText File
language
eng
TextVersion
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departments
Science and Technology