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ID 113995
Author
Aibara, Issei University of Tokushima
Chikazawa, Jun-ichi University of Tokushima
Uwada, Takayuki Josai University
Content Type
Journal Article
Description
Optical excitation-induced heating of a single gold nanoparticle potentially offers a high-temperature field confined to the immediate neighborhood of the particle. In this study, we applied darkfield microscopy imaging and Rayleigh scattering spectroscopy to pursue phase separation of aqueous thermoresponsive poly(N-isopropylacrylamide) and poly(vinyl methyl ether) adjacent to a gold nanoparticle that was heated by continuous wave laser illumination. Gold nanoparticles were supported on transparent substrates of glass or sapphire. From the imaging study, we observed that a 1−10-μm microdroplet covering the nanoparticle formed and grew in time scales of seconds to a few tens of seconds. The growth was triggered by the illumination and the droplet collapsed when the laser was blocked. At the same time, we observed scattering spectral changes characterized by a progressive redshift in the localized surface plasmon resonance (LSPR) band and an increasing scattering intensity in wavelengths region shorter than the LSPR band with increasing laser intensity. The scattering spectral changes were interpreted by the encapsulation of the nanoparticle by a polymer-rich droplet with increasing sizes. The present study revealed that thermoresponsive polymers were attracted to a hot gold nanoparticle and formed a microdroplet under illumination with a wavelength near the LSPR. Our findings demonstrate the potential of plasmonic heating to manipulate polymer migration and accumulation, which may find applications in protein crystallization.
Journal Title
The Journal of Physical Chemistry C
ISSN
19327447
19327455
NCID
AA1217589X
AA12192210
Publisher
ACS Publications
Volume
121
Issue
40
Start Page
22496
End Page
22507
Published Date
2017-09-19
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.7b07187.
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DOI (Published Version)
URL ( Publisher's Version )
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language
eng
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departments
Science and Technology