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ID 113994
Author
Enders, Matthias University of Tokushima|RheinMain University of Applied Sciences
Mukai, Shinya University of Tokushima
Uwada, Takayuki Josai University
Content Type
Journal Article
Description
A temperature gradient can induce solutes to migrate from a hot to a cold region, and vice versa, in solution. This process, termed thermophoresis, has been applied to manipulate, transport, and separate various macromolecules and colloids by exploiting a microscale temperature gradient. Here we describe using a single gold nanoparticle (AuNP) as an efficient nanoscale heating source to promote thermophoresis. Moreover, on introducing a substrate with high thermal conductivity such as sapphire, a strong local temperature gradient can be shaped in the medium near the AuNP under continuous wave laser illumination. We observed molecules such as polyethylene glycol and sodium dodecyl sulfate being transported toward the AuNP and attaching to its surface, forming a gold core–organic shell structure within several tens of seconds of illumination. Spectroscopically, because of the gradual increasing encapsulation, progressive red shifts with enhanced scattering intensities were seen for the localized surface plasmon resonance bands of the AuNP with increasing cycles of illumination. Post-mortem scanning electron microscopy provided direct evidence of shell formation. Our technique is relevant to nanofabrication based upon optical heating at the nanometer scale.
Journal Title
The Journal of Physical Chemistry C
ISSN
19327447
19327455
NCID
AA1217589X
AA12192210
Publisher
ACS Publications
Volume
120
Issue
12
Start Page
6723
End Page
6732
Published Date
2016-03-07
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.5b11762.
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DOI (Published Version)
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language
eng
TextVersion
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departments
Science and Technology