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Thermo- and photoresponsive reversible changes in localized surface plasmon resonance of gold nanoparticles covered by poly(N-isopropylacrylamide) with photochromic diarylethene end group

Paper ID Volume ID Publish Year Pages File Format Full-Text
26640 43969 2013 9 PDF Available
Title
Thermo- and photoresponsive reversible changes in localized surface plasmon resonance of gold nanoparticles covered by poly(N-isopropylacrylamide) with photochromic diarylethene end group
Abstract

Thermoresponsive poly(N-isopropylacrylamide) (poly(NIPAm)) with a diarylethene (DE) chromophore at the end group (DE–poly(NIPAm)) was synthesized by reversible addition-fragmentation chain transfer polymerization. The resulting polymer has a lower critical solution temperature at 33 °C and exhibits photochromism in water upon photoirradiation. Gold nanoparticles covered with DE–poly(NIPAm) were prepared by malate reduction, followed by the addition of DE–poly(NIPAm) with SH at the ω-end group. The localized surface plasmon resonance band of the gold nanoparticles exhibits a bathochromic shift with heating and photoirradiation. This is ascribed to changes in the refractive index by the shrunken dehydrated state and the photochromic reaction of the DE chromophore with heating and photoirradiation, respectively.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► We prepared gold nanoparticles covered with poly(N-isopropylacrylamide) having a diarylethene chromophore at the end group. ► Diarylethene at the end group of poly(N-isopropylacrylamide) exhibited photochromism. ► The LSPR band of the gold nanoparticle was red-shifted by heating and photoirradiation. ► Photocycloreversion reaction of diarylethene was enhanced at a temperature more than LCST.

Keywords
Gold nanoparticle; Diarylethene; Photochromism; Plasmon
First Page Preview
Thermo- and photoresponsive reversible changes in localized surface plasmon resonance of gold nanoparticles covered by poly(N-isopropylacrylamide) with photochromic diarylethene end group
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 252, 15 January 2013, Pages 37–45
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering