Photochromism and optical property of gold nanoparticles covered with low-polydispersity diarylethene polymers

被引：46
作者：
Nishi, Hiroyasu
Kobatake, Seiya [1 ]
机构：
[1] Osaka City Univ, Grad Sch Engn, Dept Appl Chem, Sumiyoshi Ku, Osaka 5588585, Japan
来源：
MACROMOLECULES | 2008年 / 41卷 / 11期
关键词：
D O I：
10.1021/ma702882t
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Gold nanoparticles covered with photochromic diarylethene polymers or block copolymers with styrene were prepared according to Brust's method. These nanoparticles expressed a bright red color because of their surface plasmon resonance absorption, and exhibited reversible photochromism upon alternate irradiation with ultraviolet and visible light in the solid state as well as in solution. The photocyclization reactivity of the diarylethenes around the gold nanoparticles decreased by shortening the distance between the surface of the gold nanoparticles and the diarylethene chromophore. Some effects of the gold nanoparticles on the optical properties of the diarylethene chromophores were evaluated by comparison of the difference spectra between the UV-visible absorption spectra in the photostationary state and in the initial state under various conditions. The effect was found to appear as a bathochromic shift in the absorption maximum of the diarylethene closed-ring form, which is related to the local electric field generated by the surface plasmon resonance of the gold nanoparticles.
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页码：3995 / 4002
页数：8
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