期刊
LANGMUIR
卷 24, 期 16, 页码 8976-8980出版社
AMER CHEMICAL SOC
DOI: 10.1021/la801068k
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资金
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0756461] Funding Source: National Science Foundation
Hierarchically organized single-nanoparticle structures synthesized in this work consisted of a 200 nm silica core and a pH-responsive poly (2-vinylpyridine) shell decorated with 15 nm gold nanoparticles. pH changes in the range of 3-6 back and forth results in a swelling-shrinking polymer brush shell and, thus, in the tuning distance between noble nanoparticles. A change in the interparticle distance is accompanied by a very pronounced shift in the maximum wavelength of the surface plasmon absorption peak. The dispersion of the resulting composite nanoparticles reversibly changed color from red to purple-blue as the pH changed from 2.5 to 6. Such hierarchically assembled nanostructures can be used as free-standing single-particle sensors in various miniaturized analytical systems.
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