期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 221, 期 2-3, 页码 204-208出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2011.02.015
关键词
Gold nanorods; Localized surface plasmon resonance; Sensor; Avidin; Extinction spectrum of metal nanoparticles
资金
- Ministry of Education, Culture. Sports, Science and Technology of the Japanese Government [470]
- Grants-in-Aid for Scientific Research [22350037] Funding Source: KAKEN
Gold nanorods (NRs) wrapped with poly(styrene sulfonate) were fixed on glass or indium tin oxide (ITO) substrates that had been modified with polycationic polymer or 3-aminopropyltrimethoxysilane layers. The spectral properties of the NRs were affected by the refractive indices of the substrates and their surface conditions. Surface modification with poly(styrene sulfonate) and avidin molecules shifted the longitudinal surface plasmon (SP) bands to longer wavelength when the substrates were placed in air. In water and a buffered solution, red shifts of the SP bands were also observed, but the shift shifts were not as large as that in the air. It was found that refractive indices around the polymer-wrapped NRs were sensitive to the adsorption of organic molecules even in the aqueous media. (C) 2011 Elsevier B.V. All rights reserved.
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