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Spectral dependence of gold nanorods on the optical properties of substrates and adsorption of polypeptides

Paper ID Volume ID Publish Year Pages File Format Full-Text
26728 43973 2011 5 PDF Available
Title
Spectral dependence of gold nanorods on the optical properties of substrates and adsorption of polypeptides
Abstract

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.

► Gold nanorods are fixed on substrates and examined their SP bands. ► RSP bands are affected by refractive indices of the substrates and the surface conditions. ► Deposition of polymerson the substrates shifts the SP bands to longer wavelength. ► Refractive index changes at the interface are sensitively picked up by the gold nanorods.

Keywords
Gold nanorods; Localized surface plasmon resonance; Sensor; Avidin; Extinction spectrum of metal nanoparticles
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Spectral dependence of gold nanorods on the optical properties of substrates and adsorption of polypeptides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 221, Issues 2–3, 25 June 2011, Pages 204–208
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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Price after discount Only $4.95
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