Single nanoparticle based optical pH probe

被引：42

作者：

Jensen, Rebecca A. ^{[1
]}

Sherin, Jennifer ^{[1
]}

Emory, Steven R. ^{[1
]}

机构：

[1] Western Washington Univ, Dept Chem, Bellingham, WA 98225 USA

来源：

APPLIED SPECTROSCOPY | 2007年 / 61卷 / 08期

关键词：

surface-enhanced Raman scattering; SERS; core-shell nanoparticles; optical pH probes;

D O I：

10.1366/000370207781540105

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

This paper describes the development of a nanoscale optical pH probe based upon the surface-enhanced Raman scattering (SERS) properties of silica-gold core-shell nanoparticles. In this approach, a thin layer of gold is deposited onto a core of silica to form a metallic nanoshell with surface plasmon modes in the red-to-near-infrared spectral region. The surface of the nanoshell is functionalized with a pH-sensitive SERS reporter molecule, 4-mercaptopyridine (4-MPy). The SERS spectra of 4-MPy is shown to be sensitive to the pH of the surrounding media within the range of 3 to 7. In addition, it is shown that individual silica-gold core-shell nanoparticles yield more reliable SERS spectra than aggregates of core-shell nanoparticles.

引用

页码：832 / 838

页数：7

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