Sensing of 2,4-dichlorophenoxyacetic acid by surface-enhanced Raman scattering

被引：9

作者：

Costa, Jean C. S. ^{[1
]}

Cordeiro, Denise S. ^{[1
]}

Sant'Ana, Antonio C. ^{[1
]}

Rossi, Liane M. ^{[1
]}

Santos, Paulo S. ^{[1
]}

Corio, Paola ^{[1
]}

机构：

[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05513970 Sao Paulo, Brazil

来源：

VIBRATIONAL SPECTROSCOPY | 2010年 / 54卷 / 02期

关键词：

2,4-Dichlorophenoxyacetic acid; Nanostructured gold surface; Raman; SERS; Single-molecule; AG NANOPARTICLES; SILVER; SPECTROSCOPY; ADSORPTION; AU;

D O I：

10.1016/j.vibspec.2010.07.009

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Surface-enhanced Raman scattering (SERS) spectra of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) was obtained by employing a bi-layer gold substrate, assembled by the reduction of Au(III) over gold-seeded nanoparticles immobilized on functionalized glass substrates. The SERS signal was linear with the logarithm of the solution concentrations between 1.0 x 10(-7) mol L-1 and 1.0 x 10(-3) mol L-1, indicating that the bi-layer gold substrate affords a significant dynamic range for SERS, providing an excellent analytical response within this concentration range, and revealing the high sensitivity of the gold surface towards such analyte. In addition, using the same gold substrate, a similar calibration curve was obtained for crystal-violet (CV), and it was possible to identify the concentration limit corresponding to the transition from the average SERS to the nonlinear SERS response. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：133 / 136

页数：4

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