AuNPs@mesoSiO2 composites for SERS detection of DTNB molecule

被引：37

作者：

Lin, Chi-Chang ^{[1
]}

Chang, Chia-Wen ^{[1
]}

机构：

[1] Tunghai Univ, Dept Chem & Mat Engn, Taichung 40704, Taiwan

来源：

BIOSENSORS & BIOELECTRONICS | 2014年 / 51卷

关键词：

Raman; SERS; Nanoparticles; Mesoporous silica; Gold nanoparticles; DTNB; ENHANCED RAMAN-SCATTERING; SILVER ELECTRODE; MESOPOROUS SILICA; SURFACE; SPECTROSCOPY; NANOPARTICLES; TEMPLATE; IDENTIFICATION; DEPOSITION; SUBSTRATE;

D O I：

10.1016/j.bios.2013.07.065

中图分类号：

Q6 [生物物理学];

学科分类号：

071011 ;

摘要：

A surface enhanced Raman spectroscopy (SERS) substrate made of gold nanoparticles-embedded mesoporous silica (AuNPs@mesoSiO(2)) varying with size and gold concentrations was applied for SERS applications. In this study, the AuNPs@mesoSiO(2) substrate produced notable intensity and more distinguishable peaks when compared with the spectra collected directly from an Au/Cr-coated substrate with regard to the detection of a lower concentration of chemicals or environmental contamination. Both aqueous and dried coffee rings of 5-5'-Dithio-bis (2-nitrobenzoic acid) (DTNB) solutions were examined. SERS spectra obtained from the substrate showed more fingerprint peaks with significant enhancement on the spectra signals. The correlation between the SERS signal and the DTNB concentration was found to be linear within a range of 10(-2) to 10(-12) M. SERS enhancement between 25 and 8 times greater can be achieved for DTNB detection using AuNP5@mesoSiO(2) compared with the normal Raman spectra obtained from the aqueous solution and the contact line of the dried coffee ring, respectively. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：297 / 303

页数：7

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