Tailoring the SERS Enhancement Mechanisms of Silver Nanowire Langmuir-Blodgett Films via Galvanic Replacement Reaction

被引：25

作者：

Netzer, Nathan L. ^{[1
]}

Tanaka, Zuki ^{[2
]}

Chen, Bin ^{[2
]}

Jiang, Chaoyang ^{[1
]}

机构：

[1] Univ S Dakota, Dept Chem, Vermillion, SD 57069 USA

[2] NASA, Adv Studies Labs, Ames Res Ctr, Moffett Field, CA 94035 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2013年 / 117卷 / 31期

基金：

美国国家科学基金会;

关键词：

RAMAN-SCATTERING; SINGLE-MOLECULE; P-AMINOTHIOPHENOL; SURFACE; NANOSTRUCTURES; SPECTROSCOPY; AU; IDENTIFICATION; NANOPARTICLES; MONOLAYERS;

D O I：

10.1021/jp405796b

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report a new facile route for preparing surface-enhanced Raman scattering (SEAS) substrates with tailored enhancement mechanisms. Silver nanowires were assembled using the Langmuir-Blodgett (LB) technique and further processed via galvanic replacement reactions (GRRs). The GRRs provided an efficient method to decrease the spectral noise caused by the capping agent polyvinylpyrrolidone. A decrease in noise along with the addition of gold nanostructures to the system revealed Raman signals from nonfluorescent molecules associated with a charge-transfer mechanism. The GRR LB substrates exhibited ultrasensitive SERS ability with a detection limit as low as 8 nM using 4-aminothiophenol, partially due to the strong chemical binding between the SERS substrates and probe molecules. Furthermore, the GRRs provide a facile route in tailoring SERS substrates to target molecules in a controlled manner.

引用

页码：16187 / 16194

页数：8