Localized surface plasmon resonance (LSPR) and surface-enhanced Raman scattering (SERS) studies of 4-aminothiophenol adsorption on gold nanorods

被引：92

作者：

Gabudean, A. M. ^{[1
,2
]}

Biro, D. ^{[3
]}

Astilean, S. ^{[1
,2
]}

机构：

[1] Univ Babes Bolyai, Nanobiophoton Ctr, Fac Phys, Cluj Napoca 400271, Romania

[2] Univ Babes Bolyai, Interdisciplinary Res Inst Bionanosci, Cluj Napoca 400271, Romania

[3] Sapientia Univ, Dept Mech Engn, Fac Tech & Human Sci, Targu Mures 540485, Romania

来源：

JOURNAL OF MOLECULAR STRUCTURE | 2011年 / 993卷 / 1-3期

关键词：

Gold nanorods; LSPR; SERS; p-Aminothiophenol; FDTD; P-AMINOTHIOPHENOL; SILVER; SHAPE;

D O I：

10.1016/j.molstruc.2010.11.045

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：

In the present work, we study the adsorption of p-aminothiophenol (p-ATP) on gold nanorods (GNRs) using localized surface plasmon resonance (LSPR) and surface-enhanced Raman scattering (SERS) spectroscopies, as function of molecular concentration and pH values in solution. The LSPR spectra reveal the adsorption of p-ATP molecules onto the ends of GNRs. We address the intriguing case that has recently emerged in SERS literature regarding the interpretation of p-ATP SERS spectrum. Apart from typical electromagnetic bands of p-ATP, the aggregation of GNRs at basic pH revealed the appearance in SERS spectra of some extra bands, which can be assigned to the formation of p,p'-dimercaptoazobenzene (DMAB) through chemical transformation of p-ATP on metallic substrates. We correlate the SERS results with theoretical simulations of electromagnetic enhancement of Raman signal for individual and assembled GNRs by employing the Finite-Difference Time-Domain (FDTD) method. (c) 2010 Elsevier B.V. All rights reserved.

引用

页码：420 / 424

页数：5

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