Gold nanoparticle-functionalized thread as a substrate for SERS study of analytes both bound and unbound to gold

被引:27
作者
Ballerini, David R. [1 ]
Ngo, Ying H. [1 ]
Garnier, Gil [1 ]
Ladewig, Bradley P. [1 ]
Shen, Wei [1 ]
Jarujamrus, Purim [1 ,2 ]
机构
[1] Monash Univ, Dept Chem Engn, Clayton, Vic 3800, Australia
[2] Ubon Ratchathani Univ, Fac Sci, Dept Chem, Varinchamrap 34190, Ubon Ratchathan, Thailand
基金
澳大利亚研究理事会;
关键词
gold nanoparticles; surface-enhanced Raman scattering; unbound molecules; thread-based diagnostics; Raman enhancement; ENHANCED RAMAN-SCATTERING; SELF-ASSEMBLED MONOLAYERS; VIBRATIONAL-SPECTRA; SILVER; PHENOLPHTHALEIN; ALKANETHIOLS; ADSORPTION; FORM;
D O I
10.1002/aic.14398
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The potential of thread for use as a substrate for inexpensive, disposable diagnostics for surface-enhanced Raman scattering (SERS) spectroscopy has been showed in this study. Gold-nanoparticle coated thread can be embedded into fabrics to detect chemical or biological analytes in military and medical applications through SERS. Using this inexpensive and widely available material enables reduction in the volumes of nanoparticle solution required compared to alternatives. By testing multiple analytes, it was observed that molecular structure played a significant role in SERS signal amplification, and hence, the technique is limited to the detection of a small number of analytes possessing highly polarizable structures. Although direct chemical bonding between analyte molecules and nanoparticles gives the strongest signal enhancement, it remains possible to easily discern signals generated by analytes not directly bound, provided they possess suitable structure. Amplification of SERS signal by controlling the aggregation state of the gold nanoparticles to increase the number of SERS hotspots was observed. (c) 2014 American Institute of Chemical Engineers AIChE J, 60: 1598-1605, 2014
引用
收藏
页码:1598 / 1605
页数:8
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