论文期刊

Multi-branched gold nanostars with fractal structure for SERS detection of the pesticide thiram




作者: Jian Zhu*, Mei-Jin Liu, Jian-Jun Li, Xin Li, Jun-Wu Zhao*
发表/完成日期: 2017-11-15
期刊名称: Spectrochimica Acta Part A
期卷: 189
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论文简介
The surface-enhanced Raman scattering (SERS) activity of multi-branched gold nanostars with fractal structure
has been investigated for trace detection of pesticide thiram. Raman spectrum results show that the gold
nanostars substrate can produce about 102 fold stronger signal than the thiramalone with the thiramconcentration
increase of 103 times and 1.4 fold stronger signal than the gold nanostars without fractal feature. In the detection
procedure, themost prominent SERS peak at 1376 cm−1 has been chosen to characterize and quantify the
concentration of thiram. Experimental results indicate this Raman substrate based on fractal gold nanostars exhibits
excellent selective probing performance for thiramwith a detection limit as lowas 10−10Minsolution and
0.24 ng/cm2 in apple peels. Interference experiment results show that the effects from the interfering pesticides
could be neglected in the detection procedure. Therefore, the gold nanostars as a SERS substrate have excellent
sensitivity and selectivity.
© 2017 Elsevier B.V. All rights reserved.