Synthesis of novel decorated one-dimensional gold nanoparticle and its application in ultrasensitive detection of insecticide
Synthesis of novel decorated one-dimensional gold nanoparticle and its application in ultrasensitive detection of insecticide
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DOI：
10.1039/c0jm00040j
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发表时间：
2010-06
影响因子：
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通讯作者：
Jin Wang;Lingtao Kong;Zheng Guo;J. Xu;Jinhuai Liu
中科院分区：
文献类型：
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作者：
Jin Wang;Lingtao Kong;Zheng Guo;J. Xu;Jinhuai Liu
甲基敌百虫是危害性最大的杀虫剂之一，它对土壤、地下水和食品的污染已引起广泛关注。出于对环境样品中杀虫剂痕量分析的迫切需求，寻找新型的高灵敏度或选择性分析方法一直是人们长期关注的问题。采用单6-硫代-β-环糊精修饰不同长径比的一维金纳米粒子，并首次将其应用于表面增强拉曼散射（Sers）技术中，有效地捕获并检测了甲基苯磺酸根杀虫剂。通过对不同长径比的一维金纳米粒子的详细比较，发现长径比为2的一维金纳米粒子可以作为一种优良的Sers活性基底用于杀虫剂的检测。由于杂化空腔与甲基咪唑离子之间有效地形成了主-客体复合物，根据指纹拉曼峰，可以在皮摩尔水平上观察到杀虫剂的鉴定。与其他传统的检测方法相比，利用不含拉曼标记物的一维纳米金杂交颗粒检测杀虫剂具有很高的灵敏度和选择性，是一种简单、灵敏度高的检测方法。
Contamination of soil, groundwater and food with methyl parathion, which is one of the most hazardous insecticides, is causing wide concern. Motivated by the urgent demand for trace analysis of insecticide from environmental samples, searching for a novel highly sensitive or selective analytical approach has been a longstanding interest. The as-prepared one dimensional gold nanoparticles, with different aspect ratios, have been decorated with mono-6-thio-β-cyclodextrin so as to efficiently capture and detect methyl parathion insecticide via a surface enhanced Raman scattering (SERS) technique for the first time. A detailed comparison among different aspect ratios of the one dimensional gold nanoparticles suggests that the one dimensional gold nanoparticles with aspect ratio 2 can be provided as an excellent SERS active substrate for detecting the insecticide in the present study. Due to the efficient formation of a host–guest complex between the hybridized cavity and methyl parathion, identification of the insecticide can be observed at picomolar level according to the fingerprint Raman peaks. Excellent sensitivity and selectivity for detection of the insecticide using the hybridized one dimensional gold nanoparticles without a Raman label indicate that it is a simple and ultrasensitive approach for detecting insecticides in contrast with some other traditional detection approaches.