Gold Nanoparticle-Coated ZrO₂-Nanofiber Surface as a SERS-Active Substrate for Trace Detection of Pesticide Residue.
Gold Nanoparticle-Coated ZrO₂-Nanofiber Surface as a SERS-Active Substrate for Trace Detection of Pesticide Residue.
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DOI：
10.3390/nano8060402
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发表时间：
2018-06-03
期刊：
影响因子：
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通讯作者：
Juang YD
中科院分区：
文献类型：
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作者：
Lee H;Liao JD;Sivashanmugan K;Liu BH;Fu WE;Chen CC;Chen GD;Juang YD
由于水果和蔬菜的污染对消费者的健康构成潜在风险，因此有必要对常见农药残留进行痕量检测，以确保水果和蔬菜的安全。然而，家庭需要一种简单、快速和有效的方法来发现残留物。近年来，与表面增强拉曼散射（Sers）相关的技术已经得到很好的发展，特别是用于目标分子的痕量检测。在此，金纳米颗粒（Au NPs）与溶胶-凝胶旋涂氧化锆纳米纤维（ZrO 2 NFs）作为化学稳定的基底集成，并用于Sers应用。通过调节前体浓度（_X，X = 0.05-0.5 M）调节Au NPs/ZrO 2 NFs_X的形貌，并以罗丹明6 G为探针分子，在低浓度下研究了不同拉曼激光波长对Au NPs/ZrO 2 NFs_X表面增强拉曼散射的影响。对目标农药灭多威（P1）、甲萘威（C1）、氯菊酯（P2）和氯氰菊酯（C2）进行了检测分析。Au NPs/ZrO 2 NFs_0.3表现出2.1 × 107的增强因子，可以分别检测浓度低至10−8、10−7、10−7和10−6 M的P1、C1、P2和C2。该方法对有机磷农药有很高的选择性，将农药浸涂在苹果上，然后在稀释的苹果汁中测定，可以清楚地识别出每种农药的特征峰。因此，使用NPs/ZrO 2 NFs_0.3作为一种新型的SERS活性基底，用于痕量检测例如水果或蔬菜上的农药残留是有希望的。
Trace detection of common pesticide residue is necessary to assure safety of fruit and vegetables, given that the potential health risk to consumers is attributed to the contamination of the sources. A simple, rapid and effective means of finding the residue is however required for household purposes. In recent years, the technique in association with surface-enhanced Raman scattering (SERS) has been well developed in particular for trace detection of target molecules. Herein, gold nanoparticles (Au NPs) were integrated with sol-gel spin-coated Zirconia nanofibers (ZrO2 NFs) as a chemically stable substrate and used for SERS application. The morphologies of Au NPs/ZrO2 NFs were adjusted by the precursor concentrations (_X, X = 0.05–0.5 M) and the effect of SERS on Au NPs/ZrO2 NFs_X was evaluated by different Raman laser wavelengths using rhodamine 6G as the probe molecule at low concentrations. The target pesticides, phosmet (P1), carbaryl (C1), permethrin (P2) and cypermethrin (C2) were thereafter tested and analyzed. Au NPs/ZrO2 NFs_0.3 exhibited an enhancement factor of 2.1 × 107, which could detect P1, C1, P2 and C2 at the concentrations down to 10−8, 10−7, 10−7 and 10−6 M, respectively. High selectivity to the organophosphates was also found. As the pesticides were dip-coated on an apple and then measured on the diluted juice containing sliced apple peels, the characteristic peaks of each pesticide could be clearly identified. It is thus promising to use NPs/ZrO2 NFs_0.3 as a novel SERS-active substrate for trace detection of pesticide residue upon, for example, fruits or vegetables.