Template-free synthesis of SERS-active gold nanopopcorn for rapid detection of chlorpyrifos residues
2016; Elsevier BV; Volume: 241; Linguagem: Inglês
10.1016/j.snb.2016.11.021
ISSN1873-3077
AutoresQin Xu, Xiaoyu Guo, Li Xu, Ye Ying, Yiping Wu, Ying Wen, Haifeng Yang,
Tópico(s)Melamine detection and toxicity
ResumoChlorpyrifos, one of the broad-spectrum organophosphorus insecticides, is utilized extensively in agriculture. However, chlorpyrifos residues in food and water pose potential risks to human health. In this work, popcorn-like gold nanoparticles were synthesized under mild condition without any surfactant as template and serviced as SERS-active substrate for sensing chlorpyrifos by using a portable Raman spectrometer. The obtained substrate had extremely low background signal and remarkably enhanced SERS signal for detecting trace chlorpyrifos residues in fruit samples due to the "hot spots" formed between tips of gold nanopopcorns. As a result, the portable SERS-sensor system had a limit of detection at 1 μM of chlorpyrifos, which met the requirement of national standard.
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