Template-free synthesis of SERS-active gold nanopopcorn for rapid detection of chlorpyrifos residues

•Clear and SERS-active gold nanopopcorn are synthesized under mild condition without any surfactants.•The size of the gold nanopopcorn is controllable by tuning the amount of reducing agents.•The developed sensor system can be used for rapid, on-field sensing of chlorpyrifos in food. Chlorpyrifos, o...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2017-03, Vol.241, p.1008-1013
Main Authors: Xu, Qin, Guo, Xiaoyu, Xu, Li, Ying, Ye, Wu, Yiping, Wen, Ying, Yang, Haifeng
Format: Article
Language:English
Subjects:
Chemical synthesis
Chlorpyrifos
Crops
Gold
Gold nanopopcorns
Insecticides
Nanostructure
Portability
Residues
Spectrometers
Substrates
Surface-enhanced Raman scattering
Synthesis
Tips
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Summary:•Clear and SERS-active gold nanopopcorn are synthesized under mild condition without any surfactants.•The size of the gold nanopopcorn is controllable by tuning the amount of reducing agents.•The developed sensor system can be used for rapid, on-field sensing of chlorpyrifos in food. Chlorpyrifos, 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 1μM of chlorpyrifos, which met the requirement of national standard.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2016.11.021