Journal
ANALYTICAL CHEMISTRY
Volume 91, Issue 17, Pages 11192-11199Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.9b02106
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Funding
- Natural Science Foundation of China [21507089]
- Shanghai University Young Teacher Training Program [ZZyy15095]
- Scientific Research Foundation for the Introduction of Talent of Shanghai Institute of Technology [YJ2015-6]
- Natural Science Foundation of Shanghai [18ZR1408100]
- Scientific Research Program of Fire Rescue Bureau of MEM [2019XFGG04]
- Shanghai Municipal Education Commission (Plateau Discipline Construction Program)
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Development of flexible surface-enhanced Raman spectroscopy (SERS) substrate with controllable hot spots has spurred increasing interest because of its unique structure and plasmonic properties. Here, charged poly(vinyl alcohol) microgels containing silver nanoparticles are developed by using microfluidic emulsification to produce a smart SERS sensor with charge screening and signals amplification. Importantly, this charged microgel enables the selective concentration of counter-charged molecules and induces the formation of assembled arrays at an immiscible liquid-liquid interface because of the electrostatic interaction. The SERS-active microgels arrays possess controllable structures and facilitate on-site determination of charged pesticides with an enhancement factor of 5.0 x 10(5). Such nanostructures present the ease of assembly, stability, and reproducibility which allow multiplex detection of analytes at aqueous and organic phases without any pretreatment of complex matrix samples. The interfacial sensing platform for on-site SERS analysis of charged pesticides will open vast possibilities for a wide range of in-field applications.
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