title: SERS-based pesticide detection by using nanofinger sensors.
abstract: Simple, sensitive, and rapid detection of trace levels of extensively used and highly toxic pesticides are in urgent demand for public health. Surface-enhanced Raman scattering (SERS)-based sensor was designed to achieve ultrasensitive and simple pesticide sensing. We developed a portable sensor system composed of high performance and reliable gold nanofinger sensor strips and a custom-built portable Raman spectrometer. Compared to the general procedure and previously reported studies that are limited to laboratory settings, our analytical method is simple, sensitive, rapid, and cost-effective. Based on the SERS results, the chemical interaction of two pesticides, chlorpyrifos (CPF) and thiabendazole (TBZ), with gold nanofingers was studied to determine a fingerprint for each pesticide. The portable SERS-sensor system was successfully demonstrated to detect CPF and TBZ pesticides within 15 min with a detection limit of 35 ppt in drinking water and 7 ppb on apple skin, respectively.
authors.affiliation: Center for New Functional Materials Metrology, Korea Research Institute of Standards and Science, Daejeon, 305-340, Korea.
authors.forename: Ansoon
authors.initials: A
authors.lastname: Kim
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Barcelo
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Li
mesh_terms: D004390:Chlorpyrifos / Q000032:analysis; D006046:Gold / Q000737:chemistry; D006801:Humans; D057230:Limit of Detection; D053768:Metal Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000295:instrumentation*; D010575:Pesticides / Q000032:analysis*; D013059:Spectrum Analysis, Raman / Q000295:instrumentation*; D013827:Thiabendazole / Q000032:analysis
chemical_list: D010575:Pesticides; D006046:Gold; D004390:Chlorpyrifos; D013827:Thiabendazole