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Physicochemical analysis of individual atmospheric fine particles based on effective surface-enhanced Raman spectroscopy

查看全文 作　　者：Zhenli [1]Sun;Fengkui [1]Duan;Kebin [1,2]He;Jingjing [3]Du;Liu [1]Yang;Hui [1]Li;Tao [1]Ma;Shuo [1]Yang 高影响力作者 机构地区：[1]State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University;[2]State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Tsinghua University;[3]State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences高影响力机构 出　　处：《Journal of Environmental Sciences》索引2019年第31卷第1期,共8页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (Nos.21707077,81571130090);the National Key Research and Development Program (Nos.2017YFC0211500,2016YFC0202700,2017YFC0211601);the Science Fund for Creative Research Groups (No.21521064);the China Postdoctoral Science Foundation (No.2017M610923) 摘　　要：Fine particles associated with haze pollution threaten the health of more than 400 million people in China. It is therefore of great importance to thoroughly investigate and understand their composition. To determine the physicochemical properties in atmospheric fine particles at the micrometer level, we described a sensitive and feasible surface-enhanced Raman scattering(SERS) method using Ag foil as a substrate. This novel method enhanced the Raman signal intensities up to 10,000 a.u. for ν(NO_3^-) in fine particles.The SERS effect of Ag foil was further studied experimentally and theoretically and found to have an enhancement factor of the order of ~10~4. Size-fractionated real particle samples with aerodynamic diameters of 0.4–2.5 μm were successfully collected on a heavy haze day,allowing ready observation of morphology and identification of chemical components, such as soot, nitrates, and sulfates. These results suggest that the Ag-foil-based SERS technique can be effectively used to determine the microscopic characteristics of individual fine particles, which will help to understand haze formation mechanisms and formulate governance policies. 关 键 词：SERS PM2.5 INDIVIDUAL PARTICLE ATMOSPHERIC
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