표면증강 라만 분광법을 이용한 인천 상공 대기 단일입자분석

초록

As air pollution becomes more hazardous to human health, quantification of fine particle composition in the atmosphere is growing even more crucial. Concentration and size distribution measurements are common methods used to investigate the physicochemical properties of airborne aerosols, but it is difficult to understand the mixing state of individual particles. In contrast, single-particle analysis is effective for understanding source of pollutants, as it provides important information about particle shape, chemical composition, and mixing state. Furthermore, by analyzing upper- and ground-level atmospheric particles, it is possible to understand the transport, aging, and formation mechanisms of atmospheric aerosols. In this study, we installed a home-made impactor on a drone, and collected samples from atmosphere both ground level and an altitude of 150 m during clear and haze episodes in Incheon, January 2023. PM1 was analyzed, as the cut-size of the impactor ranged from 430 nm to 1.35 μm. By using surface-enhanced Raman spectroscopy (SERS), we could obtain amplified signals of the molecular bonding structure, even for particles with a diameter under 1 μm. By analyzing a total of 524 particles, we were able to identify differences in the characteristics of the atmosphere between days of low and high concentrations.