Tip-Enhanced Raman Spectroscopy of Atmospherically Relevant Aerosol Nanoparticles.
Tip-Enhanced Raman Spectroscopy of Atmospherically Relevant Aerosol Nanoparticles.
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DOI：
10.1021/acs.analchem.6b02760
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发表时间：
2016-09
影响因子：
7.4
通讯作者：
J. Ofner;Tanja Deckert-Gaudig;K. Kamilli;A. Held;H. Lohninger;V. Deckert;B. Lendl
中科院分区：
文献类型：
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作者：
J. Ofner;Tanja Deckert-Gaudig;K. Kamilli;A. Held;H. Lohninger;V. Deckert;B. Lendl
大气气溶胶纳米颗粒在许多大气过程中，特别是在全球气候系统中发挥着重要作用。了解它们通过均质或非均质成核形成以及它们的光化学老化和大气转化，对于评估它们对大气现象的影响至关重要。单粒子分析，如尖端增强拉曼光谱（TERS）打开访问这些纳米粒子的更深入的了解。大气相关的纳米粒子，形成以上的气溶胶烟雾室内模拟盐湖，使用TERS分析。详细研究了11种纳米粒子的TERS谱。大气相关的气溶胶纳米粒子的TERS的第一个结果揭示了无机种子颗粒的存在，在成核模式中相同大小的颗粒的化学多样性，以及在光化学老化过程中的化学转化。因此，通过光学近场光谱（如TERS）对大气纳米颗粒进行单颗粒分析，将通过揭示基于单颗粒的特性，显著有助于阐明大气成核、光化学老化和化学转化过程。
Atmospheric aerosol nanoparticles play a major role in many atmospheric processes and in particular in the global climate system. Understanding their formation by homogeneous or heterogeneous nucleation as well as their photochemical aging and atmospheric transformation is of utmost importance to evaluate their impact on atmospheric phenomena. Single particle analysis like tip-enhanced Raman spectroscopy (TERS) opens access to a deeper understanding of these nanoparticles. Atmospherically relevant nanoparticles, formed above a simulated salt lake inside an aerosol smog-chamber, were analyzed using TERS. TERS spectra of 11 nanoparticles were studied in detail. First results of TERS on atmospherically relevant aerosol nanoparticles reveal the presence of inorganic seed particles, a chemical diversity of equally sized particles in the nucleation mode, and chemical transformation during photochemical aging. Therefore, single particle analysis by optical near-field spectroscopy such as TERS of atmospheric nanoparticles will significantly contribute to elucidate atmospheric nucleation, photochemical aging, and chemical transformation processes by uncovering single particle based properties.