Citation: WEN Zuo-Ying, TANG Xiao-Feng, WANG Tao, GU Xue-Jun, ZHANG Wei-Jun. Detection of Chemical Compositions of Ultrafine Nanoparticles by a Vacuum Ultraviolet Photoionization Nucleation Aerosol Mass Spectrometer[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(4): 491-497. doi: 10.19756/j.issn.0253-3820.191648 shu

Detection of Chemical Compositions of Ultrafine Nanoparticles by a Vacuum Ultraviolet Photoionization Nucleation Aerosol Mass Spectrometer

1.
Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
2.
Graduate School, University of Science and Technology of China, Hefei 230026, China

Received Date: 4 November 2019
Revised Date: 8 December 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 91644109, 21773249, U1832184) and the National Key R&D Program of China (No. 2016YFC0200300).

A vacuum ultraviolet photoionization nucleation aerosol mass spectrometer (VUVPI-AMS) was utilized for detection of chemical compositions of ultrafine nanoparticles with size less than 100 nm. A commercial nano scanning mobility particle sizer (Nano-SMPS) was employed to size-select ultrafine nanoparticles and measure their size distribution. A special aerodynamic lens was developed to transfer and focus the ultrafine nanoparticle into the vacuum. After heated on the surface of the heater, the ultrafine nanoparticles were vaporized and changed into gas-phase molecules, followed by softly photoionization at their ionization energy thresholds by the VUV light emitted from a commercial 10.6 eV krypton discharge lamp. A home-made orthogonal acceleration reflection time-of-flight mass analyzer was adopted to measure the mass of ions. As representative examples, the dioctyl phthalate (DOP) ultrafine nanoparticles and the nucleation nanoparticles from the ozonolysis reaction of α-pinene with ozone were studied and their chemical compositions were obtained with molecular information.
- Vacuum ultraviolet photoionization mass spectrometer,
- Ultrafine nanoparticle,
- Chemical composition,
- α-Pinene
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沈阳化工大学材料科学与工程学院沈阳 110142