Improvement of the reproducibility in LIBS single levitated aerosol particle analysis based on particle size-selectivity of photophoretic optical trap

Tianye Liu; Xuemei Cheng; Qian Zhang; Tianlong Zhang; Jintao Bai

doi:10.1016/j.talanta.2023.125326

Improvement of the reproducibility in LIBS single levitated aerosol particle analysis based on particle size-selectivity of photophoretic optical trap

Talanta. 2023 Oct 20;268(Pt 1):125326. doi: 10.1016/j.talanta.2023.125326. Online ahead of print.

Authors

Tianye Liu¹, Xuemei Cheng², Qian Zhang³, Tianlong Zhang⁴, Jintao Bai¹

Affiliations

¹ State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Density, Institute of Photonics & Photon-Technology, Northwest University, Xi'an, 710069, China.
² State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Density, Institute of Photonics & Photon-Technology, Northwest University, Xi'an, 710069, China. Electronic address: [email protected].
³ State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Density, Institute of Photonics & Photon-Technology, Northwest University, Xi'an, 710069, China; China School of Electronic Engineering XI'AN University of Posts &Telecommunications, Xi'an, 710121, China.
⁴ Key Laboratory of Synthetic and Natural Functional Molecular Chemistry of Ministry of Education, College of Chemistry & Material Science, Northwest University, Xi'an, 710127, China.

PMID: 39491847
DOI: 10.1016/j.talanta.2023.125326

Abstract

To improve the reproducibility of single particle analysis with LIBS, we study the particle size selectivity of photophoretic optical trap. Firstly, the photophoretic force is theoretically simulated and size selectivity in a Gaussian trapping beam is analyzed. Then, the particle size is statistically examined under different power of the trapping Gaussian beam. The results indicate the larger particles are selected by the trap with higher laser power, which is in good agreement with the theoretical expectation. In addition, comparing the particle size distribution of hollow beam trapping with that of Gaussian beam, we found the particle size distribution in hollow beam trapping is broader, which is due to the larger freedom of radiating area on the particle in the hollow beam. Finally, the reproducibility of single particle LIBS is testified. The results show better reproducibility can be achieved with Gaussian beam as a narrower range in particle size is obtained by the trap. This work suggest optical trap can provide a useful tool to control the freedom of particle size and therefore improve the reproducibility of single particle analysis.

Keywords: Particle size-selectivity; Photophoretic optical trap; Reproducibility in LIBS; Single levitated aerosol particle.