Abstract
A carrier gas mixture of nitrogen and helium has been employed to improve the resolving power at the expense of sensitivity for planar high-field asymmetric ion mobility spectrometry (FAIMS) in previous work. In this paper, a new hollow needle-to-ring ion source was developed, where the helium and nitrogen enter from the hollow needle and ring, respectively. It was found that the signal strengths of acetone, ethanol, and ethyl acetate increased by 8.5, 2.0, and 3.3 times for helium ratios of 20%, 20%, and 10%, respectively. At the same time, the absolute value of compensation voltage and the number of ion peaks increases. It shows that adding an appropriate helium ratio to nitrogen simultaneously improved the sensitivity and resolving power of planar FAIMS, which is reported for the first time.
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Funding
This work was partially supported by the National Natural Science Foundation of China under Grant Numbers 61864001 and 61761013; the Natural Science Foundation of GuangXi Province under Grant Number 2017GXNSFAA198256; and the Foundation of Guangxi Key Laboratory of Automatic Detecting Technology and Instruments (Guilin University of Electronic Technology) under Grant Number YQ18113.
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Li, H., Du, X., Zeng, H. et al. Helium-assisted enhanced discharge in a hollow needle for high-field asymmetric ion mobility spectrometry (FAIMS). Anal Bioanal Chem 413, 2855–2866 (2021). https://doi.org/10.1007/s00216-021-03250-6
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DOI: https://doi.org/10.1007/s00216-021-03250-6