Secondary electron emission measurements from imidazolium-based ionic liquids

Capece, A. M.; Enriquez, A. N.

doi:10.1088/1361-6463/ad89d7

Title: Secondary electron emission measurements from imidazolium-based ionic liquids

Journal Article · 31 October 2024 · Journal of Physics. D, Applied Physics

DOI: https://doi.org/10.1088/1361-6463/ad89d7 · OSTI ID:2475862

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The College of New Jersey, Ewing, NJ (United States)

The electron-induced secondary electron emission (SEE) yields of imidazolium-based ionic liquids are presented for primary electron beam energies between 30 and 1000 eV. These results are important for understanding plasma synthesis of nanoparticles in plasma discharges with an ionic liquid electrode. Due to their low vapor pressure and high conductivity, ionic liquids can produce metal nanoparticles in low-pressure plasmas through reduction of dissolved metal salts. In this work, the low vapor pressure of ionic liquids is exploited to directly measure SEE yields by bombarding the liquid with electrons and measuring the resulting currents. The ionic liquids studied are [BMIM][Ac], [EMIM][Ac], and [BMIM][BF₄]. The SEE yields vary significantly over the energy range, with maximum yields of around 2 at 200 eV for [BMIM][Ac] and [EMIM][Ac], and 1.8 at 250 eV for [BMIM][BF₄]. Molecular orbital calculations indicate that the acetate anion is the likely electron donor for [BMIM][Ac] and [EMIM][Ac], while in [BMIM][BF₄], the electrons likely originate from the [BMIM]⁺ cation. The differences in SEE yields are attributed to varying ionization potentials and molecular structures of the ionic liquids. These findings are essential for accurate modeling of plasma discharges and understanding SEE mechanisms in ionic liquids.

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Research Organization:: The College of New Jersey, Ewing, NJ (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE

Grant/Contract Number:: AC02-09CH11466; SC0024655

OSTI ID:: 2475862

Journal Information:: Journal of Physics. D, Applied Physics, Journal Name: Journal of Physics. D, Applied Physics Journal Issue: 3 Vol. 58; ISSN 0022-3727; ISSN 1361-6463

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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