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Valence-preset Zn3As2 as a solid-state precursor for controlled arsine generation.
Hongrui Xiang1, Zhihui Yang1,2,3, Meiqing Shi1,2,3
1School of Metallurgy and Environment, Central South University, Changsha, 410083, China. feiping.zhao@csu.edu.cn.
Chemical Communications (Cambridge, England)
|July 8, 2026
Summary
Researchers synthesized zinc arsenide (Zn3As2) for controlled arsine gas generation. This valence engineering approach offers a programmable method for releasing arsine from solid-state precursors.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Chemical Engineering
Background:
- Controlled generation of toxic gases like arsine (AsH3) is crucial for various chemical processes.
- Solid-state precursors offer potential safety and handling advantages over traditional gas sources.
- Understanding the chemical mechanisms governing gas release from precursors is essential for developing effective strategies.
Purpose of the Study:
- To synthesize a phase-pure zinc arsenide (Zn3As2) material.
- To investigate its capability as a valence-preset precursor for controlled arsine generation.
- To compare its performance with other zinc arsenide compounds (e.g., ZnAs2) for arsine release.
Main Methods:
- Synthesis of Zn3As2 via pressurized sintering.
- Experimental characterization of the material and its reaction pathways.
- Density Functional Theory (DFT) calculations to determine adsorption energies and reaction barriers.
Main Results:
- Phase-pure Zn3As2 was successfully synthesized.
- Zn3As2 demonstrated lower proton adsorption energies and reduced As-H formation barriers compared to ZnAs2.
- These findings indicate a more facile and controlled generation of arsine from Zn3As2.
Conclusions:
- Valence engineering of zinc arsenides is a viable strategy for programmable arsine release.
- Zn3As2 serves as an effective valence-preset precursor for controlled arsine generation.
- The study provides fundamental insights into the chemical principles governing solid-state arsine precursors.
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