Open Access

Huo Ye¹, Jiantong Li², Lingna Xu^3,*
Chalcogenide Letters, DOI:10.32604/cl.2026.087654
（This article belongs to the Special Issue: Research and Application of Chalcogenide Semiconductor Materials in Gas Sensors)
Abstract SF₆ is the primary insulating and arc extinction medium in gas-insulated switchgear (GIS). Sulfur hexafluoride (SF₆) decomposes to create diagnostic markers, such as sulfur dioxide (SO₂), thionyl fluoride (SOF₂), and hydrogen sulfide (H₂S) when electrical problems occur, such as partial discharge and local overheating. Accurate quantification of these fault-marker gases is important for the early identification of insulation defects and the condition assessment of SF₆-insulated equipment. Molybdenum disulfide (MoS₂) is a well-known and atomically thin van der Waals semiconductor that has attracted considerable attention as a platform for gas-sensing applications. This is due to its large accessible surface area,… More >

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Open Access

Minghui Tan^1,2, Fei Wang^2,*, Shan Yuan^1,2, Xinli Li¹, Jingxia Gao², Jinping Zhang^2,*, Yong Zhang², Lei Shi³
Chalcogenide Letters, DOI:10.32604/cl.2026.088891
（This article belongs to the Special Issue: New Horizons in Structural Design and Experimental Synthesis of Chalcogenide-based Materials for Energy Storage and Conversion)
Abstract Li/Na/K-ion batteries show huge potential in next-generation energy storage systems, but the limited theoretical capacity of commercial graphite anodes and the relatively large radius of Na/K ions seriously restrict further development, making it urgent to develop new high-performance anode materials. This article begins with the research hotspots of selenide anode materials and systematically reviews the applications of DFT calculations in the field of Li/Na/K-ion battery selenide anodes, covering transition metal dichalcogenides (MoSe₂, TiSe₂), Janus structures (VSeTe, WSSe), transition metal carboselenides (Zr₂Se₂C, Sc₂Se₂C), multi-anion bridged phosphoselenides (MoScP₂Se₆), main-group element layered selenides (Si₂Se₂, SiSe₂, β-GeSe, γ-GeSe, β-CSe, GeSeNS, SnS_2(1−x)Se_2x), as well… More >

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ARTICLE

Weihang Qiu¹, Bo Zhang², Zhaofeng Gu^2,*, Zijun Liu², Xiang Shen², Yimin Chen^1,2,*
Chalcogenide Letters, DOI:10.32604/cl.2026.089518
Abstract This study presents electron-beam evaporated As₂Se₃ films tailored for far-infrared heterogeneous metalenses. Characterization via X-ray diffraction and Raman spectroscopy reveals a structurally relaxed network in the films compared to bulk glass, resulting in enhanced infrared transmittance, a reduced refractive index, and a lower glass transition temperature. However, thermal expansion mismatch is found to induce cracking in thick films subjected to thermal cycling. The As₂Se₃/BaF₂ system demonstrates superior adhesion, attributed to a minimal thermal expansion mismatch (Δα < 2.5 × 10⁻⁶°C⁻¹). Notably, an 8 μm thick film endures over thirty rapid heating and liquid nitrogen quenching cycles without More >

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