Tuning MoS2 nanostructures for superior room-temperature toluene sensing

IF 3.7 Q1 CHEMISTRY, ANALYTICAL Talanta Open Pub Date : 2025-01-09 DOI:10.1016/j.talo.2025.100402

Ruchika Thayil, Saidi Reddy Parne

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Abstract

Nanomaterials, known for their unique chemical and physical properties at the nanoscale, are crucial in advancing various cutting-edge applications. The distinct size-dependent behaviors and surface characteristics set them apart. Among these materials, molybdenum disulfide (MoS₂) has gained considerable interest for room-temperature gas detection due to its high surface area, improved reactivity from the surface, and excellent carrier mobility, which makes it effective in sensing applications. In this work, MoS₂ with excess sodium molybdate dihydrate (MoS₂(Mo)) and MoS₂ with excess thioacetamide (MoS₂(S)) were synthesized using the hydrothermal method and tested for toluene gas sensing at various concentrations. The results indicate that MoS₂(S) showed ΔR/R_air% of 343 % compared to MoS₂(Mo), which is 197 % for 20 ppm toluene gas. In addition, MoS₂(S) showed reduced response/recovery time. The results suggest that these MoS₂-based sensors can be used for the development of room temperature sensors for toluene sensing.

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优化二硫化钼纳米结构，实现卓越的室温甲苯传感

纳米材料以其在纳米尺度上独特的化学和物理性质而闻名，在推进各种尖端应用方面至关重要。不同的尺寸依赖行为和表面特征将它们区分开来。在这些材料中，二硫化钼（MoS2）由于其高表面积、改善的表面反应性和优异的载流子迁移率而在室温气体检测中获得了相当大的兴趣，这使得它在传感应用中有效。本文采用水热法合成了含有过量二水合钼酸钠的二硫化钼（MoS2(Mo)）和含有过量硫乙酰胺的二硫化钼（MoS2(S)），并对不同浓度的甲苯气体传感进行了测试。结果表明，与MoS2（Mo）相比，MoS2(S)的ΔR/Rair%为343%，而在20 ppm甲苯气体中，MoS2(S)的Rair%为1977%。此外，MoS2(S)的响应/恢复时间缩短。结果表明，这些基于二硫化钼的传感器可用于开发用于甲苯传感的室温传感器。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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