Tuning MoS2 nanostructures for superior room-temperature toluene sensing

IF 4.1 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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