Abstract: MoS2 coatings were formed on surface-oxidized silicon, chemical vapor deposition (CVD)-grown graphene, and reduced fluorinated graphene (rFG) from ammonium tetrathiomolybdate. The samples were annealed under ultra-high vacuum conditions at a temperature of 1000 ◦C. Analysis of X-ray photoelectron and X-ray absorption spectra revealed a bonding between MoS2 and the supporting material that was particularly strong for CVD- graphene. Uniform covering of the flat CVD-graphene surface with MoS2 nanoparticles and numerous contacts between them promoted the removal of sulfur and the formation of exposed molybdenum edges. A cracked MoS2 coating consisting of dense domains was formed on the wrinkled rFG surface. The study of samples as NO2 gas sensors revealed the best performance of MoS2/CVD-graphene. The sensor detected NO2 in air below 50 ppb at room temperature, had good response and recovery, operated in humid air, and demonstrated excellent NO2 selectivity. The other two sensors gave signals at elevated temperatures. The advantage of MoS2/CVD-graphene is due to improved electron transport in the hybrid, accessibility of small MoS2 nanoparticles to the analyte, and passivation of high-energy molybdenum sites by oxygen, which improves NO2 desorption.

Cite: Bulusheva L.G. , Fedoseeva Y.V. , Lavrukhina S.A. , Sysoev V.I. , Maksimovskii E.A. , Makarova A.A. , Okotrub A.V.
Role of graphene substrate in the formation of MoS2-based nanoparticles with improved sensitivity to NO2 gas
Applied Surface Science. 2025. V.679. 161104 :1-12. DOI: 10.1016/j.apsusc.2024.161104

Dates:

Submitted:	May 31, 2024
Accepted:	Aug 27, 2024
Published online:	Aug 29, 2024
Published print:	Jan 15, 2025

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