Mild Temperature Thermal Treatments of Gold-Exfoliated Monolayer MoS2

Sangiorgi, Emanuele and Madonia, Antonino and Laurella, Gianmarco and Panasci, Salvatore E. and Schilirò, Emanuela and Giannazzo, Filippo and Píš, Igor and Bondino, Federica and Radnóczi, György Zoltán and Kovácsné Kis, Viktória and Pécz, Béla and Buscarino, Gianpiero and Gelardi, Franco M. and Cannas, Marco and Agnello, Simonpietro (2025) Mild Temperature Thermal Treatments of Gold-Exfoliated Monolayer MoS2. NANOMATERIALS, 15 (3). ISSN 2079-4991

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Abstract

Monolayer molybdenum disulfide is considered an extremely promising two-dimensional material for innovative electronics due to its direct bandgap and high charge-carrier mobility. The optical and electronic properties of monolayer MoS2 can, however, be strongly influenced by the specific synthesis route, posing challenges for industrial-scale production. In this study, we investigated the effects of moderate temperature thermal treatments under a controlled O2 atmosphere on the properties of monolayer MoS2 flakes. We found that the treatments can effectively tune the doping level of monolayer MoS2. Notably, 225 °C was identified as the optimal temperature for enhancing its optical emission properties. Our findings suggest that the removal of sulfur vacancies and impurities underlies these effects, demonstrating a promising approach for tuning the properties of monolayer MoS2 at mild temperatures.

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