Long-term aging of CVD grown 2D-MoS2 nanosheets in ambient environment

Nitul S. Rajput , Ahmed Kotbi (1, 2) , Khaled Kaja (3) , Mustapha Jouiad (4)

1 MAC & PM Laboratory, ANEPMAER Group, FSTM
2 LIMAT - Laboratoire d'Ingénierie et Matériaux [Casablanca]
3 CEA-LETI - Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information
4 LPMC - Laboratoire de Physique de la Matière Condensée - UR UPJV 2081

A chemically vapor deposited MoS2 nanosheets (NSs) is aged in the laboratory at ambient and at 40% average humidity for similar to 36 months. Nanorods of few microns in length and few nanometers in diameter are found to grow from the MoS2 seeds. They have been growing as a result of the chemical reaction between the MoS2 NSs and ambient O-2 and moisture, they exhibit an amorphous phase structure in the stoichiometric form of MoO3. Density functional theory simulations further reveal the role of H2O and O-2 in the transformation of the MoS2 NSs. The adsorption energy of O-2 molecules on the MoS2 sites is E-ad = -1.09 eV as compared to lowest absolute E-ad = -0.10 eV of H2O indicating the favorable adsorption of O-2 and subsequent Mo oxidation. This study provides valuable insight into the aging phenomenon of MoS2 exposed to O-2 and moisture which might limit their application.

Domaines: Matière Condensée [cond-mat]

Nitul S. Rajput, Ahmed Kotbi, Khaled Kaja, Mustapha Jouiad. Long-term aging of CVD grown 2D-MoS2 nanosheets in ambient environment. npj Materials Degradation, 2022, 6 (1), ⟨10.1038/s41529-022-00288-4⟩. ⟨hal-03778919⟩