Humidity-controlled interactions and lifting of MoS2 on SiO2
Fabrication of 2D material devices under ambient conditions faces challenges from humidity-dependent interfacial interactions and doping effects due to intercalated water layers. This study explores adhesion and force dynamics for a monolayer of molybdenum disulfide (MoS _2 ) on silicon dioxide (SiO...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
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| Series: | JPhys Materials |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2515-7639/adaaa1 |
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| Summary: | Fabrication of 2D material devices under ambient conditions faces challenges from humidity-dependent interfacial interactions and doping effects due to intercalated water layers. This study explores adhesion and force dynamics for a monolayer of molybdenum disulfide (MoS _2 ) on silicon dioxide (SiO _2 ) as a function of humidity, using atomic force microscopy (AFM). At low humidity (<10%RH), capillary forces dominate due to a liquid bridge forming between the AFM tip and sample. At intermediate humidity 40%RH, an additional water layer intercalates between the MoS _2 and the SiO _2 and the capillary force model alone is insufficient to describe the tip-sample interactions. Force-distance spectroscopy reveals additional force dynamics related to MoS _2 -lifting and dynamics in the intercalated water. Above 60%RH, water condenses on the MoS _2 and the capillary interactions are reduced. Understanding and identifying these interactions is crucial for optimising deposition of 2D materials under humid conditions. |
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| ISSN: | 2515-7639 |