Aging studies on chemical vapor deposition and mechanically exfoliated molybdenum disulfide flakes heated in ambient air

Owiredu, Paul; Roy, Arijit; Skinner, Elise A.; Ito, Takashi; Singh, Gurpreet

doi:10.1088/1361-6528/ae123f

Aging studies on chemical vapor deposition and mechanically exfoliated molybdenum disulfide flakes heated in ambient air

Journal Article · Wed Oct 22 20:00:00 EDT 2025 · Nanotechnology

DOI:https://doi.org/10.1088/1361-6528/ae123f· OSTI ID:3008419

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Kansas State Univ., Manhattan, KS (United States)

The structural integrity of atomically thin two-dimensional molybdenum disulfide (MoS₂) is crucial for high-temperature applications, including nanoelectronics and optoelectronics. This study explores the structural stability and electrical performance, under extended thermal exposure in air, of MoS₂ flakes synthesized via chemical vapor deposition (CVD) and mechanical exfoliation. The MoS₂ flakes, both CVD-grown and mechanically exfoliated, were subjected to heating at 200 °C with a relative humidity of 60(±5)% for a prolonged period and investigated with atomic force microscopy and Raman spectroscopy. This study shows that CVD-grown flakes developed noticeable cracks after prolonged heating, whereas mechanically exfoliated flakes mostly retained their structural integrity. Also, both types of flakes showed a decrease in layer thickness and lateral size over time, with mechanically exfoliated flakes exhibiting a comparatively smaller reduction in substrate coverage area. In addition, MoS₂-based two-terminal devices were subjected to heating at 150 °C for approximately 1100 h, and their electrical characterization revealed a steady rise in current during constant voltage (5 V) conditions. This study enhances our understanding of MoS₂ stability and provides guidance for improving the reliability of MoS₂-based devices in high-temperature electronic applications.

View Accepted Manuscript (DOE)

Research Organization:: Kansas City Plant (KCP), Kansas City, MO (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: NA0002839; SC0012704

OSTI ID:: 3008419

Report Number(s):: NSC--614-6895

Journal Information:: Nanotechnology, Journal Name: Nanotechnology Journal Issue: 43 Vol. 36; ISSN 1361-6528; ISSN 0957-4484

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Aging studies on chemical vapor deposition and mechanically exfoliated molybdenum disulfide flakes heated in ambient air

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