Nonmonotonic thickness-dependence of in-plane thermal conductivity of few-layered MoS₂: 2.4 to 37.8 nm

Abstract

The thermal conductivity of supported MoS2 is discovered to first decrease with thickness (<9.2 nm), then increase with thickness.

Nanostructured and Heterostructured 2D Materials for Thermoelectrics

“…[55] These accurate measurements of the bulk crystals provide a baseline for understanding thermal transport in 2D TMDCs. The thermal conductivities of single-and few-layer TMDCs have been reported by a few Raman-based [57][58][59][60][61][62][63] and micro-bridge-based [64][65][66] measurements, but the limited data scattered in a large range (between ～15 and ～100 W/m•K at RT for monolayer MoS2). Meanwhile, careful MD simulations, [68], [50] first-principles [67] and BTE [69] calculations agreed well on the in-plane thermal conductivities of 2D MoS2.…”

Thermal conductance between water and nm-thick WS2: extremely localized probing using nanosecond energy transport state-resolved Raman

“…41 They reported other works that successfully measured the ITR between thin layers of TMD materials and glass or Si substrate. [42][43][44] Raman spectroscopy based techniques have the advantage of being non-contact, non-invasive, and material-specific that leads to higher accuracy of measured parameters.…”

Energy and Charge Transport in 2D Atomic Layer Materials: Raman-Based Characterization

“…In this technique, three distinct energy transport states in both spatial and time domains are constructed to probe materials’ thermal response. Furthermore, a five-state ET-Raman technique is proposed to measure κ of MoS 2 , and the effects of R and D are taken into consideration, and all these properties are determined simultaneously [ 32 ].…”

“…For transient state, Yuan et al used a picosecond laser to characterize the thermal transport for supported samples [ 32 ]. The laser pulse (13 ps) is so short that the heat conduction becomes very weak.…”

“…( d – f ) Three steady states under a CW laser with 20×, 50×, and 100× objective lenses. Reproduced from [ 32 ], with permission of the PCCP Owner Societies.…”