Mapping Thermal Expansion Coefficients in Freestanding 2D Materials at the Nanometer Scale

Physical Review Letters
Xuan HuRobert F Klie

Abstract

Two-dimensional materials, including graphene, transition metal dichalcogenides and their heterostructures, exhibit great potential for a variety of applications, such as transistors, spintronics, and photovoltaics. While the miniaturization offers remarkable improvements in electrical performance, heat dissipation and thermal mismatch can be a problem in designing electronic devices based on two-dimensional materials. Quantifying the thermal expansion coefficient of 2D materials requires temperature measurements at nanometer scale. Here, we introduce a novel nanometer-scale thermometry approach to measure temperature and quantify the thermal expansion coefficients in 2D materials based on scanning transmission electron microscopy combined with electron energy-loss spectroscopy to determine the energy shift of the plasmon resonance peak of 2D materials as a function of sample temperature. By combining these measurements with first-principles modeling, the thermal expansion coefficients (TECs) of single-layer and freestanding graphene and bulk, as well as monolayer MoS_{2}, MoSe_{2}, WS_{2}, or WSe_{2}, are directly determined and mapped.

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Citations

Nov 18, 2018·Nanotechnology·Xinsheng WangLiming Xie
Jun 17, 2021·Journal of the American Chemical Society·Mingjie FengLi-Jun Wan
Mar 26, 2019·ACS Nano·Seyed Mohammadreza GhodsiConstantine M Megaridis
Sep 10, 2020·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Raveena GuptaJesús Carrete
Feb 28, 2019·ACS Nano·Poya YasaeiVinayak P Dravid
Mar 21, 2018·Nano Letters·Wei WuMichael T Pettes
Feb 13, 2019·Nano Letters·Wei WuMichael Thompson Pettes

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