文献详情
Tailoring the thermal transport properties of monolayer hexagonal boron nitride by grain size engineering
文献类型：期刊
通讯作者：Wang, L; Chen, SS (reprint author), Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China.; Wang, L; Chen, SS (reprint author), Renmin Univ China, Beijing Key Lab Optoelect Funct Nat Mat & Microna, Beijing 100872, Peoples R China.
期刊名称：2D MATERIALS影响因子和分区
年：2020
卷：7
期：1
ISSN：2053-1583
关键词：thermal conductivity; monolayer h-BN; opto-thermal Raman measurement; grain boundaries; chemical vapor deposition
所属部门：物理学系
摘要：The grain size effect on the thermal transport properties of hexagonal boron nitride (h-BN) thin films was experimentally investigated using the opto-thermal Raman technique. High-quality monolayer h-BN with mean grain sizes ranging from similar to 7 mu m to similar to 19 nm were successfully synthesized on Pt foil by chemical vapor deposition (CVD). The thermal conductivity (kappa) of the single-crystalline h-BN was measured to be similar to 545 Wm(-1) K-1 at 315K, well above the bulk value, an ...More
The grain size effect on the thermal transport properties of hexagonal boron nitride (h-BN) thin films was experimentally investigated using the opto-thermal Raman technique. High-quality monolayer h-BN with mean grain sizes ranging from similar to 7 mu m to similar to 19 nm were successfully synthesized on Pt foil by chemical vapor deposition (CVD). The thermal conductivity (kappa) of the single-crystalline h-BN was measured to be similar to 545 Wm(-1) K-1 at 315K, well above the bulk value, and more than a factor of four higher than the value of poly-crystalline h-BN with mean grain size of similar to 19 nm. The very low thermal boundary conductance (deduced to be similar to 9.6 GW m(-2) K-1) accounts for the significant reduction of kappa for h-BN with small grain size. Molecular dynamics (MD) simulations reveal that due to the disordered vibrations of atoms along/near GB, the phonon scattering in poly-crystalline h-BN is greatly enhanced compared to large-grained or single-crystalline samples. These results provide a deep understanding of the thermal transport in two-dimensional systems as well as the possible technological applications. ...Hide

DOI：10.1088/2053-1583/ab5ae0
百度学术：Tailoring the thermal transport properties of monolayer hexagonal boron nitride by grain size engineering
语言：外文
人气指数：3
浏览次数：3
基金：National Natural Science Foundation of ChinaNational Natural Science Foundation of China [11374244, 11675262, 11774032, 51571035]; Beijing Natural Science FoundationBeijing Natural Science Foundation [2192024, 1192010]; Fundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central Universities; Research Funds of Renmin University of China [17XNLF02]; FANEDDFoundation for the Author of National Excellent Doctoral Dissertation of China [201443]
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