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Direct Synthesis of Large‐Scale WTe 2 Thin Films with Low Thermal Conductivity
Author(s) -
Zhou Yu,
Jang Hyejin,
Woods John M.,
Xie Yujun,
Kumaravadivel Piranavan,
Pan Grace A.,
Liu Jingbei,
Liu Yanhui,
Cahill David G.,
Cha Judy J.
Publication year - 2017
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201605928
Subject(s) - materials science , crystallite , thin film , thermal conductivity , chemical engineering , single crystal , crystal (programming language) , nanotechnology , composite material , crystallography , metallurgy , chemistry , programming language , computer science , engineering
Large‐scale, polycrystalline WTe 2 thin films are synthesized by atmospheric chemical vapor reaction of W metal films with Te vapor catalyzed by H 2 Te intermediates, paving a way to understanding the synthesis mechanism for low bonding energy tellurides and toward synthesis of single‐crystalline telluride nanoflakes. Through‐plane and in‐plane thermal conductivities of single‐crystal WTe 2 flakes and polycrystalline WTe 2 thin films are measured for the first time. Nanoscale grains and disorder in WTe 2 thin films suppress the in‐plane thermal conductivity of WTe 2 greatly, which is at least 7.5 times lower than that of the single‐crystalline flakes.