Fast and large-area growth of uniform MoS2 monolayers on molybdenum foils. Nanoscale. 2016

Nanoscale
Guoan Tai, Tian Zeng, Jin Yu, Jianxin Zhou, Yuncheng You, Xufeng Wang,
Hongrong Wu, Xu Sun, Tingsong Hua, and Wanlin Guo
DOI: 10.1039/c5nr07226c
Fast and large-area growth of uniform MoS2 monolayers on molybdenum foils.
The State Key Laboratory of Mechanics and Control of Mechanical Structures, Key
Laboratory for Intelligent Nano Materials and Devices of Ministry of Education and
Institute of Nanoscience, College of Aerospace Engineering, Nanjing University of
Aeronautics and Astronautics, Nanjing 210016, China.
E-mail: taiguoan@nuaa.edu.cn, wlguo@nuaa.edu.cn
School of Material Science and Technology, Nanjing University of Aeronautics and
Astronautics, Nanjing 210016, China

Abstract
A controllable synthesis of two-dimensional crystal monolayers in a large area is a prerequisite for potential applications, but the growth of transition metal dichalcogenide monolayers in a large area with spatial homogeneity remains a great challenge. Here we report a novel and efficient method to fabricate largescale MoS2 monolayers by direct sulfurization of pre-annealed molybdenum foil surfaces with large grain boundaries of more than 50 µm in size at elevated temperatures. Continuous MoS2 monolayers can be formed uniformly by sulfurizing the Mo foils in sulfur vapor at 600 °C within 1 min. At a lower temperature even down to 500 °C, uniform MoS2 monolayers can still be obtained but in a much longer sulfurizing duration. It is demonstrated that the formed monolayers can be nondestructively transferred onto arbitrary substrates by removing the Mo foil using diluted ferric chloride solution and can be successfully fabricated into photodetectors. The results show a novel avenue to efficiently fabricate two-dimensional crystals in a large area in a highly controllable way and should have great potential for the development of large-scale applications of two-dimensional crystals in electrophotonic systems

http://pubs.rsc.org/is/content/articlehtml/2015/nr/c5nr07226c

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