Layer-by-layer thinning of MoS₂ by thermal annealing.
By thermal annealing, few-layer MoS₂ flakes can be thinned down. In one hour, the upper layer is peeled off due to sublimation. Eventually, monolayer MoS₂ is achieved. We have characterized the process by optical contrast, Raman spectroscopy and atomic force microscopy (AFM), and observed a mixture of surfaces of N and N- 1 layers.
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371. Qihua@ntu.edu.sg.
Xin
X
Lu
Muhammad Iqbal Bakti
MI
Utama
Jun
J
Zhang
Yanyuan
Y
Zhao
Qihua
Q
Xiong