TY - JOUR
T1 - Twin defect derived growth of atomically thin MoS2 dendrites
AU - Wang, Jingwei
AU - Cai, Xiangbin
AU - Shi, Run
AU - Wu, Zefei
AU - Wang Weijun, Weijun
AU - Long, Gen
AU - Tang, Yongjian
AU - Cai, Nianduo
AU - Ouyang, Wenkai
AU - Geng, Pai
AU - Chandrashekar, Bananakere Nanjegowda
AU - Amini, Abbas
AU - Wang, Ning
AU - Cheng, Chun
PY - 2018
Y1 - 2018
N2 - Morphology management for tailoring the properties of monolayer transition-metal dichalcogenides (TMDCs), that is, molybdenum disulfide (MoS2), has attracted great interest for promising applications such as in electrocatalysis and optoelectronics. Nevertheless, little progress has been made in engineering the shape of MoS2. Herein, we introduce a modified chemical vapor deposition method to grow monolayer MoS2 dendrites by pretreating substrates with adhesive tapes. The as-grown MoS2 crystals are featured with hexagonal backbones with fractal shapes and tunable degrees. By characterizing the atomic structure, it is found that these morphologies are mainly initiated from the twin defect derived growth and controlled by the S:Mo vapor ratio. Due to the accumulated sulfur vacancies in the cyclic twin regions, strong enhancement of photoluminescence emission is localized, which determines the shape dependency of optical property. This work not only enriches the understanding of the twin defects derived crystal growth mechanism and extends its applications from nanomaterials to two-dimensional crystals, but also offers a robust and controllable protocol for shape-engineered monolayer TMDCs in electrochemical and optoelectronic applications.
AB - Morphology management for tailoring the properties of monolayer transition-metal dichalcogenides (TMDCs), that is, molybdenum disulfide (MoS2), has attracted great interest for promising applications such as in electrocatalysis and optoelectronics. Nevertheless, little progress has been made in engineering the shape of MoS2. Herein, we introduce a modified chemical vapor deposition method to grow monolayer MoS2 dendrites by pretreating substrates with adhesive tapes. The as-grown MoS2 crystals are featured with hexagonal backbones with fractal shapes and tunable degrees. By characterizing the atomic structure, it is found that these morphologies are mainly initiated from the twin defect derived growth and controlled by the S:Mo vapor ratio. Due to the accumulated sulfur vacancies in the cyclic twin regions, strong enhancement of photoluminescence emission is localized, which determines the shape dependency of optical property. This work not only enriches the understanding of the twin defects derived crystal growth mechanism and extends its applications from nanomaterials to two-dimensional crystals, but also offers a robust and controllable protocol for shape-engineered monolayer TMDCs in electrochemical and optoelectronic applications.
KW - chemical vapor deposition
KW - dendritic crystals
KW - molybdenum disulfide
KW - snowflakes
KW - twinning (crystallography)
UR - http://handle.westernsydney.edu.au:8081/1959.7/uws:45865
U2 - 10.1021/acsnano.7b07693
DO - 10.1021/acsnano.7b07693
M3 - Article
SN - 1936-086X
SN - 1936-0851
VL - 12
SP - 635
EP - 643
JO - ACS Nano
JF - ACS Nano
IS - 1
ER -