TY - JOUR
T1 - Observing grain boundaries in CVD-grown monolayer transition metal dichalcogenides
AU - Ly, Thuchue
AU - Chiu, Ming-Hui
AU - Li, Ming-yang
AU - Zhao, Jiong
AU - Perello, David J.
AU - Cichocka, Magdalena Ola
AU - Oh, Hyemin
AU - Chae, Sanghoon
AU - Jeong, Hyeyun
AU - Yao, Fei
AU - Li, Lain-Jong
AU - Lee, Young Hee
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by Project Code (IBS-R011-D1).
PY - 2014/10/30
Y1 - 2014/10/30
N2 - Two-dimensional monolayer transition metal dichalcogenides (TMdCs), driven by graphene science, revisit optical and electronic properties, which are markedly different from bulk characteristics. These properties are easily modified due to accessibility of all the atoms viable to ambient gases, and therefore, there is no guarantee that impurities and defects such as vacancies, grain boundaries, and wrinkles behave as those of ideal bulk. On the other hand, this could be advantageous in engineering such defects. Here, we report a method of observing grain boundary distribution of monolayer TMdCs by a selective oxidation. This was implemented by exposing directly the TMdC layer grown on sapphire without transfer to ultraviolet light irradiation under moisture-rich conditions. The generated oxygen and hydroxyl radicals selectively functionalized defective grain boundaries in TMdCs to provoke morphological changes at the boundary, where the grain boundary distribution was observed by atomic force microscopy and scanning electron microscopy. This paves the way toward the investigation of transport properties engineered by defects and grain boundaries. (Figure Presented).
AB - Two-dimensional monolayer transition metal dichalcogenides (TMdCs), driven by graphene science, revisit optical and electronic properties, which are markedly different from bulk characteristics. These properties are easily modified due to accessibility of all the atoms viable to ambient gases, and therefore, there is no guarantee that impurities and defects such as vacancies, grain boundaries, and wrinkles behave as those of ideal bulk. On the other hand, this could be advantageous in engineering such defects. Here, we report a method of observing grain boundary distribution of monolayer TMdCs by a selective oxidation. This was implemented by exposing directly the TMdC layer grown on sapphire without transfer to ultraviolet light irradiation under moisture-rich conditions. The generated oxygen and hydroxyl radicals selectively functionalized defective grain boundaries in TMdCs to provoke morphological changes at the boundary, where the grain boundary distribution was observed by atomic force microscopy and scanning electron microscopy. This paves the way toward the investigation of transport properties engineered by defects and grain boundaries. (Figure Presented).
UR - http://hdl.handle.net/10754/563872
UR - https://pubs.acs.org/doi/10.1021/nn504470q
UR - http://www.scopus.com/inward/record.url?scp=84912574117&partnerID=8YFLogxK
U2 - 10.1021/nn504470q
DO - 10.1021/nn504470q
M3 - Article
SN - 1936-0851
VL - 8
SP - 11401
EP - 11408
JO - ACS Nano
JF - ACS Nano
IS - 11
ER -