Tungsten disulfide (WS2) nanosheets have attracted considerable attention because of their unique optical and electrical properties. Several methods for fabrication of WS2 nanosheets have been developed. However, methods for mass production of high-quality WS2 nanosheets remain challenging. In this study, WS2 nanosheets were fabricated using mechano-chemical ball milling based on the synergetic effects of chemical intercalation and mechanical exfoliation. The ball-milling time was set as a variable for the optimized fabricating process of WS2 nanosheets. Under the optimized conditions, the WS2 nanosheets had lateral sizes of 500–600 nm with either a monolayer or bilayer. They also exhibited high crystallinity in the 2H semiconducting phase. Thus, the proposed method can be applied to the exfoliation of other transition metal dichalcogenides using suitable chemical intercalants. It can also be used with highperformance WS2-based photodiodes and transistors used in practical semiconductor applications.

Abstract
1. 서 론
2. 실험방법
3. 결과 및 고찰
4. 결 론
감사의 글
References

• 김슬기(충북대학교 도시·에너지·환경 융합학부) | Seulgi Kim (Department of Urban, Energy, and Environmental Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju, Chungbuk 28644, Republic of Korea)
• 안윤희(충북대학교 도시·에너지·환경 융합학부) | Yunhee Ahn (Department of Urban, Energy, and Environmental Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju, Chungbuk 28644, Republic of Korea)
• 이동주(충북대학교 도시·에너지·환경 융합학부,충북대학교 신소재공학과) | Dongju Lee (Department of Urban, Energy, and Environmental Engineering, Chungbuk National University,Department of Advanced Materials Engineering, Chungbuk National University) Corresponding author