Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 25, Issue 33, Pages 5292-5299Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201501972
Keywords
2D materials; atom-thick transition metal dichalcogenides; chemical weathering exfoliation; MoS2 and WS2 monolayers; ultrafast saturable absorption
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Funding
- National Basic Research Program of China [2012CB932302]
- National Natural Science Foundation of China [51321091, 61178060, 91221101]
- Natural Science Foundation for Distinguished Young Scholar of Shandong Province [2012JQ18]
- National Super Computing Centre in Jinan
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2D transition metal dichalcogenides are attracting increased attention because of their excellent electronic and optical properties. Inspired by the natural weathering exfoliation of seaside rocks, a chemical weathering concept for fabricating atom-thick 2D materials from their bulk counterparts is proposed. It is experimentally demonstrated that chemical weathering-assisted exfoliation mechanism is a simple and efficient method of preparing atom-thick MoS2 and WS2 monolayers. These monolayers are difficult to prepare using other approaches. Interestingly, the as-prepared MoS2 and WS2 monolayers exhibit excellent saturable absorption and mode-locking properties in all-solid-state lasers because of intermediate states resulting from S-vacancy defects. The obtained passively Q-switched laser operation with 60 ns pulse width and ultrafast mode locking with 8.6 ps pulse width are promising for all-solid-state laser application.
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