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- Title
Extremely Efficient Liquid Exfoliation and Dispersion of Layered Materials by Unusual Acoustic Cavitation.
- Authors
Joong Tark Han; Jeong In Jang; Haena Kim; Jun Yeon Hwang; Hyung Keun Yoo; Jong Seok Woo; Sua Choi; Ho Young Kim; Hee Jin Jeong; Seung Yol Jeong; Kang-Jun Baeg; Kilwon Cho; Geon-Woong Lee
- Abstract
Layered materials must be exfoliated and dispersed in solvents for diverse applications. Usually, highly energetic probe sonication may be considered to be an unfavourable method for the less defective exfoliation and dispersion of layered materials. Here we show that judicious use of ultrasonic cavitation can produce exfoliated transition metal dichalcogenide nanosheets extraordinarily dispersed in non-toxic solvent by minimising the sonolysis of solvent molecules. Our method can also lead to produce less defective, large graphene oxide nanosheets from graphite oxide in a short time (within 10 min), which show high electrical conductivity (>20,000 Sm-1) of the printed film. This was achieved by adjusting the ultrasonic probe depth to the liquid surface to generate less energetic cavitation (delivered power ∼6 W), while maintaining sufficient acoustic shearing (0.73 m s-1) and generating additional microbubbling by aeration at the liquid surface.
- Subjects
DISPERSION (Chemistry); CHEMICAL peel; CAVITATION; SOLVENTS; SONICATION; LIQUID surfaces; GRAPHITE oxide
- Publication
Scientific Reports, 2014, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep05133