Edge-carboxylated graphene nanosheets via ball milling
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- Edge-carboxylated graphene nanosheets via ball milling
- Jeon, In-Yup; Shin, Yeon-Ran; Sohn, Gyung-Joo; Choi, Hyun-Jung; Bae, Seo-Yoon; Mahmood, Javeed; Jung, Sun-Min; Seo, Jeong-Min; Kim, Min-Jung; Chang, Dong Wook; Dai, Liming; Baek, Jong-Beom
- Carbon dioxide; Eco-friendly; Edge-functionalization; Graphite
- Issue Date
- NATL ACAD SCIENCES
- PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, v.109, no.15, pp.5588 - 5593
- Low-cost, high-yield production of graphene nanosheets (GNs) is essential for practical applications. We have achieved high yield of edge-selectively carboxylated graphite (ECG) by a simple ball milling of pristine graphite in the presence of dry ice. The resultant ECG is highly dispersable in various solvents to self-exfoliate into single-and few-layer (<= 5 layers) GNs. These stable ECG (or GN) dispersions have been used for solution processing, coupled with thermal decarboxylation, to produce large-area GN films for many potential applications ranging from electronic materials to chemical catalysts. The electrical conductivity of a thermally decarboxylated ECG film was found to be as high as 1214 S/cm, which is superior to its GO counterparts. Ball milling can thus provide simple, but efficient and versatile, and eco-friendly (CO2-capturing) approaches to low-cost mass production of high-quality GNs for applications where GOs have been exploited and beyond.
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