Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 109, Issue 15, Pages 5588-5593Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1116897109
Keywords
carbon dioxide; eco-friendly; edge-functionalization; graphite
Categories
Funding
- World Class University (WCU)
- US-Korea NBIT
- Basic Research Laboratory (BRL) through National Research Foundation (NRF) of Korea
- US Air Force Office of Scientific Research (AFOSR)
- National Research Foundation of Korea [2010-0019408, 2010-00301, R31-2012-000-20012-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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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