期刊
ACS NANO
卷 6, 期 3, 页码 2261-2272出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn2043252
关键词
carbon nanoribbon; carbon nanotube; molecular expansion; nitrogen-doped; unzipping
类别
资金
- Ministry of Education, Culture, Sports, Science and Technology of Japan
- Research Center for Exotic Nanocarbons, JST
- Center for Nanophase Materials Sciences
- Office of Basic Energy Sciences at Oak Ridge National Laboratory, U.S. Department of Energy
We report a novel physicochemical route to produce highly crystalline nitrogen-doped graphene nanoribbons. The technique consists of an abrupt N-2 gas expansion within the hollow core of nitrogen-doped multiwalled carbon nanotubes (CNx-MWNTs) when exposed to a fast thermal shock. The multiwalled nanotube unzipping mechanism is rationalized using molecular dynamics and density functional theory simulations, which highlight the importance of open-ended nanotubes in promoting the efficient introduction of N-2 molecules by capillary action within tubes and surface defects, thus triggering an efficient and atomically smooth unzipping. The so-produced nanoribbons could be few-layered (from graphene bilayer onward) and could exhibit both crystalline zigzag and armchair edges. In contrast to methods developed previously, our technique presents various advantages: (1) the tubes are not heavily oxidized; (2) the method yields sharp atomic edges within the resulting nanoribbons; (3) the technique could be scaled up for the bulk production of crystalline nanoribbons from available MWNT sources; and (4) this route could eventually be used to unzip other types of carbon nanotubes or intercalated layered materials such as BN, MoS2, WS2, etc.
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