@article{b866775dafca4a588d0da0946bf1a2fd,
title = "Hollow “graphene” microtubes using polyacrylonitrile nanofiber template and potential applications of field emission",
abstract = "We report a simple process to connect graphene sheets forming graphene hollow microtubes (GHMs), where the tube diameter can be adjusted in the 100–500 nm range by changing reaction conditions. We discovered that graphene sheets can be seamlessly linked to each other if C atoms are substituted for N atoms at the edges of the sheets during annealing of graphene oxide(G-O)-coated electrospun PAN carbon fibers in ammonia atmosphere. The G-O/carbon hybrid nanofibers framework served as a confining template around which graphene sheets curved to form tubular structures. The GHMs formed by this process are similar to (very) large diameter carbon nanotubes (CNTs) with relatively low curvature whose electron field-emission properties include a low turn-on voltage of 0.18 V/μm (at J = 10 μA/cm2), low threshold field of 0.35 V/μm (at J = 10 mA/cm2), and high field-emission stability. This process to produce GHMs can be scaled up to fabricate GHMs of variable diameter in bulk quantities.",
author = "Zeyu Guo and Huang, {He Dong} and Lixiang Zhong and Ruitao Lv and Huang, {Zheng Hong} and Jia Li and Nestor Perea-Lopez and Pengyan Yang and Mauricio Terrones and Ruoff, {Rodney S.} and Feiyu Kang",
note = "Funding Information: The authors acknowledge support from the National Natural Science Foundation of China (NSFC) Project ( 51962029 , 51602162 , 11874036 ), Inner Mongolia Science and Technology Program ( 2019GG265 ), Natural Science Foundation of Inner Mongolia ( 2018MS05024 ), Program for Young Talents of Science and Technology in Universities of Inner Mongolia Autonomous Region ( NJYT-19-A08 ), Research Program of science and technology at Universities of Inner Mongolia Autonomous Region ( NJZZ17054 ), Program for high-level talents of IMAU ( NDGCC2016-20 ). RSR was supported by IBS-R019-D1 . National Key Research and Development Program of China ( 2017YFB0701600 ), The Guangdong Province Key Area R&D Program ( 2019B010940001 ), The Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program ( 2017BT01N111 ) and Basic Research Project of Shenzhen , China ( JCYJ20170412171430026 ). The authors thank Revathi Bacsa for assistance in preparation of the manuscript. Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",
year = "2020",
month = oct,
day = "15",
doi = "10.1016/j.carbon.2020.05.110",
language = "English (US)",
volume = "167",
pages = "439--445",
journal = "Carbon",
issn = "0008-6223",
publisher = "Elsevier Limited",
}