@article{Sun2010, 
author = {Zhengzong Sun and Shin-ichiro Kohama and Zengxing Zhang and Jay R. Lomeda and James M. Tour},
title = {Soluble Graphene Through Edge-Selective Functionalization},
year = {2010},
journal = {Nano Research},
volume = {3},
number = {2},
pages = {117-125},
keywords = {Edge-selective functionalization, graphene, energy filtered transmission electron microscopy (EFTEM), chemically-assisted exfoliation},
url = {https://www.sciopen.com/article/10.1007/s12274-010-1016-2},
doi = {10.1007/s12274-010-1016-2},
abstract = {Thermally expanded graphite was functionalized with 4-bromophenyl addends using the in situ diazonium formation procedure, and after mild sonication treatment in N, Nʹ-dimethylformamide, thin graphene layers were exfoliated from the bulk graphite. These chemically-assisted exfoliated graphene (CEG) sheets had higher solubility than pristine graphene without any stabilizer additive. More than 70% of these soluble flakes had less than 5 layers. Energy filtered transmission electron microscopy (EFTEM) elemental mapping provided evidence of the edge-selective diazonium functionalization with graphene. A majority of the Br signals came from the edges of the CEG indicating that the basal planes were not highly functionalized. The CEG was also characterized by X-ray photoelectron spectroscopy, atomic force microscopy, Raman spectroscopy, and transmission electron microscopy.}
}