@article{Cao2018, 
author = {Yun Cao and Jing Qi and Yan-Fang Zhang and Li Huang and Qi Zheng and Xiao Lin and Zhihai Cheng and Yu-Yang Zhang and Xinliang Feng and Shixuan Du and Sokrates T. Pantelides and Hong-Jun Gao},
title = {Tuning the morphology of chevron-type graphene nanoribbons by choice of annealing temperature},
year = {2018},
journal = {Nano Research},
volume = {11},
number = {12},
pages = {6190-6196},
keywords = {chevron-type graphene nanoribbon, C–S bond cleavage, negative differential resistance, scanning tunneling microscopy (STM), noncontact atomic force microscopy (NC-AFM), first-principles calculations},
url = {https://www.sciopen.com/article/10.1007/s12274-018-2136-3},
doi = {10.1007/s12274-018-2136-3},
abstract = {Bottom-up synthesis of graphene nanoribbons (GNRs) by surface-assisted polymerization and cyclodehydrogenation of specifically designed precursor monomers has been shown to yield precise edges and doping. Here we use a precursor monomer containing sulfur atoms to fabricate nanostructures on a Au(111) surface at different annealing temperatures. The nanostructures have distinct configurations, varying from sulfur-doped polymers to sulfur-doped chevron-type GNRs (CGNRs) and, finally, pristine graphene nanoribbons with specific edges of periodic five-member carbon rings. Non-contact atomic force microscopy provides clear evidence for the cleavage of C–S bonds and formation of pristine CGNRs at elevated annealing temperatures. First-principles calculations show that the CGNRs exhibit negative differential resistance.}
}