Research Article


2018, 11(12): 6190–6196


Tuning the morphology of chevron-type graphene nanoribbons by choice of annealing temperature

Yun Cao1,§, Jing Qi1,§, Yan-Fang Zhang1,§, Li Huang1, Qi Zheng1, Xiao Lin1, Zhihai Cheng2, Yu-Yang Zhang1,3, Xinliang Feng4,5 (*), Shixuan Du1 (*), Sokrates T. Pantelides1,3, and Hong-Jun Gao1

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1 Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
2 Department of Physics, Renmin University of China, Beijing 100872, China
3 Department of Physics and Astronomy and Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, Tennessee 37235, USA
4 Center for Advancing Electronics Dresden (cfaed) & Department of Chemistry and Food Chemistry, Technische Universitt Dresden, D-01069 Dresden, Germany
5 School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
§ Yun Cao, Jing Qi, and Yan-Fang Zhang contributed equally to this work.

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
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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.
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Tuning the morphology of chevron-type graphene nanoribbons by choice of annealing temperature. Nano Res. 2018, 11(12): 6190–6196

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