Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session U53: Synthesis and Characterizations Large Scale of 2D Materials II
2:30 PM–5:06 PM,
Thursday, March 5, 2020
Room: Mile High Ballroom 1F
Sponsoring
Unit:
DMP
Chair: Robert Hovden
Abstract: U53.00004 : Step edge-mediated assembly of periodic arrays of long graphene nanoribbons on Au(111)
Presenter:
Wenchang Lu
(North Carolina State University)
Authors:
Wenchang Lu
(North Carolina State University)
Chuanxu Ma
(Oak Ridge National Laboratory)
Zhongcan Xiao
(North Carolina State University)
Jingsong Huang
(Oak Ridge National Laboratory)
Kunlun Hong
(Oak Ridge National Laboratory)
An-Ping Li
(Oak Ridge National Laboratory)
Jerry Bernholc
(North Carolina State University)
Graphene nanoribbons (GNRs) can be fabricated with atomic precision via bottom-up synthesis on metal substrates, but the growth of long GNRs still remains a challenge. We have previously investigated the growth mechanism of GNRs from molecular precursors on Au substrate [1]. Recently, we have observed that the step edges of an Au (111) substrate can enhance GNR growth and yield significantly longer GNRs and periodic GNR arrays on the Au(111) surface [2]. By studying the atomic structures and electronic properties <!-- You studied adsorption energies instead of electronic properties in this paper, correct? -->near step edges by DFT calculations, we have found that the intermediate polyanthryl structures adsorb more strongly along Au step edges due to pi-pi interactions between polyanthryls near the steps, which result in longer and more compact polymer arrays and lead to the synthesis of longer GNRs. Our findings suggest a direction for the manufacturing of longer GNRs for future applications.
[1] Z. Xiao, C. Ma, W. Lu, J. Huang, L. Liang, K. Hong, A.-P. Li, B. G. Sumpter, J. Bernholc, npj Comp. Mat. 5, 91 (2019).
[2] C. Ma, Z. Xiao, W. Lu, J. Huang, K. Hong, J. Bernholc, A.-P. Li, Chem. Commun. 55, 11848-11851 (2019).
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