Graphene nanoribbons initiated from molecularly derived seeds

Austin J. Way, Robert M. Jacobberger, Nathan P. Guisinger, Vivek Saraswat, Xiaoqi Zheng, Anjali Suresh, Jonathan H. Dwyer, Padma Gopalan and Michael S. Arnold ()
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Austin J. Way: University of Wisconsin-Madison
Robert M. Jacobberger: University of Wisconsin-Madison
Nathan P. Guisinger: Center for Nanoscale Materials
Vivek Saraswat: University of Wisconsin-Madison
Xiaoqi Zheng: University of Wisconsin-Madison
Anjali Suresh: University of Wisconsin-Madison
Jonathan H. Dwyer: University of Wisconsin-Madison
Padma Gopalan: University of Wisconsin-Madison
Michael S. Arnold: University of Wisconsin-Madison

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Semiconducting graphene nanoribbons are promising materials for nanoelectronics but are held back by synthesis challenges. Here we report that molecular-scale carbon seeds can be exploited to initiate the chemical vapor deposition (CVD) synthesis of graphene to generate one-dimensional graphene nanoribbons narrower than 5 nm when coupled with growth phenomena that selectively extend seeds along a single direction. This concept is demonstrated by subliming graphene-like polycyclic aromatic hydrocarbon molecules onto a Ge(001) catalyst surface and then anisotropically evolving size-controlled nanoribbons from the seeds along $$\left\langle 110\right\rangle$$ 110 of Ge(001) via CH4 CVD. Armchair nanoribbons with mean normalized standard deviation as small as 11% (3 times smaller than nanoribbons nucleated without seeds), aspect ratio as large as 30, and width as narrow as 2.6 nm (tunable via CH4 exposure time) are realized. Two populations of nanoribbons are compared in field-effect transistors (FETs), with off-current differing by 150 times because of the nanoribbons’ different widths.

Date: 2022
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DOI: 10.1038/s41467-022-30563-6

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