Band Gap Engineering via Edge-Functionalization of Graphene Nanoribbons

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• 作者：Philipp Wagner ; Christopher P. Ewels ; Jean-Joseph Adjizian ; Laurence Magaud ; Pascal Pochet ; Stephan Roche ; Alejandro Lopez-Bezanilla ; Viktoria V. Ivanovskaya ; Abu Yaya ; Mark Rayson ; Patrick Briddon ; Bernard Humbert
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：December 19, 2013
• 年：2013
• 卷：117
• 期：50
• 页码：26790-26796
• 全文大小：466K
• 年卷期：v.117,no.50(December 19, 2013)
• ISSN：1932-7455

文摘

Density functional calculations are used to perform a systematic study of the effect of edge-functionalization on the structure and electronic properties of graphene nanoribbons (GNRs). 鈭扝, 鈭扚, 鈭扖l, 鈭払r, 鈭扴, 鈭扴H, and 鈭扥H edge-functionalization of armchair, zigzag, and reconstructed Klein-type GNRs was considered. The most energetically favorable edge structure varies depending on the choice of functional group. It is shown, for the first time, that reconstructed Klein-type GNRs are important stable configurations for several edge-functional groups. Band gaps using three different exchange-correlation functionals are calculated. The band gap for armchair GNRs can be tuned over a range of 1.2 eV by varying the edge-functional groups. In contrast, the band gaps of zigzag and reconstructed Klein edge GNRs are largely insensitive to the choice of edge-functional group, and ribbon width is instead the defining factor. Alternatively, the armchair GNR band gap can be controlled by varying the number of functional groups per opposing edge, altering the GNR 鈥渆ffective鈥?width. Edge-functionalization design is an appropriate mechanism to tune the band gap of armchair GNRs.