%0 Journal Article %1 WOS:000302524600032 %A Pan, Minghu %A Girao, E Costa %A Jia, Xiaoting %A Bhaviripudi, Sreekar %A Li, Qing %A Kong, Jing %A Meunier, V %A Dresselhaus, Mildred S %C 1155 16TH ST, NW, WASHINGTON, DC 20036 USA %D 2012 %I AMER CHEMICAL SOC %J NANO LETTERS %K chemical deposition; edge microscopy/spectroscopy} nanoribbon; scanning states; tunneling vapor {Graphene; %N 4 %P 1928-1933 %R 10.1021/nl204392s %T Topographic and Spectroscopic Characterization of Electronic Edge States in CVD Grown Graphene Nanoribbons %V 12 %X We used scanning tunneling microscopy and spectroscopy (STM/S) techniques to analyze the relationships between the edge shapes and the electronic structures in as-grown chemical vapor deposition (CVD) graphene nanoribbons (GNRs). A rich variety of single-layered graphene nanoribbons exhibiting a width of several to 100 nm and up to 1 mu m long were studied. High-resolution STM images highlight highly crystalline nanoribbon structures with well-defined and clean edges. Theoretical calculations indicate clear spin-split edge states induced by electron electron Coulomb repulsion. The edge defects can significantly modify these edge states, and different edge structures for both sides of a single ribbon produce asymmetric electronic edge states, which reflect the more realistic features of CVD grown GNRs. Three structural models are proposed and analyzed to explain the observations. By comparing the models with an atomic resolution image at the edge, a pristine (2,1) structure was ruled out in favor of a reconstructed edge structure composed of 5-7 member rings, showing a better match with experimental results, and thereby suggesting the possibility of a defective morphology at the edge of CVD grown nanoribbons.

@article{WOS:000302524600032, abstract = {We used scanning tunneling microscopy and spectroscopy (STM/S) techniques to analyze the relationships between the edge shapes and the electronic structures in as-grown chemical vapor deposition (CVD) graphene nanoribbons (GNRs). A rich variety of single-layered graphene nanoribbons exhibiting a width of several to 100 nm and up to 1 mu m long were studied. High-resolution STM images highlight highly crystalline nanoribbon structures with well-defined and clean edges. Theoretical calculations indicate clear spin-split edge states induced by electron electron Coulomb repulsion. The edge defects can significantly modify these edge states, and different edge structures for both sides of a single ribbon produce asymmetric electronic edge states, which reflect the more realistic features of CVD grown GNRs. Three structural models are proposed and analyzed to explain the observations. By comparing the models with an atomic resolution image at the edge, a pristine (2,1) structure was ruled out in favor of a reconstructed edge structure composed of 5-7 member rings, showing a better match with experimental results, and thereby suggesting the possibility of a defective morphology at the edge of CVD grown nanoribbons.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, author = {Pan, Minghu and Girao, E Costa and Jia, Xiaoting and Bhaviripudi, Sreekar and Li, Qing and Kong, Jing and Meunier, V and Dresselhaus, Mildred S}, biburl = {https://www.bibsonomy.org/bibtex/206005cd3a03f0b0d7c7cef25c493bbd7/ppgfis_ufc_br}, doi = {10.1021/nl204392s}, interhash = {ddaf95f7b7e78b15b5901289c2e6f79c}, intrahash = {06005cd3a03f0b0d7c7cef25c493bbd7}, issn = {1530-6984}, journal = {NANO LETTERS}, keywords = {chemical deposition; edge microscopy/spectroscopy} nanoribbon; scanning states; tunneling vapor {Graphene;}, number = 4, pages = {1928-1933}, publisher = {AMER CHEMICAL SOC}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Topographic and Spectroscopic Characterization of Electronic Edge States in CVD Grown Graphene Nanoribbons}, tppubtype = {article}, volume = 12, year = 2012 }