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Energy gap opening by crossing drop cast single-layer graphene nanoribbons
| Content Provider | Scilit |
|---|---|
| Author | PoLin, Liu Yamada, Toyo Kazu Fukuda, Hideto Fujiwara, Taizo Nakamura, Kohji Kasai, Seiya de Parga, Amadeo Lopez Vazquez Tanaka, Hirofumi |
| Copyright Year | 2018 |
| Description | Journal: Nanotechnology Band gap opening of a single-layer graphene nanoribbon (sGNR) sitting on another sGNR, fabricated by drop casting GNR solution on Au(111) substrate in air, was studied by means of scanning tunneling microscopy (STM) and spectroscopy (STS) in ultra-high vacuum (UHV) at 78 K and 300 K. GNRs with a width of ~45 nm were prepared by unzipping double-walled carbon nanotubes (diameter ~15 nm) with ultrasonic method. In contrast to atomically-flat GNRs fabricated via the bottom-up process, the drop cast sGNRs were buckled on Au(111), i.e., some local points of a sGNR contacts with the substrate (d~0.5 nm), but other parts float (d~1-3 nm), where d denotes measured distance between sGNR and the substrate. In spite of the fact that the nanoribbons are buckled, dI/dV maps confirmed that each buckled sGNR has metallic character (~3.5 Go) with considerable uniform local density of states, comparable to a flat sGNR. However, when two sGNRs cross each other, the cross areas show a band gap between ─50 and +200 meV around the Fermi energy, i.e., the only upper sGNR electronic property changes from metallic to p-type semiconducting, which is not due to the bending of the upper sGNR by lifting up on the lower sGNR, but the electronic interactions between up and down sGNRs, where the height variation of ~1.0 nm varies within Δ~7 nm, while the dI/dV differential conductance map showed a sharp change from 0.20±0.05 nA/V to 0.00±0.01 nA/V within Δ~3 nm. |
| Related Links | http://iopscience.iop.org/article/10.1088/1361-6528/aac36b/pdf |
| ISSN | 09574484 |
| e-ISSN | 13616528 |
| DOI | 10.1088/1361-6528/aac36b |
| Journal | Nanotechnology |
| Issue Number | 31 |
| Volume Number | 29 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2018-05-09 |
| Access Restriction | Open |
| Subject Keyword | Journal: Nanotechnology Graphene Nanoribbon Scanning Tunneling Microscopy |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Nanoscience and Nanotechnology Mechanics of Materials Mechanical Engineering Bioengineering Electrical and Electronic Engineering |
