Raman Spectroscopy of Graphene Nanoribbons: A Review
نویسنده
چکیده
In the last few years, several methods have been proposed for the production of ultra-narrow stripes of graphene, called graphene nanoribbons, which could find several applications in nanoand opto-electronics. However, every production method gives rise to different types of ribbons, in terms of structural quality, width, edge pattern, and type of functional groups. In this review, we compare the Raman spectrum of graphene nanoribbons produced by different techniques by focusing on the effect of different structural parameters, such as width and edge-patterns. Effects due to changes in the lateral dimension are also discussed by comparing the Raman spectrum of ultra-narrow graphene nanoribbons with the spectrum of polycyclic aromatic hydrocarbons and defective graphene.
منابع مشابه
Kohn anomalies in graphene nanoribbons
The quantum corrections to the energies of the point optical phonon modes Kohn anomalies in graphene nanoribbons NRs are investigated. We show theoretically that the longitudinal optical LO modes undergo a Kohn anomaly effect, while the transverse optical TO modes do not. In relation to Raman spectroscopy, we show that the longitudinal optical modes are not Raman active near the zigzag edge, wh...
متن کاملControlled hydrogenation of graphene sheets and nanoribbons.
The electronic properties of graphene sheets and nanoribbons with different degrees of hydrogenation have been investigated using a combination of charge transport and Raman spectroscopy experiments. The field-effect transistor mobility of graphene is shown to be highly sensitive to the treatment time during atomic hydrogen dose and follows an exponential decrease with time. Raman spectroscopy ...
متن کاملThe effect of gamma - irradiation on few - layered graphene materials
The effect of γ-irradiation on the structure and composition of chemically synthesized few-layered graphene materials was studied. Fully oxidized graphene oxide and graphene nanoribbons, as well as their respective chemically post-reduced forms, were treated under γ-irradiation in an air-sealed environment. Three different irradiation doses of 60, 90 and 150 kGy were applied. Structure and comp...
متن کاملRaman Fingerprints of Atomically Precise Graphene Nanoribbons
Bottom-up approaches allow the production of ultranarrow and atomically precise graphene nanoribbons (GNRs) with electronic and optical properties controlled by the specific atomic structure. Combining Raman spectroscopy and ab initio simulations, we show that GNR width, edge geometry, and functional groups all influence their Raman spectra. The low-energy spectral region below 1000 cm(-1) is p...
متن کاملRaman spectroscopy of lithographically patterned graphene nanoribbons.
Nanometer-scale graphene objects are attracting much research interest because of newly emerging properties originating from quantum confinement effects. We present Raman spectroscopy studies of graphene nanoribbons (GNRs), which are known to have nonzero electronic bandgap. GNRs of width ranging from 15 to 100 nm have been prepared by e-beam lithographic patterning of mechanically exfoliated g...
متن کامل