6533b7d6fe1ef96bd12667de
RESEARCH PRODUCT
A Universal Length-Dependent Vibrational Mode in Graphene Nanoribbons
Rimah DarawishRimah DarawishMarta De LucaKlaus MüllenKlaus MüllenOliver BraunOliver BraunJan OverbeckJan OverbeckTim DumslaffQiang SunColin DanielsMickael L. PerrinRoman FaselRoman FaselGabriela Borin BarinVincent MeunierAkimitsu NaritaXiao-ye WangPascal RuffieuxMichel CalameMichel Calamesubject
530 Physicssubstrate transferSTMFOS: Physical sciencesGeneral Physics and Astronomy02 engineering and technology010402 general chemistryDFT01 natural sciencessymbols.namesakegraphene nanoribbons; Raman spectroscopy; length-dependent mode; STM; substrate transfer; vibrational modes; DFT540 ChemistryMesoscale and Nanoscale Physics (cond-mat.mes-hall)General Materials Sciencevibrational modesCondensed Matter - Materials ScienceCondensed Matter - Mesoscale and Nanoscale Physicsbusiness.industryGeneral EngineeringMode (statistics)Materials Science (cond-mat.mtrl-sci)021001 nanoscience & nanotechnology3. Good health0104 chemical sciencesMolecular vibrationRaman spectroscopysymbols570 Life sciences; biologyOptoelectronicslength-dependent mode0210 nano-technologybusinessRaman spectroscopyGraphene nanoribbonsgraphene nanoribbonsdescription
Graphene nanoribbons (GNRs) have attracted considerable interest as their atomically tunable structure makes them promising candidates for future electronic devices. However, obtaining detailed information about the length of GNRs has been challenging and typically relies on low-temperature scanning tunneling microscopy. Such methods are ill-suited for practical device application and characterization. In contrast, Raman spectroscopy is a sensitive method for the characterization of GNRs, in particular for investigating their width and structure. Here, we report on a length-dependent, Raman active low-energy vibrational mode that is present in atomically precise, bottom-up synthesized armchair graphene nanoribbons (AGNRs). Our Raman study demonstrates that this mode is present in all families of AGNRs and provides information on their length. Our spectroscopic findings are corroborated by scanning tunneling microscopy images and supported by first-principles calculations that allow us to attribute this mode to a longitudinal acoustic phonon. Finally, we show that this mode is a sensitive probe for the overall structural integrity of the ribbons and their interaction with technologically relevant substrates.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-12-14 |