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Stokes and anti-Stokes Raman spectra of small-diameter isolated carbon nanotubes
| Content Provider | Semantic Scholar |
|---|---|
| Author | Filho, Antonio G. Souza Chou, Shin Grace Samsonidze, Ge. G. Dresselhaus, Gene F. Dresselhaus, Mildred S. Swan, Anna K. Ünlü, M. Selim Goldberg, Bennett B. |
| Copyright Year | 2004 |
| Abstract | By measuring the anti-Stokes ~AS! and Stokes~S! Raman spectra on the same isolated single-wall carbon nanotube~SWNT!, we here determine the electronic transition energies Eii experimentally ( Eii ), and then we compare theseEii exp with the Eii values obtained with theoretical predictions ( Eii ). In such an approach, the nanotube ( n,m) structure identification depends on the theory parameters, but the experimental determination of Eii exp does not, and depends only on the experimental AS/S intensity ratio and the laser energy Elaserused in the experiment. We measured the radial breathing mode frequency vRBM andEii exp for specific tubes, and we then performed the ( n,m) identification by using thedt diameter dependence of the electronic transitions. We present such an analysis for a wide nanotube diameter range, focusing primarily on small diameter SWNTs (dt,1.1 nm), where there are very few ( n,m) possibilities for SWNTs that can be in resonance with the appropriate laser energy Elaser. This allows an experimental determination of Eii exp values to be made for a variety of (n,m) SWNTs. Our experimental results indicate that: ~i! the large curvature in small diameter tubes induces as-p hybridization, thus lowering the electronic band energies, and ~ii ! the simple formulation of the tight binding model ( g052.89 eV) to determineEii starts to deviate fromEii exp for tubes withdt,1.1 nm, but the deviationDE225E22 2E22 cal remains smaller than 20 meV for dt>0.83 nm. A comparison between Eii exp |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://people.chem.duke.edu/~jliu/labgroup/publications/20040326-Filho-prb-col.pdf |
| Alternate Webpage(s) | http://ultra.bu.edu/papers/souza_PRB_04_S-AS.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Diameter (qualifier value) EXPTIME Energy, Physics Experiment Nanotubes Nanotubes, Carbon Navier–Stokes equations Nucleic Acid Hybridization Radial (radio) Raman scattering Resonance Single-Walled Nanotube Small Specimen Source Codes - Tube Tight binding |
| Content Type | Text |
| Resource Type | Article |
