Charged iodide in chains behind the highly efficient iodine doping in carbon nanotubes
- Rice Univ., Houston, TX (United States)
- Rensselaer Polytechnic Inst., Troy, NY (United States); Université Fédérale de Toulouse-Midi-Pyrénées (France)
- Université Fédérale de Toulouse-Midi-Pyrénées (France); Guangdong University of Technology (China)
- Rensselaer Polytechnic Inst., Troy, NY (United States)
- Université Fédérale de Toulouse-Midi-Pyrénées (France)
The origin of highly efficient iodine doping of carbon nanotubes is not well understood. Relying on first- principles calculations, we found that iodine molecules (I2) in contact with a carbon nanotube interact to form monoiodide or/and polyiodide from two and three I2 as a result of removing electrons from the carbon nanotube (p-type doping). Charge per iodine atom for monoiodide ion or iodine atom at end of iodine chain is significantly higher than that for I2. This atomic analysis extends previous studies showing that polyiodide ions are the dominant dopants. Moreover, we observed isolated I atoms in atomically resolved transmission electron microscopy, which proves the production of monoiodide. Lastly, using Raman spectroscopy, we quantitatively determined the doping level and estimated the number of conducting channels in high electrical conductivity fibers composed of iodine-doped double-wall carbon nanotubes.
- Research Organization:
- Rice Univ., Houston, TX (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office
- Grant/Contract Number:
- EE0007865
- OSTI ID:
- 1638541
- Alternate ID(s):
- OSTI ID: 1410397
- Journal Information:
- Physical Review Materials, Vol. 1, Issue 6; ISSN 2475-9953
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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