In:
physica status solidi (b), Wiley, Vol. 246, No. 11-12 ( 2009-12), p. 2419-2422
Abstract:
We report that nitronium hexafluoroantimonate (NHFA) can be used as a strong p‐type dopant on single‐walled carbon nanotubes (SWCNTs). The diameter range of SWCNTs in this work ranged from 1.2 to 1.8 nm. The NHFA was dissolved in a mixed solution of tetramethylsilane/1,2‐dichloroethane (1:1 by weight) with SWCNTs. The treated samples in liquid phase were characterized by UV–VIS–NIR absorption and Raman spectroscopies. We found that with increasing the NHFA concentration, the van Hove singularity‐related transitions ( ${\rm E}_{11}^{\rm S}$ , ${\rm E}_{22}^{\rm S}$ , and ${\rm E}_{11}^{\rm M}$ ) in the optical absorption spectra disappeared gradually and a new transition peak was clearly observed near 1.33 eV. G‐band in the Raman spectra was upshifted to 1618 cm −1 from 1587 cm −1 of the pristine peak due to the phonon stiffening, an evidence of p‐type doping. The sheet resistance of the SWCNT film was reduced up to 90%. After thermal annealing, the Raman spectra were recovered, similar to those of the pristine sample without any damage.
Type of Medium:
Online Resource
ISSN:
0370-1972
,
1521-3951
DOI:
10.1002/pssb.v246:11/12
DOI:
10.1002/pssb.200982318
Language:
English
Publisher:
Wiley
Publication Date:
2009
detail.hit.zdb_id:
208851-4
detail.hit.zdb_id:
1481096-7
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