Doping and Dedoping in SWCNT Film by the Spontaneous Redox Process

Abstract

Single-walled carbon nanotube (SWCNT) film was deposited with MnO2 using a spontaneous redox reaction between MnO4 ̅ ions and the SWCNTs. Doping and dedoping had a significant effect on the sheet resistance of the resulting SWCNT film. The injection of holes in the SWCNT film bleached the van Hove singularity transitions (E 11 S) observed by optical absorption spectroscopy. The observed doping was not permanent, and spontaneous reduction under ambient conditions restored the defects and dedoped the SWCNT film. Dedoping increased the Fermi level and restored the van Hove singularity transitions (E 11 S). The doping and dedoping mechanism of these films was investigated. Transmission electron microscopy, X-ray photoelectron spectroscopy, and optical transmission spectroscopy were used to characterize the films.

A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts

“…572 This galvanic displacement method can also be used for the preparation of oxide NP. Thus, the spontaneous redox reaction between MnO 4 − ions (KMnO 4 aqueous solution) and CNT provides MnO 2 NP 573 or MnO 2 coating on the CNT surface. 574 Cu 2 O NP (4−5 nm) were produced on CNT from the spontaneous reduction from [Cu(NH 3 ) 4 ] 2+ aqueous solution.…”

Observation of ferromagnetic semiconductor behavior in manganese-oxide doped graphene

“…Following reaction, MnO 4 − + 3e − + 4H + → MnO 2 + 2H 2 O, which was well schematically shown in Ref. 33, makes MnO 2 possible to deposit on graphene. Figure 2(b) shows Raman spectra of manganese-oxide.…”