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Capacitive and charge transfer effects of single‐walled carbon nanotubes in TiO2 electrodes

AuthorsAnsón Casaos, Alejandro; Rubio-Muñoz, Cristina; Hernández-Ferrer, Javier; Santidrián, Ana; Benito, Ana M. ; Maser, Wolfgang K.
KeywordsCarbon nanotubes
Optical spectroscopy
Nanotubos de carbono
Espectroscopía óptica
Issue Date15-Feb-2019
PublisherJohn Wiley & Sons
CitationChemPhysChem 20(6): 838-847 (2019)
AbstractThe transfer of nanoscale properties from single‐walled carbon nanotubes (SWCNTs) to macroscopic systems is a topic of intense research. In particular, inorganic composites of SWCNTs and metal oxide semiconductors are being investigated for applications in electronics, energy devices, photocatalysis, and electroanalysis. In this work, a commercial SWCNT material is separated into fractions containing different conformations. The liquid fractions show clear variations in their optical absorbance spectra, indicating differences in the metallic/semiconducting character and the diameter of the SWCNTs. Also, changes in the surface chemistry and the electrical resistance are evidenced in SWCNT solid films. The starting SWCNT sample and the fractions as well are used to prepare hybrid electrodes with titanium dioxide (SWCNT/TiO2). Raman spectroscopy reflects the optoelectronic properties of SWCNTs in the SWCNT/TiO2 electrodes, while the electrochemical behavior is studied by cyclic voltammetry. A selective development of charge transfer characteristics and double‐layer behavior is achieved through the suitable choice of SWCNT fractions.
Description6 Figuras.- 1 Suplemento.- This is the peer reviewed version of the following article: ChemPhysChem 20: 838-847 (2019), which has been published in final form at DOI:10.1002/cphc.201900066. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Publisher version (URL)http://dx.doi.org/10.1002/cphc.201900066
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