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Capacitive and Charge Transfer Effects of Single‐Walled Carbon Nanotubes in TiO 2 Electrodes
Author(s) -
AnsónCasaos A.,
RubioMuñoz C.,
HernándezFerrer J.,
Santidrian A.,
Benito A. M.,
Maser W. K.
Publication year - 2019
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201900066
Subject(s) - carbon nanotube , materials science , raman spectroscopy , cyclic voltammetry , electrode , titanium dioxide , nanotechnology , semiconductor , chemical engineering , absorbance , electrochemistry , optoelectronics , composite material , chemistry , physics , engineering , chromatography , optics
Abstract The 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/TiO 2 ). Raman spectroscopy reflects the optoelectronic properties of SWCNTs in the SWCNT/TiO 2 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.