Paper Title:
X-Ray Photoelectron Spectroscopy of Anatase-TiO2 Coated Carbon Nanotubes

A high efficiency nanocomposite photocatalyst is reported. Multiwall carbon nanotubes (MWNTs) were coated with titania. Two distinct types of nanocomposites were synthesized with variation in the synthetic procedure. One of the nanocomposites is based on a core of arc-discharge synthesized multiwall carbon nanotubes; whereas the other is based on a core of chemical vapor deposition (CVD) grown MWNTs. The nanocomposites have a similar appearance in transmission electron microscopy pictures in that they have a core of MWNTs that are chemically bonded to a few nanometer thick layer of pure anatase phase of titania. Yet they show a dramatically different photocatalytic behavior when they are compared on the basis of rates of photocatalytic decomposition of an organic dye in aqueous media following the Langmuir-Hinshelwood mechanism. This article focuses on the analysis of the differences in the nanocomposites using X-Ray Photoelectron Spectroscopy (XPS). XPS spectra of these materials indicate that there are distinct differences. However, they also show that both share C-O-Ti bonds that transform the carbon in the carbon nanotubes into a dopant for the anatase titania. This doping seems to be essential for long wavelength, i.e. visible light induced photocatalysis.

Solid State Phenomena (Volume 162)
Edited by
Maria K. Nowotny and Janusz Nowotny
P. Georgios, S. M. Wolfgang, "X-Ray Photoelectron Spectroscopy of Anatase-TiO2 Coated Carbon Nanotubes ", Solid State Phenomena, Vol. 162, pp. 163-177, Jun. 2010
Online since
June 2010
US$ 28,-
Authors: Walter Kenji Yoshito, Nildemar A.M. Ferreira, Ana Carolina S. Coutinho Rumbao, Dolores Ribeiro Ricci Lazar, Valter Ussui
Abstract:Titania ceramics have many applications due to its surface properties and, recently, its nanostructured compounds, prepared by hydrothermal...
Authors: Man Sig Lee, Ju Dong Lee, Hong Dae Kim, Seong Soo Hong
Abstract:Nanosized TiO2-SiO2 particles were prepared by controlled hydrolysis of titanium tetraisopropoxide (TTIP) and...
Authors: Tao Yu, Xin Tan, Peng Chen, Hong Mei Wang
Chapter 8: Energy Materials, Engineering Materials and Processing Technologies
Abstract:Lanthanum-doped anatase TiO2 coatings, which are composed of assemble crystalline of 50 nm diameter particles, when the percentage...
  | Authors: Manoj A. Lazar, Rajesh J. Tayade, H. C. Bajaj, R. V. Jasra
Abstract:Present work describes the synthesis of nanocrystalline TiO2 photocatalyst using sol-gel and solution combustion methods and their...
Authors: Lin Li, Sheng Qi Xi, Yang Nan Xing, Fei Hu Shang
Abstract:Titania powder was prepared by a sol-gel method and heat-treatment (HT). The morphology and structure of the titania powder were...