NDLI: Study of concentration-dependent cobalt ion doping of TiO2 and TiO2−xNx at the nanoscale

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Nanoscale Vol - 2 Issue - 6

Nanoscale Vol - 2 Issue - 5

Nanoscale Vol - 2 Issue - 4

Nanoscale Vol - 2 Issue - 3

Nanoscale Vol - 2 Issue - 2

Nanoscale Vol -1

Study of concentration-dependent cobalt ion doping of TiO₂ and TiO_2−xN_x at the nanoscale

Content Provider	Royal Society of Chemistry (RSC)
Author	Qiu, Xiaofeng Burda, Clemens Gole, James L. Glembocki, O. J. Wang, Junwei Prokes, Sharka M.
Copyright Year	2010
Abstract	Experiments with a porous sol–gel generated TiO2 nanocolloid and its corresponding oxynitride TiO2−xNx are carried out to evaluate those transformations which accompany additional doping with transition metals. In this study, doping with cobalt (CoII) ions is evaluated using a combination of core level and VB-photoelectron and optical spectroscopy, complementing data obtained from Raman spectroscopy. Raman spectroscopy suggests that cobalt doping of porous sol–gel generated anatase TiO2 and nitridated TiO2−xNx introduces a spinel-like structure into the TiO2 and TiO2−xNx lattices. TEM and XPS data complemented by valence band-photoelectron spectra demonstrate that metallic cobalt clusters are not formed even at high doping levels. As evidenced by Raman spectroscopy, the creation of a spinel-like structure is commensurate with the room temperature conversion of the oxide and its oxynitride from the anatase to the rutile form. The onset of this kinetically driven process correlates with the formation of spinel sites within the TiO2 and TiO2−xNx particles. Despite their visible light absorption, the photocatalytic activity of these cobalt seeded systems is diminished relative to the oxynitride TiO2−xNx.
Starting Page	1134
Ending Page	1140
Page Count	7
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	2
Issue Number	7
Journal	Nanoscale
DOI	10.1039/c0nr00125b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Spectroscopy Transmission electron microscopy Anatase Spinel Dopant The Onset Conversion of units of temperature Raman Raman spectroscopy Cobalt Titanium dioxide Silicon oxynitride
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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