X-ray photoelectron spectroscopy of transition metal ions attached to the surface of rod-shape anatase TiO2 nanocrystals

Ajay Sathe, Matthea A. Peck, Choumini Balasanthiran, Marjorie A. Langell, Robert Martin Rioux, Jr., James D. Hoefelmeyer

Research output: Contribution to journalArticle

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Abstract

X-ray photoelectron spectra were obtained for a series of M-TiO2 samples in which transition metal ions are directly attached to the surface of anatase TiO2 nanocrystals. The samples were prepared using CrCl3·nH2O, MnCl2·nH2O, FeCl2·nH2O, CoCl2·nH2O, NiCl2·nH2O, and CuCl2·nH2O as metal sources. We observed spontaneous air oxidation of the metal for the Mn-TiO2 and Fe-TiO2 samples as indicated by rapid color changes. X-ray photoelectron spectroscopy (XPS) data confirms the oxidation states of the metals Cr, Co, and Ni are unchanged from the precursor, Mn and Fe are oxidized, and Cu is in a more reduced state. The reduction of Cu likely arises during the XPS experiment - a phenomenon well-documented in the literature; whereas UV-Vis data of the Cu-TiO2 dispersions are consistent with Cu2+.

Original languageEnglish (US)
Pages (from-to)8-13
Number of pages6
JournalInorganica Chimica Acta
Volume422
DOIs
StatePublished - Oct 1 2014

Fingerprint

anatase
Titanium dioxide
Nanocrystals
Transition metals
Metal ions
metal ions
nanocrystals
rods
X ray photoelectron spectroscopy
Metals
transition metals
photoelectron spectroscopy
metals
Oxidation
oxidation
x rays
Photoelectrons
Dispersions
photoelectrons
Color

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Sathe, Ajay ; Peck, Matthea A. ; Balasanthiran, Choumini ; Langell, Marjorie A. ; Rioux, Jr., Robert Martin ; Hoefelmeyer, James D. / X-ray photoelectron spectroscopy of transition metal ions attached to the surface of rod-shape anatase TiO2 nanocrystals. In: Inorganica Chimica Acta. 2014 ; Vol. 422. pp. 8-13.
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X-ray photoelectron spectroscopy of transition metal ions attached to the surface of rod-shape anatase TiO2 nanocrystals. / Sathe, Ajay; Peck, Matthea A.; Balasanthiran, Choumini; Langell, Marjorie A.; Rioux, Jr., Robert Martin; Hoefelmeyer, James D.

In: Inorganica Chimica Acta, Vol. 422, 01.10.2014, p. 8-13.

Research output: Contribution to journalArticle

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T1 - X-ray photoelectron spectroscopy of transition metal ions attached to the surface of rod-shape anatase TiO2 nanocrystals

AU - Sathe, Ajay

AU - Peck, Matthea A.

AU - Balasanthiran, Choumini

AU - Langell, Marjorie A.

AU - Rioux, Jr., Robert Martin

AU - Hoefelmeyer, James D.

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AB - X-ray photoelectron spectra were obtained for a series of M-TiO2 samples in which transition metal ions are directly attached to the surface of anatase TiO2 nanocrystals. The samples were prepared using CrCl3·nH2O, MnCl2·nH2O, FeCl2·nH2O, CoCl2·nH2O, NiCl2·nH2O, and CuCl2·nH2O as metal sources. We observed spontaneous air oxidation of the metal for the Mn-TiO2 and Fe-TiO2 samples as indicated by rapid color changes. X-ray photoelectron spectroscopy (XPS) data confirms the oxidation states of the metals Cr, Co, and Ni are unchanged from the precursor, Mn and Fe are oxidized, and Cu is in a more reduced state. The reduction of Cu likely arises during the XPS experiment - a phenomenon well-documented in the literature; whereas UV-Vis data of the Cu-TiO2 dispersions are consistent with Cu2+.

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