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 M. Rioux; James D. Hoefelmeyer

doi:10.1016/j.ica.2014.08.011

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 M. Rioux, James D. Hoefelmeyer

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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 language	English (US)
Pages (from-to)	8-13
Number of pages	6
Journal	Inorganica Chimica Acta
Volume	422
DOIs	https://doi.org/10.1016/j.ica.2014.08.011
State	Published - Oct 1 2014

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All Science Journal Classification (ASJC) codes

Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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Sathe, A., Peck, M. A., Balasanthiran, C., Langell, M. A., Rioux, R. M., & Hoefelmeyer, J. D. (2014). X-ray photoelectron spectroscopy of transition metal ions attached to the surface of rod-shape anatase TiO₂ nanocrystals. Inorganica Chimica Acta, 422, 8-13. https://doi.org/10.1016/j.ica.2014.08.011

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

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+.",

author = "Ajay Sathe and Peck, {Matthea A.} and Choumini Balasanthiran and Langell, {Marjorie A.} and Rioux, {Robert M.} and Hoefelmeyer, {James D.}",

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doi = "10.1016/j.ica.2014.08.011",

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AU - Sathe, Ajay

AU - Peck, Matthea A.

AU - Balasanthiran, Choumini

AU - Langell, Marjorie A.

AU - Rioux, Robert M.

AU - Hoefelmeyer, James D.

PY - 2014/10/1

Y1 - 2014/10/1

N2 - 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+.

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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JO - Inorganica Chimica Acta

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10.1016/j.ica.2014.08.011