TY - JOUR
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, Robert M.
AU - Hoefelmeyer, James D.
N1 - Funding Information:
We acknowledge Jennifer Gray and Vincent Bojan for assistance with XPS experiments. This work was supported by the National Science Foundation ( CHE-0840507 , CHE-0722632 , CHE-0213320 , EPS-0903804 , DGE-0903685 , CHE-1362385 ) and by the U.S. Department of Energy under Contract Nos. DE-FG02-08ER64624 and DE-EE0000270. A.S. and R.M.R. acknowledge the support from the Air Force Office of Science Research ( AFOSR , No. FA9550-12-1-0204 ).
Publisher Copyright:
© 2014 Elsevier B.V. All rights reserved.
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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U2 - 10.1016/j.ica.2014.08.011
DO - 10.1016/j.ica.2014.08.011
M3 - Article
AN - SCOPUS:85027930956
VL - 422
SP - 8
EP - 13
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
SN - 0020-1693
ER -