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

作者：Sathe Ajay; Peck Matthea A; Ba****nthiran Choumini; Langell Marjorie A; Rioux Robert M^*; Hoefelmeyer James D

来源：Inorganica Chimica Acta, 2014, 422: 8-13.

DOI：10.1016/j.ica.2014.08.011

• Transition metal ion
• TiO2
• Nanocrystal
• X-ray photoelectron spectroscopy
• Surface
• Graft

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 center dot nH(2)O, MnCl2 center dot nH(2)O, FeCl2 center dot nH(2)O, CoCl2 center dot nH(2)O, NiCl2 center dot nH(2)O, and CuCl2 center dot nH(2)O 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+.

• 出版日期2014-10-1