Τίτλος:
Influence of annealing and rinsing on magnetic and photocatalytic properties of TiO 2
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
Samples of TiO 2, calcined at 100 °C (type 1) and 200 °C (type 2), have been prepared without and with water rinsing. The crystallite sizes determined by XRD method were smaller than 15 nm for both types of samples. Magnetic resonance spectra of the obtained samples have been studied in 230-300 K temperature range. Before rinsing no magnetic spectra were observed but after rinsing the magnetic response appeared in form of a resonance line centered at g eff ∼ 2.54 with linewidth ΔH pp ∼ 460 G in type 1 samples and g eff ∼ 2.26 with linewidth ΔH pp ∼ 220 G in type 2 samples. The integrated intensity of the observed spectrum was two times greater in the type 1 sample. The resonance line could be attributed to the localized magnetic moments in the correlated spin system formed during rinsing. The rinsing resulted also in higher photocatalytic properties under UV-VIS irradiation. It is suggested that the number of oxygen vacancies increases after rinsing and as they are involved in the formation of low oxidation states of titanium ions, they could be responsible for the appearance of the observed magnetic properties. © 2011 Elsevier B.V. All rights reserved.
Συγγραφείς:
Guskos, N.
Guskos, A.
Typek, J.
Berczynski, P.
Dolat, D.
Grzmil, B.
Morawski, A.
Περιοδικό:
Materials Science and Engineering B: Solid-State Materials for Advanced Technology
Λέξεις-κλειδιά:
Integrated intensities; Localized magnetic moments; Low oxidation state; Magnetic resonance spectra; Magnetic response; Magnetic spectra; Photocatalytic property; Resonance line; Spin systems; Surfaces and interfaces; Temperature range; TiO; Titanium ion; Water rinsing; XRD, Calcination; Magnetic moments; Magnetic properties; Magnetic resonance spectroscopy; Nanostructures; Optical properties; Oxygen vacancies; Paramagnetic resonance; Paramagnetism; Resonance; Titanium; Titanium dioxide, Electron spin resonance spectroscopy
DOI:
10.1016/j.mseb.2011.10.017
