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MATERIALS RESEARCH BULLETIN · 2017 · IF 2.446

The evolution of structure, chemical state and photocatalytic performance of α-Fe/FeTiO3/TiO2 with the nitridation at different temperatures

S.T. Zhang,Y.R. Ruan,C. Liu,P. Wang,Y.Q. Ma

α-Fe/FeTiO 3 /TiO 2 was synthesized through the reduction of Fe 3 O 4 @TiO 2 at 800 °C, and subsequently nitrided in NH 3 atmosphere at the nitridation temperature T N = 400, 600, 800 and 1000 °C. In the crystal lattice of TiO 2 , with increasing T N , the N element itself exhibits the chemical states of TiO 2-x N x , TiN and interstitial N, and simultaneously it induces the complex variation of the chemical state of the Ti and O elements. The photocatalytic performance of the nitrided samples is not determined only by the chemical states of the N element but by the synergistic effects of chemical states of the N, Ti and O elements.

CAS / MDL: 111-40-0 10025-77-1 67-63-0 546-68-9

研究领域: 材料科学 · 化学

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JOURNAL OF RAMAN SPECTROSCOPY · 2017 ·Vol. 48 ·期 4 ·578-585 · IF 2.969

Composition, microstructure and SERS properties of titanium nitride thin film prepared via nitridation of sol–gel derived titania thin films

Hengyong Wei,Mingming Wu,Zhanliang Dong,Ying Chen,Jinglong Bu,Jian Lin,Yun Yu,Yingna Wei,Yi Cui,Ruisheng Wang

The titanium nitride thin film was successfully prepared via direct nitridation of the sol–gel derived TiO 2 thin film at different temperatures in ammonia gas. The composition, microstructure and optical properties of the thin films were characterized in order to investigate their effect on the surface-enhanced Raman scattering (SERS) performance of the thin films. With the nitridation temperatures increasing, the anatase phase transformed into titanium nitride phase in the films and the concentration of nitrogen incorporation increased accordingly. Consequentially, the sol–gel derived TiO 2 thin film was converted to non-stoichiometry titanium nitride (TiO x N y ) thin film, as determined by X-ray diffraction (XRD), RAMAN and X-ray photoelectron spectroscopy (XPS). As a result, a blue-shift of the surface plasmon resonance absorption peaks and narrowing optical band gap of the thin films were observed, leading to the improvement of SERS performance via electromagnetic enhancement mechanism and charge-transfer effect. In addition, the surface of thin films became gradually rough with the nitridation temperatures increasing, ascribed to the growth of titanium nitride crystal grains. Most of all, the thin films nitrided at 1000 °C had the most rough surface, and many ‘hot spots’ formed on the thin film surface accordingly, which were favorable for enhancing SERS-active, and thereby the thin films exhibited the largest SERS enhancement. Copyright © 2017 John Wiley & Sons, Ltd.

研究领域: 材料科学 · 光谱学

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