Effect of compressive stress inducing a band gap narrowing on the photoinduced activities of sol–gel TiO2 films

2011 ◽  
Vol 520 (3) ◽  
pp. 1147-1154 ◽  
Author(s):  
Mohamed N. Ghazzal ◽  
N. Chaoui ◽  
M. Genet ◽  
Eric M. Gaigneaux ◽  
D. Robert
Keyword(s):  
Band Gap ◽  
Compressive Stress ◽  
Sol Gel ◽  
Tio2 Films ◽  
Band Gap Narrowing

scholarly journals Fabrication of Tantalum Oxyfluoride and Oxynitride Thin Films via Ammonolysis of Sol-Gel Processed Tetraethoxo (β-diketonato) Tantalum (V) Precursors for Enhanced Photocatalytic Activity

2021 ◽  
Author(s):  
Mohammad Danish ◽  
Ashutosh Pandey ◽  
Aftab Aslam Parwaz Khan ◽  
Abdullah M Asiri
Keyword(s):  
Thin Films ◽  
Band Gap ◽  
Photoelectron Spectroscopy ◽  
Present Report ◽  
Sol Gel ◽  
Blue Dye ◽  
Undoped Film ◽  
H Nmr ◽  
Elemental Analyses ◽  
Band Gap Narrowing

Abstract In the present report, the generation of Tantalum oxyfluoride and oxynitride upon ammonolysis of the gel obtained from modified tantalum-alkoxo complexes is reported. To the best of our knowledge, this is first report of the formation of tantalum oxyfluoride thin films via ammonolysis of the β-diketone modified tantalum-alkoxo complex [Ta(OEt)4(CF3COCH2COCH3)]m. The integration of nitrogen and fluorine in lattice sites of metal oxides leads to significant reduction in the band gap, resulting in their activation under visible light. Moreover, in this report the effect of the modified alkoxide precursors and ammonolysis on the photo-physical properties of Ta2O5 thin films have also been investigated and compared with the results obtained from films fabricated from unmodified tantalum (V) ethoxide. 1H NMR, 13C NMR and elemental analyses confirmed successful modification of tantalum (V) ethoxide to [Ta(OCH2CH3)4(CH3COCHClCOCH3)]m (1), [Ta(OCH2CH3)4(CF3COCH2COCH3]m (2) and [Ta(OCH2CH3)4 (CH3COC(CH3)2COCH3))]m (3). The fabrication of Ta2O5 thin films involved the spin casting of the gels of modified tantalum alkoxo complexes (processed by sol-gel method) on to glass substrate. X-ray photoelectron spectroscopy results show that nitrogen was incorporated into the ammonolyzed films fabricated from complex precursors (1) and (3), while the presence of fluorine as tantalum oxyfluoride was confirmed in the ammonolyzed film fabricated from complex (2) precursor. The optical characterization insinuate band gap narrowing from 3.55 eV for undoped film prepared from tantalum (V) ethoxide to 3.47 eV for undoped film prepared from [Ta(OEt)4(CF3COCH2COCH3)]m and 3.05 eV for ammonolyzed film obtained from [Ta(OEt)4(CF3COCH2COCH3)]m precursor. Furthermore, enhanced photocatalytic efficiency of the films is demonstrated by degradation of methylene blue dye.

Correlation of Thickness with the Photocatalytic Characteristic of TiO2 Thin Films

2005 ◽  
Vol 486-487 ◽  
pp. 65-68 ◽  
Author(s):  
Sang Wook Lee ◽  
Hyun Suk Jung ◽  
Dong Wook Kim ◽  
Kug Sun Hong
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Stearic Acid ◽  
Band Gap ◽  
Uv Light ◽  
Sol Gel ◽  
Photocatalytic Property ◽  
Tio2 Films ◽  
Tio2 Thin Films ◽  
Sol Gel Process

5, 10, and 30 nm thickness of transparent TiO2 thin films were fabricated using sol-gel process, and the influence of film thickness on the photocatalytic property was investigated. The increase in film thickness was found to enhance the photocatalytic property of the films. Photocatalytic properties of each film were estimated by decomposition of stearic acid. The amount of decomposed stearic acid increased with film thickness (5 - 30 nm). For the case of 30 nm thickness film, the stearic acid was decomposed perfectly in twelve minutes. UV-vis spectra and photocurrents of each film clearly showed that the photoactivities of TiO2 films were related to the amount of absorbed UV light and band gap shift.

Magnetism as a tool for band-gap narrowing of zinc oxide films prepared by sol–gel method

2015 ◽  
Vol 77 (1) ◽  
pp. 240-243 ◽  
Author(s):  
Qi Shao ◽  
Si Qi Yao Chen ◽  
Oi Lam Yeung ◽  
Yi Shu Foo ◽  
Sheung Mei Ng ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Band Gap ◽  
Sol Gel ◽  
Oxide Films ◽  
Gel Method ◽  
Sol Gel Method ◽  
Zinc Oxide Films ◽  
Band Gap Narrowing

Spectroscopic evidence of NOx formation and band-gap narrowing in N-doped TiO2 films grown by pulsed magnetron sputtering

2012 ◽  
Vol 136 (2-3) ◽  
pp. 729-736 ◽  
Author(s):  
R. Gago ◽  
A. Redondo-Cubero ◽  
M. Vinnichenko ◽  
J. Lehmann ◽  
F. Munnik ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Band Gap ◽  
Tio2 Films ◽  
Nox Formation ◽  
Doped Tio2 ◽  
Spectroscopic Evidence ◽  
Band Gap Narrowing ◽  
Pulsed Magnetron

Observation of Optical Band-Gap Narrowing and Enhanced Magnetic Moment in Co-Doped Sol–Gel-Derived Anatase TiO2 Nanocrystals

2018 ◽  
Vol 122 (46) ◽  
pp. 26592-26604 ◽  
Author(s):  
V. R. Akshay ◽  
B. Arun ◽  
Guruprasad Mandal ◽  
Geeta R. Mutta ◽  
Anupama Chanda ◽  
...  
Keyword(s):  
Band Gap ◽  
Magnetic Moment ◽  
Optical Band Gap ◽  
Sol Gel ◽  
Anatase Tio2 ◽  
Tio2 Nanocrystals ◽  
Band Gap Narrowing ◽  
Co Doped

Band-gap narrowing of TiO2 films induced by N-doping

2006 ◽  
Vol 376-377 ◽  
pp. 823-826 ◽  
Author(s):  
Y. Nakano ◽  
T. Morikawa ◽  
T. Ohwaki ◽  
Y. Taga
Keyword(s):  
Band Gap ◽  
Tio2 Films ◽  
N Doping ◽  
Band Gap Narrowing

Effect of V doping on the band-gap reduction of porous TiO2 films prepared by sol–gel route

2010 ◽  
Vol 120 (2-3) ◽  
pp. 277-281 ◽  
Author(s):  
Zhifeng Liu ◽  
Jing Ya ◽  
Lei E ◽  
Ying Xin ◽  
Wei Zhao
Keyword(s):  
Band Gap ◽  
Sol Gel ◽  
Tio2 Films ◽  
Porous Tio2

Fabrication of F–Nb co-doped transparent conducting TiO2 films using the sol-gel method

2021 ◽  
Vol 126 ◽  
pp. 105675
Author(s):  
Yang Ren ◽  
Haiyan He ◽  
Yunwei Wang ◽  
Ying Gong ◽  
Gaoyang Zhao
Keyword(s):  
Sol Gel ◽  
Tio2 Films ◽  
Gel Method ◽  
Sol Gel Method ◽  
Transparent Conducting ◽  
Co Doped
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