Annealing effects on microstructural and optical properties of Nanostructured-TiO2 thin films prepared by sol–gel technique

Naceur, J. Ben; Gaidi, Mounir; Bousbih, F.; Mechiakh, R.; Chtourou, R.

doi:10.1016/j.cap.2011.07.041

Cited by 104 publications

(50 citation statements)

References 29 publications

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“…Conventional wet processes such as the sol-gel method can be used to produce pure-phase TiO 2 films; however, fabricating dense TiO 2 films is difficult by this method [5]. Sputtering deposition can be used to produce uniform TiO 2 thin films with a large area, high packing density and strong adhesion [1,6].…”

Section: Introductionmentioning

confidence: 99%

On the Crystal Structural Control of Sputtered TiO2 Thin Films

et al. 2016

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In this study, we focused on the origin on the selective deposition of rutile and anatase TiO 2 thin films during the sputtering process. The observation on microstructural evolution of the TiO 2 films by transmission electron microscopy revealed the coexistence of rutile and anatase TiO 2 phases in the initial stage under the preferential growth conditions for the anatase TiO 2 ; the observations further revealed that the anatase phase gradually dominated the crystal structure with increasing film thickness. These results suggest that the bombardment during the sputtering deposition did not obviously affect the TiO 2 crystal structure, and this was also confirmed by off-axis magnetron sputtering experiments. We also investigated the mechanism of the effect of Sn impurity doping on the crystal structure using first-principles calculations. It is found that the formation energy of Sn-doped rutile TiO 2 is lower than that of Sn-doped anatase TiO 2 ; this suggests that the Sn-doped TiO 2 favours the rutile phase. These results offer a guideline for the utilization of selective deposition of rutile and anatase TiO 2 thin films in various industrial applications.

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Section: Introductionmentioning

confidence: 99%

On the Crystal Structural Control of Sputtered TiO2 Thin Films

et al. 2016

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“…Existem três tipos de polimorfos no óxido de titânio: o rutilo, a anatase e a brookita; os dois últimos apresentam menor utilização comercial [1,3,4]. Os principais usos estão em tintas e revestimentos (57%), plásticos (24%), papéis e tintas de impressão (13%).…”

Section: Introductionunclassified

Superfícies fotocatalíticas de titânia em substratos cerâmicos: Parte I: Síntese, estrutura e fotoatividade

et al. 2013

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ResumoA fotocatálise é um processo de oxidação avançada capaz de transformar uma grande variedade de poluentes orgânicos tóxicos em substâncias inofensivas em condições ambientes. Porém, a utilização do dióxido de titânio na fase anatase em produtos cerâmicos é limitada devido à transformação para fase rutilo em temperaturas superiores a 400 °C. As pesquisas apontam caminhos promissores para inibir a formação da fase rutilo através da introdução de dopantes na estrutura do semicondutor. Neste trabalho, foi realizada uma revisão dos principais aspectos encontrados na literatura especializada sobre fotocatálise com dióxido de titânio, em particular a relação entre estrutura química e atividade fotocatalítica. Palavras-chave: fotocatálise, dióxido de titânio, superfícies cerâmicas. Abstract Photocatalysis has been considered as an advanced oxidation process capable of transforming a large variety of toxic organic

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“…The shape and density of the nanocrystalline structure of the films were found to depend on the annealing temperature. It was reported that the crystalline phase of the films changed from anatase to rutile after annealing at 1273 K [6]. Lin et al [16] observed that the crystallite size increased whereas the band gap decreased with annealing temperature.…”

Section: Introductionmentioning

confidence: 99%

“…TiO 2 exists in rutile, anatase, and brookite phase, and its band gap varies between 3.0 eV and 3.8 eV or even higher [1][2][3][4]. In general, the rutile phase is thermodynamically more stable than the anatase one [5], and the band gap of the anatase phase is higher than the rutile one [6].…”

Section: Introductionmentioning

confidence: 99%

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Influence of annealing on X-ray radiation sensing properties of TiO2 thin film

2017

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A recent study shows that the titanium dioxide (TiO 2 ) thin film synthesised by a chemical bath deposition technique is a very useful material for the X-ray radiation sensor. In this work, we reported the influence of annealing on the X-ray radiation detection sensitivity of the TiO 2 film. The films were annealed at 333 K, 363 K, 393 K, 473 K, and 573 K for 1 hour. Structural analyses showed that the microstrain and dislocation density decreased whereas the average crystallite size increased with annealing. The band gap of the films also decreased from 3.26 eV to 3.10 eV after annealing. The I-V characteristics record under the dark condition and under the X-ray irradiation showed that the conductivity increased with annealing. The influence of annealing on the detection sensitivity was negligible if the bias voltage applied across the films was low (within 0.2 V -1.0 V). At higher bias voltage (>1.0 V), the contribution of electrons excited by X-ray became less significant which affected the detection sensitivity.

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Annealing effects on microstructural and optical properties of Nanostructured-TiO2 thin films prepared by sol–gel technique

Cited by 104 publications

References 29 publications

On the Crystal Structural Control of Sputtered TiO2 Thin Films

On the Crystal Structural Control of Sputtered TiO2 Thin Films

Superfícies fotocatalíticas de titânia em substratos cerâmicos: Parte I: Síntese, estrutura e fotoatividade

Influence of annealing on X-ray radiation sensing properties of TiO2 thin film

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