Spray pyrolysis deposition and characterization of titanium oxide thin films

Castañeda, L.; Alonso, Juan Carlos; Ortíz, A.; Andrade, E.; Saniger, J.M.; Bañuelos, J.G.

doi:10.1016/s0254-0584(02)00193-1

Cited by 92 publications

(40 citation statements)

References 29 publications

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“…The decrease in the optical band gap of TiO 2 films with annealing temperature might be the results of the change in film density and increase in grain size with decrease in strain of the film [12,20]. This result is consistent with previous studies [2,5,8,[10][11][12]21].…”

Section: Optical Characterizationsupporting

confidence: 90%

Effect of Annealing Temperature on the Structure, optical and Electronic Properties of \(\text{TiO}_{2}\) Made by Thermal Treatment of \(\text{Ti}\)

Chien¹,

Long²

2014

Comm. Phys.

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Abstract. In this work, TiO2 nanocrystalline thin films were obtained through evaporating Ti films by Electron Beam Deposition (EBD) followed by thermal treatment. The deposition speed of Ti thin fims was carried out at 0.15 nm/s and 1 nm/s. The results show that after annealing at 450˚C for 8 h, the obtained TiO2 thin films have nanoparticle structure with grain size of 20 nm for the Ti thin film deposited at the rate of 1nm/s, whereas at the a deposition rate of 0.15 nm/s, the TiO2 has a nanorod structure with the rod length of 300 -400 nm. The influence of thermal annealing on structure of TiO2 films have been investigated and indicated that when annealed at 450˚C for 8 hours, all the Ti films were completely oxidized to form TiO2 films with anatase phase. Whereas, at 700˚C the rutile phase was formed. The band gap of TiO2 thin films decreased with annealing temperature in both doposition rate of Ti thin films. The response of the films annealed at 450˚C presented a faster rise and fall in photocurrent under UV illumination on and off interval. Nanoporous structure TiO2 shows photoelectronic property better than that of nanorod structure. The TiO2 films were used in a photo-electrochemical (PEC) cell as a working electrode and a platinum electrode as a counter electrode. The electrolyte solution contains 1 M KCl and 0.1 M Na2S.

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Section: Optical Characterizationsupporting

confidence: 90%

Effect of Annealing Temperature on the Structure, optical and Electronic Properties of \(\text{TiO}_{2}\) Made by Thermal Treatment of \(\text{Ti}\)

Chien¹,

Long²

2014

Comm. Phys.

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“…Crystalline titanium dioxide (TiO 2 ) occurs in three different structures: rutile (tetragonal), anatase (tetragonal), and brookite (orthorhombic) (Castañeda et al, 2002;Su et al, 2006a;Wang et al, 2007). The anatase and rutile forms have been extensively studied and, as semiconductors, are used for a variety of applications (Hidalgo et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…The anatase form appears to be the most active form of these two phases (Kabra et al, 2004;Linsebigler et al, 1995). Anatase is a metastable phase that can be converted to rutile when heated at high temperatures (> 600ºC) (Castañeda et al, 2002). In addition to providing an excellent thermal stability, high photosensitivity (Ho and Yu, 2006;Venkatachalam et al, 2007) and high photoreactivity, as a chemically inert, nontoxic and relatively low-cost material, TiO 2 has been used in many industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Temperature and reaction time effects on the structural properties of titanium dioxide nanopowders obtained via the hydrothermal method

Jahn

Carreño

Foletto

2011

Braz. J. Chem. Eng.

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-An investigation was carried out on the synthesis of titanium dioxide nanopowders via the hydrothermal method, examining the influence of temperature (150ºC and 200ºC) and reaction time (6 to 36 h). The resulting powders were characterized by X-ray diffraction, infrared absorption spectrophotometry, transmission electron micrographs and surface area. The X-ray diffraction revealed that there was formation of a pure crystalline phase, consisting only of anatase for all conditions of synthesis. Both temperature and reaction time proved to have a slight influence on the crystallite size (from 9 to 17 nm) and a significant influence on the surface area (from 86 to 168 m 2 .g -1 ).

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“…13,15,27 Similarly, Castañeda et al 28 reported that the rutile phase is formed at high temperatures and the anatase phase is formed at lower temperatures (about 450 ºC).…”

Section: X-ray Diffractionmentioning

confidence: 97%

Analytical methods in photoelectrochemical treatment of phenol

Lopes¹,

Montagnolli²,

Bidóia³

2011

J. Braz. Chem. Soc.

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O presente estudo visou o tratamento de efluente simulado, contendo fenol por processos fotocatalítico e fotolítico com análise toxicológica das soluções fenólicas. Dois sistemas de tratamento foram propostos com radiação UV, eletrodos maciços e potencial elétrico. No primeiro sistema (S1), a concentração de fenol foi determinada por espectrofotometria direta em 269 nm e o segundo (S2) por meio do método fotométrico direto (4-aminoantipirina). Testes de toxicidade foram realizados com dois microrganismos: Escherichia coli e Saccharomyces cerevisiae. Os resultados de S1 demonstraram que conclusões errôneas podem ser retiradas em relação ao aumento de absorbância no pico do fenol de acordo com o tempo de tratamento. Contudo, o método fotométrico direto foi capaz de identificar a redução do fenol em S2 e observou-se que os tratamentos propostos degradaram as moléculas de fenol em solução. Também, no tratamento com fonte ultravioleta de alta energia (UVC), a degradação fenólica deve-se principalmente à fotólise.The aim of the study was to propose a treatment of simulated wastewater containing phenol by photocatalytic and photolytic processes and analyze the toxicity of these phenolic solutions. Two treatment systems were performed with UV radiation, solid electrodes and electric potential. In the first system (S1) phenol concentration was determined by UV direct spectrophotometry (269 nm) and in the second (S2) by direct photometric method (4-aminoantipyrine). Toxicological tests were carried out using two microorganisms: Escherichia coli and Saccharomyces cerevisiae. S1 results showed that erroneous conclusions can be drawn by absorbance values increase at phenol peak. Nevertheless, direct photometric method was able to identify phenol reduction in S2 and the proposed treatments degraded phenol in solution. Also, in treatment using high energy ultraviolet radiation (UVC), the phenol degradation was mainly due to the photolytic process.

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Spray pyrolysis deposition and characterization of titanium oxide thin films

Cited by 92 publications

References 29 publications

Effect of Annealing Temperature on the Structure, optical and Electronic Properties of \(\text{TiO}_{2}\) Made by Thermal Treatment of \(\text{Ti}\)

Effect of Annealing Temperature on the Structure, optical and Electronic Properties of \(\text{TiO}_{2}\) Made by Thermal Treatment of \(\text{Ti}\)

Temperature and reaction time effects on the structural properties of titanium dioxide nanopowders obtained via the hydrothermal method

Analytical methods in photoelectrochemical treatment of phenol

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