Influence of calcination ambient and film thickness on the optical and structural properties of sol–gel TiO2 thin films

Sreemany, Monjoy; Sen, Shrabanee

doi:10.1016/j.materresbull.2006.04.033

Cited by 38 publications

(22 citation statements)

References 19 publications

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“…It may be explained in term of the existence of more amounts of defects and other contaminations through the films which results in more scattering. Generally speaking, scattering of transmission light is caused by the surface and volume defects [11]. In the 3 min sputtered films, the spectra also have been affected by the annealing temperature.…”

Section: Uv-vis Analysismentioning

confidence: 99%

“…DC magnetron sputtering oxidation of Ti ultra-thin films, in comparison with other TiO 2 thin film production methods, such as sol-gel, ion-assisted deposition and chemical vapor deposition, is a method with more efficiency and flexibility. The various oxidizing temperatures of the Ti films, result in structures with different stoichiometry or crystallinity [8,[11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of processing conditions on the physico-chemical characteristics of titanium dioxide ultra-thin films deposited by DC magnetron sputtering

Sefideh

Sadeghian²,

Nemati

et al. 2015

Ceramics International

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Section: Uv-vis Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of processing conditions on the physico-chemical characteristics of titanium dioxide ultra-thin films deposited by DC magnetron sputtering

Sefideh

Sadeghian²,

Nemati

et al. 2015

Ceramics International

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“…12 In particular, sol-gel is an attractive method because of the capability to coat materials with various shapes and ease of control over the composition of the films with relatively simple and inexpensive equipment. There is little work reported on the effect of calcination temperature 15,18,19 and environment 20 on the structural and photocatalytic properties of TiO 2 films prepared by wet chemical methods. On the other hand, morphology and the mechanical stability of the films are almost entirely determined by the postdeposition thermal treatment, or calcination.…”

Section: Introductionmentioning

confidence: 99%

Effect of Calcination Temperature and Environment on Photocatalytic and Mechanical Properties of Ultrathin Sol-Gel Titanium Dioxide Films

Kurtoglu

Longenbach

Reddington

et al. 2010

Journal of the American Ceramic Society

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Effects of calcination environment (air and nitrogen) and temperature (400°–1000°C) on the structure, optical, photocatalytic, and mechanical properties of ultrathin sol–gel titanium dioxide (TiO2) films were studied. X‐ray diffraction and Raman analysis of the films have shown preferred rutile formation at high calcination temperatures and low oxygen pressures. Films calcined under nitrogen flow were optically absorbing and contained significant amounts of carbon due to the carbonization of the organic precursor, which also resulted in a porous structure. Although photocatalytic activity of the films calcined in different atmospheres showed similar temperature dependencies, nitrogen‐calcined films performed better at high calcination temperatures and showed improved visible light activity. On the other hand, the mechanical properties of films calcined in air were superior to those calcined under nitrogen.

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“…The conduction bandedge of the TiO 2 shift is most likely the result of the variation in the apparent crystallite size of the anatase film. 40 To examine the device performance, the photocurrent-voltage characteristics for the DSC using a TiO 2 nanorod electrode as a function of the calcination temperature are measured, as shown in Fig. 7.…”

Section: Resultsmentioning

confidence: 99%

Effect of Heat-Treatment on Electron Transport Process in TiO[sub 2] Nanotube Arrays Prepared Through Liquid Phase Deposition for Dye-Sensitized Solar Cells

Charoensirithavorn

Ogomi

Sagawa

et al. 2009

J. Electrochem. Soc.

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Nanotube arrays of TiO 2 were synthesized by using a template of ZnO nanorod arrays on fluorine-doped SnO 2 transparent conducting oxide glass substrate by liquid phase deposition method. Dye N719-sensitized photoelectrochemical cells comprising TiO 2 nanotube arrays were fabricated and characterized. With an increase in the calcination temperature, the anatase content of the crystallized film increased and the conduction band of TiO 2 shifted toward a negative potential, resulting in an increase in the cell performance in terms of the short-circuit photocurrent density and open-circuit voltage.The solar cell is one of the most promising tools for the utilization of solar power as renewable energy because it has the potential for solving environmental problems and insufficient energy problems. Since O'Regan and Grätzel reported on dye-sensitized solar cells ͑DSCs͒ based on a nanocrystalline porous TiO 2 electrode in 1991, 1 DSCs were studied as a type of solar cell and were expected to be a low cost alternative to conventional solid-state devices. The cells consist of a dye-adsorbed mesoporous metal-oxide film filled with an iodide/tri-iodide redox electrolyte and a Pt counter electrode. The mesoporous metal-oxide film, typically constructed using a thick film ͑ϳ10 m͒ of TiO 2 or, less often, SnO 2 or ZnO nanoparticles with a large surface area, plays a crucial role in the high performance of DSCs. 2-4 Such nanoparticles of metal oxide not only adsorb many dye molecules for efficient light harvesting but also serve as a semiconductor to provide a pathway for electron percolation through the film. The slow percolation of electrons through an amorphous network is one of the major factors limiting further improvement in the photoconversion efficiencies achievable with nanocrystalline DSCs. 5 The arrangement of the ordered titania nanotube array attached perpendicular to the surface permits facile charge transfer along the length of the nanotubes from the solution to the conductive substrate, thereby reducing the losses incurred by charge hopping across the nanoparticle grain boundaries. 6 Easier access to the nanotube array surface, as well as better control of the interface, makes this morphology desirable for DSCs. 5-8 Recently, Shankar et al. applied high ordered TiO 2 nanotube arrays made by the anodization of a titanium film sensitized with a donor-antenna dye to DSCs and achieved 6.1% photon-to-current conversion efficiency. 9 Titania nanotubes and nanotube arrays have been produced by a variety of methods including deposition into a nanoporous alumina template, 9-12 sol-gel transcription using organogelators as templates, 13,14 seeded growth, 15 and hydrothermal processes. [16][17][18] Of these nanotube fabrication routes, the architecture demonstrating by far the most remarkable properties are highly ordered nanotube arrays made by the anodization of titanium in fluoride-based baths, 19-25 the dimensions of which can be precisely controlled. However, DSCs fabricated with titania nanotube arrays made by anodi...

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Influence of calcination ambient and film thickness on the optical and structural properties of sol–gel TiO2 thin films

Cited by 38 publications

References 19 publications

Effects of processing conditions on the physico-chemical characteristics of titanium dioxide ultra-thin films deposited by DC magnetron sputtering

Effects of processing conditions on the physico-chemical characteristics of titanium dioxide ultra-thin films deposited by DC magnetron sputtering

Effect of Calcination Temperature and Environment on Photocatalytic and Mechanical Properties of Ultrathin Sol-Gel Titanium Dioxide Films

Effect of Heat-Treatment on Electron Transport Process in TiO[sub 2] Nanotube Arrays Prepared Through Liquid Phase Deposition for Dye-Sensitized Solar Cells

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