Effect of scandium on the structural and photocatalytic properties of titanium dioxide thin films

Cavalheiro, Alberto Adriano; Bruno, J. C.; Saeki, Margarida Júri; Valente, José Pedro Serra; Florentino, Ariovaldo O.

doi:10.1007/s10853-007-1743-2

Cited by 32 publications

(30 citation statements)

References 16 publications

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“…Such coatings have also attracted great interest in terms of the potential for practical application offered by their antimicrobial and antifouling properties 8,9) , as titanium dioxide (TiO2) induces oxidization on excitation by ultraviolet irradiation [10][11][12] . In dentistry, these properties are particularly useful, as dentures require clean surfaces [13][14][15][16][17] .…”

Section: Introductionmentioning

confidence: 99%

“…The adhesion of a TiO2 coating to a substrate needs to be reliable longterm if it is to be applied to dentures. Durability against friction caused by brushing is of particular importance 8,9,18,22) . However, to the author's knowledge, no studies have investigated the durability of a TiO2 coating on a PMMA substrate under a frictionsimulating brushing process.…”

Section: Introductionmentioning

confidence: 99%

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Improved brushing durability of titanium dioxide coating on polymethyl methacrylate substrate by prior treatment with acryloxypropyl trimethoxysilane-based agent for denture application

et al. 2010

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The purpose of this study was to determine whether the brushing durability of a titanium dioxide coating on a polymethyl methacrylate (PMMA) substrate was improved by prior treatment with an acryloxypropyl trimethoxysilane-based agent. Titanium dioxide coatings were obtained by spray-coating substrates with or without prior treatment. Structure was investigated using IR, SEM, and an EPMA. Effect on durability against brushing was determined with a brush-wear test machine utilizing a commercial denture brush.A thin layer comprised of siloxane and TiO2 was formed on a PMMA substrate by prior treatment with an acryloxypropyl trimethoxysilane-based agent and spray-coating of TiO2. Prior treatment demonstrated improved stability against brushing, whereas the titanium coating was removed after less than 1×10 5 brushing cycles without prior treatment. This suggests that prior treatment with an acryloxypropyl trimethoxysilane-based agent would confer improved durability against brushing-induced stress on a TiO2 coating in its application to dentures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved brushing durability of titanium dioxide coating on polymethyl methacrylate substrate by prior treatment with acryloxypropyl trimethoxysilane-based agent for denture application

et al. 2010

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“…The synthesis of new materials based on TiO 2 has resulted in substantial progress towards the improvement of the photocatalytic activity of this semiconductor (Imhof & Pine, 1997;Cavalheiro et al,2008;Eguchi et al, 2001;Agostiano et al, 2004;Machado et al, 2008;Zaleska et al, 2010;Batista, 2010;Machado et al, 2011b).…”

Section: Heterogeneous Photocatalysismentioning

confidence: 99%

“…Doping or incorporate trace impurities in the structure of TiO 2 in order to obtain materials with photocatalytic activity maximized in the visible region are strategies widely used (Ohno et al, 2003;Li et al, 2005;Zaleska et al, 2010). These strategies include doping with transition metals (Nogueira & Jardim, 1998;Yamashita et al, 2001;Cavalheiro et al, 2008;Zaleska et al, 2010), nonmetals (Ohno et al, 2003;Li et al, 2005), and the inclusion of low-valence íons on the surface of the semiconductor (for example, Ag + , Ni 3+ , V 3+ e Sc 3+ ). Certain metals, when incorporated to titanium dioxide, are able to decrease the band gap, making possible in some cases its application in solar photocatalysis.…”

Section: Changes In the Structure And Surface Of Titanium Dioxidementioning

confidence: 99%

Potential Applications for Solar Photocatalysis: From Environmental Remediation to Energy Conversion

Machado¹,

Santos²,

Borges³

et al. 2012

Solar Radiation

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“…But, the characteristic of the titanium dioxide semiconductor is the most important factor to be considered, including the morphology, composition and crystalline structure [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Structural Aspects of Anatase to Rutile Phase Transition in Titanium Dioxide Powders Elucidated by the Rietveld Method

Cavalheiro¹,

Oliveira²,

Santos³

2017

Titanium Dioxide

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Titanium dioxide has attracted much attention since a long time ago due to its versatility as advanced material. However, its performance as semiconductor devices is very much dependent on the predominant crystalline phase and defect concentrations, which can be adjusted through the synthesis methods, thermal treatments and doping processes. In this work, an accurate structural characterization of titanium dioxide was used by X-ray diffractometry supported by rietveld refinement and thermal analysis. The insertion of 5 mol% of zirconium silicate was able to stabilize anatase up to 900 C, permitting the oxygen vacancies to be significantly eliminated. It was demonstrated also that the changes in the isotropic thermal parameters for oxygen are related to reconstructive transformation necessary to promote the anatase-to-rutile phase transition. Independently of doping process, the crystallization process of anatase phase as a function of temperature increasing occurs exclusively due the reduction of lattice microstrain up to 600 C. However, above 650 C, that crystallization process becomes dependent of the increasing in crystallite size. The anatase crystallite growth event was only possible when the titanium dioxide was doped with zirconium silicate. Otherwise, the rutile phase amount starts to rise continually. Thus, there are optimistic expectations for that new composition to be a new semiconductor matrix for additional doping processes.

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Effect of scandium on the structural and photocatalytic properties of titanium dioxide thin films

Cited by 32 publications

References 16 publications

Improved brushing durability of titanium dioxide coating on polymethyl methacrylate substrate by prior treatment with acryloxypropyl trimethoxysilane-based agent for denture application

Improved brushing durability of titanium dioxide coating on polymethyl methacrylate substrate by prior treatment with acryloxypropyl trimethoxysilane-based agent for denture application

Potential Applications for Solar Photocatalysis: From Environmental Remediation to Energy Conversion

Structural Aspects of Anatase to Rutile Phase Transition in Titanium Dioxide Powders Elucidated by the Rietveld Method

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