An ESR study on the photoreactivity of tio2 pigments

Ceresa, Emiliano Mello; Burlamacchi, L.; Visca, M.

doi:10.1007/bf00543837

Cited by 50 publications

(14 citation statements)

References 17 publications

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“…However, they require a certain level of expertise and equipment. The same limitation holds for other methods that have been proposed such as photoconductivity measurements [21], the evaluation of CO 2 from an enclosed paint film [22], ESR analysis [23] and full characterization of the pigment. Finally, accelerated aging tests are a valuable tool in the field of paint development.…”

Section: Photocatalysismentioning

confidence: 94%

A quick assessment of the photocatalytic activity of TiO2 pigments — From lab to conservation studio!

Driel

Kooyman

Berg

et al. 2016

Microchemical Journal

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Titanium dioxide is the most abundantly used white pigment of the 20th century. The pigment is still in use, both in the production of contemporary art and for the conservation of older artwork as a retouching pigment. Unfortunately, next to its positive characteristics, the pigment has one major potential drawback: its photocatalytic activity that can cause degradation of artworks in which it is used. In this paper, we report on a new method to test the photocatalytic activity of different quality grades of titanium dioxide white pigments. This can be done quantitatively in a chemical lab or qualitatively in a quick and easy way, in a museum or artists' studio, with limited use of lab equipment. The photocatalytic degradation of an organic dye, acid blue 9, in an aqueous solution containing titanium dioxide, is followed over time by means of UV-Vis spectrophotometry. Dye solutions containing pigments with high photocatalytic activity lose their color within several hours of UVA exposure. On the other hand, dye solutions containing UV-stable titanium dioxide do not degrade within 24 h of UVA exposure. Insight in the photocatalytic activity of titanium white pigments, which can be obtained with this novel test, is of great importance for preventive conservation of modern art.

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Section: Photocatalysismentioning

confidence: 94%

A quick assessment of the photocatalytic activity of TiO2 pigments — From lab to conservation studio!

Driel

Kooyman

Berg

et al. 2016

Microchemical Journal

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“…in aqueous solutions of illuminated TiO2 (44,45). While the radicalspin trap complex is detected in the liquid phase, it is not possible to distinguish whether the actual trapping reaction occurs on the semiconductor surface or in solution.…”

Section: Evidence For Oh As the Primary Oxidantmentioning

confidence: 99%

“…is clearly produced by reaction at the photocatalyst surface, it may desorb and react in the fluid phase (44,46,51,52).…”

Section: Evidence For Oh As the Primary Oxidantmentioning

confidence: 99%

Photocatalytic degradation of organic water contaminants: Mechanisms involving hydroxyl radical attack

Turchi

Ollis

1990

Journal of Catalysis

1,958

876

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“…21 anti-reflection coating, 21 white pigment in paints, 22 gas sensors, 23 etc. Recently, the application base for TiO 2 has been growing rapidly, in particular due to its promising properties at nanoscale.…”

Section: Introductionmentioning

confidence: 99%

Interfacial band alignment and structural properties of nanoscale TiO2 thin films for integration with epitaxial crystallographic oriented germanium

Jain

Zhu

Maurya

et al. 2014

Journal of Applied Physics

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We have investigated the structural and band alignment properties of nanoscale titanium dioxide (TiO 2 ) thin films deposited on epitaxial crystallographic oriented Ge layers grown on (100), (110), and (111)A GaAs substrates by molecular beam epitaxy. The TiO 2 thin films deposited at low temperature by physical vapor deposition were found to be amorphous in nature, and high-resolution transmission electron microscopy confirmed a sharp heterointerface between the TiO 2 thin film and the epitaxially grown Ge with no traceable interfacial layer. A comprehensive assessment on the effect of substrate orientation on the band alignment at the TiO 2 /Ge heterointerface is presented by utilizing x-ray photoelectron spectroscopy and spectroscopic ellipsometry. A band-gap of 3.33 6 0.02 eV was determined for the amorphous TiO 2 thin film from the Tauc plot. Irrespective of the crystallographic orientation of the epitaxial Ge layer, a sufficient valence band-offset of greater than 2 eV was obtained at the TiO 2 /Ge heterointerface while the corresponding conduction band-offsets for the aforementioned TiO 2 /Ge system were found to be smaller than 1 eV. A comparative assessment on the effect of Ge substrate orientation revealed a valence band-offset relation of DE V (100) > DE V (111) > DE V (110) and a conduction band-offset relation of DE C (110) > DE C (111) > DE C (100). These band-offset parameters are of critical importance and will provide key insight for the design and performance analysis of TiO 2 for potential high-j dielectric integration and for future metal-insulator-semiconductor contact applications with next generation of Ge based metal-oxide field-effect transistors. V C 2014 AIP Publishing LLC.

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An ESR study on the photoreactivity of tio2 pigments

Cited by 50 publications

References 17 publications

A quick assessment of the photocatalytic activity of TiO2 pigments — From lab to conservation studio!

A quick assessment of the photocatalytic activity of TiO2 pigments — From lab to conservation studio!

Photocatalytic degradation of organic water contaminants: Mechanisms involving hydroxyl radical attack

Interfacial band alignment and structural properties of nanoscale TiO2 thin films for integration with epitaxial crystallographic oriented germanium

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