Anatase thin films by ultrasonic spray pyrolysis

Nakaruk, Auppatham; Ragazzon, Davide; Sorrell, Charles Christopher

doi:10.1016/j.jaap.2010.03.001

Cited by 19 publications

(12 citation statements)

References 38 publications

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“…The lms deposited via doctor blade, spray pyrolysis, and sputtering signicantly reduced the transparency of the glass window and were then abandoned. 16,[21][22][23] Moreover, the lm deposited via doctor blade also showed weak adhesion to the glass substrate. Spin coating technique showed the best results in terms of both transparency and adherence.…”

Section: Resultsmentioning

confidence: 99%

TiO₂-coated window for facilitated gas evolution in PEC solar water splitting

et al. 2017

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Photoelectrochemical (PEC) cells for water splitting generally have a transparent front window for the sunlight to reach the surface of the photoelectrode or tandem photoelectrode. The overall efficiency of a PEC system for solar hydrogen production is strongly affected by the evolved gases that get trapped in the front window. This negative effect is clearly observed when the PEC cells are placed in tilted positions to maximize light harvesting. Titanium dioxide coatings become superhydrophilic when exposed to UV light, facilitating the gas bubbles to slip up. The present study focuses on the development of a thin TiO 2 coating to minimize the adhesion of the evolved bubbles in the front window of PEC cells, thereby maximizing its transparency. Highly transparent, crack-free, and stable thin films of TiO 2 were prepared by spin coating followed by sintering at 465 C for 45 min. A water contact angle (WCA) of 0 was obtained after irradiating the surface of the sample for 30 min with UV-light (365 nm, 2 W m À2), confirming the superhydrophilic behaviour. The irradiance loss during the evolution of H 2 /O 2 was assessed using a silicon PV cell; the cell, tilted at 45 and equipped with a TiO 2 -coated glass window, showed ca. 10% higher irradiance as compared to the uncoated glass window cell for both hydrogen and oxygen evolutions, whereas no significant differences were observed when the cells were vertically placed.

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Section: Resultsmentioning

confidence: 99%

TiO₂-coated window for facilitated gas evolution in PEC solar water splitting

et al. 2017

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“…Moreover, the absorption edge shied towards longer wavelengths (red shi). e increase in the thickness and light scattering from pores/cracks are responsible for the observed decrease of the transmission spectra [16][17][18].…”

Section: Methodsmentioning

confidence: 97%

Cerium Dioxide Thin Films Using Spin Coating

Channei

Nakaruk

Phanichphant

et al. 2012

Journal of Chemistry

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Cerium dioxide (CeO 2 ) thin �lms with varying Ce concentrations (0.1 to 0.9 M, metal basis) were deposited on soda-lime-silica glass substrates using spin coating. It was found that all �lms exhibited the cubic �uorite structure a�er annealing at 500 ∘ C for 5 h. e laser Raman microspectroscopy and GAXRD analyses revealed that increasing concentrations of Ce resulted in an increase in the degree of crystallinity. FI� and FESEM images con�rmed the laser Raman and GAXRD analyses results owing to the predicted increase in �lm thickness with increasing Ce concentration. However, porosity and shrinkage (drying) cracking of the �lms also increased signi�cantly with increasing Ce concentrations. UV-VIS spectrophotometry data showed that the transmission of the �lms decreased with increasing Ce concentrations due to the increasing crack formation. Furthermore, a red shi� was observed with increasing Ce concentrations, which resulted in a decrease in the optical indirect band gap.

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“…Depending on the annealing temperature resulting film was transparent to near infrared light, and streak to visible region owing to the degree of homogeneity and microstructure of the film. 20,21 The mineralogy of the films was examined using laser Raman microspectroscopy (Renishaw in via, with excitation source of 514 nm (green) argon ion laser integrated with an optical microscope). Minimum laser spot size was around 3 m which is ideal for identification and structural studies of most mineral and inorganic samples.…”

Section: Methodsmentioning

confidence: 99%