Cerium Dioxide Thin Films Using Spin Coating

Abstract

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.

Aqueous and Surface Chemistries of Photocatalytic Fe-Doped CeO2 Nanoparticles

“…When exposed to water, this solid surface has been shown to reduce from Ce 4+ (CeO 2 ) to Ce 3+ (CeO 2−x ) [23][24][25], with the consequent formation of oxygen vacancies [26][27][28][29][30][31]. The adsorption location is normally on the (111) plane [32], where the reduction occurs according to Equation (1) or, in ionic terms:…”

“…Ceria (CeO 2 ) is well known as a photocatalyst and Fe doping of CeO 2 improves its photocatalytic performance [1][2][3][4]. However, it is less well known that, in common with many rare earth oxides [5,6], CeO 2 is hygroscopic and hence water can be absorbed upon exposure to atmospheric water vapor.…”

The influence of substrate temperature on the optical and micro structural properties of cerium oxide thin films deposited by RF sputtering

“…Several methods have been proposed to prepare CeO 2 thin films such as molecular beam epitaxy (MBE) [13], chemical vapor deposition (CVD) [14], pulsed laser deposition [15], dip coating [16], spray pyrolysis [17], spin coating [18] and radio frequency (RF) magnetron sputtering [19]. Among these techniques RF sputtering method has many attractive advantages which include better film growth control, repeatability, low temperature deposition, large scale stability and uniform film properties.…”

Photophysics of photothermal activation of plasmonic nanostructures

“…35 The response of plasmonic nanoparticles has been well studied, from transient processes in ensemble measurements, to the formation of breathing modes due to heating in single nanocubes. 67,68 Disambiguation of charge and resonance energy transfer by TA is possible, as both processes have a distinct spectral fingerprint. Further, the mechanism of charge Figure 4: A) Scheme of the TA setup, the wavelength of the pump is controlled by the optical parametric amplifier (OPA) and a probe pulse is delayed and then used to generate white light to determine the spectra of the sample in time relative to the pump.…”

“…Synthesis of cerium praseodymium oxide (CPO) was done through a modification of established spin-coat sol-gel methods. 67,68 In brief, a solution of methanol containing 0.06 M (Ce(NO3)3 + Pr(NO3)3) and 0.5 M citric acid was prepared, and allowed to age at room temperature for not less than 48 hours; after which a pale yellow-green colour was observed. This solution was then used as is, and 0.2 mL was placed on 10x30x2 mm quartz substrates and spun at 3500 RPM for 15 seconds.…”