Abstract
Morphology controlledα-GaO(OH) particles have been synthesized via precipitation method which allows the tuning of relative growth rates of crystal facets. The effects of alkali addition rate and the type of alkali on the growth rates of the crystal facets during hydrolysis were also investigated. XRD and TG analysis confirmed that there was a phase transition from GaO(OH) to Ga2O3when precursor sample was calcined to 750°C. The single phaseα-Ga2O3was obtained after thermal treatment of NaOH precipitated precursor, whileβ-Ga2O3was formed when the urea or NH4OH precipitated precursor was calcinated. Furthermore, the thermal, spectral, and photocatalytic properties connected to the crystal structure and morphology were discussed.
Highlights
Wide band gap transparent conductive oxides (TCO) attracted great attention due to their applicability in diverse fields from catalysis to biotechnology
All α-GaO(OH) nanoparticles prepared by hydrolysis with urea, NH4OH, and NaOH displayed similar behaviour
Low photocatalytic activity of α-GaOOH was probably originated by its large band gap energy
Summary
Wide band gap transparent conductive oxides (TCO) attracted great attention due to their applicability in diverse fields from catalysis to biotechnology. ITO conventional TCO electrode is opaque in the deep UV region (∼300 nm) due to its small band gap energy (∼3.2 eV) while wide band gap semiconducting oxide such as Ga2O3 with a band gap of 4.8–4.9 eV is transparent to deep UV light. Ga2O3 as a new TCO electrode can play a major role in increasing the performance of many optoelectronic devices. Orita et al reported Ga2O3 to be the best candidate for a new TCO, because it shows high transmittance to deep UV, presents controlled electrical conductivity, and is thermally stable even when applied to high voltage [4]. Hou et al reported that Ga2O3 when used as a catalyst over benzene presents a better photocatalytic property than that of commercial
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