Size and Morphology Control of Gallium Oxide Hydroxide GaO(OH), Nano- to Micro-Sized Particles by Soft-Chemistry Route without Surfactant

Zhao, Yanyan; Frost, Ray L.; Yang, Jing; Martens, Wayde N.

doi:10.1021/jp710545p

Cited by 91 publications

(88 citation statements)

References 31 publications

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“…Zhao and Frost realized the morphology-controllable synthesis of GaOOH with hydrothermal treatment. 22 To the best of our knowledge, no information about the dependence of Ga 2 O 3 polymorphs formation on the GaOOH precursors was reported in the literatures.…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted synthesis of various gallium oxyhydroxide nanorods and their controllable conversion into different gallium oxide polymorphs

Zhang

Jia

et al. 2009

J. Mater. Res.

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Various a-GaOOH nanorods were synthesized through a microwave-assisted method at 80 C. In the synthesis, Ga(NO 3 ) 3 was used as the gallium source, and urea, L-cysteine, and EDTA disodium salt were used as the additives. The thermal decomposition of the as-prepared a-GaOOH nanorods could selectively produce a-, b-, and e-Ga 2 O 3 nanorods. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, and cathodoluminescence were used to characterize the resulting samples. On the basis of characterization results, the possible growth mechanisms of these various GaOOH nanorods were proposed. This study provides a controllable method to prepare various gallium oxyhydroxide and gallium oxide nanorods.

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Section: Introductionmentioning

confidence: 99%

Microwave-assisted synthesis of various gallium oxyhydroxide nanorods and their controllable conversion into different gallium oxide polymorphs

Zhang

Jia

et al. 2009

J. Mater. Res.

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“…Numerous studies have been conducted on the synthesis and characterization of one-dimensional (1D) and two-dimensional (2D) β -Ga 2 O 3 [11,12,13] mainly via chemical reaction-based approaches such as hydrolysis, sol–gel methods, electrospinning, and the hydrothermal method [14,15,16,17,18,19,20]. Among these various methods, β -Ga 2 O 3 prepared via the hydrothermal method has been popular due to the resulting high crystallinity [21,22,23,24,25,26]. Furthermore, the hydrothermal method allows the formed β -Ga 2 O 3 to have different faces of nanorods and/or nanoparticles, resulting in different surface area to volume ratios and/or aspect ratios.…”

Section: Introductionmentioning

confidence: 99%

High-Aspect Ratio β-Ga2O3 Nanorods via Hydrothermal Synthesis

et al. 2018

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High-aspect ratio β-Ga2O3 nanorods consisting of prism-like crystals were formed using gallium oxyhydroxide and ammonia hydroxide via a hydrothermal synthesis followed by the subsequent calcination process. The formation of high-aspect ratio β-Ga2O3 nanorods was attributed to the oriented attachment mechanism that was present during the hydrothermal synthesis. A field-effect transistor was fabricated using the high-aspect ratio β-Ga2O3 nanorod, and it exhibited the typical charge transfer properties of an n-type semiconductor. This facile approach to forming high-aspect ratio nanorods without any surfactants or additives can broaden the science of β-Ga2O3 and expedite the integration of one-dimensional β-Ga2O3 into future electronics, sensors, and optoelectronics.

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“…Ga 2 O 3 nanostructures have a high surface area-to-volume ratio. There are several synthetic approaches to prepare these nanostructures such as laser ablation [20,21], molecular beam epitaxy [22], chemical vapor deposition [23][24][25], hydrothermal treatment [26][27][28][29] and plasma-assisted growth methods [30]. Ga 2 O 3 synthesis, in the liquid phase, is usually preceded by GaOOH formation that leads, finally, to Ga 2 O 3 crystals.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Nanostructure of Gallium Oxide Catalysts on Conversion in the Green Synthesis of Carbamates

Shah

Ratnasamy²,

Carreon

2017

Catalysts

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Abstract:The nanostructure of β-gallium oxide crystals influences the conversion to carbamates; specifically, for the synthesis of alkyl carbamates (like propyl N-octylcarbamate) from CO 2 and n-propanol in the absence of phosgene. The nanostructures with variable aspect ratios (length (L)/width (D); from 2 to 18) were prepared by the controlled addition of neutral and cationic surfactants during gallium oxide synthesis. These catalysts displayed selectivities to the corresponding carbamates as high as~70%, superior to non-nanostructured Ga 2 O 3 catalysts. The conversion was found to be inversely proportional to the square of the relative crystallinity. The catalysts retained their structure and catalytic performance upon recycling.

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Size and Morphology Control of Gallium Oxide Hydroxide GaO(OH), Nano- to Micro-Sized Particles by Soft-Chemistry Route without Surfactant

Cited by 91 publications

References 31 publications

Microwave-assisted synthesis of various gallium oxyhydroxide nanorods and their controllable conversion into different gallium oxide polymorphs

Microwave-assisted synthesis of various gallium oxyhydroxide nanorods and their controllable conversion into different gallium oxide polymorphs

High-Aspect Ratio β-Ga2O3 Nanorods via Hydrothermal Synthesis

Influence of the Nanostructure of Gallium Oxide Catalysts on Conversion in the Green Synthesis of Carbamates

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