Gas sensing performance of GaOOH and β-Ga2O3 synthesized by hydrothermal method: a comparison

Pilliadugula, Rekha; Krishnan, Navaneetha

doi:10.1088/2053-1591/aaede8

Cited by 20 publications

(15 citation statements)

References 27 publications

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“…Gallium oxides, which have wide bandgap ranging from 4.2 to 4.9 eV, are particularly important semiconductor materials [11,14]. The Ga 2 O 3 material can be used for various device applications, such as gas sensors [15], catalysis [16], power and high voltage electronic 2 of 9 devices [13] because it has unique conductive properties and is electrically and thermodynamically stable [17][18][19]. Various polymorphs of Ga 2 O 3 as the photocatalysts in the degradation of organic dyes have been studied previously [11,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Growth and Photocatalytic Properties of Gallium Oxide Films Using Chemical Bath Deposition

Yeh

Zhao

et al. 2019

Crystals

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Gallium oxide (Ga2O3) thin films were fabricated on glass substrates using a combination of chemical bath deposition and post-annealing process. From the field-emission scanning electron microscopy and x-ray diffraction results, the GaOOH nanorods precursors with better crystallinity can be achieved under higher concentrations (≥0.05 M) of gallium nitrate (Ga(NO3)3). It was found that the GaOOH synthesized from lower Ga(NO3)3 concentration did not transform into α-Ga2O3 among the annealing temperatures used (400–600 °C). Under higher Ga(NO3)3 concentrations (≥0.05 M) with higher annealing temperatures (≥500 °C), the GaOOH can be transformed into the Ga2O3 film successfully. An α-Ga2O3 sample synthesized in a mixed solution of 0.075 M Ga(NO3)3 and 0.5 M hexamethylenetetramine exhibited optimum crystallinity after annealing at 500 °C, where the α-Ga2O3 nanostructure film showed the highest aspect ratio of 5.23. As a result, the photodegeneration efficiencies of the α-Ga2O3 film for the methylene blue aqueous solution can reach 90%.

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Section: Introductionmentioning

confidence: 99%

Growth and Photocatalytic Properties of Gallium Oxide Films Using Chemical Bath Deposition

Yeh

Zhao

et al. 2019

Crystals

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“…Then, the solution is placed in an autoclave for reaction under relatively high pressure and moderate temperature conditions. In most cases, gallium nitrate hydrate Ga(NO 3 ) 3 • x H 2 O [ 153 , 154 , 155 , 156 , 157 , 158 , 159 , 160 , 161 , 162 ] was used as the precursor for synthetizing Ga 2 O 3 nanomaterials. The chosen solution has been always distilled water, while other organic solvent such as alcohol [ 156 , 157 ] was also used.…”

Section: Preparation Methods Of Ga 2 O 3...mentioning

confidence: 99%

“…The morphology of these Ga 2 O 3 functional nanomaterials varies from one dimensional to three-dimensional nanostructures such as nanospheres, nanoflowers, nanowires, nanorods, nanobelts, and so on. These sensing materials showed high resistive response towards O 2 [ 109 ], CO [ 109 , 124 , 129 , 135 , 140 , 154 , 155 ], CO 2 [ 158 ], H 2 [ 113 , 132 , 176 ], NH 3 [ 159 , 162 , 177 ], NO 2 [ 125 , 126 , 128 , 141 , 160 , 161 , 176 ], VOCs such as C 2 H 6 O [ 117 , 123 , 141 , 168 ], C 3 H 6 O [ 123 , 133 , 157 ], C 3 H 8 O [ 120 ], and water vapor [ 127 , 130 , 134 ], as reported by many authors. The operating temperature can be low to room temperature due to the large specific surface area and robust properties of nanostructures.…”

Section: Ga 2 O 3 -Based Gas Se...mentioning

confidence: 99%

Gallium Oxide for Gas Sensor Applications: A Comprehensive Review

Zhu

et al. 2022

Materials

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Ga2O3 has emerged as a promising ultrawide bandgap semiconductor for numerous device applications owing to its excellent material properties. In this paper, we present a comprehensive review on major advances achieved over the past thirty years in the field of Ga2O3-based gas sensors. We begin with a brief introduction of the polymorphs and basic electric properties of Ga2O3. Next, we provide an overview of the typical preparation methods for the fabrication of Ga2O3-sensing material developed so far. Then, we will concentrate our discussion on the state-of-the-art Ga2O3-based gas sensor devices and put an emphasis on seven sophisticated strategies to improve their gas-sensing performance in terms of material engineering and device optimization. Finally, we give some concluding remarks and put forward some suggestions, including (i) construction of hybrid structures with two-dimensional materials and organic polymers, (ii) combination with density functional theoretical calculations and machine learning, and (iii) development of optical sensors using the characteristic optical spectra for the future development of novel Ga2O3-based gas sensors.

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“…The various precursors used to synthesize Ga 2 O 3 nanomaterials were gallium acethylacetonate [ 201 ], commercial Ga 2 O 3 [ 45 ], Gallium(III) chloride aqueous solution [ 43 , 201 ], Ga metal [ 202 ], and gallium nitrate hydrate [ 21 , 203 , 204 , 205 , 206 , 207 , 208 , 209 , 210 , 211 , 212 , 213 , 214 , 215 , 216 , 217 , 218 , 219 , 220 , 221 , 222 , 223 , 224 , 225 , 226 , 227 , 228 , 229 , 230 , 231 ].…”

Section: Ga 2 O 3 Materials And...mentioning

confidence: 99%

“…R. Pilliadugula et al [ 216 ] synthesized α-Ga 2 O 3 (at 400–700 °C) and β-Ga 2 O 3 nanorods (900, 1000 °C) using gallium nitrate aqueous solution. The band gap of as-synthesized GaOOH and β-Ga 2 O 3 -1000 °C powders measured by diffuse reflectance spectra was 4.6 eV and 5.51 eV respectively.…”

Section: Ga 2 O 3 Materials And...mentioning

confidence: 99%

A Review on Gallium Oxide Materials from Solution Processes

et al. 2022

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Gallium oxide (Ga2O3) materials can be fabricated via various methods or processes. It is often mentioned that it possesses different polymorphs (α-, β-, γ-, δ- and ε-Ga2O3) and excellent physical and chemical properties. The basic properties, crystalline structure, band gap, density of states, and other properties of Ga2O3 will be discussed in this article. This article extensively discusses synthesis of pure Ga2O3, co-doped Ga2O3 and Ga2O3-metal oxide composite and Ga2O3/metal oxide heterostructure nanomaterials via solution-based methods mainly sol-gel, hydrothermal, chemical bath methods, solvothermal, forced hydrolysis, reflux condensation, and electrochemical deposition methods. The influence of the type of precursor solution and the synthesis conditions on the morphology, size, and properties of final products is thoroughly described. Furthermore, the applications of Ga2O3 will be introduced and discussed from these solution processes, such as deep ultraviolet photodetector, gas sensors, pH sensors, photocatalytic and photodegradation, and other applications. In addition, research progress and future outlook are identified.

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Gas sensing performance of GaOOH and β-Ga₂O₃ synthesized by hydrothermal method: a comparison

Cited by 20 publications

References 27 publications

Growth and Photocatalytic Properties of Gallium Oxide Films Using Chemical Bath Deposition

Growth and Photocatalytic Properties of Gallium Oxide Films Using Chemical Bath Deposition

Gallium Oxide for Gas Sensor Applications: A Comprehensive Review

A Review on Gallium Oxide Materials from Solution Processes

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