Properties and Photocatalytic Activity of β‐Ga2O3 Nanorods under Simulated Solar Irradiation

Wang, Yinzhen; Li, Ning; Duan, Pingping; Sun, Xinyu; Chu, Benli; He, Qinyu

doi:10.1155/2015/191793

Cited by 18 publications

(19 citation statements)

References 21 publications

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“…The Raman spectra of the white-colored β-Ga2O3 NRs, which were formed by calcinating GaOOH at 700 C for 5 h, is exhibited in Figure 2b. A group of peaks at 168, 198, 345, 415, 474, 562, 653, 766 cm −1 were observed, which is consistent with those of Wang's study [17]. These features correspond to Raman modes of monoclinic β-Ga2O3 [18].…”

Section: Resultssupporting

confidence: 90%

Synthesis and Photocatalytic Activity of β-Ga2O3 Nanostructures for Decomposition of Formaldehyde under Deep Ultraviolet Irradiation

Lee

Doan

Park³

et al. 2020

Catalysts

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An attempt to degrade volatile organic compounds (VOCs) and sterilize air simultaneously is highly desirable to improve indoor air quality. With the help of deep ultraviolet (UVC) lighting, harmful bacteria that exists in the air can be destroyed. Thus, a new photocatalytic substance that can break down VOCs under UVC irradiation is required. Here, we demonstrate the photocatalytic activity of β-Ga2O3 nanostructures, synthesized via the solvothermal method for removing formaldehyde (HCHO) under deep ultraviolet irradiation. The Raman and XRD results indicated that as-synthesized nanostructures showed β-crystalline phase with a monoclinic structure. The photoluminescence spectrum exhibited a broad and strong green emission peak at 510 nm, which was likely attributed to a considerable amount of oxygen and gallium vacancies formed during the calcinating process. The photocatalytic efficiency for decomposing HCHO at room temperature under deep ultraviolet irradiation (278 nm) of the synthesized β-Ga2O3 nanoparticles is higher than that of the β-Ga2O3 nanorods. Both nanoparticles and nanorods obeyed the pseudo-first-order Langmuir-Hinshelwood kinetic model with a degradation rate constant of 0.057 and 0.033 min−1, corresponding to the efficiency of 82% and 62% in the formaldehyde removal, respectively.

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Section: Resultssupporting

confidence: 90%

Synthesis and Photocatalytic Activity of β-Ga2O3 Nanostructures for Decomposition of Formaldehyde under Deep Ultraviolet Irradiation

Lee

Doan

Park³

et al. 2020

Catalysts

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“…Ga is oxidized and forms a solid phase of gallium (III) oxide (Ga 2 O 3 ) (Eq. 1 ) 25 , 26 . Then, this Ga 2 O 3 is reduced by liquid metallic gallium and forms a gas phase of gallium suboxide (Ga 2 O) (Eq.…”

Section: Resultsmentioning

confidence: 99%

Gallium oxide nanowires for UV detection with enhanced growth and material properties

Alhalaili

Bunk

Mao

et al. 2020

Sci Rep

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In the last decade, interest in the use of beta gallium oxide (β-Ga2O3) as a semiconductor for high power/high temperature devices and deep-UV sensors has grown. Ga2O3 has an enormous band gap of 4.8 eV, which makes it well suited for these applications. Compared to thin films, nanowires exhibit a higher surface-to-volume ratio, increasing their sensitivity for detection of chemical substances and light. In this work, we explore a simple and inexpensive method of growing high-density gallium oxide nanowires at high temperatures. Gallium oxide nanowire growth can be achieved by heating and oxidizing pure gallium at high temperatures (~ 1000 °C) in the presence of trace amounts of oxygen. This process can be optimized to large-scale production to grow high-quality, dense and long Ga2O3 nanowires. We show the results of morphological, structural, electrical and optical characterization of the β-Ga2O3 nanowires including the optical bandgap and photoconductance. The influence of density on these Ga2O3 nanowires and their properties will be examined in order to determine the optimum configuration for the detection of UV light.

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“…Recently, various methods have been used to synthesize Ga 2 O 3 , including hydrothermal techniques [11,23], microwave-assisted hydrothermal methods [21], sol-gel methods [24], spray pyrolysis processes [25], and chemical vapor deposition [26]. The advantages of CBD for the synthesis of metal oxide thin films are based on the relatively low cost and convenience for deposition over a large area [27].…”

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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Properties and Photocatalytic Activity of β‐Ga₂O₃ Nanorods under Simulated Solar Irradiation

Cited by 18 publications

References 21 publications

Synthesis and Photocatalytic Activity of β-Ga2O3 Nanostructures for Decomposition of Formaldehyde under Deep Ultraviolet Irradiation

Synthesis and Photocatalytic Activity of β-Ga2O3 Nanostructures for Decomposition of Formaldehyde under Deep Ultraviolet Irradiation

Gallium oxide nanowires for UV detection with enhanced growth and material properties

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

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