Dielectric properties, structure and morphology during synthesis of β-Ga2O3 by microwave calcination of GaOOH

Yuwen, Chao; Liu, Bingguo; Zhang, Libo

doi:10.1016/j.ceramint.2020.06.278

Cited by 10 publications

(6 citation statements)

References 27 publications

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“…XPS profiles of the samples were acquired to study the chemical states of each element in the reaction products . As shown in Figure a, the Ga 2p spectrum was fitted using four peak functions, which were assigned as follows: Ga 2p 3/2 at 1115.6 eV, Ga 2p 1/2 at 1142.44 eV, Ga 3+ 2p 3/2 at 1118.08 eV, and Ga 3+ 2p 1/2 at 1142.44 eV.…”

Section: Resultsmentioning

confidence: 99%

“…XPS profiles of the samples were acquired to study the chemical states of each element in the reaction products. 23 As shown in Figure 3a, the Ga 2p spectrum was fitted using four peak functions, which were assigned as follows: Ga 2p 3/2 at 1115.6 eV, Ga 2p 1/2 at 1142.44 eV, Ga 3+ 2p 3/2 at 1118.08 eV, As schematically illustrated in Figure 4a, the liquid metals, before and after being immersed in water, lacked a crystalline lattice. The clipping products were characterized using XRD analysis, and the corresponding data is depicted in Figure 4b.…”

Section: Gamentioning

confidence: 99%

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Liquid-Metal Molecular Scissors

Duan,

Zhou,

et al. 2024

ACS Appl. Mater. Interfaces

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Molecules are the smallest units of matter that can exist independently, relatively stable, maintaining their physical and chemical activities. The key factors that dominate the structures and properties of molecules include atomic species, alignment commands, and chemical bonds. Herein, we reported a generalized effect in which liquid metals can directly cut off oxygen-containing groups in molecular matter at room temperature, allowing the remaining groups to recombine to form functional materials. Thus, we propose basic liquid-metal scissors for molecular directional clipping and functional transformations. As a proof of concept, we demonstrate the capabilities of liquid-metal scissors and reveal that the gallium on the surface of liquid metals directly extracts oxygen atoms from H 2 O or CH 3 OH molecules to form oxides. After clipping, the remaining hydrogen atoms from the H 2 O molecules recombine to form H 2 , while the remaining fragments of CH 3 OH produce H 2 , carbon materials, and carboxylates. This finding refreshes our basic understanding of chemistry and should lead to the development of straightforward molecular weaving techniques, which can help to overcome the limitations of molecular substances with single purposes. It also opens a universal route for realizing future innovations in molecular chemical engineering, life sciences, energy and environment research, and biomedicine.

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Section: Resultsmentioning

confidence: 99%

Section: Gamentioning

confidence: 99%

Liquid-Metal Molecular Scissors

Duan,

Zhou,

et al. 2024

ACS Appl. Mater. Interfaces

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“…From the heat flow plots for GO and GOFe, Figure 2B, it is possible to distinguish two endothermic peaks at 315 and 375 °C, respectively. These peaks can be attributed to the transformation of GaO(OH) into α-Ga 2 O 3 (Reddy et al, 2015;Shan et al, 2017;Yuwen et al, 2020). In addition, a less pronounced endothermic peak around 730 °C can be observed.…”

Section: Thermogravimetric Analysismentioning

confidence: 95%

“…Different methods for synthesizing gallium oxyhydroxides, GaO(OH) nanostructures, have been reported. These methods include sol-gel (Cheah et al, 2020), hydrothermal (Quan et al, 2010;Suman et al, 2021), precipitation (Parveen et al, 2018), coprecipitation (Venediktova et al, 2017), thermal and microwave plasma chemical vapor (Zhu et al, 2006;Stijepovic et al, 2015;Rex et al, 2019), microwaves (Deshmane et al, 2010;Yuwen et al, 2020), ultrasonic (Parveen et al, 2018). Analogously, other precursors have been reported, such as nitrates (Quan et al, 2010;Shan et al, 2017;Das et al, 2019;Suman et al, 2021), chlorides (Suman et al, 2021) and organic compounds (Stijepovic et al, 2015;Suman et al, 2021) of gallium and, recently, gallium and gallium based liquid metals (Kumar et al, 2015;Shan et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…The optical properties of materials for optoelectronic and photocatalytic applications can be improved by doping those materials. Gallium oxides have been doped with N, S, In, Tl, Se, Sn, Cr, Cu, Ti, Mn, Mo, Ni, Zn, Pb and W. These metals promote changes in their optical absorption and band gap, enhancing their photocatalytic activity (Choi and Son, 2017;Venediktova et al, 2017;Manandhar et al, 2019;Yuwen et al, 2020;Roy and Ramana, 2021). Du et al (2021) investigated the site replacement of Ga atoms by Zn atoms.…”

Section: Introductionmentioning

confidence: 99%

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Gallium Oxides Photocatalysts Doped With Fe Ions for Discoloration of Rhodamine Under UV and Visible Light

Orozco

Rivero

Montiel

et al. 2022

Front. Environ. Sci.

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Heterogeneous photocatalysis is a highly efficient process for degrading recalcitrant and emerging pollutants. Rhodamine B (RhB) is a nonbiodegradable and highly refractory compound persistent in conventional processes. In this work, we investigate the photocatalytic activity of gallium-based catalysts undoped (GO) and doped with Fe ions (GOFe). Catalysts were synthesized by simple precipitation assisted with an ultrasonic transducer and subjected to thermal treatment at different temperatures (500, 650, 800 and 950°C). They were characterized by thermogravimetric analysis (TGA), Fourier transform infrared (ATR-FTIR) spectroscopy, and X-ray diffraction (XRD). Catalysts were tested in the discoloration of Rhodamine B dye. Experiments were carried out at different pH values (3.00, 5.00 and 9.00) in the presence of H2O2 and using Visible and Visible-UV light sources as study variables. Better discoloration results were observed for GO and GOFe under acid environments (pH = 3.00) for both light sources. GO and GOFe photocatalyst showed high effectiveness in the discoloration of RhB completing the process in 300 min, under a Visible-UV lamp at pH = 3.00. Incorporating Fe ions into the gallium oxides matrix decreases its bandgap, allowing it to activate under visible light. The discoloration process exhibited pseudo-zero-order apparent kinetics.

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Microwave Preparation of Porous Graphene from Wasted Tires and Its Pyrolysis Behavior

Liu

Yuwen

et al. 2022

Waste Biomass Valor

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Nowadays, most waste tires are disposed of by direct combustion or via land ll, which inevitably creates a large volume of waste. However, the soft carbon found in tires can be an excellent precursor in the preparation of graphene. In this study, waste tires were mixed with potassium hydroxide (KOH) and heated in a microwave environment to be converted rapidly into porous graphene, a process having no complicated pre-processing. Moreover, the processes, tools, and chemical reagents are distinct and inexpensive. Thermogravimetric analysis and dielectric property testing of the tires and mixtures were conducted to study their pyrolysis behavior and catalytic reactions. It was found that when the temperature reached more than 750°C, potassium ions and carbon underwent a reduction reaction to generate potassium vapor, which catalyzed the carbon in the tires into porous graphene, and that microwave heating could shorten the heating time. Simultaneously, the carbon in the tire could be sheared smaller and thinner during the rapid pyrolysis and volatilization of the gas, bene tting the graphene production. The products of the mixed materials were then characterized and analyzed at different holding temperatures and times. As the holding time increased, the degree of graphitization of the products increased, the number of layers increased slightly, and the impurity elements were completely removed from the products.

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Dielectric properties, structure and morphology during synthesis of β-Ga2O3 by microwave calcination of GaOOH

Cited by 10 publications

References 27 publications

Liquid-Metal Molecular Scissors

Liquid-Metal Molecular Scissors

Gallium Oxides Photocatalysts Doped With Fe Ions for Discoloration of Rhodamine Under UV and Visible Light

Microwave Preparation of Porous Graphene from Wasted Tires and Its Pyrolysis Behavior

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