Ga<sub>2</sub>O<sub>3</sub> and GaN Semiconductor Hollow Spheres

Sun, Xiaoming; Li, Yadong

doi:10.1002/anie.200353212

Cited by 527 publications

(288 citation statements)

References 50 publications

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“…The bands from the range of 1000 to 1400 cm -1 in the spectra of a, b, c, and d in Fig. 2 were caused by O-H bending vibration and C-OH stretching, which indicated the existence of many residual surface OH-group in these samples (Sun and Li 2004;Zhu et al 2007). In the photocatalytic reaction, the surface OHgroup, which can react with photogenerated holes on the surface of the catalyst, played a major role in enhancing the photocatalytic activity.…”

Section: Ftir Spectroscopy Analysis Of the Composite Catalystsmentioning

confidence: 90%

Preparation and Photocatalytic Activity of TiO2-Wrapped Cotton Nanofiber Composite Catalysts

Zhang

Wan

et al. 2017

BioRes

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A novel TiO2-wrapped nanofiber composite catalyst, which possessed a unique porous structure and mixed crystalline phase, was prepared by the combination of superficial sol-gel and post-calcination processes. By means of the superficial sol-gel process, TiO2 layers were deposited on the surface of each nanofiber-like cellulose fiber, and then the TiO2-wrapped nanofiber composite catalysts were calcined at different temperatures under a nitrogen atmosphere. With temperature increasing, the original cotton nanofiber composites were converted into porous carbon nanofiber catalysts wrapped by a TiO2 mixed crystalline phase, which was accompanied by a crystal transformation. The photocatalytic activity of the new catalysts was evaluated by the degradation of methylene blue (MB) under ultraviolet (UV) irradiation. The results demonstrated that the new catalysts had good photocatalytic ability, and the TNC-700 catalyst showed a superior photocatalytic ability compared with the other catalysts; the new catalysts had a unique porous structure, high specific surface area, and mixed crystalline phase. Additionally, the synergistic photocatalytic effect of the TiO2 and activated carbon nanofiber resulted in the efficient degradation of organic pollutants in water or air.

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Section: Ftir Spectroscopy Analysis Of the Composite Catalystsmentioning

confidence: 90%

Preparation and Photocatalytic Activity of TiO2-Wrapped Cotton Nanofiber Composite Catalysts

Zhang

Wan

et al. 2017

BioRes

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“…Li and co-workers prepared hollow spheres of Ga 2 O 3 by adsorption of metal cations into the surface layer of hydrophilic carbon (carbonaceous polysaccharide) spheres with copious -OH groups, followed by calcination in air. [59] Despite significant shrinkage, ca. 60%, in size during calcination, Ga 2 O 3 hollow spheres with smooth surfaces and a wall thickness as low as 16 nm can be obtained (see Fig.…”

Section: Chemical Adsorption On Surface Layermentioning

confidence: 98%

Hollow Micro‐/Nanostructures: Synthesis and Applications

2008

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Hollow micro‐/nanostructures are of great interest in many current and emerging areas of technology. Perhaps the best‐known example of the former is the use of fly‐ash hollow particles generated from coal power plants as partial replacement for Portland cement, to produce concrete with enhanced strength and durability. This review is devoted to the progress made in the last decade in synthesis and applications of hollow micro‐/nanostructures. We present a comprehensive overview of synthetic strategies for hollow structures. These strategies are broadly categorized into four themes, which include well‐established approaches, such as conventional hard‐templating and soft‐templating methods, as well as newly emerging methods based on sacrificial templating and template‐free synthesis. Success in each has inspired multiple variations that continue to drive the rapid evolution of the field. The Review therefore focuses on the fundamentals of each process, pointing out advantages and disadvantages where appropriate. Strategies for generating more complex hollow structures, such as rattle‐type and nonspherical hollow structures, are also discussed. Applications of hollow structures in lithium batteries, catalysis and sensing, and biomedical applications are reviewed.

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“…The importance for the synthesis of nanoparticles with desirable size and surface morphology has increased because of their potential applications in various fields in material sciences [1], electronics [2], and optics [3,4]. Tin oxide (SnO 2 ) is an n-type metal oxide semiconductor with a wide band gap (3.6 eV) [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Investigation on structural and photoluminescence properties of (Co, Al) Co-doped SnO2 nanoparticles

Venkateswara¹,

Venkatramana²,

Sankara³

et al. 2016

Nanosystems: Phys. Chem. Math.

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Pure and (Co, Al) co-doped (Co=1, 3, 5 mol %, and Al = 5 mol % as constant) SnO 2 nanoparticles were synthesized in aqueous solution by the chemical co-precipitation method using polyethylene glycol (PEG) as a stabilizer. The effects of structural and photoluminescence of (Co, Al) co-doped SnO 2 nanoparticles are investigated. The XRD pattern reveals that the samples are in a single phase rutile type tetragonal crystalline structure of SnO 2 . The peak positions with Co concentration are slightly shifted to lower 2θ values and size of particles from XRD calculations are in between 20-30 nm. The Raman studies of the samples reveal that the Raman peaks are shifted towards lower wave numbers, when compared to those of pure SnO 2 at 150 cm −1 , 303 cm −1 , 476 cm −1 , 630 cm −1 , and 765 cm −1 respectively. Photoluminescence studies show that pure SnO 2 has an emission peak at 444 nm and (Co, Al) co-doped samples show emission peaks at 417 nm, 433 nm and 485 nm with exciting wave length 320 nm. The PL intensity increases and broadening of peaks for co-doped samples with increase of Co concentration indicates the decrease of size of the crystallinity. The UV absorption spectrum exhibits absorption at 310 nm, and is in agreement with the emission spectra.

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Ga₂O₃ and GaN Semiconductor Hollow Spheres

Cited by 527 publications

References 50 publications

Preparation and Photocatalytic Activity of TiO2-Wrapped Cotton Nanofiber Composite Catalysts

Preparation and Photocatalytic Activity of TiO2-Wrapped Cotton Nanofiber Composite Catalysts

Hollow Micro‐/Nanostructures: Synthesis and Applications

Investigation on structural and photoluminescence properties of (Co, Al) Co-doped SnO2 nanoparticles

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Ga2O3 and GaN Semiconductor Hollow Spheres

Cited by 527 publications

References 50 publications

Preparation and Photocatalytic Activity of TiO2-Wrapped Cotton Nanofiber Composite Catalysts

Preparation and Photocatalytic Activity of TiO2-Wrapped Cotton Nanofiber Composite Catalysts

Hollow Micro‐/Nanostructures: Synthesis and Applications

Investigation on structural and photoluminescence properties of (Co, Al) Co-doped SnO2 nanoparticles

Contact Info

Product

Resources

About

Ga₂O₃ and GaN Semiconductor Hollow Spheres