ZnxGa2O3+x(0 ≤ x ≤ 1) solid solution nanocrystals: tunable composition and optical properties

Yuan, Yanping; Du, Weimin; Qian, Xuefeng

doi:10.1039/c1jm13091a

Cited by 52 publications

(33 citation statements)

References 40 publications

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“…7a The gap between the two peaks is about 23.06 eV, which is consistent with the reference value. 21 An obvious, red shift of Zn 2p binding energies was observed after Sn 2+ doping. Similar to Zn 2p, W 4f binding energies also showed peak shift (Figure 5c), which is assigned to the fact that Sn 2+ ions are incorporated into ZnWO 4 crystal structure and there are strong interactions between Sn 2+ ions and the ZnO 6 and WO 6 octahedra, being similar to that observed in Sr 0.25 H 1.5 Ta 2 O 6 ·H 2 O nanocrystals.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

Particle Size and Structural Control of ZnWO₄ Nanocrystals via Sn²⁺ Doping for Tunable Optical and Visible Photocatalytic Properties

et al. 2012

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In this work, we report on the microwave-assisted hydrothermal synthesis of Sn 2+ -doped ZnWO 4 nanocrystals with controlled particle sizes and lattice structures for tunable optical and photocatalytic properties. The samples were carefully characterized by X-ray diffraction, transmission electron microscopy, inductive coupled plasma optical emission spectroscopy, UV−vis diffuse reflectance spectroscopy, and Barrett−Emmett−Teller technique. The effects of Sn 2+ doping in ZnWO 4 lattice on the crystal structure, electronic structure, and photodegradation of methylene orange dye solution were investigated both experimentally and theoretically. It is found that part of the Sn 2+ ions were homogeneously incorporated in the ZnWO 4 host lattice, leading to a monotonous lattice expansion, and part of Sn 2+ ions were expelled at surface sites for decreased crystallinity and particle size reduction. By Sn 2+ doping, ZnWO 4 nanocrystals showed a significant XPS binding energy shift of Zn 2p, W 4f, and O 1s, which is attributed to the combination of electronegativity between Sn 2+ and Zn 2+ , lattice variation, and particle size reduction. Meanwhile, the BET surface areas were also greatly enlarged from 40.1 to ∼110 m 2 ·g −1 . Contrary to the theoretical predictions of the quantum size effect, Sn 2+ -doped ZnWO 4 nanocrystals showed an abnormal band gap narrowing, which can be well-defined as a consequence of bulk and surface doping effects as well as lattice variations. With well-controlled particle size, crystallinity, and electronic structure via Sn 2+ doping, the photocatalytic performance of Sn 2+ -doped ZnWO 4 nanocrystals was optimized at Sn 2+ doping level of 0.451. ■ INTRODUCTIONSemiconductor nanomaterials have distinct properties that promise new inventions and new materials for widespread technological applications and economic impacts. 1 It is a wellestablished fact that the physical properties of nanocrystals are strongly influenced by particle size, chemical composition, and surface chemistry. 2 Till now, vigorous efforts have been dedicated to tailoring the fundamental properties of semiconductors as a function of particle size, chemical composition as well as surface chemistry, including structural and electronic properties of ZnS nanoclusters, 3 photocatalytic performance of TiO 2 -based photocatalyts, 4 magnetic properties of EuS nanoparticles, 5 and so on. From the viewpoint of solid-state physics, the reduction of particle sizes and variation of chemical compositions often predict variations in lattice parameters and surface structures, which can have consequences on the electronic structures and properties. 6 Therefore, the ability to manipulate the size, shape, composition, crystal structure, and surface properties of nanocrystals is essential for uncovering the nature of structure-related physical properties.Metal tungstate is a very important family of inorganic materials that has high potential applications in various fields, such as photoluminescence, microwave applications, optical fibers, and sc...

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Section: ■ Results and Discussionmentioning

confidence: 98%

Particle Size and Structural Control of ZnWO₄ Nanocrystals via Sn²⁺ Doping for Tunable Optical and Visible Photocatalytic Properties

et al. 2012

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“…Fe 3 O 4 nanostructures have drawn much attention for use in catalysts, microwave absorption materials, drug delivery systems, and bimolecular materials recently 29–31. Many groups have successfully synthesized Fe 3 O 4 based core/shell or hollow nanostructures using functionalized SiO 2 or polystyrene templates 31–34. For instance, Huang et al reported the fabrication of Fe 3 O 4 nanoparticle‐coated polystyrene microspheres 33.…”

Section: Resultsmentioning

confidence: 99%

“…For instance, Huang et al reported the fabrication of Fe 3 O 4 nanoparticle‐coated polystyrene microspheres 33. Yuan et al synthesized hollow silica/magnetic composite spheres using sulfonic acid functionalized hollow silica spheres as templates through a precipitation reaction 31. Polydopamine coated Fe 3 O 4 nanoparticles were also reported 35.…”

Section: Resultsmentioning

confidence: 99%

Polydopamine Spheres as Active Templates for Convenient Synthesis of Various Nanostructures

Yan

Yang

Lin

et al. 2012

Small

331

205

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In this work, monodisperse polydopamine (PDA) spheres with tunable diameters have been synthesized through a facile and low cost method using a deionized water and alcohol mixed solvent. The PDA spheres possess surface functional groups (-OH, -NH(2)), exhibiting an extraordinary versatile active nature. It is demonstrated that the PDA spheres could serve as an active template for the convenient synthesis of various nanostructures, e.g., MnO(2) hollow spheres or PDA/Fe(3)O(4) and PDA/Ag core/shell nanostructures. No surface modification or special treatment is required for the synthesis of these nanostructures, which makes the fabrication process simple and very convenient. The novel application of PDA/Fe(3)O(4) spheres as fillers in nanocomposites for high-performance capacitors is demonstrated, indicating a promising practicality. The PDA spheres provide a new general platform not only for the facile assembly of nanostructures but also a green synthetic template for practical applications.

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“…After 1 cycle, the static contact angle decreased to 148.5° ± 5.3° because the nanocraters had settled on the repeated washing cycles compared with the nonwashed superhydrophobic PET fabric (Figure 1a; Figure S9 contact angle to occur. [32] Therefore, after the additional thermal hydrophobic aging process at 130 °C for 1 and 24 h, the static contact angles increased to 153.1° ± 5.4° and 168.4° ± 4.7°, respectively, showing a self-healing property. After the extra thermal hydrophobic aging process at 130 °C for 24 h, when the washing cycle was repeated for 2 cycles, the static contact angle decreased to 146.3° ± 3.7° again.…”

Section: Durability Test: Tape Test and Ph Test And Washing Durabilitymentioning

confidence: 91%

Robust Fluorine‐Free Superhydrophobic PET Fabric Using Alkaline Hydrolysis and Thermal Hydrophobic Aging Process

Park

2018

Macro Materials & Eng

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A newly developed fluorine‐free method to render robust superhydrophobic polyethylene terephthalate (PET) fabric is introduced with alkaline hydrolysis followed by thermal hydrophobic aging process, i.e., nonchemical finishing. The superhydrophobic PET fabric shows a static contact angle of 170.7° ± 2.4° and a shedding angle of 8.6° ± 0.7°. Breathability and color of the fabricated PET fabric are improved and not changed. The alkaline hydrolyzed and thermal hydrophobic aged PET fabric is easily bent and has increased smoothness, fullness, and softness. Additionally, it has good durability for tape test, abrasion test, pH test, and washing test under an extra aging process that gives rise to self‐healing. Self‐cleaning property of the superhydrophobic PET fabric is excellent. Therefore, the alkaline hydrolyzed and thermally hydrophobic aged superhydrophobic fabric has a potential for commercial applications in functional or biomedical textiles, goods and related industries, with improved human/environmental friendliness and efficiency of care.

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Zn_xGa₂O_3+x(0 ≤ x ≤ 1) solid solution nanocrystals: tunable composition and optical properties

Cited by 52 publications

References 40 publications

Particle Size and Structural Control of ZnWO₄ Nanocrystals via Sn²⁺ Doping for Tunable Optical and Visible Photocatalytic Properties

Particle Size and Structural Control of ZnWO₄ Nanocrystals via Sn²⁺ Doping for Tunable Optical and Visible Photocatalytic Properties

Polydopamine Spheres as Active Templates for Convenient Synthesis of Various Nanostructures

Robust Fluorine‐Free Superhydrophobic PET Fabric Using Alkaline Hydrolysis and Thermal Hydrophobic Aging Process

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ZnxGa2O3+x(0 ≤ x ≤ 1) solid solution nanocrystals: tunable composition and optical properties

Cited by 52 publications

References 40 publications

Particle Size and Structural Control of ZnWO4 Nanocrystals via Sn2+ Doping for Tunable Optical and Visible Photocatalytic Properties

Particle Size and Structural Control of ZnWO4 Nanocrystals via Sn2+ Doping for Tunable Optical and Visible Photocatalytic Properties

Polydopamine Spheres as Active Templates for Convenient Synthesis of Various Nanostructures

Robust Fluorine‐Free Superhydrophobic PET Fabric Using Alkaline Hydrolysis and Thermal Hydrophobic Aging Process

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Zn_xGa₂O_3+x(0 ≤ x ≤ 1) solid solution nanocrystals: tunable composition and optical properties

Particle Size and Structural Control of ZnWO₄ Nanocrystals via Sn²⁺ Doping for Tunable Optical and Visible Photocatalytic Properties

Particle Size and Structural Control of ZnWO₄ Nanocrystals via Sn²⁺ Doping for Tunable Optical and Visible Photocatalytic Properties