JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2013
·Vol. 96
·期 7
·2046-2049
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IF 2.107
Songping Wu,Qing Ma,Fan He
Zn 2 GeO 4 ceramic materials were synthesized by the solid-state method. Zn 2 GeO 4 powders were investigated with X-ray powder diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). Oxygen defects in the Zn 2 GeO 4 ceramics were investigated by photoluminescence, Raman, and EDS spectra. Conductivity of Zn 2 GeO 4 was 0.18 S/cm at low temperature of 773 K, and its activation energy was 0.49 eV. The results showed that Zn 2 GeO 4 was a promising low-temperature electrolyte with high conductivity.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 102
·期 11
·6517-6528
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IF 3.094
Liu Pei,Yan Xu,Jiaqiang Liu,Junbiao Wu,Yide Han,Xia Zhang
Morphology modulation of photocatalyst has been demonstrated to be a crucial strategy for improving the catalytic performance in solar energy conversion system. Here we systematically investigated the influence of the solvent-dependent morphology evolution of Zn 2 GeO 4 phase on the photocatalytic efficiency of the as-prepared g-C 3 N 4 /Zn 2 GeO 4 composites. The morphologies of Zn 2 GeO 4 were rationally tuned from flower-like nanosheets to length-controllable nanorods, and microclusters assembled from microrods through regulating the solution polarity of different organic solvents. Accordingly, the Zn 2 GeO 4 sample prepared in ethylene glycol (EG) with long rod-like morphology and integrated with g-C 3 N 4 , abbreviated as g-C 3 N 4 /Zn 2 GeO 4 (1:1)-EG, exhibited the best visible-light absorption ability and the highest efficiency. The synergetic effect of the long rod-like Zn 2 GeO 4 phase with many exposed (110) crystalline facets and g-C 3 N 4 accelerates the separation and interface transportation of photoexcited charge carriers, as confirmed by photocurrent measurements. The MB degradation mechanism was also proposed to clarify the charge-transfer process and the improved photodegradation activity. This study offers an experimental basis for understanding the significance of morphology control on rational design of photocatalysts with improved performance.
研究领域:
材料科学
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光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 15
·11625-11631
·
IF 2.779
Xing Zhuo,Weng Juhai,Ma Chi
A series of Ga 3+ -doped Zn 2 GeO 4 willemite ceramics, in a general formula Zn 2+0.5 x Ge 1− x Ga x O 4 (0.1 ≤ x ≤ 0.4), were prepared and the influence of Ga 3+ doping on the phase composition, structure, microstructure, and microwave dielectric properties were studied. XRD, SEM, and Raman analysis evidence that by moderate gallium substitution in the nominal Zn 2 GeO 4 , the unfavorable ZnO phase was suppressed, while a low-loss ZnGa 2 O 4 phase was induced. With increasing doping content, the ZnGa 2 O 4 phase increases in phase percentage and becomes dominant (~ 69%) after x = 0.3. Due to the mixture rule, both relative permittivity and quality factor were improved, which is related to the superior dielectric properties of ZnGa 2 O 4 compared to Zn 2 GeO 4 . The microwave dielectric properties show a remarkable dependence on the composition. Sintered at 1230 °C, a combination of dielectric performances with ε r ~ 9.4, Q × f ~ 97,000 GHz, and τ f ~ − 30.7 ppm/°C was accessed in the x = 0.4 composition.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2013
·
IF 2.39
Songping Wu,Qing Ma
Zn 2 GeO 4 ceramic materials were synthesized by solid-state method. Zn 2 GeO 4 powders were investigated with X-ray powder diffraction (XRD), Fourier transform infrared (FT-IR) spectrum, Raman spectrum, X-ray photoelectron spectrum (XPS), and high resolution transmission electron microscopy (HRTEM). A dense microstructure of Zn 2 GeO 4 ceramics developed when specimens were sintered at above 1150 °C. The Zn 2 GeO 4 ceramics sintered at 1300 °C exhibited good microwave dielectric properties: a dielectric constant ( ε r ) of 6.87, a quality factor ( Q × f ) of 102,700 GHz and a temperature coefficient of resonant frequency ( τ f ) of −32.4 ppm/°C. The results showed that Zn 2 GeO 4 ceramics were promising millimeter-wave ceramic candidate materials.
研究领域:
材料科学
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2013
·Vol. 6
·期 5
·2649-2659
·
IF 6.233
Liming Sun,Yue Qi,Chun-Jiang Jia,Zhao Jin,Weiliu Fan
Fabricating heterojunction photocatalysts is an important strategy for speeding up the separation rate of photogenerated charge carriers, which is attracting greater interest. However, the choice of three factors, individual materials, band offsets, and effective interfaces, is still important for fabricating efficient heterojunction photocatalysts. Herein, efficient g-C3N4/Zn2GeO4 photocatalysts with effective interfaces were designed by controlling the surface charges of the two individual materials inside the same aqueous dispersion medium, making use of the electrostatic attraction between oppositely charged particles. The g-C3N4/Zn2GeO4 heterojunction with opposite surface charge (OSC) showed higher visible-light photocatalytic activity for degradation of methylene blue than those of pure g-C3N4, pure Zn2GeO4, and the g-C3N4/Zn2GeO4 with identical surface charge (ISC). The investigation of the light absorption spectrum, adsorption ability, and photocurrent responses revealed that the improved separation of photogenerated carriers was the main reason for the enhancement of the OSC g-C3N4/Zn2GeO4 sample's photocatalytic activity. By combining with theoretical calculations, we investigated the microscopic mechanisms of interface interaction and charge transfer between g-C3N4 and Zn2GeO4. The photogenerated electrons in the g-C3N4 N 2p states directly excited into the Zn 4s and Ge 4s hybrid states of Zn2GeO4. The strategy of designing and preparing a g-C3N4/Zn2GeO4 composite catalyst in this work is very useful for fabricating other efficient heterojunction photocatalysts.
研究领域:
材料科学
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光催化
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 8
·085005
·
IF 1.929
Jun Li,Xuemei Diao,Yumin Xiao,Lizhao Qin,Hua Lin,Qing Li,Bin Liao
The continuous discharge of organic dye effluents from textile industries causes severe global water pollution. A sustainable and effective route needs to be developed for the treatment of textile effluent in order to enable environmental protection and water recycling. In particular, the nanomaterials-based photocatalytic degradation of organic compounds is a promising approach to minimize water pollution. Herein, a facile hydrothermal method was reported for the preparation of Zn2GeO4 nanorods (NDs) with unique size, shape, and surface chemistry using sodium lauryl sulfate (SDS) as the surfactant. The crystal structure, size, and shape of the synthesized NDs were characterized by x-ray diffraction pattern (XRD) and field-emission scanning electron microscopy (FESEM). Initially, the XRD pattern revealed that SDS plays a crucial role in the formation of highly pure Zn2GeO4 NDs with rhombohedral crystalline nature. It was clearly noticed that increasing SDS concentration results in the formation of Zn2GeO4 NDs with decreased size ranges (100 nm). Conversely, the size of Zn2GeO4 NDs increased at higher SDS concentrations. The photocatalytic activity of Zn2GeO4 NDs was evaluated by the degradation of methyl orange (MO) in aqueous solution. Under light irradiation, the Zn2GeO4 NDs prepared by using different concentrations of SDS exhibited varied photocatalytic performance. Among the tested samples, Zn2GeO4 NDs prepared with 0.1 g of SDS showed the best photocatalytic activity with a MO decomposition rate of 94.6% within 60 min. This study suggests that SDS can be used to modulate the morphology and photocatalytic performance of Zn2GeO4 NDs, and the resultant Zn2GeO4 NDs can serve as a photocatalyst in wastewater treatment.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2012
·
IF 3.461
Xiao-Liang Mao,Dong-Xing Xu,Ming-Lai Fu,Baoling Yuan,Jian-Wen Shi,Hao-Jie Cui
Zn 2 GeO 4 nanobelts modified by CdS quantum dots (Zn 2 GeO 4 /CdS) were prepared successfully by chemical bath deposition. The novel photocatalyst was characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and UV–Vis diffuse reflectance spectroscopy. It was found that Zn 2 GeO 4 /CdS consisted of uniform rhombohedral phase Zn 2 GeO 4 nanobelts with highly dispersed cubic phase CdS quantum dots, and the Zn 2 GeO 4 /CdS exhibited strong visible light absorption at about 510 nm. The photocatalytic activities of the catalysts were evaluated by the discoloration of Rhodamine B under visible light illumination and were compared with that of pure Zn 2 GeO 4 nanobelts. The results suggested that the composite photocatalyst had much higher photocatalytic activities than pure Zn 2 GeO 4 nanobelts under irradiation of visible light. Meanwhile, no obvious deactivation of Zn 2 GeO 4 /CdS was observed after the three recycles experiments in photodegradation of RhB. The possible mechanism of visible light photocatalytic degradation is also proposed.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Lijing Han,Huihui Yang,Jing Tang,Qiaohua Wei,Mingdeng Wei
A new composite of Zn 2 GeO 4 @multi-walled carbon nanotubes (Zn 2 GeO 4 @MWCNTs) has been synthesized by using a facial microwave assisted hydrothermal method , and found that the Zn 2 GeO 4 nanorods were anchored on the surface of MWCNTs and embedded into the voids of MWCNTs aggregation, which could provide a conductive network for fast transport of ion and a buffer space for volumetric change during the charge-discharge process. The MWCNTs in the composite has also acted as conductive agent, avoiding the use of additional conductive agents. When used as an anode for LIBs , this composite delivered a high specific capacity of 1397.9 mA h g −1 at 0.2 A g −1 after 300 cycles, an excellent rate capability and long cycling stability over1800 cycles at a high rate of 1.0 A g −1 . The results of in situ X-ray diffraction (XRD) measurements showed that the Li 22 Ge 5 was formed during the discharge process, and others were amorphous phase, which can provide more active sites for lithium storage, and is beneficial to the fast diffusion of lithium ion , resulting in superb cycling performance.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 36
·9778-9785
·
IF 5.976
Qiang Zhang,Yan Xu,Zhuopeng Wang,Xia Zhang,Zhiguo Xia
Dual-emitting hierarchical Bi4(GeO4)3/Zn2GeO4 hybrid microspheres have been prepared by a facile one-pot hydrothermal synthesis of Zn2GeO4 with the addition of pre-synthesized BiOBr nanoplates. The phase composition and morphology evolution of the Bi4(GeO4)3/Zn2GeO4 composites are investigated depending on the amounts of BiOBr precursor used in the hydrothermal process. The photoluminescence peaks at 412 and 532 nm for the as-prepared Bi4(GeO4)3/Zn2GeO4 are ascribed to Bi3+ emission and defect-related centers in the Zn2GeO4 component, respectively, and the features show a quenching response toward a temperature increase. The fluorescence intensity ratio (FIR) of Bi3+: 3P1–1S0 (412 nm) to the defect emission center of Zn2GeO4 (532 nm) can be exploited as a self-calibrated temperature index for potential thermometer applications. The maximum relative sensitivity (Sr) is 3.96% °C−1 in the temperature range of 20 °C to 100 °C. This work expands the rational design strategy for controllable particle morphology and structure modulation, and further explores their synergetic distinctive properties and potential optical sensor applications.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 82
·51807-51813
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IF 3.108
T. T. Yu,H. L. Liu,M. Huang,J. H. Zhang,D. Q. Su,Z. H. Tang,J. F. Xie,Y. J. Liu,A. H. Yuan,Q. H. Kong
To improve the electrical conductivity and cycling stability of germanium compounds as anode materials for lithium ion batteries (LIBs), Zn2GeO4 nanorods grown on carbon cloth (Zn2GeO4/CC) were designed and fabricated by a simple hydrothermal process combined with a post-annealing treatment. The Zn2GeO4/CC composites possess hierarchical porosity and a network structure. Serving as free-standing and binder-free anodes for LIBs, they exhibit high specific capacity and excellent reversibility. A discharge capacity as high as 1851.9 mA h g−1 is attained at a current density of 200 mA g−1, and the Zn2GeO4/CC electrode still maintains a high reversible capacity of 1302.3 mA h g−1 after 200 cycles. Even at a high specific current of 2000 mA g−1, it still retains a capacity of 847.5 mA h g−1. The superior electrochemical performance of the Zn2GeO4/CC composites is attributed to the synergistic effects of the hierarchical porosity, Zn2GeO4 nanorods, and 3D carbon cloth network structure, which can effectively accommodate the huge volume change of the Zn2GeO4 nanorods during cycling and maintain perfect electrical conductivity throughout the electrode. Moreover, the excellent mechanical flexibility of the Zn2GeO4/CC composites makes the material a promising candidate for self-supported and flexible electrodes for LIBs.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2021
·
IF 4.837
Nanyu Fan,Quan Kong,Ruifeng Lang,Hongtao Guan,Gang Chen,Chengjun Dong
One-dimensional (1D) Zn 2 GeO 4 rods were in-situ grown on Ni foam (NF) using a ethylenediamine (En)/water mixed solvent by a hydrothermal route in one single step. Such rhombohedral phase Zn 2 GeO 4 rods are 1–2 μm in diameter and a few micrometers in length. Ethylenediamine is found to play a critical role in coordinating with starting zinc and germanium ions and acting as template. The Zn 2 GeO 4 /NF was developed as a new none-enzymatic hydrogen peroxide (H 2 O 2 ) sensor. In electrochemical studies, the Zn 2 GeO 4 /NF electrode exhibits high sensitivity (3974 μM mM −1 cm −2 ), wide linear detection range (1–4000 μM), fast response (<9 s), low detection limit (1 μM), excellent selectivity and stability towards H 2 O 2 . Several factors such as intrinsic nature of Zn 2 GeO 4 , the unique microstructure and the seamless contact with NF are believed to attributed to the excellent electrochemical sensing performances.
研究领域:
材料科学
·
生物传感技术
✓ 已验证
DOI
高影响因子
Nanoscale
·
2013
·Vol. 5
·期 24
·12335-12341
·
IF 6.233
Songping Wu,Zhuolin Wang,Xin Ouyang,Zhiqun Lin
Size-tunable crystalline core–crystalline shell Zn2GeO4 nanorods were synthesized via a facile hydrothermal reaction. High purity Zn2GeO4 nanorods were obtained at pH = 7. The length of Zn2GeO4 nanorods (L = 50–100 nm) can be controlled through a one-step process, while micro-sized nanorods with an aspect ratio of the length to the diameter of 10 were yielded in a two-step process. The single crystalline nature of Zn2GeO4 nanorods with a core–shell structure was verified by high resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) measurements. The Raman study revealed that there is no oxygen defect in Zn2GeO4 nanocrystals, suggesting that photoluminescence emission of Zn2GeO4 can be attributed to the presence of the interstitial Zn defect in Zn2GeO4 nanocrystals. As the diameter of nanorods decreased, the excitation and emission peaks appeared to be redshifted due to the quantum size effect.
研究领域:
材料科学
·
纳米技术
·
材料的光学性质
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）