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Qiang Liu Xinyu Mao Xiaoying Li Penghui Chen Xin Liu Ziyu Liu Danyang Zhu Haohong Chen Tengfei Xie Jiang Li 《Journal of the American Ceramic Society》2021,104(10):4927-4931
0.5 at.% Cr:ZnGa2O4 precursor was synthesized by the co-precipitation method with nitrates as raw materials, using ammonium carbonate as the precipitant. Low-agglomerated Cr:ZnGa2O4 powders with an average particle size of 43 nm were obtained by calcining the precursor at 900℃ for 4 h. Using the powders as starting materials, 0.5 at.% Cr:ZnGa2O4 ceramics with an average grain size of about 515 nm were prepared by presintering at 1150℃ for 5 h in air and HIP post-treatment at 1100℃ for 3 h under 200 MPa Ar. The in-line transmittance of 0.5 at.% Cr:ZnGa2O4 ceramics with a thickness of 1.3 mm reaches 59.5% at the wavelength of 700 nm. The Cr:ZnGa2O4 ceramics can be effectively excited by visible light and produce persistent luminescence at 700 nm. For Cr:ZnGa2O4 transparent ceramics, the brightness of afterglow was larger than 0.32 mcd/m2 after 30 min, which is far superior to that of Cr:ZnGa2O4 persistent luminescence powders. 相似文献
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采用水热法制备了ZnGa2O4纳米粉体,使用XRD、SEM、TEM及AFM对不同pH值条件下产物的结构及微观形貌进行了表征.结果表明pH值调节严重影响ZnGa2O4的晶相及粒度:当pH≥7.5时,可得到纯相的ZnGa2O4纳米粉体;随着pH的增加,晶胞参数增加,所得样品的平均粒径不断减小,其粒径范围为6~11nm,发射峰位置在450nm左右.所得样品的晶型很完整,GaO(OH)为细长棒状,ZnGa2O4晶粒为四方形和圆形. 相似文献
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通过水热法制备了一系列的石墨烯-镓酸锌复合物。所制备的材料用XRD,SEM,TEM,拉曼和XPS进行表征。同时,探究了复合物的气敏性能。结果表明,石墨烯的含量对复合材料的气敏响应值和选择性有着很大的影响,并且当石墨烯的含量在0.1%时,复合材料的性能最好。当操作温度在203摄氏度时,0.1%石墨烯-镓酸锌复合材料对1000ppm的甲醛的响应值达32.2倍,最低检测限度为1ppm。同时,该材料的选择性也比较优越,对1000ppm甲醛和1000ppm丙酮的响应值的比值为26.8。该材料对1000ppm甲醛的响应和恢复时间分别为11秒和5秒,对1ppm甲醛的响应和恢复时间分别为6秒和5秒. 相似文献
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采用高温固相法制备了ZnGa2O4:Cr3+ 近红外(660-1300 nm)长余辉荧光粉,并系统地研究了样品的荧光、长余辉、光激励发光及热释光性能.样品的余辉激发谱测试结果显示,ZnGa2O4:Cr3+ 长余辉材料的余辉主要源自O2-Ga3+之间的电荷迁移跃迁激发,而非Cr3+离子的本征跃迁激发.光激励发光性能的研究表明,ZnGa2O4:Cr3+ 在紫外光激发的余辉完全衰减后可以被近红外光再次激发出明亮的余辉,这说明ZnGa2O4:Cr3+ 在紫外光信息写入后可以用红外光进行信息读出.根据实验测试结果采用导带电子复合发光模型对样品的发光机理进行了详细的阐述. 相似文献
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Shicheng Yan Jiajia Wang Honglin Gao Nanyan Wang He Yu Zhaosheng Li Yong Zhou Zhigang Zou 《Advanced functional materials》2013,23(6):758-763
To realize practical applications of the photocatalysis technique, it is necessary to synthesize semiconductor photocatalysts with specific facets that induce high reactive activities and high reactive selectivity. However, a challenge lies in the synthesis of metal oxides containing more than one type of metal with specific facets. Usually, surfactants are used to control the crystal morphology, which induces surface contamination for the final products. Here, using the GaOOH nanoplate as precursor, ZnGa2O4 nanocubes with exposed {100} facets are synthesized by an hydrothermal ion‐exchange route without requiring the introduction of morphology controlling agents. These ZnGa2O4 nanocubes exhibit improved performance in the photoreduction of CO2 into CH4 or water splitting into hydrogen. Theoretical calculations indicates that the light‐hole effective mass on the {100} facets of ZnGa2O4 corresponds to the high hole mobility, which contributes to the efficient water oxidation to offer the protons for promoting CO2 photoreduction into hydrocarbon fuels. 相似文献
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Binod Kumar Singh Hojin Ryu Chang‐Hae Kim Ha‐Kyun Jung Jung‐Kyu Park Kyeung‐Yeol Jung Ho‐Jung Chang 《IEEJ Transactions on Electrical and Electronic Engineering》2006,1(1):30-34
Phosphor powders of zinc gallate (ZnGa2O4) with Mg and Mn for green and Tm‐Mg for blue luminescence were prepared by solid state reaction method for their improved luminescent properties. Green‐luminescence emitting ZnMnGa2O4 reached maximum intensity at Mn = 0.005 mol% and further improvement was achieved by the addition of Mg2+. Tm‐Mg based zinc gallate phosphor exhibited a strong blue emission, centered at ∼420 nm with the maximum intensity achieved for 0.003 mol% of Mg and 0.015 mol% of Tm. This study established the possibilities of controlling the luminescent characteristics of zinc gallate by adding various elements. © 2006 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
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试验以Ga(NO3)3·9H2O、Zn(NO3)2·6H2O、Cr(NO3)3·9H2O、Na3C6H5O7·2H2O为原料,采用水热法制备Cr^3+掺杂ZnGa2O4。通过XRD、TEM对样品的结构和形貌进行表征,通过UV-vis DRS、PL对样品进行光学性能表征,利用紫外-可见光分度计测试罗丹明B的吸光度变化情况对样品进行光催化性能检测。研究掺杂量、煅烧温度、保温时间对ZnGa2O4的影响,试验结果表明,最佳制备条件为:Cr^3+掺杂量1.0%、煅烧温度700℃、保温时间8 h。最佳条件下ZnGa1.99Cr0.01O4降解罗丹明B在60 min降解率可达97%;ZnGa1.99Cr0.01O4产氢量为446.4μmol/g,对比Zn Ga2O4产氢量为184.7μmol/g,产氢量增加。 相似文献
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Zheng‐Zhe Chen Liu‐Chun Wang Divinah Manoharan Chin‐Lai Lee Lai‐Chin Wu Wan‐Ting Huang Eng‐Yen Huang Chia‐Hao Su Hwo‐Shuenn Sheu Chen‐Sheng Yeh 《Advanced materials (Deerfield Beach, Fla.)》2019,31(49)
Chromium‐doped zinc gallate, ZnGa2O4:Cr3+ (ZGC), is viewed as a long‐lasting luminescence (LLL) phosphor that can avoid tissue autofluorescence interference for in vivo imaging detection. ZGC is a cubic spinel structure, a typical agglomerative or clustered morphology lacking a defined cubic shape, but a sphere‐like feature is commonly obtained for the nanometric ZGC. The substantial challenge remains achieving a well‐defined cubic feature in nanoscale. The process by which dispersed and well‐defined concave cubic ZGC is obtained is described, exhibiting much stronger LLL in UV and X‐ray excitation for the dispersed cubic ZGC compared with the agglomerative form that cannot be excited using X‐rays with a low dose of 0.5 Gy. The cubic ZGC reveals a specific accumulation in liver and 0.5 Gy used at the end of X‐ray excitation is sufficient for imaging of deep‐seated hepatic tumors. The ZGC nanocubes show highly passive targeting of orthotopic hepatic tumors. 相似文献
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Bin Wang Hao Wang Bingtian Tu Kaiping Zheng Honggang Gu Weimin Wang Zhengyi Fu 《Journal of the American Ceramic Society》2023,106(2):1230-1239
As an emerging transparent ceramic with extremely wide transmission range, the unique optical properties of ZnGa2O4 are of particular interest. In this work, ZnGa2O4 transparent ceramic with high optical quality was prepared by pressureless sintering and hot isostatic pressing. Its optical behavior was then comprehensively studied. The critical optical data, including refractive index, extinction coefficient, Abbé number, absorption coefficient in infrared region, and phonon frequency, were investigated. The indirect band gap and the phonon energy assisting indirect transition were determined as 4.10 and 0.17 eV, respectively. The modified Sellmeier equation and single-oscillator dispersion relation were derived to describe the optical dispersion. Benefitting from the weaker tetrahedral Zn–O bond and heavier cationic masses, the infrared transmission range of ZnGa2O4 transparent ceramic was broadened significantly. Oxygen vacancies were suggested to induce the absorption in lower photon energy region of ZnGa2O4 transparent ceramic, which may enrich its functionalization. This work is meaningful for gaining overall insight into optical properties of transparent materials. 相似文献
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