氧化铟的制备及制备条件对其结构与性质的影响

介绍了六种氧化铟的制备方法，其中以铟的气相沉积法和直流磁控溅射法制备氧化铟具有较大的优势，这两种方法工艺和技术也比较成熟。此外还介绍了制备条件对氧化铟的微观结构和性质的影响，以及根据对制备参数分析确定最佳制备条件，制备条件在氧化铟的制备过程中起着非常关键的作用。     

氧化铟纳米粉制备及表征研究

以无机盐为原料，采用液相沉淀法制备纳米氧化铟粉体。研究了沉淀反应条件及沉淀后处理等对纳米氧化铟粉体质量的影响，利用TG-DSC、FT-IR、XRD、SEM和EDS等分析手段对所制纳米氧化铟粉体的结构、粒度、形貌、成分等进行了表征。结果表明：该法制备的氧化铟纳米粉具有立方晶系结构、纯度较高、颗粒均匀呈球形、分散性良好、平均粒径为50nm左右。     

液相共沉淀法制备氧化铟锡超细粉体材料的研究进展

介绍了液相共沉淀法制备氧化锢超细锡粉体材料的工艺,分析了沉淀剂、反应物的浓度、煅烧的温度和时间、分散剂等四个因素对制备过程及产物的影响。按照三氧化铟和二氧化锡的质量比为9∶1选用铟盐和锡盐；用氨水、尿素或碳酸铵作沉淀剂,并且沉淀剂不同,反应时应控制的pH值和反应时间也不同；反应物In~(3+)的浓度0．2mol／L时可得到接近纳米级的超细氧化铟锡粉体材料；700～800℃煅烧3～5h,可使前驱物成为球状,其团聚现象也可以得到综合平衡；分散剂为硫酸铵、硅烷偶联剂KH570等,对其分散机理作了简要的分析。     

空心氧化铟小球的合成及其三甲胺气敏特性的测定

本文在以蔗糖为碳源,通过水热方法合成均匀分散的碳小球的基础上,以碳小球为硬模板,采用硬模板法,以硝酸铟为金属源,通过在空气中灼烧的方法获得氧化铟材料。经过透射电子显微镜(TEM),并结合广角X射线衍射(Wide-angleXRD)等手段,证实所得材料为高结晶度的空心氧化铟材料。通过在旁热式气敏元件表面简单涂抹的办法,氧化铟空心小球被制备成气敏器件,并对其三甲胺(TMA)气敏性能进行了测定。研究结果表明,该种材料在较低的工作温度下对TMA具有较高的敏感性和选择性,这表明该种材料是一种非常有前途的TMA气敏材料,有望在食品检测等领域获得广泛应用。     

纳米氧化铟锡在乙醇相中的分散稳定性研究

采用分光光度法和沉降法研究了剪切速率、分散时间、pH值、分散剂种类和用量对纳米氧化铟锡在乙醇相中的分散稳定性的影响,得到纳米氧化铟锡在乙醇相中稳定分散的条件:选用偶联剂KH570,加入量为纳米氧化铟锡质量的1%,剪切速率为5000 r/min,剪切时间6 h.该研究成果为纳米氧化铟锡的应用提供了依据.     

有机金属先驱体分解制备铟和氧化铟纳米颗粒

介绍了有机金属先驱体In(η5-C5H5)分解制备铟(In)和氧化铟(In2O3)纳米颗粒的实验方法,并利用透射电子显微镜(TEM)观察制备的In和In2O3纳米颗粒的微观结构.     

以水溶液法制备氧化铟锡粉末的方法

一种以水溶液法制备氧化铟锡粉末的方法，其是利用水及适当添加剂，分别溶解锢化合物、锡化舍物于水中，而配制出二澄清的溶液，再加入适当添加剂，产生一定比例的金属氢氧化物，经过滤及水洗后，并加入适当添加剂予以解胶，使不同金属氢氧化物的特定成分发生水解、凝缩等反应，接着经干燥和煅烧，制成高品质的纳米级（nano meter、10—9）氧化铟锡粉末。本发明所述方法制备的氧化铟锡粉末具有更高的致密度。     

具有反射近红外功能浅色粉体的合成

采用水溶液共沉淀法合成了具有近红外反射功能的浅色氧化铟锡粉体材料。实验结果表明,最佳反应条件为：三氯化铟浓度0.25 mol/L,反应温度90℃～95℃,陈化时间2 h,陈化温度50℃,煅烧时间2 h,煅烧温度700℃～800℃,沉淀剂为尿素。     

铟盐促进的铱催化体系的研究

本文主要研究了铟盐促进的铱催化羰基合成醋酸的反应,研究了不同的铟化合物前体、铟与铱的比例,主催化剂铱浓度,助催化剂碘甲烷浓度、醋酸甲酯浓度和水含量对反应活性的影响。研究表明铟较好的促进铱催化羰基合成醋酸的反应,铟的前体优选氧化铟或醋酸铟,铱的浓度优选为1500ppm,铟:铱优选摩尔比为5:1,碘甲烷浓度优选9%～12%,醋酸甲酯浓度优选10%～15%,水浓度优选5%～2%,反应温度190℃～195℃,反应压力优选大于2.9MPa,反应活性与当前工业应用的铑催化剂基本相当,且催化剂的稳定性好。     

沉淀法制备氧化铟锡超细材料的研究进展

沉淀法是氧化铟锡超细材料（ITO）的主要制造方法。对该法工艺作了简要说明,分析了其中的主要影响条件,即反应物浓度、沉淀剂及分散剂、煅烧的温度和时间,并对主要影响条件作了量化说明。     

真空蒸馏法脱除金属铟中Cd、Zn、Tl、Pb的研究

通过理论论证了铟与镉、铊、铅、锌分离的可能性,研究了采用真空蒸馏的方法脱除镉、铊、铅、锌到4N精铟要求的工艺条件。实验表明,控制蒸馏温度1 000℃,恒温时间270 m in,可以将镉、铊、铅、锌的含量降到4N国家标准,整个过程中,金属铟的挥发率为9.44%。     

Rapid Formation and Growth of Bixbyite-Type (In0.67Fe0.33)2O3 by 28 GHz Microwave Irradiation

(In_0.67Fe_0.33)₂O₃ with the bixbyite structure was synthesized via 28 GHz microwave irradiation, using multimode microwave heating equipment. Indium sesquioxide strongly absorbs 28 GHz microwaves, and this strong coupling with microwave energy can be used to drive a reaction with iron sesquioxide. A mixture of In₂O₃ and α-Fe₂O₃ powders (In:Fe ratio of 2:1) was irradiated with microwaves at a frequency of 28 GHz. The mixture was heated to 1400°C during the microwave irradiation. The formation of a solid solution was completed within a minute, which indicated a drastic enhancement of the reaction rate. Scanning electron microscopy revealed remarkable grain growth under microwave irradiation.     

Investigations of Electrical Properties in Silica/Indium Tin Oxide Two-Layer Film for Effective Electromagnetic Shielding

The effect of zinc ions added to silica film on the electrical and structural properties of a silica/indium tin oxide two-layer film which had been prepared by solution coating for electromagnetic shielding of displays was studied. The volume resistivity of the undoped silica/indium tin oxide film was more than 3 times as high as that of the zinc-doped silica/indium tin oxide film. The addition of divalent cations, zinc ions, to the overcoated layer led volume resistivity of the two-layer film to decrease significantly and also caused a long-term increase in stability. The decrease in volume resistivity was due to the addition of zinc ions that changed the interface ionization and helped to enhance the electrical conductivity in the two-layer film.     

Fabrication of Low-Porosity Indium Tin Oxide Ceramics in Air from Hydrothermally Prepared Powder

Compositionally homogeneous indium tin oxide (ITO) ceramics with low porosity were obtained successfully by sintering hydrothermally prepared powders. The fabrication technique began with the preparation of microcrystalline, homogeneously tin-doped (5 wt%) indium oxyhydroxide powder, under hydrothermal conditions. Low-temperature (∼500°C) calcination of the hydrothermally derived powder led to the formation of a substitutional-vacancy-type solid solution of In₂Sn_{1− x} O_{5− y} , and further heating of this phase at temperatures of >1000°C resulted in the formation of the tin-doped indium oxide phase, which had the C -type rare-earth-oxide structure. The sintering of uniformly packed, calcined powder compacts at 1450°C for 3 h in air resulted in low-porosity (∼0.7%) ITO ceramics.     

n-InP在Fe~(3+)/Fe~(2+)溶液中光脉冲暂态行为研究 Ⅱ.负载电阻及还原态浓度的影响

本文应用光脉冲技术研究了负载电阻及还原态浓度对n-InP在Fe~(3+)/Fe~(2+)溶液中暂态行为的影响,结果表明,光电流表减呈双指数形式,增大负载电阻,峰值光电流减小,衰减时间常数增大。增大还原态浓度,峰值光电流增大,衰减时间常数减小。     

新型可见光活性In_2O_3-CaIn_2O_4复合光催化剂的制备及性能

通过化学共沉淀法原位合成了新型可见光活性的In2O3-CaIn2O4复合光催化剂.采用X射线衍射、扫描电子显微镜、电子能谱及紫外-可见漫反射光谱(diffuse reflectance spectroscopy,DRS)等测试手段对复合光催化剂进行了表征.以可见光(波长λ>400nm)为光源,甲基橙染料为目标降解物,考察了In2O3-CaIn2O4样品的光催化活性.结果表明:通过控制合成温度可得到不同In2O3和CaIn2O4相对含量的In2O3-CaIn2O4复合光催化剂,晶粒形貌呈立方体或长方体,粒径随合成温度升高而增加.DRS结果表明:复合光催化剂在可见光区具有良好的吸收性能.In2O3-CaIn2O4复合光催化剂具有良好的可见光催化活性;15b后,甲基橙的降解率达到了97%.这种新型复合光催化剂的可见光催化活性提高的原因,可能是由于催化剂中复合半导体结构的光生载流子高效分离造成的.     

锰铁炼制烟尘中铟的测定

本文研究了锰铁炼制烟尘中铟的测定方法。通过分析各种影响因素,得出最佳条件,并在此条件下对矿样进行了测定分析和讨论。     

液相沉淀法制备In2O3纳米粉

以无机盐为原料,采用液相沉淀法制备纳米In2O3粉体,研究了沉淀反应条件及沉淀后处理等对纳米In2O3粉体质量的影响.利用TG-DSC,FT-IR,XRD,SEM和EDS等分析手段对所制纳米In2O3粉体的结构、粒度、形貌、成分等进行了表征.结果表明:该法制备的In2O3纳米粉具有立方晶系结构、纯度较高、颗粒均匀呈球形、分散性良好、平均粒径为80 nm左右.     

Spray-combustion synthesis of indium tin oxide nanopowder

Nanocrystalline indium tin oxide (ITO) powders were prepared by a novel spray combustion method. Using single-drop study equipment, we studied the thermodynamics of the combustion reaction. The reaction can be ignited at air temperature as lower as 171.3°C when using urea and glucose as composite fuel. Once the reaction is ignited, the combustion temperature can surge to above 500°C, generating nanocrystalline ITO powders with grain size about 40 nm. Footages from high-speed camera demonstrated that the reaction is in three-step: moderate beginning, violent middle, and decaying end. It is also noticed that the ignition is very sensitive to the air temperature, even 0.2°C minus deviation may fail the combustion. The combustion reaction is self-sustainable, which saves the energy supply. And the low ignition temperature means the combustion reaction can be carried out in a conventional spray dryer. Our results provide a feasible way to mass production of nanocrystalline ITO powders, which as a methodology, may be extended to the production of other oxide nanopowders.