基板温度对SnO2:Sb薄膜结构和性能的影响

以单丁基三氯化锡(MBTC)和 SbCl3 为反应原料,采用常压化学气相沉积法(APCVD 法)在不同的基板温度下制备 Sb 掺杂 SnO2 薄膜,用 XRD、SEM表征了薄膜的结构和形貌,通过测量薄膜的方块电阻、载流子浓度、霍尔(Hall)系数、紫外可见光谱等性质,详细研究了基板温度对薄膜结构和光电性能的影响。实验表明 550℃以上制备的样品为多晶薄膜,并保持四方相金红石型结构;在 650℃下沉积的薄膜具有最低的方块电阻值,为 72Ω/□;在可见光区域薄膜透射率和反射率随着基板温度的提高均有所下降。     

Sol-Gel Synthesis and Luminescent Characteristic of Doped Eu^3 ＋ Silicate-Silica Phosphor

Silicagelphosphorsdopedrareearthionshave attractedgreatattentionofmanyresearchersdueto theseadvantages,suchashighersamplehomogeneity,purityandstable,efficientandenvironmentallyfriend lyphotoluminescencematrixmaterials,whichisless toxicleadtonetconversione…     

添加Fe3+对二氧化钛薄膜吸收光谱及光催化活性的影响

用阳极氧化法制备多孔状的纳米晶二氧化钛薄膜,通过往阳极氧化的电解液中添加Fe3 ,使其进入二氧化钛薄膜中,研究了掺杂Fe3 对二氧化钛薄膜吸收光谱和光催化活性的影响.在阳性氧化时通过往电解液中添加不同含量的Fe3 可以制得掺杂Fe3 浓度不同的薄膜,研究了掺杂Fe3 浓度不同对薄膜吸收光谱和光催化活性的影响.用X射线衍射、扫描电子显微镜、紫外-可见吸收光谱仪和X光电子能谱对薄膜进行了表征.实验发现掺杂Fe3 使二氧化钛薄膜对入射光的吸收带边发生红移,讨论了其作用机制.     

Electrical and optical characterization of Na: CuInS2 thin films grown by spray pyrolysis

The structural, electrical and optical properties of Na-doped CuInS₂ thin films grown by spray pyrolysis were studied. These films crystallized in the sphalerite structure of CuInS₂, and showed to contain traces of indium sulfide and CuIn₅S₈ as impurity phases. All films were In-rich and showed p-type conductivity. The film conductivity was strongly affected by Na-doping, which decreased from 10⁻² to 10⁻⁵ S/cm by increasing the [Na]/[Cu] ratio from 0.005 to 0.03 in the spray solution. The band gap energy was observed to increase, from 1.4 to 1.45 eV, with increasing the [Na]/[Cu] ratio. Our results suggested that Na could be an effective acceptor impurity in sprayed CuInS₂.     

Influence of TiO_2 on the Alkali Resistance and Structure of Invert Glass

1　IntroductionTheinvertglassisakindofglasswhosenumberofbridgeoxygenyisnotbiggerthan 3.WhenthereisonlyoneglassformerSiO2 ,itsmolarcontentisnomorethan66 .7% .Onthisoccasion ,theglassstructuremaychangefromthree dimensionalconsecutivenetworktolaminarnetwork (y =3) ,chainstructure (y =2 ) ,andislandstructure (y =0 ) [1].TheinfluenceofTiO2 onthealkaliresistanceandstructureintheinvertglasshasnotbeenreported .Thispaperwilldiscussitindetail.2　ExperimentalThematerialsusedwerechemicalpureSiO2 ,TiO…     

Influence of TiO<Subscript>2</Subscript> on the alkali resistance and structure of invert glass

Through measuring the alkali resistance of the invert glass and the quanity of SiO₂ and TiO₂ migrating fron the glass into the solution, the influence of TiO₂ on the alkali resistance of the glass is discussed and its structure is also analyzed by infrared spectroscopy. It is concluded that TiO₂ has double functions for the alkali resistance of the invert glass. On the one hand, both TiO₂ polarizing the secondary ions in glass and TiO₂ isomorphism replacement of SiO₂ make the alkali resitance of the glass decrease. On the ther hand, TiO₂ patching network and anti-erosion covering help to increase the alkali resistance. ZHAO Qing-lin: Born in 1972 Funded by the National Natural Science Foundation of China(No. 59372081)     

甲基红掺杂液晶E7的光限幅特性研究

研究了甲基红染料掺杂的液晶混合物E7对波长为 5 32nm的纳秒脉冲激光的光限幅特性 ,观察了激光通过液晶盒后的远场光强分布及其随入射光能量的变化。实验发现 ,对于厚度为 4 6 μm ,重量体积比为 6mg/ 0 5ml的甲基红染料掺杂的液晶混合物E7薄膜 ,其最初三次测试的箝位输出值分别为 0 70 μJ,1.0 0 μJ和 1 5 2 μJ ,输入限幅阈值在 2 3～ 2 8μJ之间。这种薄膜的极低箝位输出特性对用于人眼和传感器保护的光限幅应用很有意义     

锂离子电池正极材料Li1+xV3O8的研究进展

层状结构材料Li1 xV3O8有可能成为新一代锂离子电池正极材料。综述了锂离子电池正极材料的结构特点,重点介绍了国内外Li1 xV3O8的几种合成方法,分析了Li1 xV3O8的掺杂改性研究,总结了正极材料Li1 xV3O8的充放电工作原理,并展望了锂离子电池正极材料Li1 xV3O8未来应用前景。     

掺锆纳米TiO2制备表征及其对光催化活性的影响

本文采用溶胶-凝胶法制备纳米二氧化钛和掺锆二氧化钛粉末.TGA表征分析发现掺锆后二氧化钛吸附水量增加.SEM和BET表征显示掺锆粒子半径减小,比表面积增加.XRD分析发现掺锆后的衍射峰宽化,晶粒变小,与SEM和BET结果吻合,还发现掺锆抑制了二氧化钛晶相转变.光催化降解亚甲基蓝结果表明,当锆掺杂浓度在5%,焙烧温度530℃时,掺锆二氧化钛催化活性最高.     

An investigation of Eu-doped CaAlSiN3 fabricated by an alloy-nitridation method

We have synthesized CaAlSiN₃:Eu phosphors through an alloy-nitridation method with stable alloys as main starting materials, and investigated their crystal structures and photoluminescence properties in three aspects as below: (1) different Eu concentrations; (2) different Eu dopants; (3) different Al/Si molar ratios. The lattice volume calculated by using Rietveld refinement on the base of XRD analysis, decreases with oxygen incorporating, increases with the Al/Si ratios, and shows a limited expansion with the raise of Eu concentrations in CaAlSiN₃:Eu crystal lattice. The concentration quenching and the shifts of emission bands are investigated and discussed in details. The different lattice volumes deriving from corresponding compositions have an important effect on photoluminescence properties. This work provides some methods to tune the emission wavelengths of CaAlSiN₃:Eu phosphors.