一种简易的硫化亚锡微米棒薄膜的合成

为了得到高纯度的硫化亚锡薄膜,利用恒电压法成功制备了硫化亚锡微米棒薄膜,并将该薄膜在200℃真空退火1 h.结构和形貌分析表明:该薄膜是由2～5μm的细棒组成,并且优先沿着(101)晶面方向生长.拉曼光谱表明该薄膜具有较高的纯度.     

溶液法制备的ZnO微米棒的结构与光学性质

采用溶液法,以醋酸锌为原料,以六亚甲基四胺为催化剂,在93．5℃的水浴锅中加热5h,在硅衬底上生长了规则的ZnO微米棒,利用扫描电子显微镜观察了样品的结构形貌,利用X射线衍射分析了样品的结晶情况,利用荧光分光光度计测量了样品的光致发光谱,并分析了ZnO微米棒的形成机制和发光机理。     

Tailoring impedance match and enhancing microwave absorption of Fe3O4/ Bi24Fe2O39/Bi hollow porous microrods by controlling their composition

A self-assembly/precipitate conversion/decomposition process was developed for the controllable synthesis of Fe_3O_4/Bi_(24)Fe_2O_(39)/Bi hollow porous microrods(HPMRs).The results demonstrated that the crystal size,component,and performances of HPMRs could be effectively modulated via changing Fe~(2+)/Bi~(3+)molar ratio(γ).Fe_3O_4/Bi_(24)Fe_2O_(39)/Bi HPMRs exhibited ferromagnetic behavior at room temperature.As Bi and Bi_(24)Fe_2O_(39)contents increased withγ,the saturation magnetization M_sand attenuation constantly decreased,whereas coercivity H_cand impedance matching ratio increased.Compounding Fe_3O_4with small quantities of Bi and Bi_(24)Fe_2O_(39)into HPMRs can significantly enhance microwave absorption.Fe_3O_4/Bi_(24)Fe_2O_(39)/Bi HPMRs formed atγ=1:0.25 exhibited the optimum microwave absorption performance.The minimum R_Lwas-47.3 dB at8.72 GHz,corresponding to 2.4 mm sample thickness.The absorption band with the reflection loss below-20 dB was up to 14.0 GHz for the absorber with a thickness of 1.4-8.0 mm.The results demonstrate that the introduction of electromagnetic transparent materials(Bi_(24)Fe_2O_(39)or Bi)can improve the microwave absorption performances of Fe_3O_4 composites owing to enhanced impedance matching rather than attenuation constant.     

溶剂热法合成ZnO微米棒及其光催化性能

以ZnCl2和过氧化氢为反应前驱物,CTAB为表面活性剂,在碱性溶液中180℃反应12h,合成ZnO微米棒。利用X-射线粉末衍射(XRD),扫描电子显微镜(SEM),紫外可见吸收等手段对产物进行表征。通过扫描发现ZnO结构为具有六方纤锌矿结构,主要是由直径约在1μm左右粗细的单晶微米棒组成的花状ZnO微米团簇,并简单探讨了微米棒的组装过程。紫外吸附实验说明ZnO对有机染料,如甲基橙有催化作用,表明他们在光催化方面有潜在应用。     

高导电H3PMo12O40掺杂聚苯胺微米棒的合成与表征

分别以静电纺丝法制备的H3PMo12O40/ PVA和纯H3PMo12O40微米管为模板,制备了H3PMo12O40掺杂的聚苯胺微米棒材料,并运用红外光谱、X射线粉末衍射和扫描电镜进行了表征.四探针法测定了产品的电导率.结果表明:聚苯胺微米棒的直径在400 nm左右;最高电导率为3.3 S/ cm.     

硒微米棒的制备及其生长机制研究

以SeO2和硫脲为原料,在水热条件下制得了硒微米球;然后以硒微米球为硒源,在乙醇溶剂热条件下,通过溶解-晶化过程,获得了硒微米棒．粉体用X-射线粉末衍射（XRD）和光学显微镜（OM）进行了表征．硒微米棒的平均直径35μm,长度达毫米级．并用结晶学的观点讨论了硒微米棒的生长机制．