Tungsten oxide thin films were deposited on glass substrates by the magnetron sputtering of WO3 bulk at room temperature. The deposited films were annealed at different temperatures in air. The structural measurements indicate that the films annealed below 300℃ were amorphous, while the films annealed at 400 ℃ were mixed crystalline with hexagonal and triclinic phases of WO3. It was observed that the crystallization of the annealed films becomes more and more distinct with an increase in the annealing temperature. At 400 ℃, nanorod-like structures were observed on the film surface when the annealing time was increased from 60 min to 180 min. The presence of W=O stretching, W-O-W stretching, W-O-W bending and various lattice vibration modes were observed in Raman measurements. The optical absorption behaviors of the films in the range of 450-800 nm are very different with changing annealing temperatures from the room temperature to 400 ℃. After annealing at 400 ℃, the film becomes almost transparent. Increasing annealing time at 400 ℃ can lead to a small blue shift of the optical gap of the film.
采用超声水热/溶剂热过程使Zn(CH3COO)2,Eu2O3和H2NCSNH2在不同混合溶剂下反应,通过改变表面活性剂的浓度、原料配比、反应温度等变量成功制备了不同形貌的Zn S∶Eu2+样品。采用XRD、SEM对样品结构和形貌情况进行测试表征。结果表明:控制不同的反应条件可以合成包括颗粒、絮状、微球及一维条状等Zn S∶Eu2+形貌,其中乙二胺对形成微球形貌具有明显影响。使用荧光光谱仪分析在乙二胺/水/无水乙醇反应系统中制备的样品,结果表明掺杂3.5mol%Eu2+的样品呈蓝光,且在乙二胺为10 m L时发光最强。
