Annealing temperature influence on the degree of inhomogeneity of the Schottky barrier in Ti/4H–SiC contacts

Tung＇s model was used to analyze anomalies observed in Ti/Si C Schottky contacts. The degree of the inhomogeneous Schottky barrier after annealing at different temperatures is characterized by the ‘T0anomaly＇ and the difference（△Φ）between the uniformly high barrier height（Φ0B） and the effective barrier height（Φeff B）. Those two parameters of Ti Schottky contacts on 4H–Si C were deduced from I–V measurements in the temperature range of 298 K–503 K. The increase in Schottky barrier（SB） height（ΦB） and decrease in the ideality factor（n） with an increase measurement temperature indicate the presence of an inhomogeneous SB. The degree of inhomogeneity of the Schottky barrier depends on the annealing temperature, and it is at its lowest for 500-°C thermal treatment. The degree of inhomogeneity of the SB could reveal effects of thermal treatments on Schottky contacts in other aspects.     

过硫酸盐增强花状MnCo2O4可见光降解性能

为了充分利用光降解技术与过硫酸盐氧化技术耦合的优势，成功制备了具有3D中空结构的花状MnCo₂O₄催化剂(HF-MnCo₂O₄)。在可见光照射下，HF-MnCo₂O₄能够有效地活化过硫酸钾(PS)。将PS引入光催化体系(HF-MnCo₂O₄/PS/Vis)，可以降低光生e^-/h⁺对的复合机率，同时也增加该体系的活性物种数量。以亚甲基蓝(MB)为目标物，考察了HF-MnCo₂O₄/PS/Vis耦合体系的光催化性能。得益于MnCo₂O₄独特的分级结构及MnCo₂O₄和PS之间协同效应，HF-MnCo₂O₄/PS/Vis耦合体系对MB展现出较好的降解去除能力，可见光照射50 min对MB的去除率达到96...     

电感耦合等离子体质谱法测定多西他赛注射液中17种元素

建立电感耦合等离子体质谱（ICP-MS）法测定多西他赛注射液中17种元素（Al、As、Ba、Cd、Co、Cr、Cu、Fe、Hg、Li、Mn、Ni、Pb、Sb、Tl、V、Zn）。采用浓硝酸与过氧化氢作为消解液，经微波消解处理样品后，用ICP-MS法进行测定。Hg质量浓度在0.05～4 ng/mL范围内、其余16种元素质量浓度在0.5～40 ng/mL范围内线性关系良好，相关系数均大于0.999，各元素的检出限为0.000 5～0.6 mg/kg，样品加标回收率为92.2%～108.8%，测定结果的相对标准偏差为1.1%～2.8%。该方法操作简便，线性范围宽，分析速度快，灵敏度高，可同时测定多种元素，适用于多西他赛注射液中多种元素的测定。