以无水硝酸镧、1-丁基-3-甲基咪唑六氟磷酸(BMIMPF6)和助溶剂丙酮为电解液,在室温(298 K)下电沉积制得镧金属薄膜。电解液BMIMPF6的电化学窗口为-2.5~1.5 V vs. Pt,La^(3+)还原为La^(2+)发生于-1.7 V vs. Pt,La^(2+)还原为La0发生于-2.1...以无水硝酸镧、1-丁基-3-甲基咪唑六氟磷酸(BMIMPF6)和助溶剂丙酮为电解液,在室温(298 K)下电沉积制得镧金属薄膜。电解液BMIMPF6的电化学窗口为-2.5~1.5 V vs. Pt,La^(3+)还原为La^(2+)发生于-1.7 V vs. Pt,La^(2+)还原为La0发生于-2.1 V vs. Pt。BMIMPF6的低吸湿性有利于在空气气氛下电沉积镧。使用扫描电子显微镜和光学显微镜观察到所制备的薄膜织构致密,经能量色散谱和X射线光电子能谱对沉积薄膜进行了表征,确定了薄膜中含有大量镧元素。通过探究电压扫描速率和硝酸镧浓度对La^(3+)的电化学行为的影响,证明La^(3+)的还原反应是一个受物质扩散控制的不可逆过程,La^(3+)在BMIMPF6中的扩散系数为1.47×10^(-9) cm^(2)·s^(-1)。本研究为获得金属镧薄膜和镧氧化物薄膜提供了一种简便的方法,并且有望用于电沉积制备其它镧系元素薄膜。展开更多
A Monte Carlo study on the crossover from 2-dimensional to 3-dimensional aggregations of clusters is presented. Based on the traditional cluster-cluster aggregation （CCA） simulation, a modified growth model is propo...A Monte Carlo study on the crossover from 2-dimensional to 3-dimensional aggregations of clusters is presented. Based on the traditional cluster-cluster aggregation （CCA） simulation, a modified growth model is proposed. The clusters （including single particles and their aggregates） diffuse with diffusion step length 1 （1≤l≤7） and aggregate on a square lattice substrate. If the number of particles contained in a cluster is larger than a critical size Sc, the particles at the edge of the cluster have a possibility to jump onto the upper layer, which results in the crossover from 2-dimensional to 3-dimensional aggregations. Our simulation results are in good agreement with the experimental findings.展开更多
We study the iron atomic aggregates deposited on silicone oil surfaces by using atomic force microscopy. The aggregates are composed of disk-shaped nanoparticles with the mean diameter Φc≈31.7 nm and height Hc≈4.5 ...We study the iron atomic aggregates deposited on silicone oil surfaces by using atomic force microscopy. The aggregates are composed of disk-shaped nanoparticles with the mean diameter Φc≈31.7 nm and height Hc≈4.5 nm, which are nearly independent of the nominal film thickness. The experiment shows that a material condensation process must occur in the nanoparticles during the growth period. The anomalous phenomenon is explained.展开更多
基金supported by the National Magnetic Confinement Fusion Energy R&D Program(2022YFE03170004)the National Natural Science Foundation of China(22109146)the Foundation from Institute of Materials,China Academy of Engineering Physics(TP03201703,TP03201802,JBNY0602,and CX2019018)。
基金National Key Research and Development Program (2017YFE0301506)National Natural Science Foundation of China (21573223)Foundation from Institute of Materials CAEP (TP01201603, TP03201703)。
文摘以无水硝酸镧、1-丁基-3-甲基咪唑六氟磷酸(BMIMPF6)和助溶剂丙酮为电解液,在室温(298 K)下电沉积制得镧金属薄膜。电解液BMIMPF6的电化学窗口为-2.5~1.5 V vs. Pt,La^(3+)还原为La^(2+)发生于-1.7 V vs. Pt,La^(2+)还原为La0发生于-2.1 V vs. Pt。BMIMPF6的低吸湿性有利于在空气气氛下电沉积镧。使用扫描电子显微镜和光学显微镜观察到所制备的薄膜织构致密,经能量色散谱和X射线光电子能谱对沉积薄膜进行了表征,确定了薄膜中含有大量镧元素。通过探究电压扫描速率和硝酸镧浓度对La^(3+)的电化学行为的影响,证明La^(3+)的还原反应是一个受物质扩散控制的不可逆过程,La^(3+)在BMIMPF6中的扩散系数为1.47×10^(-9) cm^(2)·s^(-1)。本研究为获得金属镧薄膜和镧氧化物薄膜提供了一种简便的方法,并且有望用于电沉积制备其它镧系元素薄膜。
基金National Key Research and Development Program of China (2017YFA0303104)National Natural Science Foundation of China (11904335,11974319, 21903074, 11774320, 11904334, 12122409, 11874330)Special Funds of Institute of Materials (TP02201905)。
基金supported by the National Natural Science Foundation of China(Grant Nos.11374082 and 11074215)the Science Foundation of Zhejiang Province Department of Education,China(Grant No.Y201018280)+1 种基金the Fundamental Research Funds for Central Universities,China(Grant No.2012QNA3010)the Specialized Research Fund for the Doctoral Program of Higher Education of China(Grant No.20100101110005)
文摘A Monte Carlo study on the crossover from 2-dimensional to 3-dimensional aggregations of clusters is presented. Based on the traditional cluster-cluster aggregation （CCA） simulation, a modified growth model is proposed. The clusters （including single particles and their aggregates） diffuse with diffusion step length 1 （1≤l≤7） and aggregate on a square lattice substrate. If the number of particles contained in a cluster is larger than a critical size Sc, the particles at the edge of the cluster have a possibility to jump onto the upper layer, which results in the crossover from 2-dimensional to 3-dimensional aggregations. Our simulation results are in good agreement with the experimental findings.
基金Project supported by the National Natural Science Foundation of China(Grant No.11074215)the Fundamental Research Funds for Central Universities of Ministry of Education of China(Grant No.2012QNA3010)
文摘We study the iron atomic aggregates deposited on silicone oil surfaces by using atomic force microscopy. The aggregates are composed of disk-shaped nanoparticles with the mean diameter Φc≈31.7 nm and height Hc≈4.5 nm, which are nearly independent of the nominal film thickness. The experiment shows that a material condensation process must occur in the nanoparticles during the growth period. The anomalous phenomenon is explained.
