物理化学学报 >> 2003, Vol. 19 >> Issue (04): 315-319.doi: 10.3866/PKU.WHXB20030407

研究论文 上一篇    下一篇

线性升温条件下纳米ZnSe的生成动力学

李焕勇;胡荣祖;张红;介万奇   

  1. 西北工业大学凝固技术国家重点实验室,西安 710072;西北大学化学系,西安 710069
  • 收稿日期:2002-07-17 修回日期:2002-10-14 发布日期:2003-04-15
  • 通讯作者: 李焕勇 E-mail:lihuanyong3996@sina.com.cn

Kinetics of Formation of ZnSe Nanocrystals under Linear Temperature Increase Condition

Li Huan-Yong;Hu Rong-Zu;Zhang Hong;Jie Wan-Qi   

  1. State key laboratory of Solidification Processing, Northwest Polytechnical University, Xi′an 710072;Chemistry Department of Northwest University, Xi′an 710069
  • Received:2002-07-17 Revised:2002-10-14 Published:2003-04-15
  • Contact: Li Huan-Yong E-mail:lihuanyong3996@sina.com.cn

摘要: 用非等温TG-DTG技术,在5.0、10.0、15.0和20.0 K•min-1 4个不同线性升温条件下,研究了从配合物ZnSe(C2H8N2)制备纳米ZnSe的过程动力学.结果表明: 该过程为三维扩散机理;机理函数为反Jander方程, f(α)= ,G(α)= ;表观活化能E=209.61 kJ•mol-1,指前因子A=1015.7 s-1,动力学方程为 ,并用结果解释了实验现象.初次报导了纳米ZnSe在420 ℃左右氧化为粒度低于40 nm的纳米ZnO.

关键词: 纳米ZnSe, 生成过程, 热分析动力学, TG-DTG

Abstract: The kinetics of formation of ZnSe nanocrystals from the complex ZnSe (C2H8N2) has been investigated by means of non-isothermal TG-DTG at various heating rates of 5.0,10.0,15.0 and 20.0 ℃•min-1.The results show that the formation of ZnSe nanocrystals was controlled by three-dimension diffusion. The most probable kinetic function in differential form, and in integral form, the apparent activation energy (E) and the pre-exponential constant (A) of the process are f (α)= ,G(α)= ,209.61 kJ•mol-1 and 1015.7 s-1, respectively. The kinetics equation is . The calculated results are in accordance with the experiments. ZnO nanocrystal with less than 40 nm sizes has also been obtained from ZnSe nanocrystals.

Key words: ZnSe nanocrystals, Process of ZnSe formation, Thermoanalysis kinetics,  TG-DTG