Kinetics of formation of ZnSe nanocrystals under linear temperature increase condition

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°C·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) = {3/2(1 + α)^2/3[(1 + α)^1/3 - 1]^-1}, G(α) = [(1 + α)^1/3 - 1]², 209.61 kJ·mol^-1 and 10^15.7 s^-1, respectively. The kinetics equation is dα/dt = 10^15.7{3/2(1 + α)^2/3[(1 + α)^1/3 - 1]^-1}exp(-25211.7/T) The calculated results are in accordance with the experiments. ZnO nanocrystal with less than 40 nm size has also been obtained from ZnSe nanocrystals.