Open AccessKinetic Monte Carlo simulation of the growth of CdSe nanocrystals
Author(s) -
С. М. Асадов
Publication year - 2021
Publication title -
l.n. gumilev atyndaġy euraziâ u̇lttyk̦ universitetìnìn̦ habaršysy. himiâ, geografiâ, èkologiâ seriâsy
Language(s) - English
Resource type - Journals
eISSN - 2617-9962
pISSN - 2616-6771
DOI - 10.32523/2616-6771-2021-134-1-7-23
Subject(s) - nucleation , kinetic monte carlo , crystallization , cadmium selenide , materials science , thermodynamics , critical radius , reaction rate constant , nanocrystal , nanoparticle , desorption , monte carlo method , kinetics , chemistry , chemical physics , adsorption , nanotechnology , quantum dot , spheres , physics , statistics , mathematics , quantum mechanics , astronomy
This article is devoted to modeling the kinetics of colloidal crystallization of cadmium selenide (CdSe) nanoparticles (NPs). The kinetic equation is modified, considering the contributions of the reaction rate constants of individual stages. It includes the reaction rate constants, thermodynamic and calculated parameters, and physical properties. There is used modified kinetic model based on the crystallization equation. There are considered the contributions of adsorption, desorption, and migration of nucleated particles at different times. Modified model assumes that, upon crystallization of NPs CdSe, monomer units depend on the frequency of attachment and detachment transitions of the monomer–CdSe complex. In this case, the transformation of the precursor into a monomer, the formation of an effective monomer and nucleation pass into the growth stage of (NC CdSe) nanocrystals with a seeded mass. In the process, the resulting nanocluster will continue to grow due to early maturation, aging, and subsequent growth into larger NC CdSe. The Kinetic Monte Carlo method (KMC) is used to approximate the model of the nucleation–growth of NC considering different contributions to the reaction rate constants. The modified model with the use of KMC allows to describe the dependences of the kinetic rate constants on the average radius of nanoparticles as a function of time, concentration, and distribution of NC CdSe at a given time. There are described conditions for the formation of NPs CdSe with an evolutionary distribution function of NC CdSe in size space. The results of modeling the kinetics of colloidal crystallization of CdSe can be used to control nucleation rate and growth of NPs CdSe, as well as similar systems in the formation of high-quality NC.