Preparation of nano-t-Se with different particle sizes and particle size dependence of the melting thermodynamics

摘要: Selenium nanomaterials have unique optical, electrical, magnetic and healthcare functions. with different particle sizes properties performances, the thermal stability of selenium nanoparticles has a key impact on their performances. In this paper, nano-t-Se was prepared by precursor-ultrasonic conversion method. Firstly, effects reducing agent dosage, ultrasonic frequency time were studied, t-Se prepared. Then, melting thermodynamic determined DSC. The influence temperature discussed. experimental results showed that method reliable for preparing sizes. By controlling amount agent, time, controllable preparation required can be realized. It found had significant nano-t-Se, temperature, enthalpy entropy decreased decrease sizes, respectively. When from 52.1 nm to 17.4 nm, initial 218.02 °C 213.82 °C, 5.496 kJ mol−1 3.962 mol−1, 5.182 J K−1 4.136 K−1. Besides, it also good linear relationship reciprocal in size range, dependence provide important guidance preparation, research application nano-t-Se.