2019 年 44 巻 4 号 p. 129-132
Si nanoparticles were synthesised by the Mg reduction process of SiO2 powder extracted from rice husks and their optical properties and crystal structures were studied. Room temperature luminescence was observed from the Si nanoparticles formed by Mg reduction of the SiO2 powder with reduction temperatures of 550 ℃ and 700 ℃. Transmission electron microscopy observation of the SiO2 powder extracted from rice husks revealed that an aggregate consisting of numerous SiO2 nanoparticles was formed. The formation of crystalline Si nanoparticles and the aggregate by Mg reduction of the SiO2 nanoparticles was confirmed. Mg reduction of SiO2 powder extracted from rice husks is an effective method for the simple and large-scale preparation of luminescent Si nanocrystals by using the nano-bio structure of live rice plants.