Presentation Information
[8a-P04-7]Synthesis and Characterization of Silicon-Rich Silica Nanoparticles from Padma River Sand
Md. Sakib Ahmed1, Md. Suman Islam1, 〇(PC)Abdul A Kuddus2, Shinichiro Mouri2, Abu Bakar Md. Ismail1 (1.Univ. of Rajshahi, 2.Ritsumeikan Univ.)
Keywords:
Magnesiothermic,Si-rich Silica,Sand
Silicon-rich silica, composed of nanoscale silicon crystallites in a silica matrix, exhibits valuable optical, electronic, and biocompatible properties. Conventional synthesis methods are costly and energy-intensive. In this study, silicon-rich silica nanoparticles (Si-rich SiO2 NPs) were synthesized from Padma River sand in Bangladesh using a sustainable, low-cost alkali fusion and magnesiothermic reduction process. XRD study confirmed polycrystalline silicon phases within amorphous silica, which was further confirmed by Raman and PL spectra having Si–Si bond dominance (520 cm-1) and emission peaks at 520 nm. Additionally, BET analysis revealed a surface area of 59.88 m2/g and an average pore size of 11.9 nm. TGA-DTA showed good thermal stability, and the zeta potential of –32.6 mV indicated strong colloidal stability. This green synthesis method offers a promising route for producing Si-rich SiO2 NPs for applications in optoelectronics, energy storage, and agriculture.