Ely Setyo Astuti, Achmad As'ad Sonief, M. Sarosa, Ngafwan Ngafwan, I.N.G. Wardana
This study aimed to reveal roles of KOH and HCl in a synthesis process of Silica Quantum Dots (Si-QDs) from environmentally friendly rice husk waste, the morphological characteristics, size and crystal structure of particles as well as the energy gap of Si-QDs. The results showed that High Energy Milling (HEM) caused electron excitation, delocalized bonding, nanocrack and fracture. KOH played a role in producing Si-QDs sizes around 0.386–2.5 nm. The most efficient hexagonal crystal structure absorbed the peak wavelength of about 250–400 nm and glowed a purplish-blue color. The Si-QDs produced Si and O content was 97 % with 3 % of K, Fe, and Ca impurities. The obtained energy gap 1.59–2.36 eV and HOMO-LUMO 127 99.5 kcal/mol. The smaller size of Si QDs, the higher energy gap which was associated with the quantum confinement effect. © 2022 Elsevier Ltd
Doctoral Student, Department of Mechanical Engineering, Brawijaya University, Jl. MT. Haryono no 167, East Java, Malang, 65145, Indonesia; Department of Mechanical Engineering, Brawijaya University, Jl. MT. Haryono 167, East Java, Malang, 65145, Indonesia; State Polytechnic of Malang, Jl. Soekarno Hatta 9, East Java, Malang, 65141, Indonesia; Department of Mechanical Engineering, Muhammadiyah University of Surakarta, Jl. A. Yani, Mendungan, Pabelan, Kartasura, Central Java, Sukoharjo, 67169, Indonesia