1. Department of Physics, University of Riau, Simpang Baru, Indonesia
2. Department of Metallurgy and Materials Engineering, Faculty of Engineering, Universitas Indonesia, Depok, Indonesia
3. Research Center for Biomass and Bioproduct, National Research and Innovation Agency (BRIN), Cibinong, Indonesia
4. Research Centre for Physics, Indonesian Institute of Sciences, South Tangerang, Indonesia