1. Chemistry Department, Faculty of Mathematics and Science, Universitas Negeri Medan, Medan, North Sumatra, Indonesia
2. Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, Johor Bahru, Skudai, Johor, Malaysia
3. Centre for Sustainable Nanomaterials, Ibnu Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, Johor Bahru, Skudai, Johor, Malaysia