1. Division of Inorganic and Physical Chemistry, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, Indonesia
2. Department of Chemistry, Universitas Timor, Kefamenanu, Indonesia
3. Department of Engineering Physics, Institut Teknologi Bandung, Bandung, Indonesia
4. Research Center for Nanoscience and Nanotechnology, Institut Teknologi Bandung, Bandung, Indonesia