1. Magister of Nanoscience and Nanotechnology, Graduate School, ITB, Jl. Ganesa No. 10, Bandung 40132, Indonesia
2. Advanced Functional Materials Research Group, Faculty of Industrial Technology, Institut Teknologi Bandung, Jl. Ganesa No. 10, Bandung 40132, Indonesia
3. Research Center for Nanoscience and Nanotechnology, ITB, Jl. Ganesa No. 10, Bandung 40132, Indonesia
4. Instrumentation and Control Research Group, Faculty of Industrial Technology, ITB, Jl. Ganesa No. 10, Bandung 40132, Indonesia