1. Nanoscience and Technology Interdisciplinary Program; Graduate School; Chulalongkorn University; Phyathai Rd. Pathumwan 10330 Bangkok Thailand
2. National Metal and Materials Technology Center (MTEC); National Science and Technology Development Agency; Ministry of Science and Technology; 12120 Pathumthani Thailand
3. Department of Physics; Faculty of Science; Chulalongkorn University; Pathumwan 10330 Bangkok Thailand
4. Department of Advanced Materials Science; The University of Tokyo; 5-1-5 Kashiwanoha Kashiwa 277-8561 Chiba Japan