Affiliation: | a Department of Physics, Mahendra Engineering College, Tiruchengode - 637 503, Tamil Nadu, India b Centre for Nanoscience and Technology, Department of Physics, Periyar University, Salem - 636 011, Tamil Nadu, India c Department of Bioelectronics and Biosensors, Alagappa University, Karaikudi - 630 003, India d Nanotechnology Laboratory, Department of Physics, Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore 641020, Tamil Nadu, India |