1. Department of Physics, Government College for Women (Affiliated to University of Kerala), Thiruvananthapuram, Kerala 695014, India
2. Department of Engineering, School of Engineering and Technology, Sunway University, No. 5 Jalan Universiti, Bandar Sunway, 47500 Selangor Darul Ehsan, Malaysia
3. Research Centre for Nano-Materials and Energy Technology (RCNMET), School of Engineering and Technology, Sunway University, No. 5 Jalan Universiti, Bandar Sunway, 47500 Selangor Darul Ehsan, Malaysia
4. School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
5. Department of Physics, JAIN (Deemed-to-be University), Bangalore, Karnataka 560004, India