1. Department of Physics, COMSATS University Islamabad, Lahore Campus, Lahore 54000, Pakistan
2. Department of Physics, Government College University, Faisalabad 38000, Pakistan
3. Department of Applied Chemistry, Government College University, Faisalabad 38000, Pakistan
4. Department of Applied Physics and Department of Bionanotechnology, Hanyang University, Ansan, Kyunggi-Do 15588, South Korea