List of Articles P. Geetha Devi Article 1 - Synthesis, structural and optical properties of pure ZnO and Co doped ZnO nanoparticles prepared by the co-precipitation method 10.1007/s40094-016-0221-0 P. Geetha Devi A. Sakthi Velu Journal of Theoretical and Applied Physics , Issue 1 , Year , Summer 2016