| Autor: |
Bhatt AS; Department of Chemistry, N.M.A.M. Institute of Technology (Visvesvaraya Technological University, Belagavi), Nitte 574110, India., Ranjitha R; Department of Chemistry, St. Aloysius College (Autonomous), Mangaluru 575003, India., Santosh MS; Centre for Incubation, Innovation, Research and Consultancy (CIIRC), Jyothy Institute of Technology, Thataguni, Off Kanakpura Road, Bangalore 560082, Karnataka, India., Ravikumar CR; Research Centre, Department of Chemistry, East West Institute of Technology, Bengaluru 560091, India., Prashantha SC; Research Centre, Department of Chemistry, East West Institute of Technology, Bengaluru 560091, India., Maphanga RR; Next Generation Enterprises and Institutions, Council for Scientific and Industrial Research, Pretoria 0001, South Africa.; Department of Physics, University of Limpopo, Private bag x 1106, Sovenga 0727, South Africa., Silva GFBLE; Polytechnic School of Engineering, University of São Paulo, São Paulo 05508-030, Brazil. |
| Abstrakt: |
Nanostructured NiO and Li-ion doped NiO have been synthesized via a facile microwave technique and simulated using the first principle method. The effects of microwaves on the morphology of the nanostructures have been studied by Field Emission Spectroscopy. X-ray diffraction studies confirm the nanosize of the particles and favoured orientations along the (111), (200) and (220) planes revealing the cubic structure. The optical band gap decreases from 3.3 eV (pure NiO) to 3.17 eV (NiO doped with 1% Li). Further, computational simulations have been performed to understand the optical behaviour of the synthesized nanoparticles. The optical properties of the doped materials exhibit violet, blue and green emissions, as evaluated using photoluminescence (PL) spectroscopy. In the presence of Li-ions, NiO nanoparticles exhibit enhanced electrical capacities and better cyclability. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) results show that with 1% Li as dopant, there is a marked improvement in the reversibility and the conductance value of NiO. The results are encouraging as the synthesized nanoparticles stand a better chance of being used as an active material for electrochromic, electro-optic and supercapacitor applications. |
