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International Conference on

Minerals, Metallurgy and Materials

March 22-24, 2021 | Valencia, Spain

Shehla Honey

Speaker for Materials Science Conference-Shehla Honey
Shehla Honey
Department of Physics, University of Okara, Pakistan
Title : Carbon Ions Irradiation-Induced Changes in Optical Transparency and Electrical Conductivity of Nickel Nanowires Mesh

Abstract:

This contribution reports on modifications in optical transparency and electrical conductivity of nickel nanowires mesh by irradiation with different fluencies of 5 MeV Carbon ions. The Carbon ions irradiations of Nickel Nanowires meshes are done at room temperature and beam fluencies of Carbon ions are varying from ~1x1014 ions/cm2 to ~1x1017 ions/cm2. Optical and electrical characterizations of Nickel Nanowires meshes are done using ultraviolet-visible (UV-VIS) spectroscopy and four probe techniques. Transmission electron microscopy (TEM) and x-ray diffraction (XRD) techniques are employed to describe the structural changes in Nickel Nanowires meshes before and after Carbon ions irradiation. Optical transparency is first decreased and then increased with increment in beam fluence of Carbon ions. Initially at low beam fluence of Carbon ions, the electrical conductivity of Ni-NWs mesh decreases and after that increases with increase in beam fluence.
The decrease in electrical conductivity is might be due to production and accumulation of defects in form of amorphous clusters into Ni-NWs by Carbon ions beam irradiation whereas the increase in electrical conductivity may be due to reduction in wire-wire contact resistance which occurred due to ion beam irradiation-induced coalescence or fusion of Ni-NWs at contact positions. At high beam fluence of Carbon ions, i.e., 1x1017, conductivity again starts decreasing due to slicing and melting of nanowires.
Ion beam irradiation technology is found to be a superb approach in order to modify electrical conductivity and optical transparency of meshes of Nickel Nanowires for application as transparent conducting electrodes.
Keywords: Nickel Nanowires; C+ Ions; Irradiation; Electrical Conductivity; Optical Transparency

Biography:

Dr. Shehla Honey is Assistant Professor of Physics at University of Okara, Pakistan. Her research focuses on ion irradiation-induced defects and characterize respective changes in physical properties of Nanowires (NWs), Nanorods (NRs) and Nanotubes (NTs) of metals and other 1D-nanostructures of various materials (e.g., semiconductor, metal oxides etc.) for applications in nanodevices.
During her MS research, she developed a novel, extremely effortless and inexpensive technique for the deposition of absorber layer of solar cell. She was a PhD Fellow at University of the Punjab, Lahore from 2012 to 2017, where she developed the large-scale metal nanowires (MNWs) networks for the first time using ion irradiation-induced nanoscale welding of NWs. She made important early advancement in the development of nanowires (MNWs) networks of various metals for application as transparent conducting electrodes in optoelectronic devices, improving electrical conductivities and optical transparencies. She was awarded fellowships of UNESCO UNISA AFRICA Chair in Nanosciences/Nanotechnology, UNESCO Paris France and fellowship of Nanosciences African Network (NANOAFNET), an ICTP network in 2015.
Her research now focuses on development of new materials for photovoltaic devices to break the conventional limits on efficiency of solar cell and also on energy storage and conversion devices.


 

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