Title : Carbon Ions Irradiation-Induced Changes in Optical Transparency and Electrical Conductivity of Nickel Nanowires Mesh
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