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Abstract
We report on the reproducible growth of superconducting (Bi1-xPbx)2Sr2CuO6+δ and (Bi1-xPbx)2Sr2Ca2Cu3O10+δ nanostructures, which has been a major difficulty in the electrochemical deposition of thin films of BSCCO. The precursors of superconducting Bi(Pb)-Sr-Ca-CuO were electrodeposited in an electrolytic bath prepared from the nitrate salts of the constituent metals in an organic solvent, dimethylsulfoxide (DMSO). The superconductor was electrodeposited in the form of nanotubes and nanowires. The as-deposited samples were given a controlled oxidative thermal treatment in air. The influence of deposition potential, annealing temperature and pH was studied and optimized to get the desired stoichiometry, 2201 and 2223 phase of superconducting Bi(Pb)-Sr-Ca-CuO. A novel three-step electrodeposition scheme was implemented to control the elemental stoichiometry specifically, the oxygen stoichiometry in the sample. Characterization of the electrodeposited and annealed nanostructures was done using XRD, EDS, SEM and PPMS. A plausible theoretical interpretation is given to explain the purpose behind the electrodepositing nanostructures.
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