With the colloidal suspension of superconducting nanoparticles as a precursor, we have successfully fabricated well-oriented high-Tc superconducting Bi2Sr2CaCu2Oy films by an electrophoretic deposition method. The colloidal suspension of superconducting nanoparticles can be prepared by the exfoliation of Bi-based cuprates through the intercalation of long chain organic molecules. According to zeta potential measurement, the surface of the resulting nanosheets in an acetone solvent is positively charged with a potential of + 25 mV. Such a presence of surface charge allows us to apply the electrophoretic deposition process with a silver metal substrate. A post-annealing process for the as-deposited film improves significantly the electrical connectivity and the c-axis alignment of the superconductor grains. The thickness of the resulting films can be easily tuned by the control of deposition conditions such as an applied electrical potential and a deposition time.
Bibliographical noteFunding Information:
This work is financially supported by a grant from the ETEP institute in Korea Electric Power Research Institute (KEDPRI) and partly by the Korean Ministry of Science and Technology through the STAR project. BK 21 fellowship for J.J.C. is also appreciated.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Metals and Alloys
- Materials Chemistry