Quality optimization of Bi2212 films prepared by aqueous solvent sol-gel method with nonionic surfactants |
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| Affiliation: | 1. Department of Materials Physics and Chemistry, School of Materials Science and Engineering and State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, Liaoning, 110819, People''s Republic of China;2. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang, 110819, PR China;3. Key Laboratory of Research and Application of Multiple Hard Films, College of Mechanical Engineering & Institute of Innovative Science and Technology, Shenyang University, Shenyang, 110044, PR China |
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| Abstract: | In this paper, Bi2212 films were prepared on LaAlO3(100) and SrTiO3(100) substrates by the sol-gel method using Bi(NO3)3·5H2O, Sr(NO3)2, Ca(NO3)2·4H2O and Cu(NO3)2·3H2O as raw materials. TritonX-100 (TX-100), fatty alcohol poly oxyethylene ether (AEO-9), poly (vinylpyrrolidone) (PVP) and poly (vinyl alcohol) (PVA) were used as surfactants, respectively, to improve the wettability between the sol and the substrate. When glycine and glycolic acid were used as complexing agents, these surfactants were stably miscible with the sols. The effects of different surfactant sol-gel systems on the wettability of substrates as well as the crystallinity, morphology, surface roughness and electrical transport properties of Bi2212 superconducting films were investigated. The results showed that flat and continuous c-axis epitaxial Bi2212 films were obtained using all these sol-gel systems. In particular, TX-100 and AEO-9 as surfactants showed stronger wettability of the sol-gel for both substrates. In addition, the films prepared using polymer surfactants PVP and PVA sol-gel systems showed less surface roughness. The same patterns were found in all the film samples prepared using precursor sols of different complexing agents, and all the films exhibited good electrical transport properties. This work lays a certain research foundation for the preparation of thin films by aqueous solvent sol-gel method. The method also shows great potential in terms of the stability of different sol-gel systems and the improvement of the wettability of different substrates. |
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| Keywords: | Aqueous sol-gel method Non-ionic surfactants Surface roughness Bi2212 superconducting films |
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