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Dual-Activity Controlled Asymmetric Synthesis of Superconducting Lead Hemispheres**

Authors

  • X. L. Lu,

    1. Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026 (P.R. China)
    2. International Center for Materials Physics, Academia Sinica, Shenyang 110015 (P.R. China)
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  • W. Wang,

    1. Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026 (P.R. China)
    2. International Center for Materials Physics, Academia Sinica, Shenyang 110015 (P.R. China)
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  • G. Q. Zhang,

    1. Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026 (P.R. China)
    2. International Center for Materials Physics, Academia Sinica, Shenyang 110015 (P.R. China)
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  • X. G. Li

    1. Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026 (P.R. China)
    2. International Center for Materials Physics, Academia Sinica, Shenyang 110015 (P.R. China)
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  • This work was supported by the National Natural Science Foundation of China (50421201 and 10334090) and the National Basic Research Program of China (2006CB601003 and 2006CB922005).

Abstract

A binary surfactant mixture of cetyltrimethylammonium bromide and polyvinyl pyrrolidone is used as the tailoring agent in the fabrication of lead micro/nanostructures. Electron microscopy studies indicate that the morphologies of the products can be efficiently controlled in this simple one-step synthetic procedure. Intriguingly, well-defined asymmetric functional colloids, Pb hemispheres, are obtained for the first time, and a dual-activity-controlled growth process is proposed to explain their formation. The magnetization measurements show that the as-prepared samples are superconducting with the same transition temperature as bulk Pb. These findings prove the unique morphology tailoring efficacy of mixed surfactants, which could be used to obtain more variform structures or architectures in the fabrication of advanced materials.

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