Block copolymer self-assembly-directed synthesis of mesoporous gyroidal superconductors
| Autor: | Francis J. DiSalvo, Robert B. van Dover, Robbins Spencer, Peter A. Beaucage, Kwan Wee Tan, Hiroaki Sai, Jörg G. Werner, Ulrich Wiesner, James P. Sethna, Sol M. Gruner |
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| Rok vydání: | 2015 |
| Předmět: |
Superconductivity
Niobium nitride Materials science Polymers Niobium chemistry.chemical_element Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences chemistry.chemical_compound Copolymer Niobium oxide Superconductors Research Articles chemistry.chemical_classification Multidisciplinary SciAdv r-articles Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Self-assembly 0210 nano-technology Mesoporous material Porosity Research Article |
| Zdroj: | Science Advances |
| ISSN: | 2375-2548 |
| Popis: | Block copolymer self-assembly is used to synthesize three-dimensionally continuous gyroidal mesoporous superconductors of niobium nitride. Superconductors with periodically ordered mesoporous structures are expected to have properties very different from those of their bulk counterparts. Systematic studies of such phenomena to date are sparse, however, because of a lack of versatile synthetic approaches to such materials. We demonstrate the formation of three-dimensionally continuous gyroidal mesoporous niobium nitride (NbN) superconductors from chiral ABC triblock terpolymer self-assembly–directed sol-gel–derived niobium oxide with subsequent thermal processing in air and ammonia gas. Superconducting materials exhibit a critical temperature (Tc) of about 7 to 8 K, a flux exclusion of about 5% compared to a dense NbN solid, and an estimated critical current density (Jc) of 440 A cm−2 at 100 Oe and 2.5 K. We expect block copolymer self-assembly–directed mesoporous superconductors to provide interesting subjects for mesostructure-superconductivity correlation studies. |
| Databáze: | OpenAIRE |
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