Liquid-feed flame spray pyrolysis derived nanopowders (NPs) as a route to electrically conducting calcium aluminate (12CaO.7Al2O3) films
Autor: | Richard M. Laine, John Kieffer, Eongyu Yi, Eleni Temeche, Vazrik Keshishian |
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Rok vydání: | 2019 |
Předmět: |
010302 applied physics
Materials science Aluminate 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences law.invention Pulsed laser deposition Liquid-feed flame spray pyrolysis Ion chemistry.chemical_compound chemistry Chemical engineering law 0103 physical sciences Materials Chemistry Ceramics and Composites Irradiation Crystallization 0210 nano-technology Thermal spraying Pyrolysis |
Zdroj: | Journal of the European Ceramic Society. 39:1263-1270 |
ISSN: | 0955-2219 |
DOI: | 10.1016/j.jeurceramsoc.2018.11.051 |
Popis: | Traditionally, C12A7 materials have been processed via solid-state reaction followed by pulsed laser deposition (PLD) or floating zone (Fz) crystallization methods at high temperature, high cost approaches to single-phase films. These techniques require a significant number of process steps to generate C12A7:e− materials that have been shown to exhibit exceptional electrical conductivities as high as 1 S/cm. We demonstrate here an effective alternative method using flame made C12A7 nanopowders (NPs) produced via liquid-feed flame spray pyrolysis (LF-FSP). Nearly fully dense, single phase, and transparent C12A7 films ( ℃ /3 h/O2. Subsequent heat treatments in 20/80 H2/N2 replaces cage trapped O2- ions forming C12A7:H− followed by UV irradiation to generate C12A7:e− with electrical conductivities of 35 mS cm-1. C12A7:e- appears to belong to a new class of transparent conducting oxides (TCOs) that may offer commercial potential on further optimization due to low materials and processing costs, environmental stability, and natural abundance when processed efficiently. |
Databáze: | OpenAIRE |
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