Optical and gas-sensing properties, and electronic structure of the mixed-phase CaCu{sub 3}Ti{sub 4}O{sub 12}/CaTiO{sub 3} composites

Journal Article · Fri Sep 15 00:00:00 EDT 2017 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2017.04.037· OSTI ID:22730379

Oliveira, L. H. ^[1]; Ramírez, M. A. ^[2]; Ponce, M. A.; Ramajo, L. A. ^[3]; Albuquerque, A. R. ^[4]; Sambrano, J. R. ^[5]; Longo, E. ^[1]; Castro, M. S. ^[3]

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1. State University of São Paulo, Chemistry Institute, rua Prof. Francisco Degni 55, 14800-905, Araraquara, SP (Brazil)
2. State University of São Paulo, Engeenering Collegue of Guaratinguetá, rua Ariberto Pereira da Cunha, 12516-410, Guaratinguetá, SP (Brazil)
3. University of Mar del Plata, Institute of Materials Science and Technology, J.B. Justo 4302, Mar del Plata, Buenos Aires B7608FDQ (Argentina)
4. Federal Institute of Education, Science and Technology of Sertão Pernambucano, 56400-000 Floresta, PE (Brazil)
5. Modeling and Molecular Simulations Group, São Paulo State University, UNESP, 17033-360 Bauru, SP (Brazil)

Highlights: • CCTO/CTO composites were synthesized by a solid-state reaction using various milling durations. • These composites have a broad PL emission band located at 450 nm. • CCTO/CTO material was deposited onto an alumina substrate using a screen-printing technique, and hence, could be structured for gas-sensing applications. • Our theoretical findings may further elucidate the electronic structure associated with the interfacial band alignment (type I-straddling gap). - Abstract: Combined experimental and theoretical investigations were conducted on the electronic structure, as well as the optical and gas-sensing properties of mixed-phase CaCu{sub 3}Ti{sub 4}O{sub 12}/CaTiO{sub 3} (CCTO/CTO) composites, which were synthesized by a solid-state reaction using various milling durations. Our results revealed that these CCTO/CTO composites have a broad photoluminescence (PL) emission band located at 450 nm, which is strongly influenced by the milling process duration. Scanning electron microscopy images confirmed that the use of longer milling durations favored the formation of pores and increased the active surface area of the CCTO/CTO thick films. The thick films were prepared using the screen-printing technique, and hence, could be structured for gas-sensing applications. Our theoretical findings may further elucidate the electronic structure associated with the interfacial band alignment (type I-straddling gap) of the CCTO/CTO composite systems.

• OSTI ID: 22730379
• Journal Information: Materials Research Bulletin, Vol. 93; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
ELECTRONIC STRUCTURE
MILLING
SCANNING ELECTRON MICROSCOPY
SCREEN PRINTING
SURFACE AREA
SYNTHESIS