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Tuning of the electrical conductivity of Sr(Ti,Fe)O₃ oxygen sensing films by aerosol co-deposition with Al₂O₃

Title data

Exner, Jörg ; Schubert, Michael ; Hanft, Dominik ; Stöcker, Thomas ; Fuierer, Paul ; Moos, Ralf:
Tuning of the electrical conductivity of Sr(Ti,Fe)O₃ oxygen sensing films by aerosol co-deposition with Al₂O₃.
Event: 91. DKG Jahrestagung mit Symposium Hochleistungskeramik 2016 , 07.-09.03.2016 , Freiberg, Deutschland.
(Conference item: Conference , Poster )

Abstract in another language

Aerosol deposition (AD) is a very promising coating method to produce dense ceramic films at room temperature on a large variety of substrate materials directly from a ceramic powder. Making composite films by aerosol co-deposition of ceramics (AcDc) gives the opportunity to tune the physical and functional properties. Following previous work, mixtures of iron-substituted strontium titanate (STF) and alumina were prepared and sprayed to composite films. STF is a semiconducting oxygen sensing ceramic with a temperature independent but oxygen partial pressure (pO2) dependent conductivity at temperatures between 700 and 800 °C. By addition of non-conductive alumina in various amounts, composite films of STF35:Al2O3 with homogeneously distributed particle fractions were deposited. The mixing ratio of the powder was basically retained within the sprayed composite film. However, a tendency to improve the deposition of the minority component was observed, leading to a slight change in composition with an enrichment of this minority material in the composite film. Electrical conductivity of AcDc films was easily tunable with up to 60 vol.-% alumina, and the temperature independent oxygen sensing behavior, as observed in bulk ceramics, was retained. Furthermore, the oxygen sensing behavior is comparable to bulk materials matching previously reported slopes for STF35 of d(logσ)/d(pO2) = m(pO2) = 0.2 and the temperature independency remains. The conductivity can be reduced by approximately two decades. It was thus shown that AcDc has the ability to fine tune the electrical conductivity of sensors by creating a robust composite ceramic film with a controlled amount of passive filler. The approach may have additional advantages such as utilizing an inexpensive filler and increasing the wear resistance by incorporating a harder ceramic phase.

Further data

Item Type: Conference item (Poster)
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 14 Mar 2016 10:01
Last Modified: 07 Mar 2023 10:07