pH-sensitive properties of barium strontium titanate (BST) thin films prepared by pulsed laser deposition technique
- pH-sensitive properties of barium strontium titanate (BST) high-k thin films as alternative gate material for field-effect capacitive (bio-)chemical sensors based on an electrolyte-insulator-semiconductor system have been investigated. The BST films of different compositions (Ba0.31Sr0.69TiO3, Ba0.25Sr0.75TiO3 and Mg-doped Ba0.8Sr0.2Mg0.1Ti0.9O3) were deposited by pulsed laser deposition technique from targets fabricated by self-propagating high-temperature synthesis. The realised sensors have been electrochemically characterised by means of impedance-spectroscopy, capacitance–voltage and constant-capacitance method. The sensors possess a Nernstian-like pH sensitivity in the concentration range between pH 3 and 11 with a response time of 5–10 s. An equivalent circuit model for the BST-based capacitive field-effect sensor is discussed.
| Verfasserangaben: | Vahe V. Buniatyan, Maryam H. Abouzar, Norayr W. Martirosyan, Jürgen Schubert, Spartak Gevorgian, Michael Josef SchöningORCiD, Arshak PoghossianORCiD |
|---|---|
| DOI: | https://doi.org/10.1002/pssa.200983310 |
| ISSN: | 1862-6300 |
| Titel des übergeordneten Werkes (Englisch): | Physica Status Solidi (A) |
| Verlag: | Wiley-VCH |
| Verlagsort: | Berlin |
| Dokumentart: | Wissenschaftlicher Artikel |
| Sprache: | Englisch |
| Erscheinungsjahr: | 2010 |
| Datum der Publikation (Server): | 18.12.2012 |
| Jahrgang: | 207 |
| Ausgabe / Heft: | 4 |
| Erste Seite: | 824 |
| Letzte Seite: | 830 |
| Bemerkung: | Special Issue: Engineering of Functional Interfaces EnFI 2009 |
| Link: | https://doi.org/10.1002/pssa.200983310 |
| Zugriffsart: | campus |
| Fachbereiche und Einrichtungen: | FH Aachen / Fachbereich Medizintechnik und Technomathematik |
| FH Aachen / INB - Institut für Nano- und Biotechnologien | |
| collections: | Verlag / Wiley-VCH |
