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Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films

Authorized Users Only
2018
Authors
Nikolić, Maria Vesna
Vasiljević, Zorka
Luković, Miloljub
Pavlović, Vera P.
Vujancevic, J.
Radovanović, M.
Krstić, Jugoslav
Vlahovic, B.
Pavlović, Vladimir B.
Article (Published version)
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Abstract
Pseudobrookite based nanopowder was obtained by solid state synthesis of starting hematite and anatase nanopowders in the weight ratio 55:45. Structural and morphological properties were analyzed using X-ray diffraction (XRD), BET, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, UV/Vis diffuse reflectance spectroscopy, Field emission scanning electron microscopy (FESEM) and Transmission electron microscopy (TEM) confirming the formation of nanocrystalline pseudobrookite. The obtained powder was mixed with a binder (ethyl cellulose), dispersant (α-terpinol) and adhesion agents (acetic acid and distilled water) to obtain a thick film paste. It was screen printed on alumina substrate with interdigitated PdAg electrodes and fired at 600 °C for 30 min. Formation of a porous nanocrystalline thick film structure was shown using Scanning electron microscopy (SEM), while Hall measurements enabled determination of carrier mobility. Change of impedance response in the frequency range ...42 Hz–1 MHz with humidity was analyzed at room temperature (25 °C) and 50 °C in the relative humidity range 30–90% and 40–90%, respectively. At 42 Hz, and room temperature the impedance reduced ∼28 times, while at 50 °C it reduced ∼147 times in the relative humidity range 40–90%. The sensor showed rapid response (16 s) and relatively low hysteresis (8.39% at 25 °C and 2.64% at 50 °C) showing that this is a promising material for application in humidity sensing.

Keywords:
Fe2TiO5 / Humidity sensor / Pseudobrookite / Thick film
Source:
Sensors and Actuators, B: Chemical, 2018, 277, 654-664
Publisher:
  • Elsevier B.V.
Projects:
  • Zero- to Three-Dimensional Nanostructures for Application in Electronics and Renewable Energy Sources: Synthesis, Characterization and Processing (RS-45007)
  • Lithium-ion batteries and fuel cells - research and development (RS-45014)
Note:
  • The peer-reviewed version: https://cer.ihtm.bg.ac.rs/handle/123456789/4277

DOI: 10.1016/j.snb.2018.09.063

ISSN: 0925-4005

WoS: 000453066700081

Scopus: 2-s2.0-85053789141
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/2414
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