Nanocomposite Zn2SnO4/SnO2 Thick films as a Humidity Sensing Material
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AuthorsNikolić, Maria Vesna
Vasiljević, Zorka Ž.
Luković, Miloljub D.
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Nanocomposite Zn2SnO4/SnO2 powder was obtained by solid state synthesis from homogenized starting nanopowders of ZnO and SnO2 mixed in the 1:1 molar ratio, structurally and morphologically characterized using X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). Thick film paste was made by adding organic vehicles to the obtained powder. Three to five layers (layer thickness approx. 12 μm) were screen printed on alumina substrate with small test PdAg electrodes and fired at 600°C for 30 minutes. SEM analysis confirmed formation of a porous structure suitable for humidity sensing. Impedance response was studied at the working temperatures of 25 and 50°in a humidity chamber where the relative humidity (RH) was 30-90% and measured frequency 42 Hz - 1 MHz. With increase in film thickness the overall sensor impedance increased. It reduced at 100 Hz from 36 to 0.25 MΩ (60 μm), from 23.4 to 0.25 MΩ (48 μm) and from 6.8 to 0.02 MΩ (36 μm) at 25°C, while at 50°C the overall measured i...mpedance was lower, and reduced from 14 MΩ to 0.72 MΩ (48 μm) for RH 30 and 90%, respectively. The response (8 s) and recovery (10 s) was fast, showing that this nanocomposite has potential for application in humidity sensing.
Keywords:alumina substrate / electrodes / film thickness / firing (materials) / frequency measurement / humidity / humidity sensing material / humidity sensors / Impedance / layer thickness / metals / molar ratio / morphological properties / nanocomposite / nanocomposites / nanofabrication / nanoporous materials / nanopowders / nanosensors / organic vehicles / PdAg electrodes / porous structure / powders / Powders / relative humidity / scanning electron microscopy / SEM / Sensors / solid state method / structural properties / surface morphology / thick film paste / thick films / Thick films / tin compounds / X-ray diffraction / XRD / zinc compounds / Zn2SnO4-SnO2
Source:2019 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS), 2019, 1-3
- Zero- to Three-Dimensional Nanostructures for Application in Electronics and Renewable Energy Sources: Synthesis, Characterization and Processing (RS-45007)
- Peer-reviewed manuscript: http://dais.sanu.ac.rs/handle/123456789/6688
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