TY  - CONF
AU  - Vojisavljević, Katarina
AU  - Wicker, Susanne
AU  - Barsan, Nicolae
AU  - Kmet, Brigita
AU  - Drnovšek, Silvo
AU  - Malič, Barbara
PY  - 2014
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2914
AB  - Cobalt oxide, Co3O4, which is known as a good CO catalyst, has in the past decade also drawn some research interest as a p-type metal oxide gas sensor. A powerful strategy to improve the sensor performance is the utilization of a nanocrystalline powder with a high surface to volume ratio. Thus, a strong interaction between the surrounding gas and the sensor material is enabled.
The nanocrystalline Co3O4 powder was synthesised by the nitrate-glycine self-sustained combustion route. The glycine/metal ion ratio was adjusted to provide stoichiometric or fuel-lean conditions of the redox reaction. During the rapid heating, the gels auto-ignited at approximately 250 oC (depending on the amount of the fuel) and spontaneously underwent a smouldering combustion with the evolution of large amounts of gases, subsequently forming a voluminous precursor powder. According to the X-ray diffraction analysis the phase-pure Co3O4 was obtained only when the precursor powder was prepared from the fuel-lean redox reaction. The field emission scanning electron micrographs revealed the spongy aspect of the calcined powder, where small primary particles formed the agglomerates. 
For the screen-printing, the Co3O4 powder was milled to break the agglomerates, and then mixed with the organic binder to achieve a viscous paste suitable for printing. The paste was screen printed onto Al2O3 substrates with interdigitated Pt electrodes for read-out of the resistance and a Pt heater for operation at well controlled temperatures, on the front and back-sides respectively. The about 50 µm thick films were fired at 400 oC in air. The phase composition was analysed by X-ray diffraction analysis and Fourier transformed infrared spectroscopy. The catalytic conversion of the Co3O4 powder and the sensor signal of the corresponding sensors were checked under different concentrations of the CO, CH4 and C2H5OH test gases.
PB  - Edition of Electromeramics Conference
C3  - Electroceramics XIV Conference 2014
T1  - Preparation of nanocrystalline Co3O4 powder and processing of thick films for sensor application
EP  - 17
SP  - 17
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2914
ER  - 

@conference{
author = "Vojisavljević, Katarina and Wicker, Susanne and Barsan, Nicolae and Kmet, Brigita and Drnovšek, Silvo and Malič, Barbara",
year = "2014",
abstract = "Cobalt oxide, Co3O4, which is known as a good CO catalyst, has in the past decade also drawn some research interest as a p-type metal oxide gas sensor. A powerful strategy to improve the sensor performance is the utilization of a nanocrystalline powder with a high surface to volume ratio. Thus, a strong interaction between the surrounding gas and the sensor material is enabled.
The nanocrystalline Co3O4 powder was synthesised by the nitrate-glycine self-sustained combustion route. The glycine/metal ion ratio was adjusted to provide stoichiometric or fuel-lean conditions of the redox reaction. During the rapid heating, the gels auto-ignited at approximately 250 oC (depending on the amount of the fuel) and spontaneously underwent a smouldering combustion with the evolution of large amounts of gases, subsequently forming a voluminous precursor powder. According to the X-ray diffraction analysis the phase-pure Co3O4 was obtained only when the precursor powder was prepared from the fuel-lean redox reaction. The field emission scanning electron micrographs revealed the spongy aspect of the calcined powder, where small primary particles formed the agglomerates. 
For the screen-printing, the Co3O4 powder was milled to break the agglomerates, and then mixed with the organic binder to achieve a viscous paste suitable for printing. The paste was screen printed onto Al2O3 substrates with interdigitated Pt electrodes for read-out of the resistance and a Pt heater for operation at well controlled temperatures, on the front and back-sides respectively. The about 50 µm thick films were fired at 400 oC in air. The phase composition was analysed by X-ray diffraction analysis and Fourier transformed infrared spectroscopy. The catalytic conversion of the Co3O4 powder and the sensor signal of the corresponding sensors were checked under different concentrations of the CO, CH4 and C2H5OH test gases.",
publisher = "Edition of Electromeramics Conference",
journal = "Electroceramics XIV Conference 2014",
title = "Preparation of nanocrystalline Co3O4 powder and processing of thick films for sensor application",
pages = "17-17",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2914"
}

Vojisavljević, K., Wicker, S., Barsan, N., Kmet, B., Drnovšek, S.,& Malič, B.. (2014). Preparation of nanocrystalline Co3O4 powder and processing of thick films for sensor application. in Electroceramics XIV Conference 2014
Edition of Electromeramics Conference., 17-17.
https://hdl.handle.net/21.15107/rcub_rimsi_2914

Vojisavljević K, Wicker S, Barsan N, Kmet B, Drnovšek S, Malič B. Preparation of nanocrystalline Co3O4 powder and processing of thick films for sensor application. in Electroceramics XIV Conference 2014. 2014;:17-17.
https://hdl.handle.net/21.15107/rcub_rimsi_2914 .

Vojisavljević, Katarina, Wicker, Susanne, Barsan, Nicolae, Kmet, Brigita, Drnovšek, Silvo, Malič, Barbara, "Preparation of nanocrystalline Co3O4 powder and processing of thick films for sensor application" in Electroceramics XIV Conference 2014 (2014):17-17,
https://hdl.handle.net/21.15107/rcub_rimsi_2914 .