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/123456789/2909
AB  - Cobalt oxide, Co3O4, has shown great potentials for various practical applications due to excellent
electronic, magnetic and redox properties. Its high catalytic activity in combustion of CO is well
known for a longer period. However, this material has also drawn some research interest as a p-type
metal oxide gas sensor. A powerful strategy to improve both catalytic and 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 material is enabled.
The nanocrystalline Co3O4 powder was synthesised by the nitrate-glycine combustion route. The
glycine/metal ion ratio was adjusted to provide stoichiometric or fuel-lean conditions of the redox
reaction. The auto-ignition of gels with the evolution of large amounts of gases was occurred at
approximately 180 °C, and the process was spontaneously underwent to a smouldering combustion
and formation of a voluminous powder. According to the X-ray diffraction analysis the phase-pure
Co3O4 was obtained only when the precursor powder was prepared from the 50% 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 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,
and fired at 400 °C in air. The catalytic conversion of the Co3O4 powder and the sensor signal of the
corresponding sensors were checked under different concentrations of the reducing test gases. The
excellent catalytic activity of the Co3O4 powder was confirmed. The sensor signal was the best to
ethanol at the operating temperature of 150 °C, which was found to be 100 °C lower than for comercial
SnO2 sensors.
PB  - In{titut za kovinske materiale in tehnologije, Ljubljana, Lepi pot 11, Ljubljana, Slovenija
C3  - 22nd INTERNATIONAL CONFERENCE ON MATERIALS AND TECHNOLOGY
T1  - CATALYTIC AND SENSOR PROPERTIES OF Co3O4 PREPARED BY COMBUSTION SYNTHESIS ROUTE
EP  - 246
SP  - 246
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2909
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, has shown great potentials for various practical applications due to excellent
electronic, magnetic and redox properties. Its high catalytic activity in combustion of CO is well
known for a longer period. However, this material has also drawn some research interest as a p-type
metal oxide gas sensor. A powerful strategy to improve both catalytic and 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 material is enabled.
The nanocrystalline Co3O4 powder was synthesised by the nitrate-glycine combustion route. The
glycine/metal ion ratio was adjusted to provide stoichiometric or fuel-lean conditions of the redox
reaction. The auto-ignition of gels with the evolution of large amounts of gases was occurred at
approximately 180 °C, and the process was spontaneously underwent to a smouldering combustion
and formation of a voluminous powder. According to the X-ray diffraction analysis the phase-pure
Co3O4 was obtained only when the precursor powder was prepared from the 50% 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 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,
and fired at 400 °C in air. The catalytic conversion of the Co3O4 powder and the sensor signal of the
corresponding sensors were checked under different concentrations of the reducing test gases. The
excellent catalytic activity of the Co3O4 powder was confirmed. The sensor signal was the best to
ethanol at the operating temperature of 150 °C, which was found to be 100 °C lower than for comercial
SnO2 sensors.",
publisher = "In{titut za kovinske materiale in tehnologije, Ljubljana, Lepi pot 11, Ljubljana, Slovenija",
journal = "22nd INTERNATIONAL CONFERENCE ON MATERIALS AND TECHNOLOGY",
title = "CATALYTIC AND SENSOR PROPERTIES OF Co3O4 PREPARED BY COMBUSTION SYNTHESIS ROUTE",
pages = "246-246",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2909"
}

Vojisavljević, K., Wicker, S., Barsan, N., Kmet, B., Drnovšek, S.,& Malič, B.. (2014). CATALYTIC AND SENSOR PROPERTIES OF Co3O4 PREPARED BY COMBUSTION SYNTHESIS ROUTE. in 22nd INTERNATIONAL CONFERENCE ON MATERIALS AND TECHNOLOGY
In{titut za kovinske materiale in tehnologije, Ljubljana, Lepi pot 11, Ljubljana, Slovenija., 246-246.
https://hdl.handle.net/21.15107/rcub_rimsi_2909

Vojisavljević K, Wicker S, Barsan N, Kmet B, Drnovšek S, Malič B. CATALYTIC AND SENSOR PROPERTIES OF Co3O4 PREPARED BY COMBUSTION SYNTHESIS ROUTE. in 22nd INTERNATIONAL CONFERENCE ON MATERIALS AND TECHNOLOGY. 2014;:246-246.
https://hdl.handle.net/21.15107/rcub_rimsi_2909 .

Vojisavljević, Katarina, Wicker, Susanne, Barsan, Nicolae, Kmet, Brigita, Drnovšek, Silvo, Malič, Barbara, "CATALYTIC AND SENSOR PROPERTIES OF Co3O4 PREPARED BY COMBUSTION SYNTHESIS ROUTE" in 22nd INTERNATIONAL CONFERENCE ON MATERIALS AND TECHNOLOGY (2014):246-246,
https://hdl.handle.net/21.15107/rcub_rimsi_2909 .