CO2 sensing properties of electro-spun Ca-doped ZnO fibres

The availability of low-cost, high-performing sensors for carbon dioxide detection in the environment may play a crucial role for reducing CO2 emissions and limiting global warming. In this study, calcium-doped zinc oxide nanofibres with different Ca to Zn loading ratios (1:40 or 1:20) are synthesis...

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Bibliographic Details
Published in:Nanotechnology 2018-07, Vol.29 (30), p.305501-305501
Main Authors: Pantò, Fabiola, Leonardi, Salvatore Gianluca, Fazio, Enza, Frontera, Patrizia, Bonavita, Anna, Neri, Giovanni, Antonucci, Pierluigi, Neri, Fortunato, Santangelo, Saveria
Format: Article
Language:English
Subjects:
Ca-doped ZnO fibres
carbon dioxide
electro-spinning
gas sensor
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Summary:The availability of low-cost, high-performing sensors for carbon dioxide detection in the environment may play a crucial role for reducing CO2 emissions and limiting global warming. In this study, calcium-doped zinc oxide nanofibres with different Ca to Zn loading ratios (1:40 or 1:20) are synthesised via electro-spinning, thoroughly characterised and, for the first time, tested as an active material for the detection of carbon dioxide. The results of their characterisation show that the highly porous fibres consist of interconnected grains of oxide with the hexagonal wurtzite structure of zincite. Depending on the Ca:Zn loading ratio, calcium fully or partly segregates to form calcite on the fibre surface. The high response of the sensor based on the fibres with the highest Ca-doping level can be attributed to the synergy between the fibre morphology and the basicity of Ca-ion sites, which favour the diffusion of the gas molecules within the sensing layer and the CO2 adsorption, respectively.
ISSN:0957-4484
1361-6528
DOI:10.1088/1361-6528/aac27c