In depth study on the notable room-temperature NO^sub 2^ gas sensor based on CuO nanoplatelets prepared by sonochemical method: Comparison of various bases

The strategy for the synthesis of metal oxide nanostructured based sensors that operate at room temperature with higher sensitivity and selectivity facilitates the forecasts towards low cost and power consumption gas sensors which will be beneficial to domestic and industrial applications. As a resu...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2018-08, Vol.266, p.761
Main Authors: Oosthuizen, DN, Motaung, DE, Swart, HC
Format: Article
Language:English
Subjects:
Additives
Chemical compounds
Chemical synthesis
Copper
Copper oxides
Crystal defects
Gas detectors
Gas sensors
Industrial applications
Metal oxides
Nanostructure
Nanostructured materials
Nitrogen dioxide
Point defects
Power consumption
Room temperature
Selectivity
Sensitivity
Sodium hydroxide
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Summary:The strategy for the synthesis of metal oxide nanostructured based sensors that operate at room temperature with higher sensitivity and selectivity facilitates the forecasts towards low cost and power consumption gas sensors which will be beneficial to domestic and industrial applications. As a result, herein, we report on the improved room temperature NO2 gas sensing based on CuO nanostructures grown using the sonochemical method in various aqueous solutions. A transformation of the copper nitrate solution under basic aqueous conditions into CuO nanoplatelets and flower-like nanostructures, without the assistance of any surfactants and additives was observed. Structural analyses revealed a size–dependent broadening due to the decrease in platelet size as the reaction temperature was increased. A high sensitivity of 173 ppm−1 and selectivity to NO2 gas at room-temperature has been realized when using NaOH as a base. The higher sensing properties were due to longer synthesis reaction temperature (75 °C), resulting to small crystallite size, higher Brunauer-Emmett-Teller surface area and point defects.
ISSN:0925-4005
1873-3077