Abstract

We report a facile and efficient method for the synthesis of novel concave Cu₂O octahedral nanostructure. The concave Cu₂O octahedral nanostructure has an average diameter of 400 nm. Moreover, the Cu₂O nanorods were also prepared by controlling the hydroxylamine hydrochloride (NH₂OH・HCl) concentrations. The concave Cu₂O octahedral nanostructures were evaluated as a sensing materials for benzene (C₆H₆) detection at operating temperature of 230 °C and the results reveal that it has excellent sensing dependence to C₆H₆ concentration changes. Interestingly, The concave Cu₂O octahedral nanostructure also has good sensing response to NO₂ at relatively low operating temperatures of 50 °C with high response of 4.3 and the response and recovery time shorter than 20 and 131 s to 20 ppm, respectively. The multifunctional concave Cu₂O octahedral nanostructures would be promising functional nanomaterials in sensor fields.

Keywords

• Cu₂O; 

• Concave octahedral; 

• C₆H₆ and NO₂ gas detection; 

• Sensor

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