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Nanotechnology. 2014 Sep 12;25(36):365502. doi: 10.1088/0957-4484/25/36/365502. Epub 2014 Aug 14.

Selective response inversion to NO₂ and acetic acid in ZnO and CdS nanocomposite gas sensor.

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IMEM-CNR, Parco Area delle Scienze 37/A, Parma-43124, Italy.


High sensitivity zinc oxide (ZnO) tetrapods (TPs) have been functionalized by nucleating cadmium sulphide (CdS) nanoparticles (NPs) directly on their surface with a spotted coverage thanks to an optimized synthesis in dimethylformamide (DMF). The obtained hybrid coupled material has been used to realize a gas sensing device with a highly porous nanostructured network, in which the proper alternation of ZnO-TPs and CdS-NPs gives rise to unconventional chemoresistive behaviours. Among the different tested gases and vapours, the sensor showed a unique fingerprint response-inversion between 300 °C and 400 °C only for nitrogen dioxide (NO2) and acetic acid (CH3COOH).

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