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Enhanced gas sensing properties of chemiresistors based on ZnO nanorods electrodecorated with Au and Pd nanoparticles

Published online by Cambridge University Press:  12 January 2017

E. Dilonardo ,
M. Alvisi ,
G. Cassano  and
M. Penza
E. Dilonardo*
Affiliation:
Department of Chemistry, Università degli Studi di Bari Aldo Moro, Bari, Italy. Department of Electrotechnics and Electronics (DEE), Politecnico di Bari, Bari, Italy.
M. Alvisi
Affiliation:
ENEA, - Brindisi Research Center, Brindisi, Italy
G. Cassano
Affiliation:
ENEA, - Brindisi Research Center, Brindisi, Italy
M. Penza
Affiliation:
ENEA, - Brindisi Research Center, Brindisi, Italy
*
*Corresponding authors: Elena Dilonardo ([email protected]).
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Abstract

Colloidal Au and Pd nanoparticles (NPs) were directly electrochemically synthesized, by sacrificial anode electrolysis (SAE), on hydrothermal ZnO nanostructures, previously desiccated; further, the functionalized ZnO nanostructures were subjected to thermal annealing at 550°C to obtain stable ZnO nanorods (NRs), superficially decorated by naked metal NPs. The both pristine and metal functionalized ZnO NRs were proposed as active layer in chemiresistive sensors for environmental monitoring to detect pollutant gases (e.g. NO2, C4H10).

The effect of the presence and of the chemical nature of the deposited metal NPs on the performance of ZnO NRs-based gas sensor (e.g. sensitivity, selectivity and recovery) was evaluated, comparing the sensing results with those of pristine ZnO NRs. In particular, the gas sensing properties of pristine and metal-functionalized ZnO NRs were studied at an operating temperature of 300°C towards a various range of concentration of different gaseous pollutants.

Keywords

electrochemical synthesiselectrodepositionsensor
Type
Articles
Information
MRS Advances , Volume 2 , Issue 18: Processing and Manufacturing , 2017 , pp. 1001 - 1007
Copyright
Copyright © Materials Research Society 2017 

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References

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