Sensitive detection of hydrocarbon gases using electrochemically Pd-modified ZnO chemiresistors

Elena Dilonardo, Michele Penza, Marco Alvisi, Gennaro Cassano, Cinzia Di Franco, Francesco Palmisano, Luisa Torsi, Nicola Cioffi

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5 Citations (Scopus)

Abstract

Pristine and electrochemically Pd-modified ZnO nanorods (ZnO NRs) were proposed as active sensing layers in chemiresistive gas sensors for hydrocarbon (HC) gas detection (e.g., CH4, C3H8, C4H10). The presence of Pd nanoparticles (NPs) on the surface of ZnO NRs, obtained after the thermal treatment at 550 �C, was revealed by morphological and surface chemical analyses, using scanning electron microscopy and X-ray photoelectron spectroscopy, respectively. The effect of the Pd catalyst on the performance of the ZnO-based gas sensor was evaluated by comparing the sensing results with those of pristine ZnO NRs, at an operating temperature of 300 �C and for various HC gas concentrations in the range of 30-1000 ppm. The Pd-modified ZnO NRs showed a higher selectivity and sensitivity compared to pristine ZnO NRs. The mean sensitivity of Pd-modified ZnO NRs towards the analyzed HCs gases increased with the length of the hydrocarbon chain of the target gas molecule. Finally, the evaluation of the selectivity revealed that the presence or the absence of metal nanoparticles on ZnO NRs improves the selectivity in the detection of specific HCs gaseous molecules.
Original languageEnglish
Pages (from-to)82 - 90
Number of pages9
JournalBeilstein Journal of Nanotechnology
Volume8
Issue number1
DOIs
Publication statusPublished - 2017
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy(all)
  • Electrical and Electronic Engineering

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