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

TitleSensitive detection of hydrocarbon gases using electrochemically Pd-modified ZnO chemiresistors
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2017
AuthorsCassano, Gennaro, Alvisi Marco, and Penza Michele
JournalBEILSTEIN JOURNAL OF NANOTECHNOLOGY
Volume8
Pagination82-90
ISSN21904286
KeywordsChemiresistive gas sensor, Electrosynthesis, Hydrocarbon gas sensor, Pd-modified ZnO, ZnO nanorods
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. © 2017 Dilonardo et al.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85010187369&doi=10.3762%2fbjnano.8.9&partnerID=40&md5=21b286ef04afd8f2a8e577ce3e7237fb
DOI10.3762/bjnano.8.9
Citation Key 20.500.12079_1689