title: Aerosol-Assisted CVD-Grown PdO Nanoparticle-Decorated Tungsten Oxide Nanoneedles Extremely Sensitive and Selective to Hydrogen.
abstract: We report for the first time the successful synthesis of palladium (Pd) nanoparticle (NP)-decorated tungsten trioxide (WO3) nanoneedles (NNs) via a two-step aerosol-assisted chemical vapor deposition approach. Morphological, structural, and elemental composition analysis revealed that a Pd(acac)2 precursor was very suitable to decorate WO3 NNs with uniform and well-dispersed PdO NPs. Gas-sensing results revealed that decoration with PdO NPs led to an ultrasensitive and selective hydrogen (H2) gas sensor (sensor response peaks at 1670 at 500 ppm of H2) with low operating temperature (150 °C). The response of decorated NNs is 755 times higher than that of bare WO3 NNs. Additionally, at a temperature near that of the ambient temperature (50 °C), the response of this sensor toward the same concentration of H2 was 23, which is higher than that of some promising sensors reported in the literature. Finally, humidity measurements showed that PdO/WO3 sensors displayed low-cross-sensitivity toward water vapor, compared to bare WO3 sensors. The addition of PdO NPs helps to minimize the effect of ambient humidity on the sensor response.
authors.affiliation: MINOS-EMaS, Universitat Rovira i Virgili , Avenida Països Catalans 26, 43007 Tarragona, Spain.
authors.forename: Fatima E
authors.initials: FE
authors.lastname: Annanouch
authors.affiliation: MINOS-EMaS, Universitat Rovira i Virgili , Avenida Països Catalans 26, 43007 Tarragona, Spain.|Laboratoire des Sciences de l'Information et des Systèmes (LSIS), Aix-Marseille University , 13284 Marseille, France.
authors.forename: Z
authors.initials: Z
authors.lastname: Haddi
authors.affiliation: Department of Chemistry, University College London , 20 Gordon Street, London WC1H 0AJ, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Ling
authors.affiliation: Department of Chemistry, University College London , 20 Gordon Street, London WC1H 0AJ, United Kingdom.
authors.forename: F
authors.initials: F
authors.lastname: Di Maggio
authors.affiliation: SIX Research Centre, Brno University of Technology , Technická 10, Brno CZ-61600, Czech Republic.
authors.forename: S
authors.initials: S
authors.lastname: Vallejos
authors.affiliation: MINOS-EMaS, Universitat Rovira i Virgili , Avenida Països Catalans 26, 43007 Tarragona, Spain.
authors.forename: T
authors.initials: T
authors.lastname: Vilic
authors.affiliation: Department of Chemistry, University College London , 20 Gordon Street, London WC1H 0AJ, United Kingdom.
authors.forename: Y
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: Department of Chemistry, University College London , 20 Gordon Street, London WC1H 0AJ, United Kingdom.|GC University , Katchery Road, Lahore 54000, Pakistan.
authors.forename: T
authors.initials: T
authors.lastname: Shujah
authors.affiliation: Department of Solid-State Physics, Jožef Stefan Institute , Jamova cesta 39, 1000 Ljubljana, Slovenia.
authors.forename: P
authors.initials: P
authors.lastname: Umek
authors.affiliation: Materia Nova, Univeristé de Mons , Parc Initialis, Avenue N. Copernic, 1, B-7000 Mons, Belgium.
authors.forename: C
authors.initials: C
authors.lastname: Bittencourt
authors.affiliation: Department of Chemistry, University College London , 20 Gordon Street, London WC1H 0AJ, United Kingdom.
authors.forename: C
authors.initials: C
authors.lastname: Blackman
authors.affiliation: MINOS-EMaS, Universitat Rovira i Virgili , Avenida Països Catalans 26, 43007 Tarragona, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Llobet
keywords: aerosol-assisted CVD; gas sensor; nanoneedles; nanoparticles