Author, as appears in the article.: Navarrete E; Bittencourt C; Umek P; Llobet E

Department: Enginyeria Electrònica, Elèctrica i Automàtica

URV's Author/s: Llobet Valero, Eduard / Navarrete Gatell, Èric

Keywords: Thin-films Temperature Sensors Sensitivity Performance P-type Level Aerosol-assisted cvd

Abstract: © 2018 The Royal Society of Chemistry. Here, we show that the aerosol assisted chemical vapor deposition process is suitable for growing single crystalline tungsten oxide nanowires loaded with nickel oxide nanoparticles. This method allows achieving of a wide range of nickel oxide loadings on tungsten oxide nanowires with high effectivity. It also allows for the direct growth of these nanomaterials onto application substrates for developing resistive metal oxide gas sensors. Different morphological and compositional analysis tools have been employed for the characterization of the nanomaterials, finding that nickel oxide nanoparticles are homogeneously distributed over the tungsten oxide nanowire surface. However, at high Ni loadings, even though the size of the nanoparticles remains unchanged, they form agglomerates, especially at the tips of tungsten nanowires. The gas sensing properties of the different nanomaterials grown towards methane, ethanol, nitrogen dioxide and hydrogen sulfide have been studied. The optimized loading of tungsten oxide with nickel oxide nanoparticles has a positive effect on increasing the sensitivity and selectivity of the resulting nanomaterial to hydrogen sulfide, reaching a five-fold increase in the response towards this species. This improvement is attributed to combined chemical and electronic sensitization effects. Therefore, these nanomaterials show good potential for developing inexpensive resistive sensors able to monitor the presence of hydrogen sulfide in the environment.

Thematic Areas: Química Physics, applied Odontología Materials science, multidisciplinary Materials chemistry Materiais Interdisciplinar General chemistry Engenharias iii Ciências ambientais Ciências agrárias i Chemistry (miscellaneous) Chemistry (all) Biotecnología Astronomia / física

licence for use: https://creativecommons.org/licenses/by/3.0/es/

ISSN: 20507526

Author's mail: eric.navarrete@urv.cat eduard.llobet@urv.cat eric.navarrete@urv.cat

Author identifier: 0000-0001-6164-4342

Record's date: 2023-02-19

Papper version: info:eu-repo/semantics/submittedVersion

Link to the original source: https://pubs.rsc.org/en/content/articlelanding/2018/tc/c8tc00571k

Licence document URL: http://repositori.urv.cat/ca/proteccio-de-dades/

Papper original source: Journal Of Materials Chemistry c. 6 (19): 5181-5192

APA: Navarrete E; Bittencourt C; Umek P; Llobet E (2018). AACVD and gas sensing properties of nickel oxide nanoparticle decorated tungsten oxide nanowires. Journal Of Materials Chemistry c, 6(19), 5181-5192. DOI: 10.1039/c8tc00571k

Article's DOI: 10.1039/c8tc00571k

Entity: Universitat Rovira i Virgili

Journal publication year: 2018

Publication Type: Journal Publications