Author, as appears in the article.: Roso, Sergio; Bittencourt, Carla; Umek, Polona; Gonzalez, Oriol; Guell, Frank; Urakawa, Atsushi; Llobet, Eduard
Department: Enginyeria Electrònica, Elèctrica i Automàtica
URV's Author/s: Llobet Valero, Eduard
Keywords: Vapor-phase transport method Temperature Synthesis (chemical) Single-crystalline Selective detection Resulting materials Precious metals Palladium Orders of magnitude Operating temperature Nitrogen oxides Metal nanoparticles Gas sensing properties Gas sensing electrodes Crystalline materials Ambient conditions
Abstract: Single crystalline indium oxide (In2O3) octahedra have been synthesized by means of a vapor phase transport method at high temperature. The resulting material has been characterized by FE-SEM, HR-TEM, XRD, XPS and PL. The gas sensing properties of this material against oxidizing and reducing gases have been examined and the conditions for selectively detecting such gases have been established. A high response towards NO2 has been obtained at a relatively low optimal operating temperature (i.e., 130 °C) and even at room temperature. The fact that the response of the nanomaterial is more than two orders of magnitude higher for NO2 than for H2, even in the presence of ambient moisture, makes it very promising for the selective detection of oxidizing species (at ppb levels) under real ambient conditions. The addition of noble metal nanoparticles (Pt and Pd) combined with an increase in the operating temperature (i.e., 250 °C) significantly increases H2 sensitivity and dramatically decreases the response to NO2. However, in this case, the presence of humidity negatively affects the response to H2. The sensing mechanisms are introduced and discussed. © The Royal Society of Chemistry 2016.
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/
Author's mail: eduard.llobet@urv.cat
Author identifier: 0000-0001-6164-4342
Record's date: 2024-10-12
Papper version: info:eu-repo/semantics/publishedVersion
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Journal Of Materials Chemistry c. 4 (40): 9418-9427
APA: Roso, Sergio; Bittencourt, Carla; Umek, Polona; Gonzalez, Oriol; Guell, Frank; Urakawa, Atsushi; Llobet, Eduard (2016). Synthesis of single crystalline In2O3 octahedra for the selective detection of NO2 and H2 at trace levels. Journal Of Materials Chemistry c, 4(40), 9418-9427. DOI: 10.1039/C6TC03218D
Entity: Universitat Rovira i Virgili
Journal publication year: 2016
Publication Type: Journal Publications
Repositori URV