Mechanism of O3 sensing on Cu2O(111) surface: First principle calculations

Ouali, Hela; Lambert-Mauriat, C.; Raymond, L.; Labidi, A.

doi:10.1016/j.apsusc.2015.06.017

Cited by 7 publications

(8 citation statements)

References 29 publications

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“…Concurrently the Fermi level of the system moves inside its valence band consistent with p-type doping. These results are in agreement with the findings reported by Ouali et al 17 …”

Section: Resultssupporting

confidence: 94%

“…25 C), compared with previous studies in which a T work of 175 C was employed. 17 More specically, this is the rst report on the use of Cu 2 O nanocubes as a self-powered sensing element for the detection of ultra-low O 3 concentrations down to 10 ppb with the highest response value of 28% and a response/recovery time of 30/18 s, respectively, at room temperature.…”

Section: Resultsmentioning

confidence: 93%

“…4,6,[9][10][11][12][13] Considering the detection of O 3, the majority of studies are related to composites with other metals such as CuAlO 2 and CuCrO 2 tested against a variety of gas concentrations and at different working temperatures. To the best of our knowledge, Ouali et al were the only report on the use of Cu 2 O for 10 to 1000 ppb level sensing of O 3 at an operating temperature of 175 C. 17 Moreover, Zhou et al synthesized both nanocrystals (10-80 nm) and thin lms of CuCrO 2 for the detection of 50-200 ppm O 3 at room temperature (25 C), with the maximum response (6%) measured at 200 ppm. 18 Deng et al prepared CuCrO 2 thin lms for the detection of 100 ppb O 3 at room temperature, using air for the recovery of the system.…”

Section: Introductionmentioning

confidence: 97%

“…[12][13][14][15] In the eld of gassensing, Cu 2 O has great potential in detecting various pollutants in their gaseous form, due to its signicant surface reactivity with both reducing (ethanol, gasoline, CO, and H 2 S) 3,5,7,8,16 and oxidizing gases (NO 2 , CO 2 , CH 4 , and O 3 ). 4,6,7,9,10,17,18 However, the working temperature of the sensors fabricated using Cu 2 O is signicantly higher than room temperature (25 C). 4,6,[9][10][11][12][13] Considering the detection of O 3, the majority of studies are related to composites with other metals such as CuAlO 2 and CuCrO 2 tested against a variety of gas concentrations and at different working temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…To the best of our knowledge, Ouali et al were the only report on the use of Cu 2 O for 10 to 1000 ppb level sensing of O 3 at an operating temperature of 175 °C. 17 Moreover, Zhou et al synthesized both nanocrystals (10–80 nm) and thin films of CuCrO 2 for the detection of 50–200 ppm O 3 at room temperature (25 °C), with the maximum response (6%) measured at 200 ppm. 18 Deng et al prepared CuCrO 2 thin films for the detection of 100 ppb O 3 at room temperature, using air for the recovery of the system.…”

Section: Introductionmentioning

confidence: 99%

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Highly sensitive and room temperature detection of ultra-low concentrations of O₃ using self-powered sensing elements of Cu₂O nanocubes

et al. 2019

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The fundamental development of the design of novel self-powered ozone sensing elements, operating at room temperature, based on p-type metal oxides paves the way to a new class of low cost, highly promising gas sensing devices. In this work, p-type Cu 2 O nanocubes were synthesized by a simple solution-based method and tested as a self-powered ozone sensing element, at room temperature (25 C) for the first time. Highly crystalline Cu 2 O nanocubes with 30 nm size were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). Self-powered sensing elements of Cu 2 O nanocubes have been successfully fabricated by deposition of Cu 2 O nanocubes on interdigitated electrodes (IDEs) consisting of two connection tracks with 500 digits and a gap of 5 mm in order to investigate their response to ozone at room temperature. The experimental results showed that the use of nanocubes as sensing elements was suitable for detecting ultra-low concentrations of O 3 down to 10 ppb at room temperature with very high sensitivity (28%) and a very low response/recovery time. The reversible sensing process of the relatively weak binding of O 3 species by trapping sites on Cu 2 O facets with increased oxygen content was studied by using density functional theory (DFT) calculations. Fig. 4 Current changes at room temperature of Cu 2 O nanocubes due to successive increases in O 3 concentrations.

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“…Concurrently the Fermi level of the system moves inside its valence band consistent with p-type doping. These results are in agreement with the findings reported by Ouali et al 17 …”

Section: Resultssupporting

confidence: 94%

Section: Resultsmentioning

confidence: 93%