Sensing Properties of NiO Loaded SnO<sub>2</sub> Nanoparticles—Specific Selectivity to H<sub>2</sub>S
NiO-loaded SnO<sub>2</sub> powders were prepared involving two chemical procedures. The mesoporous SnO<sub>2</sub> support was synthesized by a hydrothermal route using Brij 35 non-ionic surfactant as a template. The nickel loadings of 1 and 10 wt.%. NiO were deposited by the...
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| Format: | Article |
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MDPI AG
2021-06-01
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| Series: | Chemosensors |
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| Online Access: | https://www.mdpi.com/2227-9040/9/6/125 |
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| author | Adelina Stanoiu Andrei C. Kuncser Daniela Ghica Ovidiu G. Florea Simona Somacescu Cristian E. Simion |
| author_facet | Adelina Stanoiu Andrei C. Kuncser Daniela Ghica Ovidiu G. Florea Simona Somacescu Cristian E. Simion |
| author_sort | Adelina Stanoiu |
| collection | DOAJ |
| description | NiO-loaded SnO<sub>2</sub> powders were prepared involving two chemical procedures. The mesoporous SnO<sub>2</sub> support was synthesized by a hydrothermal route using Brij 35 non-ionic surfactant as a template. The nickel loadings of 1 and 10 wt.%. NiO were deposited by the wet impregnation method. The H<sub>2</sub>S sensing properties of xNiO-(1-x)SnO<sub>2</sub> (x = 0, 1, 10%) thick layers deposited onto commercial substrates have been investigated with respect to different potential interfering gases (NO<sub>2</sub>, CO, CO<sub>2</sub>, CH<sub>4</sub>, NH<sub>3</sub> and SO<sub>2</sub>) over a wide range of operating temperatures and relative humidity specific for in-field conditions. Following the correlation of the sensing results with the morphological ones, 1wt.% NiO/SnO<sub>2</sub> was selected for simultaneous electrical resistance and work function investigations. The purpose was to depict the sensing mechanism by splitting between specific changes over the electron affinity induced by the surface coverage with hydroxyl dipoles and over the band bending induced by the variable surface charge under H<sub>2</sub>S exposure. Thus, it was found that different gas-interaction partners are dependent upon the amount of H<sub>2</sub>S, mirrored through the threshold value of 5 ppm H<sub>2</sub>S, which from an applicative point of view, represents the lower limit of health effects, an eight-hour TWA. |
| first_indexed | 2024-03-10T10:48:58Z |
| format | Article |
| id | doaj.art-90704e08d289401b9d861f87aafd5c84 |
| institution | Directory Open Access Journal |
| issn | 2227-9040 |
| language | English |
| last_indexed | 2024-03-10T10:48:58Z |
| publishDate | 2021-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Chemosensors |
| spelling | doaj.art-90704e08d289401b9d861f87aafd5c842023-11-21T22:24:44ZengMDPI AGChemosensors2227-90402021-06-019612510.3390/chemosensors9060125Sensing Properties of NiO Loaded SnO<sub>2</sub> Nanoparticles—Specific Selectivity to H<sub>2</sub>SAdelina Stanoiu0Andrei C. Kuncser1Daniela Ghica2Ovidiu G. Florea3Simona Somacescu4Cristian E. Simion5National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, RomaniaNational Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, RomaniaNational Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, RomaniaNational Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania“Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, Spl. Independentei 202, 060021 Bucharest, RomaniaNational Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, RomaniaNiO-loaded SnO<sub>2</sub> powders were prepared involving two chemical procedures. The mesoporous SnO<sub>2</sub> support was synthesized by a hydrothermal route using Brij 35 non-ionic surfactant as a template. The nickel loadings of 1 and 10 wt.%. NiO were deposited by the wet impregnation method. The H<sub>2</sub>S sensing properties of xNiO-(1-x)SnO<sub>2</sub> (x = 0, 1, 10%) thick layers deposited onto commercial substrates have been investigated with respect to different potential interfering gases (NO<sub>2</sub>, CO, CO<sub>2</sub>, CH<sub>4</sub>, NH<sub>3</sub> and SO<sub>2</sub>) over a wide range of operating temperatures and relative humidity specific for in-field conditions. Following the correlation of the sensing results with the morphological ones, 1wt.% NiO/SnO<sub>2</sub> was selected for simultaneous electrical resistance and work function investigations. The purpose was to depict the sensing mechanism by splitting between specific changes over the electron affinity induced by the surface coverage with hydroxyl dipoles and over the band bending induced by the variable surface charge under H<sub>2</sub>S exposure. Thus, it was found that different gas-interaction partners are dependent upon the amount of H<sub>2</sub>S, mirrored through the threshold value of 5 ppm H<sub>2</sub>S, which from an applicative point of view, represents the lower limit of health effects, an eight-hour TWA.https://www.mdpi.com/2227-9040/9/6/125NiO loaded SnO<sub>2</sub>thick filmselectrical resistancework functionH<sub>2</sub>S sensing mechanism |
| spellingShingle | Adelina Stanoiu Andrei C. Kuncser Daniela Ghica Ovidiu G. Florea Simona Somacescu Cristian E. Simion Sensing Properties of NiO Loaded SnO<sub>2</sub> Nanoparticles—Specific Selectivity to H<sub>2</sub>S Chemosensors NiO loaded SnO<sub>2</sub> thick films electrical resistance work function H<sub>2</sub>S sensing mechanism |
| title | Sensing Properties of NiO Loaded SnO<sub>2</sub> Nanoparticles—Specific Selectivity to H<sub>2</sub>S |
| title_full | Sensing Properties of NiO Loaded SnO<sub>2</sub> Nanoparticles—Specific Selectivity to H<sub>2</sub>S |
| title_fullStr | Sensing Properties of NiO Loaded SnO<sub>2</sub> Nanoparticles—Specific Selectivity to H<sub>2</sub>S |
| title_full_unstemmed | Sensing Properties of NiO Loaded SnO<sub>2</sub> Nanoparticles—Specific Selectivity to H<sub>2</sub>S |
| title_short | Sensing Properties of NiO Loaded SnO<sub>2</sub> Nanoparticles—Specific Selectivity to H<sub>2</sub>S |
| title_sort | sensing properties of nio loaded sno sub 2 sub nanoparticles specific selectivity to h sub 2 sub s |
| topic | NiO loaded SnO<sub>2</sub> thick films electrical resistance work function H<sub>2</sub>S sensing mechanism |
| url | https://www.mdpi.com/2227-9040/9/6/125 |
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