Nanocrystalline Oxides Ni<sub><i>x</i></sub>Co<sub>3−<i>x</i></sub>O<sub>4</sub>: Sub-ppm H<sub>2</sub>S Sensing and Humidity Effect
In this work, <i>p</i>-type oxide semiconductors, Co<sub>3</sub>O<sub>4</sub> and complex oxides Ni<sub><i>x</i></sub>Co<sub>3−<i>x</i></sub>O<sub>4</sub> (<i>x</i> = 0.04, 0.07, 0.1), were st...
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MDPI AG
2021-02-01
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| Series: | Chemosensors |
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| Online Access: | https://www.mdpi.com/2227-9040/9/2/34 |
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| author | Kseniya Prikhodko Abulkosim Nasriddinov Svetlana Vladimirova Marina Rumyantseva Alexander Gaskov |
| author_facet | Kseniya Prikhodko Abulkosim Nasriddinov Svetlana Vladimirova Marina Rumyantseva Alexander Gaskov |
| author_sort | Kseniya Prikhodko |
| collection | DOAJ |
| description | In this work, <i>p</i>-type oxide semiconductors, Co<sub>3</sub>O<sub>4</sub> and complex oxides Ni<sub><i>x</i></sub>Co<sub>3−<i>x</i></sub>O<sub>4</sub> (<i>x</i> = 0.04, 0.07, 0.1), were studied as materials for sub-ppm H<sub>2</sub>S sensing in the temperature range of 90–300 °C in dry and humid air. Nanocrystalline Co<sub>3</sub>O<sub>4</sub> and Ni<sub><i>x</i></sub>Co<sub>3−<i>x</i></sub>O<sub>4</sub> (<i>x</i> = 0.04, 0.07, 0.1) were prepared by coprecipitation of cobalt and nickel oxalates from nitrate solutions and further annealing at 300 °C. The surface reactivity of the obtained materials toward H<sub>2</sub>S both in dry and humid atmosphere (relative humidity at 25 °C R.H. = 60%) was investigated using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). Sensor measurements showed a decrease in sensor signal toward 1 ppm H<sub>2</sub>S with an increase in Ni content because of a decrease in chemisorbed surface oxygen species. On the other hand, sensor signal increases for all samples with increasing the relative humidity that depends on reactivity of the surface hydroxyl groups, which stimulate the decomposition of surface sulfites and provide better surface regeneration at higher temperature. This assumption was additionally confirmed by the faster saturation of the conductivity curve and a decrease in the sensor response time in humid air. |
| first_indexed | 2024-03-09T05:15:58Z |
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| institution | Directory Open Access Journal |
| issn | 2227-9040 |
| language | English |
| last_indexed | 2024-03-09T05:15:58Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Chemosensors |
| spelling | doaj.art-6bb7a8babf9143a2a9fcb3a6d26aff122023-12-03T12:45:24ZengMDPI AGChemosensors2227-90402021-02-01923410.3390/chemosensors9020034Nanocrystalline Oxides Ni<sub><i>x</i></sub>Co<sub>3−<i>x</i></sub>O<sub>4</sub>: Sub-ppm H<sub>2</sub>S Sensing and Humidity EffectKseniya Prikhodko0Abulkosim Nasriddinov1Svetlana Vladimirova2Marina Rumyantseva3Alexander Gaskov4Chemistry Department, Moscow State University, 119991 Moscow, RussiaChemistry Department, Moscow State University, 119991 Moscow, RussiaChemistry Department, Moscow State University, 119991 Moscow, RussiaChemistry Department, Moscow State University, 119991 Moscow, RussiaChemistry Department, Moscow State University, 119991 Moscow, RussiaIn this work, <i>p</i>-type oxide semiconductors, Co<sub>3</sub>O<sub>4</sub> and complex oxides Ni<sub><i>x</i></sub>Co<sub>3−<i>x</i></sub>O<sub>4</sub> (<i>x</i> = 0.04, 0.07, 0.1), were studied as materials for sub-ppm H<sub>2</sub>S sensing in the temperature range of 90–300 °C in dry and humid air. Nanocrystalline Co<sub>3</sub>O<sub>4</sub> and Ni<sub><i>x</i></sub>Co<sub>3−<i>x</i></sub>O<sub>4</sub> (<i>x</i> = 0.04, 0.07, 0.1) were prepared by coprecipitation of cobalt and nickel oxalates from nitrate solutions and further annealing at 300 °C. The surface reactivity of the obtained materials toward H<sub>2</sub>S both in dry and humid atmosphere (relative humidity at 25 °C R.H. = 60%) was investigated using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). Sensor measurements showed a decrease in sensor signal toward 1 ppm H<sub>2</sub>S with an increase in Ni content because of a decrease in chemisorbed surface oxygen species. On the other hand, sensor signal increases for all samples with increasing the relative humidity that depends on reactivity of the surface hydroxyl groups, which stimulate the decomposition of surface sulfites and provide better surface regeneration at higher temperature. This assumption was additionally confirmed by the faster saturation of the conductivity curve and a decrease in the sensor response time in humid air.https://www.mdpi.com/2227-9040/9/2/34cobalt oxide Co<sub>3</sub>O<sub>4</sub>complex oxides Ni<sub><i>x</i></sub>Co<sub>3−<i>x</i></sub>O<sub>4</sub>hydrogen sulfide H<sub>2</sub>Ssemiconductor gas sensorhumidity effectDRIFTS investigation |
| spellingShingle | Kseniya Prikhodko Abulkosim Nasriddinov Svetlana Vladimirova Marina Rumyantseva Alexander Gaskov Nanocrystalline Oxides Ni<sub><i>x</i></sub>Co<sub>3−<i>x</i></sub>O<sub>4</sub>: Sub-ppm H<sub>2</sub>S Sensing and Humidity Effect Chemosensors cobalt oxide Co<sub>3</sub>O<sub>4</sub> complex oxides Ni<sub><i>x</i></sub>Co<sub>3−<i>x</i></sub>O<sub>4</sub> hydrogen sulfide H<sub>2</sub>S semiconductor gas sensor humidity effect DRIFTS investigation |
| title | Nanocrystalline Oxides Ni<sub><i>x</i></sub>Co<sub>3−<i>x</i></sub>O<sub>4</sub>: Sub-ppm H<sub>2</sub>S Sensing and Humidity Effect |
| title_full | Nanocrystalline Oxides Ni<sub><i>x</i></sub>Co<sub>3−<i>x</i></sub>O<sub>4</sub>: Sub-ppm H<sub>2</sub>S Sensing and Humidity Effect |
| title_fullStr | Nanocrystalline Oxides Ni<sub><i>x</i></sub>Co<sub>3−<i>x</i></sub>O<sub>4</sub>: Sub-ppm H<sub>2</sub>S Sensing and Humidity Effect |
| title_full_unstemmed | Nanocrystalline Oxides Ni<sub><i>x</i></sub>Co<sub>3−<i>x</i></sub>O<sub>4</sub>: Sub-ppm H<sub>2</sub>S Sensing and Humidity Effect |
| title_short | Nanocrystalline Oxides Ni<sub><i>x</i></sub>Co<sub>3−<i>x</i></sub>O<sub>4</sub>: Sub-ppm H<sub>2</sub>S Sensing and Humidity Effect |
| title_sort | nanocrystalline oxides ni sub i x i sub co sub 3 i x i sub o sub 4 sub sub ppm h sub 2 sub s sensing and humidity effect |
| topic | cobalt oxide Co<sub>3</sub>O<sub>4</sub> complex oxides Ni<sub><i>x</i></sub>Co<sub>3−<i>x</i></sub>O<sub>4</sub> hydrogen sulfide H<sub>2</sub>S semiconductor gas sensor humidity effect DRIFTS investigation |
| url | https://www.mdpi.com/2227-9040/9/2/34 |
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