NH<sub>3</sub> Sensor Based on ZIF-8/CNT Operating at Room Temperature with Immunity to Humidity
Humidity effects on resistive gas sensors operating at room temperature remain a serious bottleneck. In this work, we introduce a resistive gas sensor based on a zeolitic imidazolate framework-8/carbon nanotube (ZIF-8/CNT) composite for the detection of ammonia gas at room temperature. The composite...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-10-01
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| Series: | Inorganics |
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| Online Access: | https://www.mdpi.com/2304-6740/10/11/193 |
| _version_ | 1797467852776669184 |
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| author | Wenjun Yan Shiyu Zhou Min Ling XinSheng Peng Houpan Zhou |
| author_facet | Wenjun Yan Shiyu Zhou Min Ling XinSheng Peng Houpan Zhou |
| author_sort | Wenjun Yan |
| collection | DOAJ |
| description | Humidity effects on resistive gas sensors operating at room temperature remain a serious bottleneck. In this work, we introduce a resistive gas sensor based on a zeolitic imidazolate framework-8/carbon nanotube (ZIF-8/CNT) composite for the detection of ammonia gas at room temperature. The composite was prepared using a facile solution method. In this sensor, the basic mechanism was the charge transfer between ammonia molecules and CNTs; meanwhile, the ZIF-8 facilitated the adsorption of ammonia molecules as a preconcentrator, and prevented the adsorption of H<sub>2</sub>O molecules due to its hydrophobicity; CNTs were threaded through the ZIF-8 to form a great conductive network for charge transfer. The obtained sensor showed good ammonia sensing, especially at room temperature, with great selectivity and immunity to humidity under moderately humid conditions (45–70 % RH). However, the ammonia response was reduced at very high humidity (90% RH) due to the competitive adsorption of H<sub>2</sub>O molecules. This proved that the NH<sub>3</sub> sensor based on ZIF-8/CNT could be suitable for practical applications under moderately humid conditions. |
| first_indexed | 2024-03-09T18:58:38Z |
| format | Article |
| id | doaj.art-69e00a4ac18e43a096c77019503a3563 |
| institution | Directory Open Access Journal |
| issn | 2304-6740 |
| language | English |
| last_indexed | 2024-03-09T18:58:38Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Inorganics |
| spelling | doaj.art-69e00a4ac18e43a096c77019503a35632023-11-24T05:12:35ZengMDPI AGInorganics2304-67402022-10-01101119310.3390/inorganics10110193NH<sub>3</sub> Sensor Based on ZIF-8/CNT Operating at Room Temperature with Immunity to HumidityWenjun Yan0Shiyu Zhou1Min Ling2XinSheng Peng3Houpan Zhou4School of Automation, Hangzhou Dianzi University, Hangzhou 310018, ChinaProvincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, ChinaProvincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, ChinaProvincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, ChinaSchool of Automation, Hangzhou Dianzi University, Hangzhou 310018, ChinaHumidity effects on resistive gas sensors operating at room temperature remain a serious bottleneck. In this work, we introduce a resistive gas sensor based on a zeolitic imidazolate framework-8/carbon nanotube (ZIF-8/CNT) composite for the detection of ammonia gas at room temperature. The composite was prepared using a facile solution method. In this sensor, the basic mechanism was the charge transfer between ammonia molecules and CNTs; meanwhile, the ZIF-8 facilitated the adsorption of ammonia molecules as a preconcentrator, and prevented the adsorption of H<sub>2</sub>O molecules due to its hydrophobicity; CNTs were threaded through the ZIF-8 to form a great conductive network for charge transfer. The obtained sensor showed good ammonia sensing, especially at room temperature, with great selectivity and immunity to humidity under moderately humid conditions (45–70 % RH). However, the ammonia response was reduced at very high humidity (90% RH) due to the competitive adsorption of H<sub>2</sub>O molecules. This proved that the NH<sub>3</sub> sensor based on ZIF-8/CNT could be suitable for practical applications under moderately humid conditions.https://www.mdpi.com/2304-6740/10/11/193NH<sub>3</sub> sensorZIF-8/CNTroom temperatureimmunity to humidityhydrophobic |
| spellingShingle | Wenjun Yan Shiyu Zhou Min Ling XinSheng Peng Houpan Zhou NH<sub>3</sub> Sensor Based on ZIF-8/CNT Operating at Room Temperature with Immunity to Humidity Inorganics NH<sub>3</sub> sensor ZIF-8/CNT room temperature immunity to humidity hydrophobic |
| title | NH<sub>3</sub> Sensor Based on ZIF-8/CNT Operating at Room Temperature with Immunity to Humidity |
| title_full | NH<sub>3</sub> Sensor Based on ZIF-8/CNT Operating at Room Temperature with Immunity to Humidity |
| title_fullStr | NH<sub>3</sub> Sensor Based on ZIF-8/CNT Operating at Room Temperature with Immunity to Humidity |
| title_full_unstemmed | NH<sub>3</sub> Sensor Based on ZIF-8/CNT Operating at Room Temperature with Immunity to Humidity |
| title_short | NH<sub>3</sub> Sensor Based on ZIF-8/CNT Operating at Room Temperature with Immunity to Humidity |
| title_sort | nh sub 3 sub sensor based on zif 8 cnt operating at room temperature with immunity to humidity |
| topic | NH<sub>3</sub> sensor ZIF-8/CNT room temperature immunity to humidity hydrophobic |
| url | https://www.mdpi.com/2304-6740/10/11/193 |
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