Humidity-Activated Ammonia Sensor Based on Carboxylic Functionalized Cross-Linked Hydrogel
Owing to its extensive use and intrinsic toxicity, NH<sub>3</sub> detection is very crucial. Moisture can cause significant interference in the performance of sensors, and detecting NH<sub>3</sub> in high humidity is still a challenge. In this work, a humidity-activated NH<...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
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| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/24/24/8154 |
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| Summary: | Owing to its extensive use and intrinsic toxicity, NH<sub>3</sub> detection is very crucial. Moisture can cause significant interference in the performance of sensors, and detecting NH<sub>3</sub> in high humidity is still a challenge. In this work, a humidity-activated NH<sub>3</sub> sensor was prepared by urocanic acid (URA) modifying poly (ethylene glycol) diacrylate (PEGDA) via a thiol-ene click cross-linking reaction. The optimized sensor achieved a response of 70% to 50 ppm NH<sub>3</sub> at 80% RH, with a response time of 105.6 s and a recovery time of 346.8 s. The sensor was improved for response and recovery speed. In addition, the prepared sensor showed excellent selectivity to NH<sub>3</sub> in high-humidity environments, making it suitable for use in some areas with high humidity all the year round or in high-humidity areas such as the detection of respiratory gas. A detailed investigation of the humidity-activated NH<sub>3</sub>-sensing mechanism was conducted using complex impedance plot (CIP) measurements. |
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| ISSN: | 1424-8220 |