Role of en-APTAS Membranes in Enhancing the NO<sub>2</sub> Gas-Sensing Characteristics of Carbon Nanotube/ZnO-Based Memristor Gas Sensors
NO<sub>2</sub> is a toxic gas that can damage the lungs with prolonged exposure and contribute to health conditions, such as asthma in children. Detecting NO<sub>2</sub> is therefore crucial for maintaining a healthy environment. Carbon nanotubes (CNTs) are promising material...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
|
| Series: | Biosensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-6374/14/12/635 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | NO<sub>2</sub> is a toxic gas that can damage the lungs with prolonged exposure and contribute to health conditions, such as asthma in children. Detecting NO<sub>2</sub> is therefore crucial for maintaining a healthy environment. Carbon nanotubes (CNTs) are promising materials for NO<sub>2</sub> gas sensors due to their excellent electronic properties and high adsorption energy for NO<sub>2</sub> molecules. However, conventional CNT-based sensors face challenges, including low responses at room temperature (RT) and slow recovery times. This study introduces a memristor-based NO<sub>2</sub> gas sensor comprising CNT/ZnO/ITO decorated with an N-[3-(trimethoxysilyl)propyl] ethylene diamine (en-APTAS) membrane to enhance room-temperature-sensing performance. The amine groups in the en-APTAS membrane increase adsorption sites and boost charge transfer interactions between NO<sub>2</sub> and the CNT surface. This modification improves the sensor’s response by 60% at 20 ppm compared to the undecorated counterpart. However, the high adsorption energy of NO<sub>2</sub> slows the recovery process. To overcome this, a pulse-recovery method was implemented, applying a −2.5 V pulse with a 1 ms width, enabling the sensor to return to its baseline within 1 ms. These findings highlight the effectiveness of en-APTAS decoration and pulse-recovery techniques in improving the sensitivity, response, and recovery of CNT-based gas sensors. |
|---|---|
| ISSN: | 2079-6374 |