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Environmental Monitoring of Low-ppb Ammonia Concentrations Based on Single-wall Carbon Nanotube Chemiresistor Gas Sensors: Detection Limits, Response Dynamics, and Moisture Effects☆
| Content Provider | Semantic Scholar |
|---|---|
| Author | Rigoni, Federica Tognolini, Silvia Borghetti, Patrizia Drera, Giovanni Pagliara, Stefania Goldoni, Andrea Sangaletti, Luigi |
| Copyright Year | 2014 |
| Abstract | Abstract We present single-wall carbon nanotube (SWCNT) chemiresistor gas sensor (CGS) operating at room temperature, displaying an enhanced sensitivity to NH3. Ammonia concentrations in the full range of the average [NH3] in a urban environment have been measured, and a detection limit of 3 ppb is demonstrated, which is well below the sensitivities so far reported for non- functionalized SWCNTs operating at room temperature. Different materials were tested as substrates, including cheap plastic flexible substrates. In addition to a careful preparation of the SWCNT layers, the low-ppb limit is also attained by revealing and properly tracking a fast dynamics during the desorption process. On the basis of these results a model of the CGS response vs time is proposed. When functionalized with indium-tin oxide nanoparticles, a sensitivity increase is detected, along with a remarkable selectivity towards moisture. |
| Starting Page | 716 |
| Ending Page | 719 |
| Page Count | 4 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/j.proeng.2014.11.638 |
| Volume Number | 87 |
| Alternate Webpage(s) | https://core.ac.uk/download/pdf/82757491.pdf |
| Alternate Webpage(s) | https://doi.org/10.1016/j.proeng.2014.11.638 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
