| Title | Effects of reducing interferers in a binary gas mixture on NO2 gas adsorption using carbon nanotube networked films based chemiresistors |
|---|---|
| Publication Type | Articolo su Rivista peer-reviewed |
| Year of Publication | 2009 |
| Authors | Penza, Michele, Rossi R., Alvisi Marco, Signore M.A., and Serra Emanuele |
| Journal | Journal of Physics D: Applied Physics |
| Volume | 42 |
| ISSN | 00223727 |
| Keywords | Adsorbed gas, Adsorption, Alumina substrates, Analytes, Au nanoclusters, Binary gas mixtures, Binary mixtures, Carbon films, Carbon nanotubes, Charge transfer, Charge transports, Chemical detections, Chemical vapour depositions, Chemiresistor, Chemiresistors, CNT films, cobalt, Electrical charges, Electrical transports, Electron-donating, Functionalization, Gas mixtures, Gold, Ion exchange, Limit of detections, Nano-sized catalysts, P types, Plasma deposition, Plasma enhanced chemical vapor deposition, Real-world, Sensor networks, Sensor response, Sensors, Target electrons, Working conditions |
| Abstract | Analysis of binary gas mixtures using chemiresistors based on carbon nanotubes (CNTs) networked films has been performed for chemical detection up to a sub-ppm level. The effects of individual interfering analytes of reducing H2S and NH3 gases on oxidizing NO2 gas adsorption in CNTs tangled films are considered. The CNTs are grown by plasma-enhanced chemical vapour deposition technology onto inexpensive alumina substrates, coated by cobalt nanosized catalyst. Charge transfer between adsorbed gas molecules and CNT networks, characterized by a semiconducting p-type electrical transport, occurs depending on opposite trend in the sensor response to the electron-donating interfering gases (H2S, NH 3) and target electron-withdrawing NO2 gas causing a compensation of the charge transport, upon given working conditions. This compensated exchange of electrical charge affects the limit of detection of the targeted NO2 gas sensed in different real-world binary gas mixtures of reducing interferers of H2S and NH3. In addition, the functionalization of the CNT films with Au nanoclusters enhanced the sensitivity of the chemiresistor and tuned the compensation of electrical charge crossover in the selected binary oxido-reducing mixtures. © 2009 IOP Publishing Ltd. |
| Notes | cited By 10 |
| URL | https://www.scopus.com/inward/record.uri?eid=2-s2.0-63649094166&doi=10.1088%2f0022-3727%2f42%2f7%2f072002&partnerID=40&md5=edb2d90f01d488f2a4949ea7cb89e356 |
| DOI | 10.1088/0022-3727/42/7/072002 |
| Citation Key | Penza2009 |
