Room temperature carbon nanotube based sensor for carbon monoxide detection

Abstract

Abstract. Sulfonated single-walled carbon nanotubes have been used in an integrated electrode structure for the detection of carbon monoxide. The sensor responds to 0.5 ppm of CO in air at room temperature. All eight sensors with this material in a 32-sensor array showed good repeatability and reproducibility, with response and recovery times of about 10 s. Pristine nanotubes generally do not respond to carbon monoxide and the results here confirm sulfonated nanotubes to be a potential candidate for the construction of an electronic nose that requires at least a few materials for the selective detection of CO.

Room temperature CO sensing by polyaniline/Co3O4 nanocomposite

“…30 The stable resonance structure of 1 CBO 2 withdraws the lone pair of electron from the amine nitrogen (ANHA) in PANI, thus transferring the positive charge from the carbon of CO to the amine nitrogen of PANI. 39 It should be noted that in these cases the sensor response is much lower than that reported by us. Figures 9 and 10 shows the response versus time curve of PANI/ HC/Co 3 O 4 nanocomposites for 50 and 75 ppm CO concentrations, respectively.…”

“…Another SWCNT-based sensor reported a response factor <0.014 for 50 ppm CO concentration at room temperature. 39 It should be noted that in these cases the sensor response is much lower than that reported by us.…”

Nanoelectronics and nanosensors for space exploration

“…Figure 4b shows the sensor response upon exposure to CO under 65% relative humidity. 69 After the chip had been purged in dry air for 5 min, 65% humidity was introduced for 25 min. The sensor resistance increased signifi cantly in the presence of humidity, but returned to the baseline after about 20 min.…”

Highly Sensitive Detection of NO2 by Au and TiO2 Nanoparticles Decorated SWCNTs Sensors

“…Appreciable responses have been observed using field emitter transistor (FET) gas sensors based on CNTs for detecting NO 2 and NH 3 , carbon monoxide (CO), H 2 S, and volatile organic compounds such as ethanol and methanol [19][20][21]. The functionalization of CNTs by metal nanoparticles, metal oxides (MOXs), and different polymers proved to cause an appreciable variation in the electronics properties and to enhance the selectivity and gas sensitivity [13,[22][23][24]. Hybrid CNTs-metal oxides-based gas sensors typically show impressive and superior performance with respect to the pristine material, showing a significant reduction of the sensors' working temperature [25][26][27][28].…”