Thin films of functionalized carbon nanotubes were deposited on silicon chips by drop-coating and inkjet printing. These sensors were exposed to 50 ppm N2O, CO, H2S and H2O vapour in dry synthetic air. We have found relatively small changes in the electrical resistance of the films exposed to the different test gases. However it is shown that chemical classification of the test gases could still be achieved. To this end pattern recognition technique (Principal Component Analysis) was applied on the acquired power spectral density of the stationary resistance fluctuations of the sensors. The method, whereby fluctuations are used to increase the chemical selectivity of electronic sensors, is called fluctuation enhanced sensing.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics