Complex impedance characterization of highly sensitive carbon nanotube gas sensors
MetadataShow full item record
SubjectComplex impadeance characterization; CNT gas sensors; CNT frequency response; Carbon nanotube (CNT) thin films
Complex impedance spectroscopy is used to characterize carbon nanotube (CNT) based gas sensors under the exposure of different concentrations of NH3 (10 ppm, 25 ppm, 50 ppm and 100 ppm). The characterization is performed in a frequency range between 20 Hz and 2 MHz. The frequency response of the CNT film showed high dependence on the film resistance. The variation in the normalized response of the sensor with the frequency might suggest a change in the sensing mechanism at certain frequencies. Moreover, we investigated the effect of different temperatures on the frequency response of the CNT film. Finally, the feasibility of obtaining selective CNT gas sensors based on the sensor recovery characteristics for three different gases (NH3, CO and ethanol) is demonstrated.
Showing items related by title, author, creator and subject.
Melzer K; Bhatt V; Schuster T; Jaworska E; Maksymiuk K; Michalska A; Lugli P; Scarpa G (Institute of Electrical and Electronics Engineers Inc., 2015)We demonstrate the ion-selective response of an electrolyte-gated carbon nanotube network-based field-effect transistor fabricated on a flexible polyimide substrate. Selective response toward the two prominent second ...
Abdellah A; Abdelhalim A; Horn M; Scarpa G; Lugli P (2013)A significant step toward commercialization of novel carbon nanotube (CNT) electronics involves the development of large area and high-throughput processes for the fabrication of high-quality CNT films. In this study, we ...
Highly sensitive and selective carbon nanotube-based gas sensor arrays functionalized with different metallic nanoparticles Abdelhalim A; Winkler M; Loghin F; Zeiser C; Lugli P; Abdellah A (Elsevier, 2015)We present the fabrication and characterization of selective CNT-based gas sensor, which is capable of discriminating between four test gases (NH3, ethanol, CO and CO2). Different metals are utilized in order to alter the ...