Study of SWNTs based sensor network density on analyte detection limit

With increasing research in sensors development and fabrications, the sensitivity is found to be a foremost factor which demands optimization to attain desirable response. In order to do so, network density need to be subjected and investigates its correlations with sensor sensitivity. This particular study examines the impact of network density on sensor responsiveness. In order to explore the impact of SWNTs concentration density onto the fabricated sensor behaviour, the surface morphology has been examined by Raman Spectroscopy and resistance analysis onto as fabricated sensor samples. Furthermore, flexible SWNTs thick film gas resistor (CNT-TFR) has been generated using the vacuum filtering technique. The sensing measures of these manufactured sensors are examined by exposing them to NO ₂ concentrations ranging from 0.5 ppm to 10 ppm for duration of 3 minutes. The sensor exhibiting a concentration of 5 mg/L demonstrates the most pronounced response compared to the other sensors. The influence of network density on the ability to adsorb, heterogeneity, signal-to-noise ratio, and detection limit was also examined. The repeatability and selectivity were further examined to determine the ideal density of the sensor.