GEOMETRIC STRUCTURE ENHANCED NITROGEN GAS SENSING ABILITY FROM CARBON NANOTUBES

GEOMETRIC STRUCTURE ENHANCED NITROGEN GAS SENSING ABILITY FROM CARBON NANOTUBES

For decades, the nanostructure of carbon nanotubes (CNTs) have attracted ample attention in the application of gas sensors.However, those CNT-based gas sensors are mostly manufactured in the single or film structures. Until now, the CNT bundlestructure in gas sensors has not yet been investigated by researchers. In this study, the effects of the film and the bundle structure inCNTs are explored. The abundant interstitial and groove sites, beneficial for N2 gas absorption and charge transfer, were providedthrough the CNT bundle with particular geometric structures. In terms of detecting nitrogen gas, the CNT bundle is found to havesignificantly superior sensitivity, faster response and recover time, comparing to the CNT film. Therefore, the geometric structureof CNTs is approved to be one of the features the designers of the gas sensor should take into consideration in the future.