Sensing of Dibutyl Sulfide Using Carboxylic Acid Functionalized Single Walled Nanotubes
Functionalization group enhanced the response, sensitivity and repeatability of the gas sensor towards target analyte. In this paper we are reporting, fabrication of carboxylic acid functionalized single walled nanotubes (SWCNT-COOH) based gas sensor for sensing of Dibutyl Sulfide (DBS) a simulant of sulfur mustards. These gas sensors are fabricated by vacuum filtration method on flexible membrane. These fabricated gas sensor films are characterized by using SEM and Raman spectroscopy. It is observed that, CNTs are randomly distributed on the gas sensor surface. The Id/Ig ratio is 0.049, which indicates defect present on the gas sensor surface due to functionalization. These gas sensors are exposed to 3.36 ppm of DBS generated by permeation tube. The gas sensor gives repeatable response over five exposed cycles for 3.36 ppm of DBS. The detection limit of the gas sensor is <21 ppb of DBS.
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