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In this work, tin oxide (SnO2)/multi-walled carbon nanotube (MWCNT) compositebased ethanol sensor that exhibits fast response/recovery behaviour, largesensitivity, and good selectivity was demonstrated. First, Pd doped SnO2(SnO2-Pd) nanofibers was prepared on the interdigitated electrodes (IDE) usingelectrospinning technique, followed by calcination at 600 0C for 2 h. Then,carboxylic acid modified multi-walled carbon nanotube (MWCNT-COOH) was droppedon the nanofibers and allowed to dry at RT. Next, the thin films werecharacterized by field emission scanning electron microscopy (FE-SEM),transmission electron microscopy (TEM), X-ray diffraction (XRD) andthermogravimetric analysis (TGA). Finally, chemical sensing behaviors of thesensors were analyzed against to ethanol (ETH), toluene (TOL),trichloroethylene (TCE), acetone (ACE) and binary mixing with water. It wasdemonstrated that increasing the temperature and gas concentration has led toincreased sensor response for SnO2-Pd nanofiber system. However, there was nogeneral rule found for MWCNT-COOH coated SnO2-Pd nanofiber system. A novelsensing mechanism was offered for the composite structure.

Sensor properties of Pd doped SnO2 nanofiber enshrouded with functionalized MWCNT