Indium
OxideSingle-Walled Carbon Nanotube
Composite for Ethanol Sensing at Room Temperature
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Abstract
Utilizing a sol-gel synthesis, indium
oxide is grown on the surface
of oxidized single-walled carbon nanotubes (SWCNT) to form a hybrid
material with high conductivity and sensitivity toward certain organic
vapors. The room-temperature sensing of dilute ethanol and acetone
vapors on the surface of indium oxide/SWCNT hybrid material is studied
using electrical conductance experiments in a nonoxidizing environment.
Through testing of variously calcinated materials, it was observed
that the degree of annealing greatly affects the material’s
response to acetone and ethanol, such that the intermediate calcination
condition yields the best sensitivity. DFT simulations are used to
study the interface between defective SWCNT and indium oxide, as well
as the interaction between ethanol and acetone molecules with the
indium oxide/SWCNT hybrid material