A copolymer of pyrrole and o-aminophenol was synthesized by single step oxidative polymerization technique. Two different nanocomposites of copolymer with α-Fe 2 O 3 and Co-α-Fe 2 O 3 were prepared and acetone sensing property of both composites were studied at room temperature with different gas concentrations. The calculated sensitivity of the Co-α-Fe 2 O 3 nanocomposite was 0.68 and α-Fe 2 O 3 nanocomposite was 0.44. The sensitivity of prepared composites was higher than the pure polymer.The LOD of the α-Fe 2 O 3 composite was found to be 0.13 ppm and Co-α-Fe 2 O 3 composite was 0.37 ppm. Both the prepared composites have showed excellent selectivity with good repeatability for the acetone gas. The 20% Co-Fe 2 O 3 containing nanocomposite sensor exhibited faster response time of 1.4 s and recovery time of 4.4 s towards the target gas and 15% α-Fe 2 O 3 containing nanocomposite sensor exhibited the response time of 1.4 s and recovery time of 4.8 s for the acetone gas.The polymer and the nanocomposites have shown excellent repeatability for 7 cycles.The faster response of the sensor can be attributed to the increased number of oxygen vacancies on the sensor as well as the free O H groups present in the polymer back bone.
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