Discriminative detection of indoor volatile organic compounds using a sensor array based on pure and Fe-doped In2O3 nanofibers

•Fabrication of a sensor array using pure and Fe-doped In2O3 nanofibers.•Discriminative detection of benzene, xylene, toluene, ethanol, and formaldehyde.•Distinction between aromatic and non-aromatic indoor pollutants using sensor array.•Gas sensing mechanism underlying Fe-induced change in response and selectivity.