Stewart, Katherine M. E.Scott, Alison J.Penlidis, Alexander2021-09-292021-09-292020-06-02https://doi.org/10.1002/pat.4877http://hdl.handle.net/10012/17587This is the peer reviewed version of the following article: Stewart, K. M. E., Scott, A. J., & Penlidis, A. (2020). Evaluation of doped and undoped poly (o-anisidine) as sensing materials for a sensor array for volatile organic compounds. Polymers for Advanced Technologies, 31(7), 1474–1483. https://doi.org/10.1002/pat.4877, which has been published in final form at https://doi.org/10.1002/pat.4877. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.Poly (o-anisidine) (PoANI) and PoANI doped with nickel oxide and zinc oxide were evaluated as sensing materials for four gas analytes (methanol, ethanol, acetone, and benzene). The sensing materials had high sensitivity (showing an affinity towards the target analytes even at low concentrations, in the range of 1 ppm to 5 ppm), but rather poor selectivity, especially when the gas analytes were in a mixture. To exploit the poor selectivity, the three sensing materials were combined into a sensor array using principal component analysis (PCA) as a sensing algorithm. It was found that using a sensor array, the four individual gases could be separated. However, when all four gases were present (in analyte mixtures), there was too much overlap in the responses to distinguish between individual gas analytes and their related mixtures.enPoly (o-anisidine)Nickel oxide (NiO)Zinc oxide (ZnO)Gas sensor arrayPrincipal Component Analysis (PCA)Article