PEDOT:PSS/MWCNTs-COOH/PVP and PEDOT:PSS/PVP nanofibers were successfully fabricated by electrospinning in order to use as a chemiresistor for detecting the aromatic volatile organic compounds (VOCs) for the first time. The response magnitudes and the cyclic tests of electrospun PEDOT:PSS/MWCNTs-COOH/PVP and PEDOT:PSS/PVP nanofibers to benzene. toluene, and o-xylene vapors were investigated. It was found that electrospun PEDOT:PSS/MWCNTs-COOH/PVP nanofibers showed much enhanced response magnitude than that of electrospun PEDOT:PSS/PVP nanofibers to benzene, toluene, and o-xylene, respectively. Also, electrospun PEDOT:PSS/MWCNTs-COOH/PVP and PEDOT:PSS/PVP nanofibers displayed reversible and reproducible responses to benzene vapor at FOOM temperature. (C) 2012 Elsevier B.V. All rights reserved.