Organic nanocomposite sensor for detection of Escherichia coli

Abstract

An organic nanocomposite-based sensor was fabricated to detect Escherichia coli (E. coli) in water. The organic molecule with receptor groups for detection was selected such that the receptor group would bind to the functional groups on the cell wall of the E. coli. The conductivity change of the sensor due to the interaction of E. coli is monitored. The sensor is tested for detecting E. coli cell concentrations of 109 CFU/ml to 108 CFU/ml. The morphology of the sensor film characterized using FESEM shows the presence of micron-size structures, the higher surface area for sensing resulting in a better response of the sensor.