Nanocomposite Based on CNT embedded in Water Soluble Conjugated Polyelectrolyte for the Electrochemical Sensing Barium(II) ion

In this present study, CNT was embedded into the Conjugated Polyelectrolyte (CPE-K) matrix as support and used as an electrode probe material (CPE-K/CNT) for barium ion sensing with improving the current response. Prepared composite has been characterized by Scanning electron microscopy (SEM). It has been confirmed by the SEM studies that homogenous dispersion of CPEK modified CNT in a polymer matrix. The slurry of CPE-K/CNT nanocomposites in ethanol was used to coat on a glassy carbon electrode (GCE), which implemented to develop the selective barium ion (Ba2+) sensor probe. The assembled sensor probe was found to respond in a linearly over large concentration range (0.1nM~0.01mM) on the current vs. Ba2+ ion concentration, which referred to as “calibration curve”. The sensor’s appreciable sensitivity (12.8481μAμM-1cm-2) is found from the slope of calibration curve by considering the GCE surface area (0.0316cm2). The detection limit (93.28±4.66pM) is calculated from S/N ratio at 3. In the real sample’s analysis, it is found the fabricated sensor probe effective and reliable for the detection of target cations.