One-pot synthesis of porphyrin@polypyrrole hybrid and its application as an electrochemical sensor

In this work, hybrid of polypyrrole with meso-(tetracarboxyphenyl)porphyrin (TCPP@ppy) was prepared by a simple one-pot chemical oxidative polymerization method using ammonium persulfate (APS) as the oxidizing agent. Fourier transform infrared spectroscopy (FT-IR) revealed its successful formation with the presence of N H, C=O and other characteristic peaks of polypyrrole and meso-(tetracarboxyphenyl)porphyrin (TCPP) which was also corroborated by ultraviolet visible (UV Vis) spectroscopy and X-ray diffraction (XRD) studies with a red shifted Soret band of TCPP and a broad peak at 2 theta = 219 degrees including distinctive TCPP peaks respectively. This denoted that interaction took place between various components. High-resolution transmission electron microscopy (HR-TEM) micrographs of the hybrid depicted TCPP molecules to be encapsulated by ppy matrix. Cyclic voltammetry studies illustrated high electroactivity for the hybrid and ppy. Electrochemical sensor was developed using TCPP@ppy for the detection of cadmium (II) ions (Cd2+) by differential pulse voltammetry technique, thus exhibiting its application as a metal ion sensor.