Synthesis of Polypyrrole Coated Silver Nanostrip Bundles and Their Application for Detection of Hydrogen Peroxide

We reported a facile synthesis of a stable polypyrrole coated silver nanostrip bundles (Ag NSBs-PPy) by direct reduction of Ag cations in the presence of pyrrole monomers in an aqueous solution of AgNO 3 and NaOH. X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) observations reveal that the Ag cations were completely reduced to Ag and the Ag NSBs-PPy morphology respectively. The observations show that the modified glassy carbon electrode with the Ag NSBs-PPy exhibits a remarkable catalytic performance for hydrogen peroxide (H 2 O 2 ) detection. This is due to the large surface area of Ag NSBs-PPy which increases the ability of the modified electrode to react with H 2 O 2 . The sensor has a fast amperometric response time of less than 5 s. The detection limit and limit of quantification (S/N = 3) of two linear segments (low and high concentration of H 2 O 2 ) are estimated as 0.68 μmol L −1 , 2.27 μmol L −1 and 13.10 μmol L −1 , 43.60 μmol L −1 , respectively. In addition, the sensitivity for these two linear segments is 9.701 μA μM −1 and 0.506 μA μM −1 respectively.