Graphite Oxide-Silicone Rubber Composite modified carbon paste electrode as electrochemical sensor for Propranolol determination

Abstract

The objectives of this work were to create a graphite oxide (GO) and silicone rubber (SR) composite (GSRC), analyze its mechanical and electrochemical capabilities, and use it to determine propranolol (PRN) electrochemically. The surface morphology and crystal structure of GSRC were studied, and the results showed that a porous GSRC sample was successfully formed. According to a study on mechanical properties, the addition of GO can improve the mechanical qualities of GSRC before and after thermal oxidative aging. The electrochemical properties of the GSRC modified carbon paste electrode (GSRC/CPE) for PRN measurement revealed that it was sensitive, stable, and selective. According to amperometry tests, increasing PRN concentration per step from 1 to 340 M resulted in a linear rise. The detection limit (S/N=3) and sensitivity of 15 nM and 0.2003 A/M, respectively, were obtained. The performance of GSRC/CPE as a PRN sensor was comparable or better than that of some of the recently reported PRN sensors, which was attributed to the synergistic catalytic impact of GO and SR in the composite