Functionalization of Graphene Oxide with 3-Mercaptopropyltrimethoxysilane and Its Electrocatalytic Activity in Aqueous Medium

In this work, a highly dispersed graphene oxide (GO) was successfully functionalized with 3-mercaptopropyltrimethoxysilane (MPTS) molecule by silanization method. The chemically generated GO and MPTS functionalized GO (MPTS-GO) were structurally characterized by thermogravimetric analysis (TGA), X-ray diffraction analysis (XRD), scanning electron microscope (SEM), energy dispersive X-ray (EDAX), fourier transform infrared spectroscopy (FT-IR) and ultraviolet visible spectroscopy (UV-Vis) techniques. The MPTS-GO is highly suspensable in water. The thermal and conductivity results for MPTS-GO are significantly increased compared to GO. Moreover, glassy carbon electrode modified with MPTS-GO hybrid (MPTS-GO/GCE) was prepared by casting of the MPTS-GO solution on GCE. The MPTS-GO/GCE showed an excellent electrocatalytic activity towards methionine (Met). This was understood from the observed less positive oxidation potential and higher oxidation current when compared to bare GC electrode. The MPTS-GO has excellent electrocatalytic activity, making it an ideal candidate for sensor applications.