FACILE SYNTHESIS OF GRAPHENE VIA SULFUR INTERCALATION AND THERMAL EXFOLIATION AND ITS APPLICATION IN ELECTROCHEMICAL SENSING OF L-TRYPTOPHAN

Abstract

An suitable along with an economical production move toward was projected intended for the synthesis of graphene from thermally expanded graphite in a simple and scalable method by sulfur atom intercalation to tailor its properties. Thermally expanded graphite was further subjected to modified Hummer's method and thermally treated to exfoliate graphene (TEG). To detect the sensitivity of L-tryptophan (L-Trp, the amperometric reaction of the TEG adapted glassy carbon electrode (TEG/GCE) exist employed. The TEG/GCE modified electrode behaviors of L-Trp were carefully examined by cyclic voltammetry in the concentration variety of 13 M to 1 mM with a detection limit of 4.3 M (S/N = 3). L-Trp showed enhancement in the oxidation peak existing through a negative shift oxidation (+0.53 V) compared through that on the bare GCE (+0.75 V). Thus, the promising TEG/GCE modified electrode showed that the sensor exhibited high selectivity, reproducibility, and good long-term stability. This modified electrode was also fairly effective for the determination of L-Trp in milk samples.