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

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 µM to 1 mM with a detection limit of 4.3 µM (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