Label free electrochemical detection of stress hormone cortisol using sulphur doped graphitic carbon nitride on carbon fiber paper electrode

Sulphur doped graphitic carbon nitride (S GCN ) was effectively prepared and comprehensively described. A straightforward synthetic process based on thermal condensation was reported for the synthesis of S GCN using thiourea as a precursor. Cyclic voltammetry (CV) and differential pulse voltammetry were used to evaluate the electrochemical performance of cortisol. S GCN sheets were used to boost the electro-catalytic activity, exhibiting very exceptional electrochemical behaviour towards cortisol. As a result, we obtained a broad linear response range of 0.1-100 μM, as well as a comparatively low detection limit (15.8 × 10 −8 M). Furthermore, the fabricated S GCN /CFP electrode shows excellent selectivity in the presence of a large number of possible interfering species. S GCN comprises (C with N and S) heteroatoms, which most likely would have led to a better current response towards cortisol detection. Furthermore, the structural defects that generate additional active sites on the surface of S GCN may enhance the quick electron transfer that occurs during the oxidation of cortisol. Sulphur doped graphitic carbon nitride (S GCN ) was effectively prepared and comprehensively described.