We would like to invite you to the first NARECOM after summer break, which will be devoted to the advanced electrochemical sensors based on graphene derivatives. This seminar will be given by Mgr. Ivan Dědek, Ph.D., from the CATRIN – RCPTM of Palacký University in Olomouc at Wednesday, September 23, 2026 at 2:30 p.m. Join Zoom Meeting https://cesnet.zoom.us/j/94946903938

Sensing with Graphene derivative - Advanced Electrochemical Biosensors

Mgr. Ivan Dědek, Ph.D.

CATRIN – RCPTM, Palacký University in Olomouc, Šlechtitelů Olomouc

Abstract:

Graphene derivatives offer a versatile platform for electrochemical sensing by combining tunable surface chemistry, favorable electron-transfer properties, and compatibility with scalable printing technologies. In our work, nitrogen-doped graphene acid (NGA) has been employed as a functional electrode material for the detection of chemically and biologically diverse analytes. Its high density of carboxyl groups enabled immobilization of DNA, antibodies, and aptamers for selective detection of pork DNA in beef, 25-hydroxy vitamin D3, and the antibiotic ampicillin. NGA-modified electrodes were also applied to direct electrochemical sensing of imidacloprid and dopamine. Beyond material composition, we demonstrated that the deposition method strongly affects coating homogeneity, wetting, interfacial structure, and electrode-to-electrode reproducibility, with inkjet printing providing thin and spatially uniform functional layers compared with conventional drop-casting. More recently, single-atom engineering was integrated with printable NGA inks, where Cu centers provided the strongest enhancement of dopamine oxidation, demonstrating that single-atom identity can be used to tune the sensitivity and selectivity of printed electrochemical interfaces.