CC BY
2*
ALT'23
The 30th International Conference on Advanced Laser Technologies
LM-O-8
Laser-assisted synthesis of electrode materials
E. Khaiiullina, A. Levshakova, I. Tumkin, M. Panov, A. Manshina
St Petersburg University, 7/9 Universitetskaya Emb.,St Petersburg 199034, Russia
Enzyme-free electrochemical sensors are a rapidly advancing class of devices that hold significant potential for applications in biomedical diagnostics and environmental monitoring. These sensors offer a key advantage of high sensitivity, achieved through direct electron transfer from the analyte to the electrode's electrocatalytic active center, eliminating the need for mediators or enzymes. Notably, enzyme-free sensors exhibit enhanced stability and reliability compared to their enzyme-based counterparts, overcoming limitations associated with enzyme denaturation and degradation, ensuring a longer shelf life.
This study focuses on the development of laser-based approaches for synthesizing working electrodes specifically designed for enzyme-free detection of diverse analytes. Laser synthesis methods offer distinct advantages over traditional techniques, including scalability and precise localization, enabling the fabrication of electrodes with custom geometries on substrates of arbitrary shapes. The combination of laser synthesis with wet chemistry approaches allows for the creation of a wide range of composite systems with improved sensing characteristics, such as heightened sensitivity and extended detectable concentration ranges. Specific emphasis is placed on two methodologies: laser-induced deposition solution (LCLD) and laser activation of dielectric surfaces followed by copper deposition. These approaches enable the localized formation of metallic structures on dielectric surfaces. Optimization of laser exposure conditions, development of techniques for synthesizing materials with superior adhesion and electrical conductivity, and methods for surface modification to enhance electrochemical activity towards the target analyte are explored. The electrocatalytic activity towards the target analytes is evaluated using cyclic voltammetry and amperometry techniques. Additionally, the study comprehensively investigates the effects of common interfering impurities and examines the long-term stability of the sensory properties.
Authors expresses their gratitude to the Russian Science Foundation (Project № 23-29-00493). The authors would also like to thank the SPbSU Nanotechnology Interdisciplinary Centre, the Centre for Physical Methods of Surface Investigation, the Centre for Optical and Laser Materials Research, and the Centre for X-ray Diffraction Studies.
