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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2025-07-06 15:47 |
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Conference: Bucharest University Faculty of Physics 2025 Meeting
Section: Polymer Physics
Title:
Interdigitated Electrode Sensors with Carbon-Polymer Composite Layers: Versatile Platforms for High-Sensitivity Chemical and Biological Detection
Authors:
Bogdan BITA(1,2), Ana Maria IORDACHE(1), Ana Maria FLOREA (1,2), Stefan CARAMIZOIU (1,2), Cristina VASILIU (1), Irinela CHILIBON (1), Stefan Marian IORDACHE (1)
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Affiliation:
1) Optospintronics Department, National Institute of Research and Development for Optoelectronics -INOE 2000, 409 Atomistilor, 077125, Magurele, Romania;
2) Department of Electricity, Solid-State Physics and Biophysics, Faculty of Physics, University of Bucharest, 11405 Atomistilor, 077125, Magurele, Romania;
E-mail
bogdan.bita@inoe.ro
Keywords:
Interdigitated electrodes (IDE), carbon-polymer composites, chemical sensing, biological detection
Abstract:
Interdigitated electrode (IDE) sensors incorporating carbon-polymer composite sensitive layers have emerged as versatile platforms for detecting various chemical and biological analytes. The interdigitated structure provides a large surface area and high sensitivity due to the fringing electric field between electrode fingers, allowing effective interaction with the surrounding environment[1]. In this configuration, a conductive carbon-based material, such as carbon black, carbon nanotubes, or graphene, is dispersed within a polymer matrix to form a composite sensitive layer deposited over the IDE structure. The synergy between the conductive carbon filler and the insulating polymer enables tunable electrical properties and selective analyte interactions. Upon exposure to target substances, such as volatile organic compounds (VOCs), gases, or biomolecules, the composite layer undergoes electrical conductivity or impedance changes, which are transduced into measurable signals. The choice of polymer significantly influences selectivity and sensitivity, while the carbon filler determines the baseline conductivity and mechanical flexibility. These sensors offer room-temperature operation, low power consumption, mechanical robustness, and potential for miniaturisation and integration into flexible electronics. Applications span environmental monitoring, food quality control, medical diagnostics, and wearable sensing. Ongoing research focuses on optimising the carbon-polymer composite's composition, morphology, and fabrication techniques to enhance performance parameters such as response time, recovery, and long-term stability[2]. Integrating nanostructured carbon materials and advanced polymer systems continues to expand the capabilities of IDE sensors in real-time, low-cost sensing applications.
References:
[1] Pan, Y., Zhang, J., Guo, X., Li, Y., Li, L., & Pan, L. (2024). Recent advances in conductive Polymers-Based electrochemical sensors for biomedical and environmental applications. Polymers, 16(11), 1597. https://doi.org/10.3390/polym16111597
[2] Lopes, C., Araújo, A., Silva, F., Pappas, P., Termine, S., Trompeta, A. A., Charitidis, C. A., Martins, C., Mould, S. T., & Santos, R. M. (2024). Smart Carbon Fiber-Reinforced polymer composites for damage sensing and On-Line structural health monitoring applications. Polymers, 16(19), 2698. https://doi.org/10.3390/polym16192698
Acknowledgement:
The author's work was supported by the CORE Program, carried out with the support of MCID, project no. PN 23 05.
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