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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2025-07-06 15:49 |
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Conference: Bucharest University Faculty of Physics 2025 Meeting
Section: Solid State Physics and Materials Science
Title:
Interdigitated electrode (IDE) sensors
Authors:
Zichisanu Matei(1),Bogdan Bita(1,2), Stefan Caramizoiu(1,2), Stefan Iordache(2)
*
Affiliation:
1)Department of Electricity, Solid-State Physics and Biophysics, Faculty of Physics, University of Bucharest, 11405 Atomistilor, 077125, Magurele, Romania;
2)Optospintronics Department, National Institute of Research and Development for Optoelectronics -INOE 82000, 409 Atomistilor, 077125, Magurele, Romania;
E-mail
matei.zichisanu@gmail.com
Keywords:
Interdigitated electrodes (IDE), Metal oxide, gases, chemiresistive sensors,
Abstract:
Interdigitated electrode (IDE) sensors that use a resistive transduction mechanism represent a promising solution for environmental monitoring and air quality analysis. The IDE architecture, composed of interlaced metallic electrodes with a substrate deposition , creates a high-density electric field region that favors interaction with target gases. When combined with sensitive semiconducting or composite materials—such as metal oxides (e.g., SnO₂, ZnO), carbon nanotubes, or polymer-nanoparticle mixtures—these sensors exhibit remarkable sensitivity to a wide range of atmospheric pollutants and harmful airborne substances.
The operating principle of resistive IDE sensors is based on changes in electrical resistance caused by the adsorption of gas molecules onto the active layer. This process modifies the charge distribution or the concentration of charge carriers, enabling the detection of gases such as nitrogen dioxide, carbon monoxide,ozone, ammonia and other organic compounds . The IDE is particularly suitable for miniaturized and scalable sensor platforms due to its planar geometry, compatibility with standard microfabrication techniques and high sensitivity .
Materials used can be doped to improve selectivity and sensitivity,while the IDE design ensures low power consumption and a fast response time. The integration of nanostructured sensitive layers,, could further enhance performance by increasing the detector’s sensible surface, area-to-volume ratio and electron mobility.
Resistive IDE sensors are finding increased usage in diverse applications in environmental control systems, industrial safety, indoor air quality monitoring, and smart city infrastructure. Current research addresses difficulties such as cross-sensitivity, environmental interferences, and long-term stability.
References:
Aghili, H. F., Yousefi, R., & Ghaffari, M. (2019). Sensor properties of Pd doped SnO₂ nanofiber enshrouded with functionalized MWCNT. arXiv preprint. https://arxiv.org/abs/1906.03031
Jalali, S. A. H., Ghaffari, M., & Yousefi, R. (2022). Investigating organic vapor sensing properties of composite carbon nanotube-zinc oxide nanowire. Chemosensors, 10(6), 205. https://doi.org/10.3390/chemosensors10060205
Joshi, R. K., & Kim, K. S. (2017). Carbon nanotube-based chemiresistive sensors. Sensors, 17(4), 882. https://doi.org/10.3390/s17040882
Saleh, T. A. (2020). Chemiresistive sensor arrays for detection of air pollutants based on carbon nanotubes functionalized with porphyrin and phthalocyanine derivatives. Materials Today: Proceedings, 33, 48–53. https://doi.org/10.1016/j.matpr.2020.04.539
Zare, H., & Jafari, M. (2021). Facile flexible sensors based on CNT-metal oxide nanocomposites for CO₂ sensing. EAI Endorsed Transactions on Internet of Things, 7(25), e6. https://doi.org/10.4108/eai.7-12-2021.2314737
Zhang, Y., Luo, J., Yu, L., & Zhang, C. (2017). Resistive gas sensors based on interdigitated electrodes for detecting volatile organic compounds and toxic gases. Sensors and Actuators B: Chemical, 255, 61–68. https://doi.org/10.1016/j.snb.2017.06.146
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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