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Interdigitated Electrode for Electrical Characterization of Commercial Pseudo-Binary Biodiesel-Diesel Blends
Inocêncio Sanches Dos Santos-Neto1, Christian Diniz Carvalho1, Gilberto Balby Araújo Filho1
1Department of Electrical Engineering, Campus Bacanga, Federal University of Maranhão, São Luís 65080-805, Brazil.
Sensors (Basel, Switzerland)
|November 13, 2021
Summary
A new impedance spectroscopy method using interdigitated sensors accurately estimates biodiesel-diesel fuel blends. This analytical technique offers a simple way to determine fuel mixture ratios, crucial for environmental and health safety.
Area of Science:
- Analytical Chemistry
- Materials Science
- Sensor Technology
Background:
- Non-standard diesel blends pose risks to the environment and human health.
- Accurate estimation of biodiesel-diesel ratios is essential for quality control and safety.
Purpose of the Study:
- To develop a simple analytical method for estimating biodiesel-diesel mixture ratios.
- To design and evaluate interdigitated sensors for fuel analysis using impedance spectroscopy.
Main Methods:
- Simulations using COMSOL Multiphysics to optimize interdigitated sensor geometry.
- Fabrication and characterization of interdigitated electrodes (Au on SiO2).
- Electrical characterization using impedance spectroscopy (IS) for fuel analysis.
Main Results:
- Optimized sensor geometry identified (W=20µm, L=1000µm, G=50µm, N=40).
- X-ray diffraction confirmed no phase alteration of the substrate.
- AFM/SEM revealed nanometric roughness and irregular electrode edges.
- Impedance spectroscopy successfully differentiated biodiesel, diesel, and their mixtures in the low-frequency region.
Conclusions:
- The developed impedance spectroscopy method with interdigitated sensors is effective for determining biodiesel-diesel blend ratios.
- Optimized sensor design and fabrication are critical for reliable fuel analysis.
- This technique provides a simple and potentially cost-effective solution for fuel quality assessment.
