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Additive Manufacturing-Enabled Low-Cost Particle Detector

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Conductivity for soot sensing: possibilities and limitations.

Benedikt Grob¹, Johannes Schmid, Natalia P Ivleva

¹Chair for Analytical Chemistry, Institute of Hydrochemistry, Technische Universität München, Munich, Germany.

Analytical Chemistry

|March 30, 2012

Summary

This study explores conductometric soot sensors for vehicle exhaust diagnostics. The research validates a cost-effective sensor principle for real-time soot analysis and structural characterization.

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Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements

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Published on: September 7, 2019

Area of Science:

Materials Science
Analytical Chemistry
Environmental Engineering

Background:

Soot sensing is crucial for vehicle emissions monitoring.
Conductometric principles offer a potentially low-cost sensing method.
Understanding soot's electrical properties is key for sensor development.

Purpose of the Study:

To evaluate the feasibility and limitations of conductometric soot sensing.
To correlate soot structure and composition with electrical conductivity.
To validate the conductometric sensor for on-board exhaust diagnostics.

Main Methods:

Measured electrical conductivity of various carbonaceous materials using the van der Pauw method.
Analyzed structural and oxidation characteristics via Raman microspectroscopy and temperature programmed oxidation.
Employed a thermophoretic precipitator for controlled soot deposition onto electrodes.
Validated the sensor against a photoacoustic soot sensor on a test vehicle.

Main Results:

Electrical conductivity of different soot types was successfully measured.
Percolation theory accurately described the influence of inorganic admixtures on conductivity.
Structural and oxidation properties correlated with electrical conductivity.
The conductometric sensor demonstrated promising performance for on-board diagnostics.

Conclusions:

The conductometric sensor shows significant potential for on-board particle diagnostics.
This method provides a simple, rapid, and inexpensive tool for soot characterization.
Further development could lead to widespread application in emission control systems.