A resistance sensor for use in diesel exhaust is reported. Several soot deposition mechanisms contribute to collection on the sensing electrodes. The sensor is designed to enhance the temperature difference between the electrode surface and the ambient. The resulting thermophoretic force on nanoparticles enhances soot deposition. Exhaust soot concentrations were shown to correlate with resistance decreases and the effect of thermophoresis was studied.

Embedded piezoresistive microcantilever (EPM) sensors were used to detect the presence of the compound estrogen in water samples. The sensor was fabricated with a host material hydrogel (Hypol) functionalized with estrogen antibody. This sensor was able to detect 1 ppm of estrogen in water, responding almost immediately to the estrogen addition, with a full sensor response (saturation) occurring after two minutes of exposure.