High Performance Mixed Potential Type NO2 Gas Sensor Based on Porous YSZ Layer Formed with Graphite Doping

Abstract

High performance mixed potential type NO2 sensors using porous yttria-stabilized zirconia (YSZ) layers doped with different concentration graphite as solid electrolyte and LaFeO3 as sensing electrode were fabricated and characterized. LaFeO3 was prepared by a typical citrate sol–gel method and characterized using XRD. The surface morphology and porosity of porous YSZ layers were characterized by field emission scanning electron microscope (FESEM). The sensor doped with 3 wt% graphite shows the highest response (−76.4 mV to 80 ppm NO2) and the response is linearly dependent on the logarithm of NO2 concentration in the range of 10–200 ppm. The sensor measurement results also present good repeatability and cross-sensitivity.

Nanoscale Ag/WO3 Multilayered Fabry–Perot Cavities for Colorimetric NO2 Sensing

“…Commercial corrosive gas sensors, including the NO 2 gas sensor, operate at high temperatures and have limited applications owing to wiring, power consumption, and heating issues. , However, the wireless color-based gas sensor can be fabricated on flexible substrates without additional heaters and data acquisition equipment, thus expanding the applications of gas sensors, including wearable devices . The performance evaluation of the proposed sensor fabricated on a flexible PI film was conducted to demonstrate its versatility.…”