High performance mixed potential type No2 gas sensor based on porous YSZ layer formed with graphite doping

Journal article (2019)

Authors

Hao Hong Guizhou University
J. Sun Electronic Components, Technology and Materials - EEMCS , China Research Institute
Cinan Wu Guizhou University
Zewen Liu Tsinghua University
Research Group
Electronic Components, Technology and Materials (EEMCS) (TU Delft)
Copyright: © 2019 Hao Hong, J. Sun, Cinan Wu, Zewen Liu
DOI: https://doi.org/10.3390/s19153337
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Published Date

2019

Language

English

Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Components, Technology and Materials

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.