Quan Diao

5.5.4 Progress in solid electrochemical gas sensors based on NASICON and oxide electrodes

The mixed-potential type NASICON-based sensor attached with an oxide electrode is generally used at intermediate temperatures and more suitable for monitoring the harmful and toxic gases in the atmospheric environment. This presentation focuses on the exploration of new oxide electrode materials and the design of new sensor structure for increasing the sensing performance of the sensor based on NASICON and oxide electrode.

Research on Electronic Nose for the Pre-evaluation of the Vinegar Quality

In this study, we design a kind of electronic nose, which contains a MQ-3-type gas sensor, five TGS series gas sensors and a collection circuit with the LPC2138 microprocessor as the core. The collected data are uploaded to a computer through the USB, real-time displayed by using host computer LabVIEW software, and analyzed using principal component analysis (PCA) and linear discriminant analysis (LDA). This designed electronic nose has been used to measure five kinds of vinegar, vinegar types, and ingredients relation of which were analyzed. The results show that electronic nose technology is potential in vinegar quality pre-evalution.

High-performance of planar NO 2 sensor using stabilized zirconia and NiO sensing electrode synthesized by microwave at high temperature

This paper focuses on the gas sensing properties of the mixed-potential-type yttria stabilized zirconia (YSZ)-based NO2 sensor with NiO sensing electrode. The sensing characteristics of the sensors have been improved by controlling the microstructure of NiO sensing electrode synthesized with the microwave. The microstructure of NiO strongly depended on the microwave treatment temperature and the sintering temperature. The largest sensitivity of the sensor was obtained by using the NiO synthesized at 60°C and sintered at 1200°C, the slope of the dependence of EMF on the NO2 concentration in the range of 20–500 ppm was 54 mV/decade at 850°C. It was also seen that the sensor showed a speedy response and recovery kinetics to NO2. The sensing mechanism was confirmed to involve in the microstructure of oxide sensing electrode.

Mixed-potential type NO x sensor using stabilized zirconia and Cr 2 O 3 -WO 3 nanocomposites

Solid state electrochemical sensors using yttria-stabilized zirconia (YSZ) plate and Cr 2 O 3 -WO 3 nanocomposites were fabricated. The effects of the sintering temperature on the electrode microstructure were investigated. It was found that the sensor sintered at 1000 °C exhibited larger sensitivity to NO 2 in the examined range of 20–300ppm than other sensors sintered at 800 °C, 900 °C, and 1100 °C; and it was speculated that the microstructure of the SE was the primary factor. The NO 2 sensing characteristics of the sensors were examined at high temperature.