A planar, impedancemetric NO2 sensor based on NiO nanoparticles sensing electrode

作者：Wang Ling^*; Hao Zeng Chuan; Dai Lei; Li Yuehua; Zhou Huizhu

来源：Materials Letters, 2012, 87: 24-27.

DOI：10.1016/j.matlet.2012.06.032

• Bi-layer
• Complex impedance
• Counter electrodes
• Fast response
• Frequency ranges
• High sensitivity
• Impedancemetric-type
• Low frequency
• Nano-structured
• Nickel nitrate
• NiO nanoparticles
• NiO sensing electrode
• Oxygen concentrations
• Porous layers
• Resistance values
• Response signal
• Sensing electrode
• Simple structures
• Temperature range
• YSZ

A planar, impedancemetric NO2 sensor with 8% yttria stabilized zirconia (YSZ) as electrolyte and NiO nanoparticles as sensing electrode and a Pt counter electrode was fabricated and tested. The nano-structured NiO sensing electrode was fabricated by infiltrating aqueous solutions of nickel nitrate into porous layer in a bilayer yttria-stabilized zirconia (YSZ) pellet, followed by calcination at 800 °C for 3 h. The complex impedance of the device was measured in the frequency range of 0.1-100 kHz and in the temperature range of 500-600°C, respectively. The resistance value (Z′) of the device at low frequency varied with concentration of NO2 in sample gases. The response signal (|Z|base-|Z|gas) at 0.1 Hz of the present device was found to vary almost linearly with the logarithm of NO2 concentration from 20 to 300 ppm at fixed oxygen concentrations at 500-600°C. The present sensor has many advantages, such as, simple structure, easy preparation, fast response and high sensitivity.

• 出版日期2012