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Investigations on the Sensing Mechanism of Humidity Sensors Based on Poly(4-vinylpyridine)/carbon Black Composite by ac impedance spectra

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复旦学报（自然科学版） 2007年第5期46卷 796-页

作者： Hong Li-jie, Li Yang, Yang Mu-jie(Department of Polymer Science and Engineering, Zhejiang University,Hangzhou 310027, China) Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027

1 Results Investigations on the sensing mechanism is important for understanding the electrical responses of humidity sensors to humidity change,and could provide guidelines for the design and synthesis of humidity sensitive materials with desirable *** this work,the sensing mechanism of humidity sensors based on quaternized poly(4-vinylpyridine) (PVP)/carbon black (CB) composite[1] was studied by measuring their ac impedance spectra at various humidities at room *** low humidity...

关键词： sensing mechanism poly(4-vinylpyridine) carbon black ac impedance spectra

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Passivation Mechanism of 316L Stainless Steel in Oxidizing acid Solution

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International Journal of Minerals,Metallurgy and Materials 2000年第3期14卷 204-208页

作者： Xuanyi Wang, Yinshun Wu, Lin Zhang, Baofeng Ding (Corrosion and Protection Centre, University of Science and Technology Beijing, Beijing 100083, China) Corrosion and Protection Centre University of Science and Technology Beijing Beijing 100083 China

The compositions and the chemical valence states of elements of 316L stainless steel passive film formed in the oxidizing acid solution were studied by X-ray Photoelectron Spectroscopic (XPS) analysis. The electrochemical polarization curve was measured. The passivation process in the oxidizing acid solution was studied by ac impedance technology. The results indicated that the stable compounds layer was formed on the surface of the sample and the adsorption was the main step in the nitrite solution during passivation process. The catalysis passivation mechanism was put forward according to the experimental results. During passivation process, the water molecule was adsorbed on the surface of the sample at first in the oxidizing acid solution. The oxidizer in the solution played a role as catalyst. The oxide and hydroxide, which could be changed each other and finally formed stable passive film, were generated from adsorbing intermediate under the catalytic action. The mathematical models for predicting the steady polarization curve and the ac impedance spectra at certain conditions have been obtained. The passivation mechanism of 316L stainless steel in the oxidizing acid solution can be interpreted by the catalysis passivation mechanism.

关键词： 316L stainless steel passive film XPS ac impedance spectra passivation mechanism

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