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Dielectric Properties of capacitive-type Humidity Sensor Made under Different Pressures

稀有金属材料与工程 2006年第A03期35卷 366-368页

作者： Jing Wang Xiao-hua Wang School of Electron and Information Engineering Dalian University of Technology Dalian 116023 China Department of Computer Science and Information Shanghai University of Electric Power Shanghai 200090 China

capacitive humidity sensors were made of nanometer barium *** pellets were prepared under different pressures between 3920N to 7850N *** capacitance changes in three orders of magnitude in the relative humidity range of 10%～98%,indicating high humidity sensitivity of the *** a certain measuring frequency,the capacitance of the sensors increases as increasing of the preparation pressure,while the sensitivity of the sensors basically remains the *** frequencies corresponding to the peaks of the dielectric loss of the sensors move to the higher frequency direction as increasing of the relative *** a certain humidity,the frequencies corresponding to the peaks of the dielectric loss move to the higher frequency direction as increasing of the preparation pressure.

关键词： humidity sensor capacitive-type preparation pressure humidity sensing property

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Dielectric Properties of capacitive-type Humidity Sensor Made under Different Pressures

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稀有金属材料与工程 2006年第S3期 366-368页

作者： Jing Wang~1 Xiao-hua Wang~2 (1.School of Electron and Information Engineering,Dalian University of Technology,Dalian 116023,China) (2.Department of Computer Science and Information,Shanghai University of Electric Power,Shanghai 200090,China)

关键词： humidity sensor capacitive-type preparation pressure humidity sensing property

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PREPARATION AND CHARACTERIZATION OF HUMIDITY SENSOR BASED ON POLY(3-ALKYL)PYRROLE CONTAINING PHOSPHONIC ACID GROUPS

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Chinese Journal of Polymer Science 2013年第10期31卷 1443-1450页

作者： Xue-diao Cai Ru Huang Ya-nan Guo Key Laboratory of Macromolecular Science of Shaanxi Province School of Chemistry and Chemical EngineeringShaanxi Normal University

Poly（3-alkyl）pyrroles containing phosphonic acid groups with different alkyl segment lengths were chemical synthesized and the properties were measured by FTIR and UV-Vis spectroscopy. FTIR and UV-Vis results showed that the synthesized polymers were in a low doping level through chemical polymerization. By spin-coating on the surface of substrates, the polymer can be used as a humidity sensor. The change of DC electric current of the polypyrroles varies with the chain length of the alkyl substituents. The capacitance increases with the increase of the humidity and resistance decreases with the increase of humidity. This result is different from that ofpolypyrrole without alkyl substituents due to the influence of the phosphonic acid group. The sensor showed the resistive-type at high relative humidity, and the capacitive- type at the low relative humidity. The sensor exhibited very fast response to the change of environment humidity.

关键词： Poly(3-alkyl)pyrrole Humidity sensor Phosphonic acid group capacitive-type Resistive-type.

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