Solution-Based Cupric Ion Doped Polyaniline Emeraldine Salt for Hydrogen Sulfide Sensor
Date Issued
2016
Date
2016
Author(s)
Weng, Yu-Kai
Abstract
In this thesis, an organic electronic element is fabricated by semiconductor manufacturing process combining with solution process of conducting polymer.Polyaniline (Emeraldine Salt) was chosen for polymer matrix, then doping with copper nitrate as sensing material formed a chemiresisive gas sensor. Drop casting the composite between the gold electrodes achieves fast fabrication, low cost, and nontoxicity which is either safe for human or environmental friendly comparing to other doping salts of polyaniline. With copper ions can improve sensitivity significantly. The detection range targets at above 3 ppm H2S which can do damage to human body. On exposure to 5 ppm H2S, the decrease of resistance is up to 20 % in 5 minutes. The sensing element can be operated at room temperature with the linear response from 3 to 15 ppm range and suitable for discriminating concentration in different relative humidity. Sensors selectivity is higher than carbon monoxide, carbon dioxide, and ethylene. A decrease of conductivity was observed when injecting nitrogen dioxide. In addition, in the condition which the humidity individually exists and participates in the response of the sensor was discussed. By means of adding additional humidity sensor which can more accurately determinate H2S and solve the disadvantage of conducting polymer which is often sensitive to humidity. In the final section, the sensing mechanism was verified by material analysis including Raman spectroscopy, UV-VIS, polarizing microscopy and XRD.
Subjects
Organic electronic devices
chemiresistive hydrogen sulfide sensors
conducting polymer
polyaniline emeraldine salt/copper nitrate composite
solution process
drop casting
Type
thesis
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