In-Situ Synthesis of Conducting Polymer Composite Film as a CO2 Gas Sensor
碩士 === 國立臺灣大學 === 化學工程學研究所 === 99 === In this Study, 3,4-ethylenedioxythiophene (EDOT) was oxidatively polymerized via in-situ polymerization and then fabricated a branched polyethylenimine (BPEI) film on PEDOT by drop casting. The PEDOT-BPEI sensing film which deposited on a gold interdigitated ele...
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| Other Authors: | |
| Format: | Others |
| Language: | en_US |
| Published: |
2011
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| Online Access: | http://ndltd.ncl.edu.tw/handle/34463735601851269774 |
| Summary: | 碩士 === 國立臺灣大學 === 化學工程學研究所 === 99 === In this Study, 3,4-ethylenedioxythiophene (EDOT) was oxidatively polymerized via in-situ polymerization and then fabricated a branched polyethylenimine (BPEI) film on PEDOT by drop casting. The PEDOT-BPEI sensing film which deposited on a gold interdigitated electrode was used as a resistive type carbon dioxide gas sensor. There is no response of the sensor when the sensing film is only a PEDOT monolayer. With adding BPEI, the response to expose to 1000 ppm carbon dioxide increased from nearly none to a value of 3.25％ and the response increased with the increasing amount of BPEI. The response curves of PEDOT-BPEI sensing film could be fitted well with single term of exponential expression. The sensor exhibited linear response behavior to carbon dioxide gas at higher concentration (750-5500 ppm). The limit of detection was 97 ppm (signal/noise = 3). The response time (t90) and recovery time (t90) were recorded to be 1264 s and nearly 1 hour, respectively. In the temperature and humidity tests, it could be observed that the optimum operation condition is room temperature and high relative humidity (RH). The reusability test showed that no obvious decay in response for repeatedly (three times) measurements. The long recovery time of nearly 1 hr was shortened to approximately 10 min by heating the sensor during recovery.
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