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研究生:李慶榮
研究生(外文):Lee, Ching-Zung
論文名稱:聚咇咯/聚乙烯醇複合膜對氣體感測之特性研究
論文名稱(外文):Characterization of Polypyrrole/Poly(Vinyl-alcohol) Composite Films for Gas Sensing
指導教授:林智汶, 黃炳照
指導教授(外文):Lin Chi-Wen, Hwang Bing-Joe
學位類別:碩士
校院名稱:國立台灣工業技術學院
系所名稱:化學工程技術研究所
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:1997
畢業學年度:85
語文別:中文
論文頁數:331
中文關鍵詞:聚咇咯聚乙烯醇甲醇乙醇氨氣氣體感測器
外文關鍵詞:PPyPVAMethanolEthanolAmmoniaGas Sensor
相關次數:
  • 被引用被引用:1
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本研究是以複合膜為感測薄膜分別對甲醇、乙醇氣体及氨氣作感測,藉由
材料之改質來改善其感測特性。主要包括(一)PPy及PPy/PVA複合膜之物
性,(二)PPy及PPy/PVA複合膜對氣体偵測特性,(三)PPy及PPy/PVA複
合膜對氣体感測之動力分析。由實驗結果顯示,化學氣相法聚合之PPy/
PVA複合膜中Pyrrole的含量隨預塗層中的氧化劑含量之增加而增加。由
TGA分析,其熱裂解溫度比純PPy及純PVA來的低,此乃由於加入之 Fe3+會
促進脫水(Dehydration)反應所致。它對甲醇氣体的偵測,所需之應答、
回復時間 較長,此可能與其表面型態甚為緻密及攙雜陰離子有關。由電
化學共聚法製備之PPy/PVA複合膜,膜中PVA含量隨溶液中PVA含量的增加
而增加。由 TGA分析顯示,可能由於氫鍵的作用使其熱重損失較PPy緩和
。PPy/PVA複合膜對氣体偵測 之感度較純PPy膜來得大,並且隨溶液中PVA
含量之增加而增加,而且同一含量下,薄膜聚合電量愈大其感度愈低。其
中以0.75g/100mL PVA及50mC所得複合膜之感度最大。對於不 同氣体之感
度大小次序為氨氣>甲醇>乙醇。由動力模式得知,薄膜感度與膜厚成反比
,與分子電阻之變化(r1-r0)及活性基數目(m)成正比。應答時間與吸附速
率及濃度成反比。而其單位活性基電阻變化量m(r1-r0)/n隨PVA 含量增加
而增加,且隨膜厚增加而減少。PVA含量增加會導致活性位置數目減少,
亦會增 加膜厚,故感度增加的因素可能為PVA分子會使活性基之活性增加
所致。老化實驗結果顯 示PPy膜對醇類之老化程度較PPy/PVA膜緩和,而
對氨氣則先下降而後達一穩定值,顯示此種複合膜較適於氨氣之感測。
The gases of methanol, ethanol and ammonia were detected by the
PPy films modified by PVA to improve its sensing
characterization. The material properties, the gas
sensing characterizations and the gas sensing kinetics of the
PPy and PPy/PVA composite films were investigated in this study.
The results indicated that increasing the concentration of
oxidant (Fe3+) leads to increase the content of PPy in the
PPy/PVA composite films prepared by chemical vapor deposition.
The thermal cracking temperature of PPy/PVA is lower than that
of pure PPy and pure PVA. It is probably due to the fact that
the dehydration reaction in the PPy/PVA is enhanced by the
oxidant ion (Fe3+). The compact films doped with Cl- ion could
result in the long response and recovery time for methanol
sensing. The content of PVA within the composite films prepared
by electropolymerizati-on increases with an increase in the
loading of PVA in the solution. Decreasing the weight loss of
PPy is probably due to the hydrogen bonding between PPy and
PVA. The gas sensitivity of PPy/PVA composite films more
increases than pure PPy films and increases with increasing
the content of PVA. At the same content of PVA, the gas
sensitivity decreases with the charge applied for ele-
ctropolymerization. The maximum sensitivity was obtained on the
composite film prepared at 0.75g/100ml PVA and 50 mC. The
sequence of sensitivity for the different gas is ammonia >
methanol > ethanol.The gas sensitivity inverses to the thickness
of films (n) but is proportional to the number of active sites
(m) and the change of molecular resistance (r1-r0). The
response time inverse to the rate constant of absorption and the
gas concentration. The change of resistance per active site
increases with increasing the content of PVA. Increasing the
content of PVA leads to decrease the number of active
sites and increase the thickness of films. Ther-efore,
increasing the gas sensitivity is supposed to result from the
increase of site activity. The aging rate for alcohol sensing on
PPy films is lower than that on PPy/PVA. However, PPy/PVA
films become stable after aging test. It indicates that the
PPy/PVA composite films are suitable to be used as an ammonia
sensor.
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