本研究使用二十碳酸為促進劑，以不同比例加入在氣液界面鋅紫質(5,10,15,20 - Tetraphenyl- 21H,23H-porphine zinc，ZnTPP)單分子層中，探討促進劑對ZnTPP單分子穩定性之影響，並以Langmuir –Blodgett (LB)沉積技術，將沉積所得ZnTPP 多層LB膜應用於光學氣體感測。
ZnTPP分子結構因無明顯親水端，不容易沈積成LB膜。我們發現，藉由基板之改質及加入促進劑，可以改善沈積行為。利用原子力顯微鏡觀察，發現加入二十碳酸，使得薄膜的高低起伏變低，亦可改善分子聚集現象。當二十碳酸添加比例在50mol%且在改質基板上沈積，可得到品質良好之Y型ZnTPP LB膜。但添加比例在20mol%時，發現薄膜表面形成方形分子之聚集。
ZnTPP 多層LB膜應用於光學胺類氣體感測方面，當感測胺類分子之碳鏈越長，其推電子能力越強，故N原子上電荷密度越高，使得和中間金屬作用力強，因此吸收度變化變大；相反的吸附分子若為拉電子基團，吸收度變化較小。
對於不同級數之己胺異構物，以n-Hexylamine吸收度變化最大，而Dipropylamine及Triethylamine由於烷基支鏈的立體障礙影響，吸收度變化較小及應答較慢。
乙二胺分子因為擁有兩對未共用電子對，使得與ZnTPP之中間金屬鋅有效碰撞頻率變高，因此，應答快。在戊胺異構物中，吸收度變化大小為n-Amylamine＞iso-Amylamine＞tert-Amylamine，主要為立體障礙之影響。
在不同層數感測甲胺氣體時，ZnTPP LB單層薄膜對甲胺之感測行為不可逆。隨著層數的增加，應答速率變慢，但其感測行為變為可逆。在單層不同沉積膜壓時，當沉積膜壓越高時，對甲胺感測應答越快。而二十碳酸的加入，隨著添加比例增加使得ZnTPP LB多層膜之感測應答變快。

The effect of arachidic acid (AA) promoter on the stability of zinc tetraphenylporphyrin (ZnTPP) monolayer on gas-liquid interface was investigated. Langmuir-Blodgett (LB) technique was also employed to deposit thin films for gas sensing studies.
ZnTPP molecules do not possess amphiphilic characteristics required for forming stable LB monolayer by themselves. We found that both surface modification of the glass substrate and addition of the AA promoter molecules can improve the monolayer formation and the deposition quality of the ZnTPP/AA mixed LB films. Based on the morphology analysis by atomic force microscopy, it was found that aggregation phenomenon in the ZnTPP LB film became lessened when AA was added. Good Y-type multilayer LB films can be deposited on hydrophobic silanized-glass substrates with the addition of 50 mol% AA to ZnTPP. With the addition of 20 mol% of arachidic acid, some square-shaped aggregates were observed in the LB film. Further investigations are needed to elucidate the nature of the unusual square-shaped aggregates.
ZnTPP multilayer LB films were employed as optical amine-gas sensors. We found that the sensitivity increases with the alkyl chain length of the amine, due to its electron-releasing power. The variation in absorbance is the largest for n-hexylamine, less for n-Amylamine and the least for n-butylamine.
We also found that the sensitivity is the largest for n-hexylamine (primary), less for dipropylamine (secondary), and the least for triethylamine (tertiary), due the steric hindrance.
For Amylamine isomers, the order is n-Amylamine＞iso-Amylamine＞tert- Amylamine, also due to the steric-hindrance effect.
The response speed of the single layer ZnTPP film towards methylamine increases with higher deposition surface pressure, but decreases with the increase of the number of LB layers. The adsorption behavior is irreversible for the single layer LB film, but becomes more reversible for multilayer films. The response speed increases with the addition of arachidic acid to the LB film.

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