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研究生:王超聖
研究生(外文):Chao-Shen Wang
論文名稱:聚甲基丙烯酸甲酯/奈米碳管之奈米複合濕度材料及可撓式濕度感測器
論文名稱(外文):PMMA/CNTs nanocomposite humidity sensing materials and flexible humidity sensors
指導教授:蘇平貴蘇平貴引用關係
指導教授(外文):Pi-Guey Su
學位類別:碩士
校院名稱:中國文化大學
系所名稱:應用化學研究所
學門:自然科學學門
學類:化學學類
論文種類:學術論文
論文出版年:2007
畢業學年度:95
語文別:中文
論文頁數:115
中文關鍵詞:濕度感測器奈米複合材料感濕特性可撓式共聚合反應
外文關鍵詞:Humidity sensorNanocomposite materialHumidity sensingFlexibleco-polymerizationSubstrate effect
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本研究探討奈米複合材料應用於濕度感測器及可撓式濕度感測器之兩個主題。
(一) 奈米複合濕度感測器
本研究以奈米複合材料來製作電阻式之濕度感測器,將甲基丙烯酸甲脂(methyl methacrylate, MMA)添加多壁奈米碳管(multi-walled carbon nanotubes, MWCNTs)、乙醇(ethanol, EtOH)、氫氧化鉀(potassium hydroxide, KOH)及偶氮異二丁腈(azobisisobutyronitrile, AIBN)做為奈米複合濕度材料,之後再利用旋轉塗佈法將此感測材料塗佈於印有一對梳狀電極的氧化鋁基板,經由70 ℃之6 小時熱聚合後製得所要的濕度感測元件。第二段本研究中探討MWCNTs添加量對PMMA/MWCNTs奈米複合材料之電性及感濕特性的影響,同時藉由添加KOH來增加PMMA/MWCNTs奈米複合材料感濕感度及線性。其後並利用紅外線光譜儀(FT-IR)、掃描式電子顯微鏡(SEM)以及能量散佈光儀(EDS)分析PMMA/MWCNTs/KOH奈米複合材料的結構與表面特性。

(二) 可撓式濕度感測器
在本篇論文中,以甲基丙烯酸甲脂(methyl methacrylate, MMA)添加3-甲基丙烯醯胺基丙基三甲基氯化銨( 3-(methacrylamino)propyl trimethyl ammonium chloride, MAPTAC )共聚合後於塑膠基板(polyester substrate)上塗佈而製得。將比較塑膠以及氧化鋁濕度感測元件之感濕特性上的差異。說明不同種類的基板所製作的濕度感測器具有不同的感濕特性。
可撓式濕度感測器於25 ℃、交流電壓1 V及交流阻抗1k Hz 的條件下感應線性(Y = -0.0327X + 5.9345; R2 = 0.9351)以阻抗(log Z)與相對濕度在10 %~90 % RH範圍所呈現,平均遲滯量也在1.85 % RH 之內、良好的反應時間(45 秒)及回覆時間(150 秒)與120 天的長期穩定測試。
This research discusses second separately the various subjects nanocomposite materials for humidity sensors application and flexible humidity sensor based on copolymer.
First section: Nanocomposite materials for humidity sensors application
In this study resistance type humidity sensors was fabricated by using nanocomposite materials. The methyl methacrylate(MMA) added with multi-walled carbon nanotubes(MWCNTs), ethanol(EtOH), potassium hydroxide(KOH) and azobisisobutyronitrile(AIBN) were used as the precursor solution of nanocomposite materials for humidity sensors application. The solution of nanocomposite materials were spin-coated on an alumina substrate with a pair of comb-like golden electrodes and then synthesized at 70 ℃ for 6 h in air for copolymerization, the humidity sensors were obtained. The thin films were analyzed by scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and Fourier transform infrared spectroscopy (FT-IR). We discussed the effect of amount of MWCNTs on electrical and humidity properties. Moreover, the KOH was added into PMMA/MWCNTs nanocomposite materials to increase sensitivity and linearity.
0.024 g MWCNTs and 0.01 ml of 10% KOH had better humidity sensing properties. Such as good linearity and sensitivity, fast response and recovery time, low hysteresis and stability.

Second section: Flexible humidity sensors based on copolymer
A novel flexible resistive-type humidity sensor was fabricated through in situ co-polymerization of methyl methacrylate (MMA) and [3-(methacrylamino)propyl] trimethyl ammonium chloride(MAPTAC) copolymer on a polyester (PET) substrate. The activation energy for conduction and the copolymer/substrate interface were used to explain the differences of humidity sensing characteristics of the sensors fabricated on a PET substrate, in comparison with those fabricated on an alumina substrate. The humidity sensing characteristics of the flexible humidity sensor could be comparable with the sensor fabricated on an alumina substrate.
The flexible humidity sensor showed acceptable linearity (Y = -0.0327X + 5.9345; R2 = 0.9351) between logarithmic impedance (log Z) and RH in the range of 10-90%RH, average hysteresis (within 1.85%RH), good response (45 s) and recovery time (150 s), and long-term stability (120 days at least), measured at 1V, 1 kHz and 25 ℃.
第一章 序論 1
1-1 濕度介紹與偵測重要性 1
1-2 濕度感測器介紹 3
第二章 理論說明與文獻回顧 4
2-1 濕度的表示法 4
2-2 各類型濕度感測器 6
2-2-1 毛髮濕度計(Hair Hygrometer) 6
2-2-2 乾濕球溫度計( Psychrometers ) 7
2-2-3 重力式濕度計(Gravitometer Hygrometers) 7
2-2-4 紅外線濕度計
(Infrared Absorption Hygrometer) 7
2-2-5 電解質濕度感測器
(Electrical Conductivity Sensors) 7
2-2-6 高分子濕度感測器 8
2-3 濕度感測材料 12
2-3-1 陶瓷材料 12
2-3-2 高分子材料 13
2-3-3 奈米複合材料 14
2-4 研究目的 16
第三章 實驗方法與分析 17
3-1 實驗藥品 17
3-2 實驗設備與儀器 18
3-3 實驗流程與步驟 19
3-3-1 基板製備 19
3-3-2 PMMA/MWCNTs/KOH複合濕度材料及感測層製備 19
3-3-3 MMA/MAPTAC複合濕度材料、感測層及原件製備 20
3-3-4 紅外線光譜儀(FT-IR)分析 20
3-3-5 掃描式顯微鏡觀察及能量散佈光儀分析 20
3-3-6 電性量測 20
第四章 PMMA/MWCNTs/KOH 結果與討論 22
4-1 奈米複合材料之共聚合探討 22
4-1-1 PMMA/MWCNTs的結構分析 22
4-1-2 PMMA/MWCNTs奈米複合材料的表面結構分析 23
4-1-3 MWCNTs對PMMA/MWCNTs奈米複合材料的電性影響 23
4-1-4 膜厚對濕度感測特性之影響 25
4-1-5 MWCNTs添加量對PMMA/MWCNTs
奈米複合材料之感濕及電性影響 25
4-2 KOH添加對PMMA/MWCNTs奈米複合材料之感濕特性探討 28
4-2-1 PMMA/與PMMA/MWCNTs/KOH之能量散佈分析儀分析 28
4-2-2 PMMA/MWCNTs/KOH奈米複合材料之感濕及電性探討 28
4-3 PMMA/MWCNTs/KOH奈米複合材料之基本感濕特性探討 30
4-3-1 感應線性及遲滯效應探討 30
4-3-2 反應及回覆時間 30
4-4 結果與討論 31
第五章 可撓式濕度感測器結果與討論 32
5-1 MMA/MAPTAC共聚合物之共聚合條件探討 32
5-1-1 MMA/MAPTAC聚合時間的探討 32
5-1-2 MAPTAC的添加量對濕度感應特性的影響 32
5-2 氧化鋁基板及塑膠基板之感濕特性探討 33
5-2-1 外加頻率影響濕度感應特性之探討 33
5-2-2 外加電壓影響濕度感應特性之探討 34
5-2-3 溫度係數之探討 34
5-2-4 活化能的探討 34
5-3 可撓式濕度感測器之基本感濕特性探討 36
5-3-1 感應線性 36
5-3-2 濕滯效應探討 36
5-3-3 反應時間與回覆時間 36
5-3-4 長期穩定探討 37
5-4 結果與討論 37
結論 38
參考文獻 40
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