本研究使用層接式共價鍵結法固定甲基丙烯酸甲酯(MMA) 及甲基丙烯醯胺基丙基三甲基銨氯化物(MAPTAC) 所共聚合之poly-MMA-MAPTAC之共聚物於聚酯(PET)塑膠基板上製備可撓式濕度感測元件。並利用電化學阻抗式頻譜分析儀(EIS)、傅立葉轉換紅外光譜儀(FTIR)分析poly-MMA-MAPTAC之共聚物層接式共價鍵結法固定在塑膠基板上特徵特性。將探討添加1-乙基-3-（3-二甲基氨基丙基）碳二亞胺 (EDC；peptide偶合劑)對將poly-MMA-MAPTAC層接式共價鍵結法固定於塑膠基板上所製成的可撓式濕度感測器的耐水性、感濕範圍、可撓性與長期穩定度。利用層接式共價鍵結法製備的poly-MMA-MAPTAC可撓式濕度感測元件具有感濕範圍廣泛、低濕滯現象、反應快速、可撓性高、耐水性高、長期穩定性佳、製備簡單等優點。
Novel flexible impedance-type humidity sensors were fabricated by anchoring humidity-sensitive polyelectrolyte to the gold electrode on plastic substrates using a peptide chemical protocol.
A pair of comb-like Au electrodes on a polyester (PET) substrate was pretreated with 3- mercaptopropionic acid (MPA) and further reacted with a copolymer of methyl methacrylate (MMA) and [3-(methacrylamino)propyl] trimethyl ammonium chloride (MAPTAC) using N-(3-dimethylaminopropyl)-N’-ethylcarbodiimide hydrochloride (EDC) as peptide coupling reagent. The prepared humidity-sensing film was characterized by electrochemical impedance spectroscopy (EIS) and Fourier transform infrared spectroscopy (FTIR). The amount of added EDC influenced the stability of the anchored poly-MMA-MAPTAC onto the MPA/Au surface in water.
The flexible impedance-type humidity sensor made of poly-MMA-MAPTAC that was anchored onto the MPA/Au surface using 200 mM added EDC had a wide working range of humidities, a high sensitivity, an acceptable linearity, a small hysteresis, high flexibility, a short response time, a weak dependence on temperature and good long-term stability. The dependence of the impedance on frequency was greater at lower RH.
