本研究利用幾丁聚醣與聚丙烯酸兩種聚電解質，藉由其間的靜電庫倫力形成幾丁聚醣/聚丙烯酸錯合物。由傅立葉紅外線光譜分析確定錯合物中有NH3+與COO-鍵結。控制溶液，可製備奈米纖維以及奈米纖維孔洞結構。實驗中分別使用醋酸、己二酸、蘋果酸與琥珀酸等羧酸溶解幾丁聚醣，再與聚丙烯酸以微滴法混合後，分成兩種結構:一為懸浮溶液錯合物結構;另一為經冷凍乾燥孔洞結構。實驗發現利用己二酸溶解的幾丁聚醣溶液與聚丙烯酸錯合物在pH=3下可得到直徑50~200nm的奈米纖維；經過冷凍乾燥後可得到規則的奈米纖維孔洞結構。由X光繞射分析的峰值可知錯合物當中亦有羧酸結晶，證明結晶酸影響幾丁聚醣分子鏈伸展。另外，pH值對形貌也有影響，高pH時不利幾丁聚醣的溶解，不易與聚丙烯酸形成錯合物，無法形成規則孔洞結構。降低pH值，網絡成形。幾丁聚醣/聚丙烯酸的體積比可改變孔洞結構的形貌，於3:1比例下可得細纖維且高緻密度的結構。
　　將此奈米纖維孔洞結構應用在氨氣的氣體感測上。顯示奈米纖維所得的靈敏度大於薄膜結構者。

　　In this study, Chitosan(CS) and Poly(acrylic acid)(PAA), two polyelectrolytes, were used to fabricate complex through electrostatic force. According to FT-IR analysis, there exists NH3+ and COO- bonding in the complex. CS-PAA nanofibers and nanofibrous structure were prepared successfully by self-assembling in proper solution environments.
　　CS was dissolved in acetic acid, adipic acid, malic acid and succinic acid respectively and then blended with PAA through a modified dropping method. By utilizing adipic acid to dissolve CS and adjusting the reaction solution of pH value to 3, CS-PAA nanofibers ranging from 50 to 200nm can be formed in a suspension solution. Also, a nanofibrous structure can be formed by freeze-drying process. It consists of fibers from 50nm to 300nm in diameter and stands a 3-D order structure. The reason could be assumed as the steric structure of the adipic acid. By examining XRD pattern, the peaks of complex could be referred to those of acids which the crystallinity has effects on the chain relaxation of CS. Higher pH value of the solution results in a lower solubility of CS, and makes more difficult to form complex with PAA. When pH is at 3, nanofibers and interconnected nanofibrous structure would be formed.
　　The CS-PAA nanofibrous structure has a great potential in gas sensor which needs a large surface area. NH3 was adopted as the detected gas and AC impedance was used for signal analyses. Comparing the sensitivity between film structure and nanofibrous structure, it was found that the sensitivity factor of nanofibrous structure was larger than that of film.

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