- 期刊
金屬模具高壓鑄造法製備氨氣奈米線感測元件
Preparation of a Nanowire Ammonia Gas Sensor by a High Pressure Casting Method
摘要
肝病是台灣的十大死因之一，以往進行肝功能檢測必須透過抽血檢驗各項數值，是一種侵入式的檢測。本研究試圖利用陣列式陽極氧化鋁模板製備奈米線元件，發展非侵入式檢測技術以製造有機氨氣氣體感測器，讓病人能自我監控。根據文獻顯示，有肝臟疾病的患者與一般健康的人相較之下，其呼出的氣體中所含的氨濃度是不同的，因此本研究希望利用氨氣的檢測，能夠盡早對於肝病患者的健康狀況提出預警。本研究為結合傳統之鑄造技術與先進之奈米技術，經陽極氧化過後的AAO(anodic aluminum oxide)模板為陣列式奈米孔洞結構，再以真空熔煉600°C製備出高純度之鋅金屬，接著利用金屬模具高壓鑄造法製作鋅金屬奈米線。將AAO模板與鋅金屬薄片置於自製模具中，並抽真空至10^(-3) torr，加熱至800°C，持溫30分鐘後，使鋅金屬融化且覆蓋於AAO表面。隨後再施以壓力800 kg/cm^2，使鋅金屬進入奈米管管徑80 nm內。最後再將AAO去除並將其氧化，製成氧化鋅奈米陣列。本研究之重點為氨氣奈米線感測元件的開發，由於有機氣體感測器有較優的單一選擇性，因此選擇開發方向為有機氣體感測器。首先使用高壓鑄造法製作陣列式氧化鋅(Zinc Oxide，ZnO)奈米線，並搭配塗佈聚三己基噻吩(Poly(3-hexylthiophene)，P3HT)，而得到結構簡單、靈敏性佳以及高穩定性的氨氣奈米線感測元件。
並列摘要
Liver disease is the ninth leading cause of death in Taiwan. An invasive test was developed to examine the function of the liver which was usually testing through the blood examination. The purpose of the research was using the anodic aluminum oxide film to prepare the nanowire gas sensor. According to the literature, the ammonia concentration in the exhaled gas of patients was different from the healthy people. An ammonia gas sensor could help the patients to do the self-monitoring of the ammonia concentration, and get the early warning for liver diseases. This research was combining the traditional casting technology and advanced nano-technology. AAO template was a nanoporous structure after anodization. A high purity zinc metal was prepared at 600 °C by a vacuum melting method. AAO template and the high purity zinc metal were placed into the mold and then heated to 800 °C for 30 minutes. The zinc melt would cover the nanopores of the AAO template and was injected into the nanopores by applying a normal pressure of 800 kg/cm^2. After that, zinc nanowires were formed in the nanopores of AAO template. After removing the AAO template and oxidizing of the zinc nanowires, zinc oxide (ZnO) nanowires could be obtained. An organic gas sensor produced in this work was composed of P3HT (Poly(3-hexylthiophene)) and ZnO nanowires. P3HT film was coated on the surface of ZnO nanowires by a spin coating technique. The organic sensing material, P3HT, was chosen due to its high selectivity and sensitivity to the ammonia gas. In this study, an ammonia gas sensor was fabricated successfully and had some advantages such as simple configuration, high stability, and good sensitivity.