Membrane multi-detachment method and environmental sensor application of anodic aluminum oxide

Abstract

The traditional anodic aluminum oxide (AAO) is fabricated from high-purity aluminum (>99 99%) at low temperature (0~10°C) which is time-consuming high-cost and many application restrictions This study discusses the feasibility of one-step anodization of 1050 aluminum alloy at room temperature combined with hybrid pulse anodization (HPA) technology to achieve a fast low-cost and high efficiency method for one-step hard anodization (HA) process The AAO prepared under the conditions of mild anodization (MA) and HA were detached by the DCA method and the HPA technique We solved the problem that voltage detachment method could not obtain a complete AAO membrane through the parameter improvement At the same time the roughness and defects of aluminum substrate after the AAO membrane detachment was studied The three-step electrochemical polishing method was developed to reduce the surface roughness and defects of the substrate so as to repeat the membrane detachment on the same substrate In theory the AAO membrane detachment mechanism of thermal dissolution and stress effect is proposed Here one-step AAO with fast and efficiency process for repetition of detaching complete AAO membranes under MA and HA conditions is proposed In addition we also investigated a large-area with low-potential AAO for sensor applications to achieve high signal intensity high response and low response-recovery time The effects of AAO structure on sensor performance is investigaed by experimental datas and theoretical formula On the other hand innovative liquid sensors and organic gas sensors are proposed for a variety of substances to enhance and expand various applications of AAO sensors

Date of Award	2020
Original language	English
Supervisor	Chen-Kuei Chung (Supervisor)