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Fabrication and Electrical Properties of Anodic Aluminum Oxide Membrane with Various Anodizing Temperatures for Biosensor

바이오센서로 응용을 위한 양극산화알루미늄의 양극산화 온도에 따른 제작 및 전기적 특성

  • Yeo, Jin-Ho (Department of Ceramic Engineering, Gyeongsang National University) ;
  • Lee, Sung-Gap (Department of Ceramic Engineering, Gyeongsang National University) ;
  • Kim, Yong-Jun (Department of Ceramic Engineering, Gyeongsang National University) ;
  • Lee, Young-Hee (Department of Electronic Materials Engineering, Kwangwoon University)
  • 여진호 (경상대학교 세라믹공학과) ;
  • 이성갑 (경상대학교 세라믹공학과) ;
  • 김용준 (경상대학교 세라믹공학과) ;
  • 이영희 (광운대학교 전자재료공학과)
  • Received : 2013.07.29
  • Accepted : 2014.05.03
  • Published : 2014.06.01

Abstract

We fabricated the electrolyte-dielectric-metal (EDM) sensor on the base of AAO (anodic aluminum oxide) template with variation of the anodizing temperature. When a surface is immersed or created in an aqueous solution, a discontinuity is formed at the interface where such physicochemical variables as electrical potential and electrolyte concentration change significantly from the aqueous phase to another phase. Because of the different chemical potentials between the two phases, charge separation often occurs at the interfacial region [1]. This interfacial region, togeter with the charged surface, is usually known as the electrical double layer (EDL) [2]. The structural and electrochemical properties of AAO sensor were investigated for applications in capacitive pH sensors. To change the thickness of the AAO template, the anodizing temperature was varied from $5^{\circ}C$ to $20^{\circ}C$, the thickness of the AAO template invreased from 300 nm to 477 nm. The pH sensitivity of sensors with the anodizing temperature of $20^{\circ}C$ showed the highest value of 56.4 mV/pH in the pH range of 3 to 11. The EDM sensor with the anodizing temperature of $20^{\circ}C$ exhibited the best long-term stability of 0.037 mV/h.

Keywords

Acknowledgement

Supported by : 한국연구재단

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