study of sodium ion selective electrodes and differential structures with anodized indium tin oxide研究钠离子选择性电极和微分结构阳极氧化铟锡氧化物.pdfVIP

Sensors 2010, 10, 1798-1809; doi:10.3390/s100301798 OPEN ACCESS sensors ISSN 1424-8220 /journal/sensors Article Study of Sodium Ion Selective Electrodes and Differential Structures with Anodized Indium Tin Oxide Jyh-Ling Lin * and Hsiang-Yi Hsu Department of Electronic Engineering, HuaFan University, No.1, Huafan Rd., Shihting Hsiang, Taipei Hsien, 223 Taiwan; E-Mail: m9626024@.tw * Author to whom correspondence should be addressed; E-Mail: cllin@.tw; Tel.: +886-24104; Fax: +886-2 Received: 23 December 2009; in revised form: 20 January 2010 / Accepted: 2 February 2010 / Published: 4 March 2010 Abstract: The objective of this work is the study and characterization of anodized indium tin oxide (anodized-ITO) as a sodium ion selective electrode and differential structures including a sodium-selective-membrane/anodized-ITO as sensor 1, an anodized-ITO membrane as the contrast sensor 2, and an ITO as the reference electrode. Anodized-ITO was fabricated by anodic oxidation at room temperature, a low cost and simple manufacture process that makes it easy to control the variation in film resistance. The anodized-ITO based on EGFET structure has good linear pH sensitivity, approximately 54.44 mV/pH from pH 2 to pH 12. The proposed sodium electrodes prepared by PVC-COOH, DOS embedding colloid, and complex Na-TFBD and ionophore B12C4, show good sensitivity at 52.48 mV/decade for 10−4 M to 1 M, an