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Sensors 2010, 10(3), 1798-1809; doi:10.3390/s100301798

Study of Sodium Ion Selective Electrodes and Differential Structures with Anodized Indium Tin Oxide

Department of Electronic Engineering, HuaFan University, No.1, Huafan Rd., Shihting Hsiang, Taipei Hsien, 223 Taiwan
Author to whom correspondence should be addressed.
Received: 23 December 2009 / Revised: 20 January 2010 / Accepted: 2 February 2010 / Published: 4 March 2010
(This article belongs to the Special Issue ISFET Sensors)
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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, and 29.96 mV/decade for 107 M to 104 M. The sodium sensitivity of the differential sodium-sensing device is 58.65 mV/decade between 10−4 M and 1 M, with a corresponding linearity of 0.998; and 19.17 mV/decade between 105 M and 104 M. View Full-Text
Keywords: anodized indium tin oxide; anodic oxidation; sodium ion; EGFET anodized indium tin oxide; anodic oxidation; sodium ion; EGFET

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Lin, J.-L.; Hsu, H.-Y. Study of Sodium Ion Selective Electrodes and Differential Structures with Anodized Indium Tin Oxide. Sensors 2010, 10, 1798-1809.

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