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

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

*  and
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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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, 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.
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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