title: Study of sodium ion selective electrodes and differential structures with anodized indium tin oxide.
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 10(-7) M to 10(-4) 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 10(-5) M and 10(-4) M.
authors.affiliation: Department of Electronic Engineering, HuaFan University, No.1, Huafan Rd., Shihting Hsiang, Taipei Hsien, 223 Taiwan. cllin@huafan.hfu.edu.tw
authors.forename: Jyh-Ling
authors.initials: JL
authors.lastname: Lin
authors.forename: Hsiang-Yi
authors.initials: HY
authors.lastname: Hsu
mesh_terms: D055664:Electrochemical Techniques / Q000295:instrumentation; D004867:Equipment Design; D006863:Hydrogen-Ion Concentration; D017736:Ion-Selective Electrodes; D016014:Linear Models; D008567:Membranes, Artificial; D010084:Oxidation-Reduction; D012964:Sodium / Q000032:analysis / Q000737:chemistry*; D017971:Tin Compounds / Q000737:chemistry*; D014173:Transistors, Electronic
chemical_list: D008567:Membranes, Artificial; D017971:Tin Compounds; C109984:indium tin oxide; D012964:Sodium