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.

Pyrrole coupling chemistry: investigation of electroanalytic, spectroscopic and thermal properties of N-substituted poly(bis-pyrrole) films

“…[24][25][26][27][28][29] Also, carbon paste electrode modified with layered birnessite-type manganese oxide and anodized indium tin oxide electrode were lastly tested. 30,31 Simple and efficient sensors towards Na + is still needed, thus polymeric P1 type film was constructed for the detection of sodium ions using with cyclic voltammetry. The complexing properties of P1 towards alkali cations (Li + , Na + and K + ) was investigated in an acetonitrile medium, in which P1 was grown by passing a total charge of 100 mC cm 22 at 1.1 V. Changes in the voltammogram of the polymer film were monitored during the addition of a small amount of cations to a monomer-free electrolytic solution.…”

Tin(II) Selective PVC Membrane Electrode Based on Salicylaldehyde Thiosemicarbazone as an Ionophore

“…It is well known [14,15] that sensitivity and selectivity obtained for a given ionophore is signi�cantly affected by the membrane composition of an ion sensor membrane. e different membrane ingredients, such as amount of ionophore and nature of the plasticizer and additives, in�uence the potentiometric response behaviour of the sensor [16,17]. Best optimized studies membrane for Sn 2+ selective electrode are reported in Table 2 sensor 2.…”

Instant Mercury Ion Detection in Industrial Waste Water with a Microchip Using Extended Gate Field-Effect Transistors and a Portable Device

“…For a traditional Hg ISE, the limit of detection limit is 10 −8 M [15,16] while we are able to detect lower concentrations of up to 10 −13 M, eliminating the need for a reference electrode [17,18,19]. The field effect transistor has various advantages such as quick measurement, a simple electrical signal read out and elevated sensitivity [20,21,22]. In this research we have developed a device with a simple user interface and a very short response time (within five minutes) that can extrapolate the concentration of mercury ions in a blind test solution.…”