Abstract
A novel method of sodium ion detection from aqueous solutions based on a change of optical transmittance is proposed. Tungsten oxide-coated ITO samples for selective sodium ion detection are prepared from varying concentrations of Peroxo Tungstic Oxide precursors using a simple cathodic electrodeposition method. The optical property changes were recorded in the UV-VIS-NIR range for the samples in aqueous solutions of NaCl in TRIS/DI water solvent. It was observed that transmittance increases with NaCl concentration in a particular wavelength range. A detailed material characterization was performed to support this observation and study Na+ ion diffusion-induced structural changes. The sensor deposited from Peroxo Tungstic Acid precursor of molarity 45 mM, at a cathodic potential of -0.45 V, showed a better response. The sensor exhibits good selectivity towards N+ as compared to K+ and Ca2+ ions and linear response in the range of 10 mM to 150 mM Na+. Simple construction, higher response, and selectivity make it a promising method for sodium sensing in food industries and health monitoring.
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