Abstract
The photopotential of several semiconductors when immersed in solution and illuminated respond to the concentration of specific ions in solution. Trends observed for alkaline ferrocyanide electrolytes in contact with illuminated CdSe and CdTe comprise a substantial negative shift of flat-band cyanide potential V fb and an increase in open circuit potential V oc with increasing concentration. Based on this increase in V oc, a one-dimensional light-addressable photoelectrochemical (LAP) sensing configuration capable of probing five distinct 2 mm 2 regions along a 1 mm × 10 mm surface area of a single n-CdSe detector is demonstrated for cyanide analysis. This permits a single sensing LAP element which can be externally illuminated in different regions to provide both spatial and temporal information on the analyte concentration. Spatial sensing is achieved without sensor movement and with fewer electrical contacts as compared with a conventional array scheme. In solution, the photopotential has a linear response to cyanide of 120 mV × log[KCN].
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