Abstract
Detection of silver (I) ion with high sensitivity and selectivity is crucial for its severe effects on environment and human health. A cost-effective label free electrochemical sensor is developed to detect Ag(I) ions in aqueous medium with very low detection limit. The biosensor fabricated by Cysteine-ssDNA conjugation at the gold surface showed excellent detectability of Ag(I) at 10 pM level of concentration. The current response in square wave voltammetry varied almost linearly with the concentrations of the Ag+ ions ranges from 10 pM to 100 nM in the solution. The mechanism thus offers excellent detectability which may be applied in the development of ultrasensitive detection strategies.
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