Abstract
A simple method based on screen-printed electrodes and a handheld potentiostatic device isreported for the detection of water soluble CdS quantum dots modified with glutathione.The detection method is based on the stripping of electrochemically reducedcadmium at pH 7.0 by using square wave voltammetry. Various parameters thataffect the sensitivity of the method are optimized. QD suspension volumes of20 µl and a numberof around 2 × 1011 CdS quantum dots have been able to be detected. The proposed method should be ofspecial interest for bioanalytical assays, where CdS quantum dots can be used aselectrochemical tracers.
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