The absorption spectra of colloidal cadmium sulfide quantum dots in electrolytic solutions are found to manifest a shift in the absorption threshold as the concentration of the electrolyte is varied. These results are consistent with a shift in the absorption threshold that would be caused by electrolytic screening of the field caused by the intrinsic spontaneous polarisation of these würtzite structured quantum dots. These electrolyte-dependent absorption properties provide a potential means of gaining insights on the variable extracellural and intracellular electrolytic concentrations that are present in biological systems.
Published in:
Nanobiotechnology, IEE Proceedings -
(Volume:151
,
Issue:
6
)
Date of Publication: 2 Dec. 2004