Tunable optical properties of colloidal quantum dots in electrolytic environments.
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 extracellular and intracellular electrolytic concentrations that are present in biological systems.
Department of Bioengineering, University of Illinois, Chicago, IL 60607, USA.
D
D
Ramadurai
B
B
Kohanpour
D
D
Alexson
P
P
Shi
A
A
Sethuraman
Y
Y
Li
V
V
Saini
M
M
Dutta
M A
MA
Stroscio