Title :
Tunable optical properties of colloidal quantum dots in electrolytic environments
Author :
Ramadurai, D. ; Kohanpour, B. ; Alexson, D. ; Shi, P. ; Sethuraman, A. ; Li, Y. ; Saini, V. ; Dutta, M. ; Stroscio, M.A.
Author_Institution :
Dept. of Bioeng., Univ. of Illinois, Chicago, IL, USA
Abstract :
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.
Keywords :
II-VI semiconductors; biological techniques; cadmium compounds; cellular biophysics; colloidal crystals; electrolytes; optical tuning; semiconductor quantum dots; visible spectra; CdS; absorption spectra; absorption threshold; colloidal quantum dots; electrolyte-dependent absorption properties; electrolytic environments; extracellular electrolytic concentration; intracellular electrolytic concentration; tunable optical properties; wurtzite structured quantum dots;
Journal_Title :
Nanobiotechnology, IEE Proceedings -
DOI :
10.1049/ip-nbt:20045001
