Optical sensing quantum dot-labeled polyacrolein particles prepared by layer-by-layer deposition technique.

Abstract

Optical sensing polymer particles with tailored semiconductor nanocrystal (QD) loading are prepared by layer-by-layer deposition technique (LbL). Polyacrolein particles of 1.2 μm diameter are used as solid support for deposition of hydrophilic CdSe/ZnS nanocrystal/polyelectrolyte multilayers formed by electrostatic interactions. The pH-dependent fluorescence of QDs and pH-dependent conformations of polyelectrolytes, which likely passivate the surface state of nanocrystals, allow a creation of both mono- and multiplex coded polymer particles with pH-dependent fluorescence intensity. Bovine serum albumin (BSA) as outermost layer makes it possible to design the optical sensing polymer particles with reversibly responded fluorescence at pH variations. The fluorescence of such polymer particles with BSA outer layer is sensitive to copper(II) ion while the fluorescence of these particles is practically insensitive to the other divalent cations (Zn(2+), Ca(2+), Ba(2+), Co(2+), Mg(2+)). The detection limit of Cu(2+) is about 15 nM. Adaptation of LbL method to prepare QD-labeled polymer particles with enhanced complexity (e.g. several types of QDs, multiple biofunctionality) is expected to open new opportunities in biotechnological applications.

DOI: 10.1016/j.jcis.2011.02.002

Cite this paper

@article{Generalova2011OpticalSQ, title={Optical sensing quantum dot-labeled polyacrolein particles prepared by layer-by-layer deposition technique.}, author={Alla N Generalova and Vladimir A Oleinikov and Margarita M Zarifullina and Ekaterina V Lankina and Svetlana V Sizova and Michail V Artemyev and Vitali P Zubov}, journal={Journal of colloid and interface science}, year={2011}, volume={357 2}, pages={265-72} }