Optically active quantum dots

Valerie Gerard; Joseph Govan; Alexander Loudon; Alexander V. Baranov; Anatoly V. Fedorov; Yurii K. Gun'ko

doi:10.1117/12.2187198

9 October 2015 Optically active quantum dots

Valerie Gerard, Joseph Govan, Alexander Loudon, Alexander V. Baranov, Anatoly V. Fedorov, Yurii K. Gun'ko

Proceedings Volume 9545, Nanophotonic Materials XII; 95450N (2015) https://doi.org/10.1117/12.2187198
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

The main goal of our research is to develop new types of technologically important optically active quantum dot (QD) based materials, study their properties and explore their biological applications. For the first time chiral II-VI QDs have been prepared by us using microwave induced heating with the racemic (Rac), D- and L-enantiomeric forms of penicillamine as stabilisers. Circular dichroism (CD) studies of these QDs have shown that D- and L-penicillamine stabilised particles produced mirror image CD spectra, while the particles prepared with a Rac mixture showed only a weak signal. It was also demonstrated that these QDs show very broad emission bands between 400 and 700 nm due to defects or trap states on the surfaces of the nanocrystals. These QDs have demonstrated highly specific chiral recognition of various biological species including aminoacids. The utilisation of chiral stabilisers also allowed the preparation of new water soluble white emitting CdS nano-tetrapods, which demonstrated circular dichroism in the band-edge region of the spectrum. Biological testing of chiral CdS nanotetrapods displayed a chiral bias for an uptake of the D- penicillamine stabilised nano-tetrapods by cancer cells. It is expected that this research will open new horizons in the chemistry of chiral nanomaterials and their application in nanobiotechnology, medicine and optical chemo- and bio-sensing.

Conference Presentation

Citation Download Citation

Valerie Gerard, Joseph Govan, Alexander Loudon, Alexander V. Baranov, Anatoly V. Fedorov, and Yurii K. Gun'ko "Optically active quantum dots", Proc. SPIE 9545, Nanophotonic Materials XII, 95450N (9 October 2015); https://doi.org/10.1117/12.2187198

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