Toward Linear Arrays of Quantum Dots via Polymer Nanofibers and Nanorods

Abstract

Linear arrays of quantum dots are predicted to show localization effects for light traveling along the linear dimension quite similar to the case of the Anderson localization phenomenon known for electron transport. A basic requirement is to have stable arrays of such quantum dots at hand that might be incorporated into potential devices. To prepare such linear arrays, we dispersed ZnSe quantum dots in a polymer solution and used this solution in a first approach to electrospin polymer nanofibers from this solution using polystyrene and polylactide as polymer matrix. Nanofibers with quantum dots with dimensions ranging from several 100 nm to about 10 nm were achieved in this way. Using frame type and cylindrical rotating electrodes, an enhanced mutual orientation of these fibers was achieved. In a second approach, we used the wetting assisted template approach based on porous alumina templates to obtain parallel sets of polystyrene nanorods containing quantum dots.