Alignment of Colloidal CdS Nanowires Embedded in Polymer Nanofibers by Electrospinning

摘要

Semiconductor nanocrystals(NCs)exhibit size-controlled spectral tunability and chemical flexibility,making them attractive materials for use in new and emerging applications,such as fluorescent tagging,lasing,light-emitting diodes and nanoelectronics.One-dimensional quantum wires(QWs)and quantum rods(QRs)have become a class of attractive materials as their dimensional anisotropic behaviour gives rise to unique physical properties;for example,recent observations of CdSe QRs showed a non-monotonic change of the fluorescence Stokes shift with an increase in the aspect ratio(length/ width),exhibiting a linearly polarized photoluminescence.Semi-empirical pseudo-potential calculations of CdSe rods predicted a crossover of the electronic states at a certain aspect ratio,leading to a transition from plane-polarized to linearly polarized light emission.