Couples of colloidal semiconductor nanorods formed by self-limited assembly

By means of electron microscopy it is shown that two closely spaced crystalline ZnSe nanorods connected by twinning structures can form through a self-limiting self-assembly process. These colloidal nanorod couples have low photoluminescence polarization anisotropy, their composition can be changed by means of a cation-exchange approach, and could be used to investigate the electronic coupling between the individual nanorods.