Formation and photoluminescence of one-dimensional SiOx dot array–ZnO nanobelt heterostructures

Abstract

We designed and successfully synthesized novel SiO x /ZnO heterostructures via one-step thermal reaction route. Orbicular SiO x dots regularly and alternately arrange in the middle of the up/down surfaces of a nanobelt to form a one-dimensional SiO x dot array, respectively, by their self-assembly. A high-resolution transmission electron microscopy study and a selected area electron diffraction pattern revealed that ZnO nanobelts are crystalline while SiO x dots are amorphous. The formation process of such heterostructure is discussed in terms of the Stranski-Krastanow growth mode of semiconductor quantum dots. Strong white luminescence was observed by bare eyes when the photoluminescence spectrum was measured.

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