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Semiconducting Nanobelts of ZnO and ZnS

Semiconducting oxides and sophides have attracted considerable attention in scientific research and technological applications. In this paper, by thermal evaporating a mixture of ZnO and SnO2, self-assembled nanowire-nanoribbon junction arrays of ZnO have been synthesized (Fig. 1) [1]. The growth is dominated by the vapor-liquid-solid (VLS) mechanism and Sn particles reduced from SnO2 serve as the catalyst for the growth. The axial nanowires (the “rattans”) are the result of fast growth along [0001], and the surrounding “tadpole-like” nanoribbons are the growth along〈10-10〉. An isotropic growth along six〈10-10〉results in the ordered radial distribution of the nanoribbons around the axial nanowire. The junction arrays of ZnO structures reported here are likely to have ultra-high surface sensitivity due to the unique structure, and they are a candidate for building sensors with ultra-high sensitivity.