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Báo cáo hóa học: "Growth of vertically aligned ZnO nanorods using textured ZnO films"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Growth of vertically aligned ZnO nanorods using textured ZnO films | Solís-Pomar et al. Nanoscale Research Letters 2011 6 524 http www.nanoscalereslett.eom content 6 1 524 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Growth of vertically aligned ZnO nanorods using textured ZnO films Francisco Solís-Pomar1 2 Eduardo Martinez 3 Manuel F Melendrez4 and Eduardo Perez-Tijerina1 2 Abstract A hydrothermal method to grow vertical-aligned ZnO nanorod arrays on ZnO films obtained by atomic layer deposition ALD is presented. The growth of ZnO nanorods is studied as function of the crystallographic orientation of the ZnO films deposited on silicon 100 substrates. Different thicknesses of ZnO films around 40 to 180 nm were obtained and characterized before carrying out the growth process by hydrothermal methods. A textured ZnO layer with preferential direction in the normal c-axes is formed on substrates by the decomposition of diethylzinc to provide nucleation sites for vertical nanorod growth. Crystallographic orientation of the ZnO nanorods and ZnO-ALD films was determined by X-ray diffraction analysis. Composition morphologies length size and diameter of the nanorods were studied using a scanning electron microscope and energy dispersed x-ray spectroscopy analyses. In this work it is demonstrated that crystallinity of the ZnO-ALD films plays an important role in the vertical-aligned ZnO nanorod growth. The nanorod arrays synthesized in solution had a diameter length density and orientation desirable for a potential application as photosensitive materials in the manufacture of semiconductor-polymer solar cells. PACS 61.46.Hk Nanocrystals 61.46.Km Structure of nanowires and nanorods 81.07.Gf Nanowires 81.15.Gh Chemical vapor deposition including plasma-enhanced CVD MOCVD ALD etc. Keywords vertical-aligned ZnO nanorods atomic layer deposition hydrothermal method Background ZnO wurtzite hexagonal phase is one of the most important functional materials due to its excellent physicochemical properties and its .