科研之友
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摘要
Despite recent achievements in the synthetic processes of wurtzite ZnS nanostructures via the post-thermal decomposition of ZnS center dot(en)(0.5) (en = ethylenediamine) nanocomposites, investigation into the growth mechanism of wurtzite ZnS from ZnS center dot(en)(0.5) is still challenging. Diverse methods such as transmission electron microscopy, X-ray diffraction, thermal gravimetric analysis, X-ray photoelectron spectroscopy, and Fourier-transform infrared spectroscopy have been employed to understand the facile growth mechanism of wurtzite ZnS nanobelts showing intense ultraviolet luminescence. Wurtzite ZnS nanobelts have been found to form as en molecules escape via hydration from the lamellar structures of ZnS center dot(en)(0.5) nanobelts, which are a reaction intermediate produced at the early stage of the reaction. The chemical composition, the morphology, and the optical properties of the produced ZnS nanobelts have been controlled well by systematically varying time, temperature, and solvents. In particular, wurtzite ZnS nanobelts of 1.0 mu m in length, 80 nm in width, and 16 nm in thickness, grown optimally in a 1 : 1 : 2 volume mixture of water : en : N2H4 center dot H2O at 180 degrees C for 6 h, have intense and narrow band-edge emission at room temperature, suggesting their potential applications in nano-optoelectronic devices.
- 出版日期2014
