Scientific Research Academy, and School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, PR China.
Dalton Trans. 2013 Jun 7;42(21):7724-30. doi: 10.1039/c3dt50301a.
Template growth and catalytic growth are two typical mechanisms for the solution-chemistry synthesis of one-dimensional (1D) II-VI semiconductor nanomaterials. Here, we systematically demonstrate the competition relationship between them by tuning the synthesis of 1D ZnS nanostructures in different chain-length primary alkyl-amines. The template growth, derived from the coordination effect of amines, produces ZnS nanobelts and will compete with the Ag2S-catalyzed mechanism as AgNO3 is added into these amines. In short-chain n-propylamine and n-butylamine the template growth is much stronger than the catalytic growth, leading to the morphology maintenance of ZnS nanobelts, whereas the latter replaces the former in long-chain n-octylamine and n-dodecylamine due to the decrease of coordination ability of amines, which yields ZnS nanowires instead of nanobelts. A balance of competition is built between these two mechanisms in middle-length n-hexylamine, producing a mixture of ZnS nanobelts and nanowires. The morphology and growth mechanism changes of ZnS nanostructures have been rationally investigated using various characterization techniques. Meanwhile, the optical properties of the products synthesized before and after adding AgNO3 are comparatively studied by UV-vis absorption and photoluminescence (PL) spectra.
模板生长和催化生长是溶液化学法合成一维（1D）II-VI 半导体纳米材料的两种典型机制。在这里，我们通过调节不同链长伯胺中一维 ZnS 纳米结构的合成，系统地证明了它们之间的竞争关系。模板生长源于胺的配位作用，产生 ZnS 纳米带，并随着 AgNO3 加入这些胺中，与 Ag2S 催化机制竞争。在短链正丙胺和正丁胺中，模板生长比催化生长强得多，导致 ZnS 纳米带的形态得以保持，而在长链正辛胺和正十二胺中，由于胺的配位能力下降，后者取代了前者，生成 ZnS 纳米线而不是纳米带。在中等链长的正己胺中，这两种机制之间建立了一种竞争平衡，生成了 ZnS 纳米带和纳米线的混合物。通过各种表征技术，合理地研究了 ZnS 纳米结构的形貌和生长机制的变化。同时，通过紫外-可见吸收和光致发光（PL）光谱比较研究了添加 AgNO3 前后合成产物的光学性质。
