Zhang Zhiqing, Mu Jin
Department of Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
J Colloid Interface Sci. 2007 Mar 1;307(1):79-82. doi: 10.1016/j.jcis.2006.10.035. Epub 2006 Dec 12.
Homocentric ZnO nanobundles with pyramidlike and hexagonal prism shapes were synthesized in colloidal systems formed by PEO-PPO-PEO amphiphilic block copolymers. The prism- and pyramidlike ZnO crystals were produced by L64 and F68, respectively, which may be attributed to the different growth rates of various crystal facets. It was proposed that the two processes for crystallization, including nucleation and crystal growth, happened in the macromolecular micelles under hydrothermal conditions. The room-temperature photoluminescence spectra of the ZnO products showed sharp ultraviolet emission located around 390 nm originating from the radiative recombination of free excitons. The sharp emission, with a half-maximum of about 8 nm, gave a powerful attestation that the sample was of high crystal quality, which was consistent with the SEM and TEM observations. The single ultraviolet emission is important for the application of ZnO-based materials in the electronic and photonic realms.
在由聚环氧乙烷-聚环氧丙烷-聚环氧乙烷两亲性嵌段共聚物形成的胶体体系中合成了具有金字塔状和六棱柱形状的同心氧化锌纳米束。六棱柱状和金字塔状的氧化锌晶体分别由L64和F68生成，这可能归因于不同晶面的生长速率不同。有人提出，包括成核和晶体生长在内的两个结晶过程是在水热条件下的大分子胶束中发生的。氧化锌产物的室温光致发光光谱显示，在390 nm左右有尖锐的紫外发射，这源于自由激子的辐射复合。半高宽约为8 nm的尖锐发射有力地证明了样品具有高晶体质量，这与扫描电子显微镜和透射电子显微镜的观察结果一致。单一的紫外发射对于氧化锌基材料在电子和光子领域的应用很重要。
