Kubota Yuta, Kishi Tetsuo, Yano Tetsuji, Matsushita Nobuhiro
Department of Materials Science and Engineering, Tokyo Institute of Technology 2-12-1 Ookayama, Meguro Tokyo 152-8550 Japan
RSC Adv. 2018 Jul 6;8(43):24370-24375. doi: 10.1039/c8ra05362f. eCollection 2018 Jul 2.
Ceria (CeO) wires with lengths of 6 μm and diameters of tens of nanometers are fabricated through the anisotropic growth of mesocrystals. In the gas-liquid precipitation process, an aqueous Ce(NO) solution is used as a starting material and NH gas is used to induce CeO precipitation at the gas-liquid interface. CeO mesocrystals, formed by this process at 60 °C, grow in the direction of 〈011〉 into micrometer length wires exposing {001} and {011} on their side walls. It is shown that the initial pH of the starting material solution is a key parameter to attain anisotropic growth of the CeO mesocrystals. We thus propose the formation mechanism of micrometer length-CeO wires from mesocrystals.
通过中晶的各向异性生长制备出长度为6μm、直径为几十纳米的二氧化铈（CeO）线。在气-液沉淀过程中，使用硝酸铈（Ce(NO)）水溶液作为起始原料，并使用氨气（NH）在气-液界面诱导CeO沉淀。在此过程中于60°C形成的CeO中晶，沿〈011〉方向生长成微米级长度的线，其侧壁暴露{001}和{011}面。结果表明，起始原料溶液的初始pH值是实现CeO中晶各向异性生长的关键参数。因此，我们提出了由中晶形成微米级长度CeO线的形成机制。
