Solution-Liquid-Solid Growth of Inorganic Materials

这个新的奖项给威廉S。华盛顿大学的Buhro支持 由化学部先进材料计划和 材料研究部固体化学计划。的 研究的重点是溶液-液体-固体的发展 (SLS)结晶技术作为一种通用的方法， 非分子无机固体的低温合成。主 SLS方法的特点是纳米尺寸的熔融物的分散 在有机金属前体中的铟或铟/镓液滴 溶液，从其中晶须晶体生长。催化有机金属 反应发生在液滴-溶液界面，沉积 将产品转化为液滴中的溶液。液滴变得 过饱和，驱动晶须生长。的具体目标 研究的主要内容是：（1）建立SLS生长的详细机制;（2） 获得对纳米晶须尺寸的控制并产生窄的尺寸分布， (3)三元体系中纳米晶须组合物的增益控制，（4） 研究异质结构纳米晶须的制备，以及（5）评估 SLS生长对III-V族氮化物和II-VI族氮化物合成的一般性 硫属化物 本研究将探讨一种新的 固态材料的低温路线受到化学和 与传统的高温方法相比， 受到前体挥发性的限制。由于新方法在动力学上 驱动，可以预期新的固相。固态纳米晶须 受控的组成和尺寸可能在电子和 光学应用

This new award to William S. Buhro at Washingon University is supported by the Advanced Materials Program in the Chemistry Division and the Solid-State Chemistry Program in the Division of Materials Research. The focus of the research is the development of the Solution-Liquid-Solid (SLS) crystallization technique as a general method for the low-temperature synthesis of nonmolecular inorganic solids. The primary feature of the SLS method is the dispersion of nonometer-size molten Indium or Indium/Gallium droplets in an organometallic precursor solution, from which the whisker crystals grow. Catalyzed organometallic reactions occur at the droplet-solution interface, depositing the products into solution in the droplet. The droplets become supersaturated, driving whisker growth. The specific goals of the research are to (1) establish the detailed mechanism of SLS growth, (2) gain control of nanowhisker sizes and produce narrow size distributions, (3) gain control of nanowhisker compositions in ternary systems, (4) investigate fabrication of heterostructured nanowhiskers, and (5) assess the generality of SLS growth to the synthesis of III-V nitrides and II-VI chalcogenides. This research will explore the mechanism and scope of a new low-temperature route to solid state materials limited by chemical and surface reactivity compared to traditional high temperature methods which are limited by precursor volatility. Since the new method is kinetically driven, new solid phases can be expected. Solid state nanowhiskers of controlled composition and size are likely to be useful in electronic and optical applications.