《华中科技大学文华学院毕业设计(论文)文献综述及外文文献翻译》1.doc

1、华中科技大学文华学院毕业设计（论文）外文文献翻译（本科学生用） 题目: 对用高温高压连续流微反应合成磷化铟晶体的研究学 生 姓 名：饶龙 学号：080110021117学 部 （系）:信息科学与技术学部专 业 年 级: 电子科学与技术2班指 导 教 师：慎晓丽 职称或学位：讲师2012 年2月 27日 外文文献翻译（译成中文1000字左右）：【主要阅读文献不少于5篇，译文后附注文献信息，包括：作者、书名（或论文题目）、出 版 社（或刊物名称）、出版时间（或刊号）、页码。提供所译外文资料附件（印刷类含封面、封底、目录、翻译部分的复印件等，网站类的请附网址及原文】Investigation of

2、Indium Phosphide Nanocrystal Synthesis Using a High-Temperature and High-Pressure Continuous Flow Microreactor Jinyoung Baek, Peter M. Allen, Moungi G. Bawendi,* and Klavs F. Jensen Indium phosphide (InP) nanocrystals1are of significant interest for use in optoelectronic devices, specifically as a r

3、eplacement for CdSe nanocrystals in commercial applications. However, the current mechanistic understanding and synthetic procedures for InP nanocrystals has not yet reached the same level as for CdSe nanocrystal synthesis.2 Using a truly continuous three-stage microfluidic reactor to precisely tune

4、 reaction conditions in the mixing, aging, and sequential growth regimes, our study described here builds on previous InP nanocrystal synthetic3 and mechanistic work4 to probe the significant experimental parameters involved in InP nanocrystal syntheses. We find that the growth of InP nanocrystals i

5、s dominated by the aging regime, which isconsistent with a model of InP nanocrystal growth where nanocrystal growth is dominated by nonmolecular processes such as coalescence from nonmolecular InP species and interparticle ripening processes.4 The InP growth model is in contrast to the molecular-bas

6、ed growth of nanocrystals as observed in CdSe and PbSe nanocrystals.2af We observe that the size of InP nanocrystals is predominantly dependent on the concentration of free fatty acid in solution and the aging temperature. Other experimental parameters such as injection temperature and particle conc

7、entration do not appear to significantly affect InP nanocrystal size or size distributions. In addition, we probe the ability to grow larger InP nano-crystals through the sequential injection of precursors in the third stage of the microfluidic reactor. The use of high temperatures and high pressure

8、s in a continuous microfluidic system allows for a wide selection of solvents, precursors, and ligand systems, providing a vastly increased parameter space to explore synthetic conditions.The utilization of low-molecular-weight solvents at high pressures offers supercritical conditions tunable from

9、liquid to gas like providing high diffusion rates, improved mixing,6 and the ability to solubilize various compounds inaccessible by solvents employed in traditional nanocrystal syntheses.2b,c, 3, 7 The use of a supercritical solvent in a microfluidic reactor results in narrower residence time distr

10、ibutions, producing homogeneous reaction conditions ideal for nano-crystal synthesis.8 Microfluidic systems allow precise control over reaction conditions and reproducibility9 as a result of rigorous control of heat and mass transfer.10 In addition, themicrofluidic system can be utilized for fast sc

11、reening of reaction parameters with in situ reaction monitoring.11 Figure 1 illustrates our truly continuous three-stage sili-con-based microfluidic system consisting of mixing, aging, and sequential injection stages operating at a pressure of 65 bar, without incorporating any manual batch manipulat

12、ion between synthesis steps.2h We have separated each stage in order to independently probe mixing and aging processes. The first two stages of the reactor were utilized for the systematic study of InP nanocrystal formation (Figure 1 a,b). The mixing reactor was maintained at a uniform temperature t

13、o investigate the effect of different mixing temperatures. Alternatively, the first reaction stage can be heated to create a temperature gradient in order to rapidly obtain highly crystalline InP nanocrystals with relatively narrow size distributions (see Figure S1 in the Supporting Information,). T

14、he second (aging) stage of the reactor was operated at temperatures ranging from 200340 8C to study the effect of aging temperature. In the third stage of the system, a sequential injection reactor (Figure 1 c) was used to supply more molecular precursors for the further growth of InP nanocrystals.

15、In the case of most InP nanocrystal syntheses, both the aging and sequential growth reactors were maintained at 320 8C to utilize supercritical octane (Tc = 296.17 8C and Pc = 2.50 m Pa). Octane was selected as the solvent in order to provide excellent mixing, fast diffusivity, and sufficient densit

16、y for the solubilization of all reagents. 对用高温高压连续流微反应合成磷化铟纳米晶体的研究 Jinyoung Baek,彼得m艾伦,Moungi g . Bawendi、*和Klavs f詹森 磷化铟(InP)纳米晶1用于光电设备具有的重大价值,特别是在商业应用中作为一个硫化锌奈的替代品。然而，就硫化锌纳米晶体的合成来说，当前对InP纳米结晶机械的理解和合成程序尚未达到相同的水平。使用一个真正的连续三阶段的微流控反应堆来精确协调混合、老化和连续增长状态的反应条件,我们这里描述的研究建立在之前的铟的纳米晶体合成和机械的工作之上来探测重要的实验参数包含InP纳米晶体的合成。我们发现的增长主要来自InP纳米晶体老化的状态,这是用一种模型一致InP纳米晶体增长,主要是无分子状态组成的纳米晶体生长过程,如聚结从无