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Seeded Synthesis of CdSe/CdS Rod and Tetrapod Nanocrystals
Published on: December 11, 2013
前体转化动力学和化纳米晶的核化
Jonathan S Owen1, Emory M Chan, Haitao Liu
1Department of Chemistry, University of California, Berkeley, California 94720, USA.
Journal of the American Chemical Society
|December 7, 2010
概括
化 (CdSe) 纳米晶体的形成速度受到前体转换的限制. 调整前体度可以控制纳米晶核形成,生长和最终颗粒大小.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 化学动力学 化学动力学
背景情况:
- 化 (CdSe) 纳米晶体在光电子学中至关重要.
- 了解它们的合成动力学对于控制材料特性至关重要.
研究的目的:
- 为了研究CdSe纳米晶体形成的动力学.
- 识别限制核和生长速度的因素.
- 建立控制纳米晶体大小的方法.
主要方法:
- 使用紫外线可见吸收光谱和NMR光谱.
- 采用了一个自动化,高通量合成平台.
- 研究了涉及八甲基酸 (Cd-ODPA) 和各种基酸的反应.
主要成果:
- 前体转化率 (Q(o)) 直接影响CdSe纳米晶核和生长.
- Q ((o) 取决于前体的度和结构.
- 增加的Cd-ODPA度影响了生长速度,但没有影响前体的反应性,影响了最终的颗粒数.
结论:
- 前体转化是CdSe纳米晶体合成中的速度限制步骤.
- 通过操纵前体转化率,可以控制CdSe纳米晶体的数量和大小.
- 一个不可逆转的前体反应为核和生长提供半导体溶液.
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