合式PbSe纳米晶体的表面化学结构
Iwan Moreels1, Bernd Fritzinger, José C Martins
1Physics and Chemistry of Nanostructures, Ghent University, Krijgslaan 281-S12, BE-9000 Ghent, Belgium.
Journal of the American Chemical Society
|October 22, 2008
概括
核磁共振 (NMR) 光谱显示油酸是化 (PbSe) 纳米晶体上的主要有机封闭物. 这一发现有助于控制PbSe纳米晶体的大小并了解它们的稳定性.
科学领域:
- 结合体化学 结合体化学
- 材料科学是一种材料科学.
- 纳米技术 纳米技术
背景情况:
- 体半导体纳米晶体需要有机连接物来稳定和合成控制.
- 了解有机封装的精确成分对于定制纳米晶体特性至关重要.
研究的目的:
- 为了识别和量化有机封闭化 (PbSe) 纳米晶体上的有机封闭配体.
- 建立PbSe纳米晶体及其表面化学的完整结构模型.
- 为了研究PbSe纳米晶体在环境条件下的稳定性.
主要方法:
- 溶液核磁共振 (NMR) 光谱法用于分析连接物组成.
- 诱导合等离子体质谱 (ICP-MS) 用于元素定量.
- 合成PbSe纳米晶体与受控的联结体度.
主要成果:
- 油酸是主要的连接体,而tri-n-octylphosphine存在少量 (0-5%).
- 在合成过程中,可以通过调整油酸度来调整PbSe纳米晶体的大小.
- 一个结构模型揭示了非固体测量PbSe,其表面含有丰富的,与油酸封闭相一致.
- PbSe悬浮物的氧化导致连接体损失和酸的形成.
结论:
- 溶液核磁共振对PbSe纳米晶体上有机封闭的特征有效.
- 联体的组成直接影响PbSe纳米晶体的合成和稳定性.
- 表面的原子和油酸封闭是稳定的PbSe纳米晶体的关键特征.
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