连接物稳定纳米粒子:合成,组织和动力学
1Laboratoire de Chimie de Coordination du CNRS, 205, route de Narbonne, 31077 Toulouse Cédex 04, France.
Journal of the American Chemical Society
|August 2, 2001
概括
在温和条件下合成的纳米颗粒表现出不同的尺寸和形状,取决于所使用的稳定剂. 聚合物 (如聚乙烯) 产生统一的纳米粒子,而胺则促进棒状结构.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 催化剂是一种催化剂.
背景情况:
- 纳米粒子 (Ru NPs) 在催化和材料科学中至关重要.
- 控制纳米粒子的大小,形状和分散是它们应用的关键.
- 在温和条件下,前体bis{1,5-cyclooctadiene}{1,3,5-cyclooctatriene}ruthenium{0) [Ru}{COD}{COT}]允许NP合成.
研究的目的:
- 通过使用Ru(COD) ((COT) 前体,研究纳米颗粒 (Ru NPs) 的合成.
- 探索各种稳定剂 (聚合物,胺,乙醇) 对Ru NP特性的影响.
- 了解合成的Ru NPs的结构,形态和稳定性.
主要方法:
- 在温和条件下 (室温,1-3 bar H2) 在THF中分解Ru (COD) (COT) 前体.
- 稳定剂的使用:聚合物 (聚乙烯利),纤维素酸盐,胺 (C8-C16) 和乙醇 (C8-C16).
- 鉴定技术:微分析,二氧化碳吸附红外光谱,HRTEM,WAXS和13C NMR.
主要成果:
- 结晶hcp Ru NPs的合成尺寸从1.1到3纳米不等.
- 聚合物稳定剂导致分散 (PVP) 或聚合 (CA) 的NP.
- 氨基稳定剂导致分散的,通常是长长的,棒状的NP,归因于连接体交换.
- 醇稳定剂导致聚合的NP,并观察到醇转化为二硫化物.
结论:
- 稳定剂的选择极大地影响了Ru NP的大小,形状,分散和形态.
- 氨基联结物促进了异构的Ru NP结构的形成.
- 硫醇稳定剂可以在Ru NP表面发生催化转化.
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