使用密度梯度超离心法制备单分散纳米晶体
Melanie L Mastronardi1, Frank Hennrich, Eric J Henderson
1Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6.
Journal of the American Chemical Society
|July 12, 2011
概括
研究人员开发了一种方法,使用密度梯度超离心来分离均的纳米晶体 (ncSi). 这一突破使ncSi属性的精确研究能够用于先进的光电子和生物医学应用.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 物理化学 物理化学
背景情况:
- 纳米晶体 (ncSi) 具有尺寸依赖的特性,对于先进的应用至关重要.
- 现有的方法经常产生多分散的ncSi,阻碍了精确的属性分析.
- 用链表面被动化对于ncSi的稳定性和可加工性至关重要.
研究的目的:
- 开发一种用于大小分离多分散纳米晶的方法.
- 为了分离单分散的ncSi分数进行详细的表征.
- 为了研究ncSi.Si.的大小依赖性质.
主要方法:
- 通过sol-gel玻璃的热处理合成纳米晶体,然后进行HF蚀刻.
- 通过链对ncSi的表面被动化.
- 使用有机密度梯度超离心法与2,4,6-tribromotoluene在中进行ncSi的尺寸分离.
主要成果:
- 实现了单分散的纳米晶体,其多分散指数值在1.04和1.06之间.
- 通过密度梯度超离心成功分离了均的ncSi分数.
- 使用光发光谱学和HAADF-STEM.EM进行了分离的ncSi的表征.
结论:
- 开发的方法允许隔离单分散的ncSi.Si.
- 这使得能够精确量化依赖于尺寸的的结构,光学,电气和生物特性.
- 促进使用纳米晶的定制光电子和生物医学设备的开发.
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