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在小金纳米颗粒中"打开"高量子产量近红外发射

Scott E Crawford¹, Christopher M Andolina¹, Ashley M Smith¹

¹Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States.

Journal of the American Chemical Society

|November 7, 2015

概括

小金纳米颗粒 (AuNPs) 的基修饰启动光发. 调整这些配体上的硫替代剂显著改变了AuNP的排放特性,突出了表面化学的关键作用.

科学领域:

纳米技术
材料科学
物理化学

背景情况:

小金纳米粒子 (AuNPs) 弥合了分子和金属电子行为.
它们的光电子特性对于基础科学和应用至关重要.
了解连接体效应是控制纳米粒子行为的关键.

研究的目的:

在配体交换后研究金纳米粒子的光电子特性.
确定含硫配体如何影响光发光.
阐明表面化学在纳米粒子发射中的作用.

主要方法:

用胺结合金纳米颗粒的合成.
与各种含硫分子进行连接物交换.
光发光和辐射寿命的表征.

主要成果:

在引入硫联体时启动光发.
连接剂替代剂显著改变了光发光的量子产量 (0. 133. 65%).
较小的配体导致更强烈,更高的能量,更窄,更长寿命的排放.

结论:

表面化学非常关键地决定了小金纳米颗粒的光发光.
连接体架构从根本上改变了纳米粒子的电子特性和发射.
这些发现为调整光电子特征提供了机械洞察力.

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