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相关概念视频

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.

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A Rapid and Quantitative Fluorimetric Method for Protein-Targeting Small Molecule Drug Screening
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在原子精确的金纳米集群中激活高效的近红外发光

Ya-Ni Yang1, Qiu-Yang Wan1, Meng-Jie Zhu1

  • 1Henan Key Laboratory of Crystalline Molecular Functional Materials, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.

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|July 18, 2025
PubMed
概括

这项研究揭示了压力如何通过控制结构扭曲来增强黄金纳米集群中的近红外 (NIR) 发光. 一个纳米集群 ([Au11]-1) 在压力下实现了创纪录的75.6%的NIR光发光量子产量 (PLQY).

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科学领域:

  • 材料科学
  • 纳米技术
  • 固态物理

背景情况:

  • 在原子精确的金纳米集群中实现高效的近红外 (NIR) 发光受到金芯的振动自由的阻碍.
  • 现有的方法难以克服固态黄金纳米集群的光发光量子产量 (PLQY) 的内在限制.

研究的目的:

  • 在水静压下研究两种合成的黄金纳米集群[Au11](PPh3) 8Cl2]Cl (Au11-1) 和Au11(PPh3) 7Cl3 (Au11-2) 的焦点发光行为.
  • 阐明压力下的金纳米集群中NIR发光增强的结构属性关系.

主要方法:

  • 合成两个不同的金纳米集群,Au11-1和Au11-2.
  • 在水静压下对NIR光的系统研究.
  • 在现场高压角分散X射线衍射,理论计算,秒短暂吸收和拉曼光谱.

主要成果:

  • 在3.6GPa时,Au11-1的NIR-PLQY显著增加,从0.3%增加到75.6%,这是固态黄金纳米集群中报告的最高值.
  • Au11-2在压缩下表现出单调的发光灭.
  • 在Au11-1和Au11-2中观察到明显的异构压缩和金芯的差异性结构扭曲,与发光变化相关.

结论:

  • 在Au11-1中压力诱导的定向结构扭曲抑制了来自低频振动的非辐射损失,导致显著的NIR光增强.
  • 这项研究确立了NIR-PLQY与原子尺度上的金属核心振动放松之间的明显相关性.
  • 通过可控结构扭曲设计高性能NIR发光材料提供了一种新的策略.