相关实验视频

Updated: Jan 17, 2026

Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles

Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles

Published on: June 25, 2018

加快的系统间交叉增强了AU₅₂(SR) ₃₂纳米集群中的NIR发射,通过表面连接体工程

Linlin Zeng¹, Yitong Wang², Junjun Tan³

¹Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China Hefei Anhui 230026 P. R. China yiluo@ustc.edu.cn mzhou88@ustc.edu.cn.

Chemical science

|September 18, 2025

概括

连接物修饰增强金纳米集团光发光,通过加速三重状态的形成和减少能量损失. 这提高了它们在传感和生物成像等应用中的潜力.

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:

表面连接物修饰是提高原子精确金纳米集群中的光发光 (PL) 的关键.
精确的机制,特别是三重状态在PL增强中的作用,尚未完全理解.

研究的目的:

为了研究金纳米集群 (Au52(SR) 32中三连体状态的形成和放松动态,具有不同的配体.
阐明连接体结构在调节兴奋状态动态和光发光增强中的作用.

主要方法:

合成了四个Au52(SR) 32纳米集群,具有不同的-R组.
采用电子探针光谱法来探测兴奋状态动态.
分析了金属核心的低频振动和带对非辐射放松的贡献.

主要成果:

含甲基化配体较少的纳米团显示出更快的系统间交叉 (ISC),增强了三重状态的排放.
金属核心振动在纳米集群中是相似的,表明连接体振动主导非辐射放松.
连接体工程加速ISC并减少振动能耗,从而导致PL增强.

结论:

黄金纳米集群中体诱导的光发光增强是由加速的系统间交叉和减少的振动散射驱动的.
三重体状态动态对于定制金纳米集群的排放特性至关重要.
这些发现支持在传感,生物成像,光电子和太阳能转换等领域的潜在应用.

更多相关视频

Synthesis of Near-Infrared Emitting Gold Nanoclusters for Biological Applications

Synthesis of Near-Infrared Emitting Gold Nanoclusters for Biological Applications

Published on: March 22, 2020

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Published on: March 2, 2016

相关概念视频

Nuclear Overhauser Enhancement (NOE)

Nuclear Overhauser Enhancement (NOE)

Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...

Nuclear Transmutation

Nuclear Transmutation

Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...