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揭示了水性合体NIR-II量子点和水之间的能量传递机制

Hongchao Yang¹, Renfu Li², Ziqiang Sun¹

¹CAS Key Laboratory of Nano-Bio Interface, Division of Nanobiomedicine and i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China.

The Journal of chemical physics

|July 7, 2023

概括

研究人员发现,疏水界面可以通过抑制对水分子的能量转移来增强水中的量子点 (QD) 的光发光. 这提高了生物成像应用中的QD性能.

科学领域:

材料科学材料科学材料科学
摄影化学的使用.
纳米技术纳米技术

背景情况:

在第二个近红外窗口 (NIR-II) 中发射的性半导体量子点 (QD) 对生物成像至关重要.
通常用作分散剂的水在NIR-II区域表现出强烈的吸收性,可能会影响QD性能.
NIR-II发射器和水分子之间的相互作用在很大程度上被忽视了.

研究的目的:

为了研究NIR-II发射硫化银量子点 (Ag2S QD) 和水分子之间的相互作用.
为了提高 Ag2S QDs 在水环境中的光发光 (PL) 强度和寿命.
阐明QD与水相互作用背后的光物理机制.

主要方法:

合成有不同排放的,涂有三聚甘酸的Ag2S QDs (Ag2S/MUA).
使用 cetyltrimethylammonium化物 (CTAB) 来修改 Ag2S QD 的表面,以创建一个疏水界面.
使用短暂吸收和光光谱学进行表征.

主要成果:

合成了Ag2S/MUA QDs,其排放重叠在1200nm的吸水率上.
构建一个CTAB-MUA疏水接口显著提高了QD PL强度和延长寿命.
光谱分析表明,通过疏水界面,从Ag2S QDs到水的能量转移受到抑制.

结论:

在Ag2S QD和水之间发现了一种超越共振吸收的新能源传输机制.
疏水界面有效地减轻了对水的能量损失,改善了QD的光物理特性.
这一发现为QD光物理提供了关键的见解,并增强了它们在生物成像中的实用性.

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