Colloidal Second Near‐Infrared‐Emitting Mn‐Doped Ag2S Quantum Dots,ChemNanoMat

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Colloidal Second Near‐Infrared‐Emitting Mn‐Doped Ag2S Quantum Dots
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-03-23 , DOI: 10.1002/cnma.202000086
Sanghwa Jeong ₁ , Hyunmi Doh ₁ , Sungjee Kim ₁

Affiliation

Incorporation of transition metal dopants within a semiconductor nanocrystal has a tremendous effect on the optical and magnetic properties of the semiconductor nanocrystals. Herein, we report on a novel synthesis of second near‐infrared‐emitting photoluminescent Mn²⁺‐doped Ag₂S quantum dots via co‐pyrolysis of silver and manganese single‐source precursors. The Mn²⁺ doping level was flexibly tuned in Ag₂S quantum dots, which was confirmed by elemental analysis and electron paramagnetic resonance spectroscopy. The Mn²⁺ doping induced negligible change in the pristine monoclinic acanthite Ag₂S crystal structure but significantly decreased the photoluminescent intensity. Mn²⁺‐doped Ag₂S QDs exhibit second near‐infrared emission and ferromagnetic ordering, which show the potential applicability for multimodal fluorescence/MRI probes.

中文翻译：

胶态第二近红外发射Mn掺杂的Ag2S量子点

在半导体纳米晶体中掺入过渡金属掺杂剂对半导体纳米晶体的光学和磁性具有巨大的影响。本文中，我们通过银和锰单源前驱体的共热解研究了第二种近红外发光的Mn ²⁺掺杂的Ag ₂ S量子点的新型合成方法。Mn ²⁺掺杂水平可以在Ag ₂ S量子点中灵活调节，这已通过元素分析和电子顺磁共振波谱证实。Mn ²⁺掺杂引起的原始单斜硅a石Ag ₂ S晶体结构的变化可忽略不计，但显着降低了光致发光强度。锰掺杂^2+的Ag ₂ S QD表现出第二次近红外发射和铁磁有序性，显示出对多峰荧光/ MRI探针的潜在适用性。

更新日期：2020-03-23

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