Synthesis of Ag2S Based Quantum Dots with Near-infrared-II Fluorescence Emission in Water

doi:10.6023/A21070333

Acta Chimica Sinica ›› 2021, Vol. 79 ›› Issue (10): 1281-1285.DOI: 10.6023/A21070333 Previous Articles Next Articles

Article

Ag₂S基近红外II区荧光量子点的水相合成优化探究

余梦^b, 张子俊^a, 朱国委^a, 谷振华^a, 段玉霖^a, 余良翀^a, 高冠斌^a^,^*(), 孙涛垒^a^,^b^,^*()

a 武汉理工大学材料复合新技术国家重点实验室武汉 430070
b 武汉理工大学化学化工与生命科学学院武汉 430070

投稿日期:2021-07-16 发布日期:2021-08-13
通讯作者: 高冠斌, 孙涛垒
作者简介:
† 共同第一作者
基金资助:
国家自然科学基金(21975191); 国家自然科学基金(21805218); 国家自然科学基金(51873168); 国家级大学生创新创业训练计划(202110497008)

Synthesis of Ag₂S Based Quantum Dots with Near-infrared-II Fluorescence Emission in Water

Meng Yu^b, Zijun Zhang^a, Guowei Zhu^a, Zhenhua Gu^a, Yulin Duan^a, Liangchong Yu^a, Guanbin Gao^a(), Taolei Sun^a^,^b()

a State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070
b School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070

Received:2021-07-16 Published:2021-08-13
Contact: Guanbin Gao, Taolei Sun
About author:
† These authors contributed equally to this work
Supported by:
National Natural Science Foundation of China(21975191); National Natural Science Foundation of China(21805218); National Natural Science Foundation of China(51873168); National innovation and Entrepreneurship Training Program for College Students(202110497008)

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Abstract

Growing numbers of quantum dots (QDs) have been applied in biological fluorescence imaging, especially those QDs with near-infrared-II fluorescence emission, avoiding the interference of autofluorescence of biological tissues, have broad application prospects in the field of fluorescence imaging. In particularly, Ag₂S quantum dots (Ag₂S QDs) have drew great attention of researchers in biological fluorescence imaging due to the near-infrared fluorescence emission, large Stokes shift, good light and chemical stability. However, the Ag₂S QDs synthesized in organic phase usually experienced poor water solubility and biocompatibility, while the fluorescence of the Ag₂S QDs synthesized in aqueous phase is difficult to reach the near-infrared-II region, which severely restricts the promotion of Ag₂S QDs in biological fluorescence imaging. Therefore, it is of great significance to optimize and explore the water-phase synthesis method of Ag₂S based quantum dots with near-infrared-II fluorescence emission. The goal of this work is to synthesize Ag₂S QDs with near-infrared-II region fluorescence emission by aqueous phase method. First, captopril modified Ag₂S QDs (Ag₂S@Cap QDs) were prepared in water, and its fluorescence emission peak lied in the near-infrared-II region at 1005 nm. Then a series of Zn:Ag₂S@Cap QDs were prepared in aqueous by introducing ZnS to the Ag₂S core. The results showed that the fluorescence emission peaks of Zn:Ag₂S@Cap QDs blue shifted in a core-doping ZnS-dose dependent manner. Next, a series of Ag₂S@Cap-Zn QDs were prepared in aqueous by introducing Zn²⁺ to the ligand-shell of Ag₂S QDs. The fluorescence emission peaks of these Ag₂S@Cap-Zn QDs also blue shifted in a Zn²⁺-dose dependent manner. Finally, Ag₂S@MUA QDs were prepared by replacing the shell ligand from Cap to 11-mercaptoundecanoic acid (MUA). The fluorescence emission peak of these Ag₂S@MUA QDs red shifted to 1105 nm, locating in the near-infrared-II region, and the width of the fluorescence curve at half-maximum height became narrower, implying better application prospect in biological fluorescence imaging. This work not only successfully prepared a kind of Ag₂S QDs with near-infrared-II fluorescence emission in aqueous phase, but also opened an avenue for the preparation and optimization of semiconductor QDs with near-infrared fluorescence.

Key words: near-infrared-Ⅱ fluorescence, Ag₂S QDs, aqueous synthesis, core-doping, cationic-modification, optimizing surface ligand

Cite this article

Meng Yu, Zijun Zhang, Guowei Zhu, Zhenhua Gu, Yulin Duan, Liangchong Yu, Guanbin Gao, Taolei Sun. Synthesis of Ag₂S Based Quantum Dots with Near-infrared-II Fluorescence Emission in Water[J]. Acta Chimica Sinica, 2021, 79(10): 1281-1285.

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Figure 1. (a) TEM image of Ag2S@Cap QDs (insert: high resolution image), (b) hydrated particle size of Ag2S@Cap QDs, (c) Zeta potential of Ag2S@Cap QDs, (d) FT-IR spectra of Ag2S@Cap QDs (black curve) and Cap (red curve), (e) UV-Vis absorption spectrum of Ag2S@Cap QDs, and (f) near-infrared fluorescence spectrum of Ag2S@Cap QDs

Figure 2. (a) HAADF images of Zn:Ag2S@Cap QDs via core doping ZnS, single element of Ag (b), S (c) and Zn (d) distribution by EDS mapping, hydrated particle size (e), Zeta potential (f), FT-IR spectra (g) and near-infrared fluorescence spectra (h) of Ag2S@Cap QDs and three Zn:Ag2S@Cap QDs core-doped with different dose of ZnS

Figure 3. (a) HAADF images of Ag2S@Cap-Zn QDs prepared by ligand cationic modification of Zn2+, single element of Ag (b), S (c) and Zn (d) distribution by EDS mapping, hydrated particle size (e), Zeta potential (f), FT-IR spectra (g) and near-infrared fluorescence spectra (h) of Ag2S@Cap QDs and three Ag2S@Cap-Zn QDs prepared by ligand cationic modification of Zn2+ with different doses

Figure 4. (a) TEM image of Ag2S@MUA QDs (insert: high resolution image), (b) hydrated particle size and (c) Zeta potential of Ag2S@Cap QDs and Ag2S@MUA QDs, (d) FT-IR spectra of Ag2S@MUA QDs and MUA and (e) UV-Vis absorption spectra and (f) near-infrared fluorescence spectra of Ag2S@Cap QDs and Ag2S@MUA QDs

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Ag₂S基近红外II区荧光量子点的水相合成优化探究

Synthesis of Ag₂S Based Quantum Dots with Near-infrared-II Fluorescence Emission in Water

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Ag2S基近红外II区荧光量子点的水相合成优化探究