Preparation of High Quality Ag2S Quantum Dots with Near-Infrared Emission and Their Applications in Bioimaging†

doi:10.7503/cjcu20170457

Abstract

Abstract:

A new method for preparing Ag₂S quantum dots(QDs) with near-infrared emission was presented by introducing the active sulfur precursor with alkylthiols as ligands. The high reactivity of sulfur precursor enables low temperature(< 120 ℃) syntheses, and produces Ag₂S QDs with small size. As-prepared samples were well characterized by means of UV-Vis-NIR absorption spectroscopy, transmission electron microscopy(TEM), X-ray powder diffraction(XRD) and energy-dispersive X-ray spectroscopy(EDX). As a result, the size of as-prepared Ag₂S QDs is tunable in a range from 1.7 nm to 3.5 nm with the inerease of reaction temperature from 50 ℃ to 120 ℃. Accordingly, the emission peak position of the Ag₂S QDs can be tuned from 700 nm to 830 nm. Also, the biomedical imaging results indicate that the as-prepared Ag₂S QDs is a nice carrier with low toxicity.

Key words: Ag2S, Quantum dots, Photoluminescence, Biomedical imaging

CLC Number:

O613
O649

TrendMD:

ZHANG Dan, YU Jinhai, LI Dongze, ZHOU Miao, ZHANG Ying. Preparation of High Quality Ag₂S Quantum Dots with Near-Infrared Emission and Their Applications in Bioimaging^†[J]. Chem. J. Chinese Universities, 2018, 39(4): 623.

Figures/Tables 6

Fig.1 TEM images of Ag2S nanocrystals prepared at 50 ℃(A), 70 ℃(B), 120 ℃(C) and EDS spectrum of Ag2S nanocrystals prepared at 120 ℃(D)

Fig.2 XRD patterns of as-prepared Ag2S nanocrystals with sizes of 3.5 nm(a), 2.6 nm(b) and 1.7 nm(c) and monoclinic Ag2S(d)

Fig.3 Temporal evolution of absorption spectra of Ag2S nanocrystals prepared at 50 ℃(A), 70 ℃(B), 120 ℃(C) and PL spectra of Ag2S nanocrystals prepared at different temperatures(D)

Table 1 Absorption peak and PL peak of Ag2S nanocrystals prepared by hot injection at different temperatures

Temperature/℃	Size/nm	Absorption peak position/nm	Emission peak position/nm
50	1.7	590	705
70	2.6	700	772
120	3.5	807	818

Fig.4 Bright field(A) and fluorescence(B) images of the MCF-7 cells incubated with Ag2S QDs

Fig.5 Viabilities of MCF-7 cells incubated with Ag2S QDs

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Preparation of High Quality Ag₂S Quantum Dots with Near-Infrared Emission and Their Applications in Bioimaging^†

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