Polyethylene glycol/stannic sulfide intercalation quantum dot and hydrothermal synthesis method

A technology of tin disulfide and polyethylene glycol, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of properties and application research blanks of polyethylene glycol/tin disulfide intercalation compounds, and achieve excellent single/ The effect of two-photon fluorescence performance, easy operation, and simple preparation method

Inactive Publication Date: 2015-01-28
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, polyethylene glycol / tin disulfide intercalation compounds mainly generate LiSnS by first reacting tin disulfide with butyllithium. 2 Exfoliation compound method, and then prepare intercalation compound (Ollivier, P.J., et al., Chemical Communications, 1998, (15), pp 1563-1564.) by the method of compounding with polyethylene glycol; And prepare by this method The properties and applications of polyethylene glycol / tin disulfide intercalation compounds are still blank

Method used

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  • Polyethylene glycol/stannic sulfide intercalation quantum dot and hydrothermal synthesis method
  • Polyethylene glycol/stannic sulfide intercalation quantum dot and hydrothermal synthesis method
  • Polyethylene glycol/stannic sulfide intercalation quantum dot and hydrothermal synthesis method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] ①First weigh 2.5mmol of polyethylene glycol (0.5g) with a molecular weight of 200, 0.8mmol of SnCl 4·5H 2 O. 3.2 mmol of thioacetamide and 80 mL of dilute hydrochloric acid (1 mol / L) were placed in a 250 mL beaker, and dissolved under magnetic stirring at room temperature for 30 min. The molar ratio of tin salt, sulfur source and polyethylene glycol is 1:4:3.125. The resulting solution was transferred to a 100 mL reactor and reacted at 200°C for 12 hours.

[0037] ② After the reaction, the reaction kettle is naturally cooled to room temperature, and after filtration, the polyethylene glycol / tin disulfide intercalated quantum dot dispersion can be obtained; the quantum dot dispersion can be centrifuged and dried to obtain the quantum dot solid powder. The interlayer distance of the intercalation compound is 0.97nm, and the fluorescence quantum efficiency of the quantum dot aqueous dispersion is 20%.

Embodiment 2

[0039] The steps are the same as in Example 1, except that 2.5 mmol of polyethylene glycol with a molecular weight of 200 is changed into 1.25 mmol of polyethylene glycol with a molecular weight of 400 in Example 1. The molar ratio of tin salt, sulfur source and polyethylene glycol is changed from 1:4:3.125 to 1:4:1.5625. The product is polyethylene glycol / tin disulfide intercalation quantum dots. The interlayer distance of the intercalation compound is 0.95nm, and the fluorescence quantum efficiency of the quantum dot aqueous dispersion is 36%.

Embodiment 3

[0041] The steps are the same as in Example 1, except that 2.5 mmol of polyethylene glycol with a molecular weight of 200 in Example 1 is changed to 0.833 mmol of polyethylene glycol with a molecular weight of 600. The molar ratio of tin salt, sulfur source and polyethylene glycol is changed from 1:4:3.125 to 1:4:1.0417. The product is polyethylene glycol / tin disulfide intercalation quantum dots. The interlayer distance of the intercalation compound is 0.95nm, and the fluorescence quantum efficiency of the quantum dot aqueous dispersion is 38%.

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Abstract

The invention relates to a polyethylene glycol / stannic sulfide intercalation quantum dot and a hydrothermal synthesis method. The intercalation quantum dot takes stannic sulfide as the host and polyethylene glycol as the guest, and the polyethylene glycol enters stannic sulfide layers to obtain the quantum dot with a particle size of 3-5nm. Compared with the prior art, the preparation method is simple, the operation is easy, the obtained quantum dot is provided with superior single / two-photon fluorescence performance, and the quantum yield can reach up to 65%.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic materials, and in particular relates to a polyethylene glycol / tin disulfide intercalation quantum dot and a hydrothermal synthesis method thereof. Background technique [0002] The discovery of intercalation compounds has a history of hundreds of years. In 1841, C. Schafhautl immersed graphite in a mixture of sulfuric acid and nitric acid, and found that the expansion of graphite in the direction perpendicular to the cleavage plane was almost doubled. In the early 1930s, the X-ray phase identification technology was quite perfect, and the structure of the alkali metal intercalation compound of graphite had been determined by diffraction photos. Many inorganic compounds, such as phosphates, metal oxides, disulfides, layered silicates, etc., also have a typical layered structure. The characteristics of these compounds are that the atoms on the laminates interact with each other th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66
Inventor 宰建陶钱雪峰韩倩琰李波徐淼黄守双肖映林梁娜
Owner SHANGHAI JIAOTONG UNIV
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