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

A tin disulfide, polyethylene glycol technology, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as the properties and application research gaps 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: 2013-01-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • 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
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Effect test

Embodiment 1

[0036] ①First weigh 2.5mmol polyethylene glycol (0.5g) with a molecular weight of 200, 0.8mmol SnCl 4 ·5H 2 O, 3.2mmol of thioacetamide and 80mL of dilute hydrochloric acid (1mol / L) into a 250mL beaker, and magnetically stirred at room temperature for 30min. 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] ②After the reaction, the reaction kettle is naturally cooled to room temperature, and the polyethylene glycol / tin disulfide intercalated quantum dot dispersion can be obtained after filtration; the quantum dot dispersion can be centrifuged and dried to obtain the quantum dot solid powder. The interlayer spacing of the intercalation compound is 0.97 nm, and the fluorescence quantum efficiency of the aqueous quantum dot dispersion is 20%.

Embodiment 2

[0039] The steps are the same as in Example 1, except that the 2.5 mmol polyethylene glycol with a molecular weight of 200 in Example 1 is changed to 1.25 mmol polyethylene glycol with a molecular weight of 400. 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 intercalated quantum dots. The intercalation compound has an interlayer spacing of 0.95 nm, and its quantum dot aqueous dispersion has a fluorescence quantum efficiency of 36%.

Embodiment 3

[0041] The steps are the same as in Example 1, except that the 2.5 mmol polyethylene glycol with a molecular weight of 200 in Example 1 is changed to 0.833 mmol 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 intercalated quantum dots. The interlayer spacing of the intercalation compound is 0.95 nm, and the fluorescence quantum efficiency of the aqueous quantum dot 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 inorganic material preparation, and particularly 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 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 was confirmed by diffraction photographs. 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 by strong covalen...

Claims

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Application Information

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Patent Type & Authority Applications(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 JIAO TONG UNIV
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