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A kind of method utilizing self-assembly to prepare PBS nano sheet

A nanosheet and self-assembly technology, applied in the field of nanomaterials, can solve the problems of limiting the application of electronic devices, difficulty in monodispersity, and small size of PbS nanosheets, and achieves easy operation, easy transfer to any substrate, and simple and easy operation line effect

Active Publication Date: 2018-04-17
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The small size of PbS nanosheets prepared by the solution method is difficult to control the monodispersity, which limits its application in electronic devices
Self-assembly is a method of forming large-area thin films from nanoparticles. This method is simple and easy to operate, and the formed films can be transferred to any substrate, which is more practical. However, the synthesis of large-area nanosheets using this method has not been reported yet.

Method used

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  • A kind of method utilizing self-assembly to prepare PBS nano sheet
  • A kind of method utilizing self-assembly to prepare PBS nano sheet
  • A kind of method utilizing self-assembly to prepare PBS nano sheet

Examples

Experimental program
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Effect test

preparation example Construction

[0067] (a) Preparation of PbS spherical nanoparticles

[0068] Put 180mg of lead oxide, 8mL of oleic acid and 8mL of octadecene in a 50mL three-necked flask, heat it to 120°C, remove water and air in a vacuum, and after 2h, inject nitrogen gas, raise the temperature of the solution to 130°C, and quickly inject the solution There is 82 μL of hexamethyldisilathane in 4 mL of octadecene solution, and the temperature of the solution is lowered to 100° C. for 20 minutes. After the reaction stopped, the PbS nanoparticles were precipitated twice with absolute ethanol, and the PbS spherical nanoparticles were dispersed in an octane solvent and placed in a glove box for later use.

[0069] (b) Preparation of PbS cubic nanoparticles

[0070] Take 10 mL of the above-mentioned PbS spherical nanoparticles in a 50 mL single-necked bottle, add 10 mL of oleic acid solution, and react at 90° C. for 1 h, and the reaction is carried out in a glove box. The obtained nanoparticles are precip...

Embodiment 1

[0073] (1) Disperse PbS cubic nanoparticles in octane solvent, take 30 μL octane solution of PbS cubic nanoparticles and disperse them in 420 μL n-hexane solvent, add 1.2 μL oleic acid, mix well, and quickly drop the mixed solution to On the liquid surface of 6mL diethylene glycol, a PbS monolayer supercrystalline film was formed after 1h.

[0074] figure 2 It is a transmission electron microscope image of the PbS supercrystalline thin film prepared by the above method.

[0075] (2) The formed PbS single-layer supercrystalline film and its lower phase 6mL diethylene glycol solution were placed on a hot stage at 50° C. for 1 h to prepare PbS nanosheets.

Embodiment 2

[0077] (1) is the same as step (1) of embodiment 1.

[0078] (2) The formed PbS single-layer supercrystalline film and 6 mL of diethylene glycol solution as the lower phase were placed on a hot stage at 100° C. for 1 h to prepare PbS nanosheets.

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Abstract

The invention discloses a method for preparing a PbS nanosheet by using self-assembly. The method comprises the following steps of dissolving PbS cube nanoparticles in a solution formed by an organic solvent A to be dispersed in an organic solvent B, adding a stabilizer to obtain a mixed solution after uniform mixing, adding the mixed solution to a gas-liquid interface, and standing to form a PbS monolayer super-crystal structure thin film on the gas-liquid interface; and then, preparing the PbS nanosheet from the PbS monolayer super-crystal structure thin film on the gas-liquid interface. The PbS nanosheet prepared in the invention is large in size range, is high in compatibility with a substrate, can be applied to photoelectronic devices on a large scale, is simple in preparation and low in cost, and has good prospects.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and in particular relates to a method for preparing PbS nanosheets by self-assembly. Background technique [0002] Semiconductor nanomaterials have tunable optical / electrical properties, ease of solution preparation, and low cost. These advantages make semiconductor nanomaterials widely used in solar cells, light-emitting diodes, field-effect transistors, photodetectors, and thermoelectric devices. Applications. [0003] To apply semiconductor nanomaterials in optoelectronic devices, carrier wave functions must be coupled. Compared with nanoparticles, the large lateral size of nanosheets is beneficial to reduce the number of carrier jumps between the two electrodes. At the same time, compared with nanoparticles, nanosheets have a larger absorption cross-section and narrower fluorescence emission peaks. These advantages make semiconductor nanosheets popular in optoelectronic devices (Acc.Chem....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G21/21B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G21/21C01P2004/04C01P2004/38C01P2004/50C01P2004/61C01P2004/64
Inventor 唐智勇赵曼
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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