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CuInS2 quantum dots with sphalerite structure and wurtzite structure and preparation method thereof

A technology of quantum dots and sphalerite, which is applied in the field of nanomaterials, can solve the problems of high temperature and environmentally unfriendly organic solvents, and achieve the effects of simple equipment, uniform particle size distribution, and simple preparation process.

Inactive Publication Date: 2010-08-18
INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, in these synthetic methods, high temperature and environmentally unfriendly organic solvents are used

Method used

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  • CuInS2 quantum dots with sphalerite structure and wurtzite structure and preparation method thereof
  • CuInS2 quantum dots with sphalerite structure and wurtzite structure and preparation method thereof
  • CuInS2 quantum dots with sphalerite structure and wurtzite structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Zinc blende structure CuInS 2 Preparation method of quantum dots:

[0024] CuCl 2 (0.1mmol) and InCl 4 4H 2 O (0.1mmol) was stirred and dissolved in 35mL of absolute ethanol; 1.2mmol of p-bromothiophenol was added to the mixed solution, stirred, and a light yellow flocculent precipitate appeared in the solution; in addition, Na 2 S·9H 2 O (0.4 mmol) was sonicated in 15 mL of absolute ethanol for 10 minutes. Na 2 S solution was added to 35 mL of CuCl 2 and InCl 4 In the mixture, the solution turned reddish brown. Finally, the mixture was transferred into a 60 mL autoclave lined with polytetrafluoroethylene, and kept at 200° C. for 16 hours. After the autoclave was naturally cooled to room temperature, the upper liquid was removed to obtain a brown precipitate; the precipitate was washed with absolute ethanol and centrifuged (16000rpm, 10min), and the product was dried in a vacuum oven at 60°C for 6 hours to obtain CuInS 2 Powder composed of quantum dots.

[00...

Embodiment 2

[0027] Wurtzite CuInS 2 Preparation method of quantum dots:

[0028] CuCl 2 (0.1mmol) and InCl 4 4H 2 O (0.1mmol) was stirred and dissolved in 35mL absolute ethanol; 35mmol hexanethiol was added to the mixed solution, stirred, and a white flocculent precipitate appeared in the solution; in addition, Na 2 S·9H 2 O (0.4 mmol) was sonicated in 15 mL of absolute ethanol for 10 minutes. Na 2 S solution was added to 35 mL of CuCl 2 and InCl 4 In the mixture, the solution turned reddish brown. Finally, the mixture was transferred into a 60 mL autoclave lined with polytetrafluoroethylene, and kept at 200° C. for 16 hours. After the autoclave was naturally cooled to room temperature, the upper liquid was removed to obtain a brown precipitate; the precipitate was washed with absolute ethanol and centrifuged (16000rpm, 10min), and the product was dried in a vacuum oven at 60°C for 6 hours to obtain CuInS 2 Powder composed of quantum dots.

[0029] Powder XRD test shows that th...

Embodiment 3

[0031] Wurtzite CuInS 2 Preparation method of quantum dots:

[0032] CuCl 2 (0.1mmol) and InCl 4 4H 2 O (0.1mmol) was stirred and dissolved in 35mL absolute ethanol; 35mmol ethanethiol was added to the mixed solution, stirred, and white flocculent precipitation appeared in the solution; in addition, Na 2 S·9H 2 O (0.4 mmol) was sonicated in 15 mL of absolute ethanol for 10 minutes. Na 2 S solution was added to 35 mL of CuCl 2 and InCl 4 In the mixture, the solution turned reddish brown. Finally, the mixture was transferred into a 60 mL autoclave lined with polytetrafluoroethylene, and kept at 200° C. for 16 hours. After the autoclave was naturally cooled to room temperature, the upper liquid was removed to obtain a brown precipitate; the precipitate was washed with absolute ethanol and centrifuged (16000rpm, 10min), and the product was dried in a vacuum oven at 60°C for 6 hours to obtain CuInS 2 Powder composed of quantum dots.

[0033] Powder XRD test shows that th...

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Abstract

The invention discloses CuInS2 quantum dots with a sphalerite structure and a wurtzite structure and a preparation method thereof. The CuInS2 quantum dots of which the grain sizes are between 2 and 5 nanometers are synthesized through a solvent hot reaction by using environmental-friendly ethanol as a solvent; and the CuInS2 quantum dots of two crystal forms, namely the CuInS2 quantum dots with the sphalerite structure and the wurtzite structure are prepared by changing the variety of a surfactant, namely thiophenol or mercaptan. The prepared quantum dots have the good dispersibility in an organic solvent, and have important application value in fields of optical materials, coating materials, photovoltaic materials, organic-inorganic composite materials and the like.

Description

technical field [0001] The invention relates to the field of nanomaterials, specifically CuInS with sphalerite structure and wurtzite structure 2 Quantum dots and methods for their preparation. Background technique [0002] Nanostructured semiconductor materials have a wide range of applications in science and technology, including catalysis, photoelectric conversion, thermoelectric conversion, biodetection, and photosensors [Ref: J.Am.Chem.Soc.2008, 130, 11430-11436]. CuInS 2 Belonging to I-III-VI ternary compounds, it is a direct bandgap semiconductor material with a bandgap of 1.5eV [see: Chem.Mater.2003, 15, 3142-3147] and a large absorption coefficient (α≈10 5 cm -1 ) [See: Cryst.Growth Des.2007, 7, 1547-1552], considered to be the most efficient light-absorbing material in solar cells [See: J.Mater.Chem.2006, 16, 1597-1602, NanoLett.2006 , 6, 1218-1223]. Currently, the synthesis of CuInS 2 The methods of quantum dots are: pyrolysis of single-sources precursors me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G15/00
Inventor 韩士奎王命泰岳文瑾
Owner INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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