Synthetic method of nanometer AgGaS2 nonlinear optical crystal

A technology of nonlinear crystals and synthesis methods, applied in nonlinear optics, chemical instruments and methods, optics, etc., can solve the problems of uneven size and morphology, no quantum size effect, etc., and achieve the effect of uniform morphology

Inactive Publication Date: 2014-03-19
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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Problems solved by technology

For example, Professor Yan Chunhua of Peking University synthesized AgGaS with extremely uneven size and shape by hydrothermal method. 2 Nanocrystals; Professor Qian Xuefeng from Shanghai Jiaotong University synthesized AgGaS with relatively uniform size by solvothermal method 2 Nanocrystals, however, have an average size of around 50 nm, much larger than their Bohr radius, so there is no apparent quantum size effect
At present, there is no suitable chemical synthesis formula that can prepare AgGaS with a size of about 10-20 nanometers and uniform size and shape. 2 Nanocrystalline

Method used

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  • Synthetic method of nanometer AgGaS2 nonlinear optical crystal
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  • Synthetic method of nanometer AgGaS2 nonlinear optical crystal

Examples

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example 1

[0016] Example 1: Nanoscale AgGaS 2 Synthesis of nonlinear nanocrystals

[0017] In the first step, 0.5 mmol of silver nitrate and sulfur powder were dissolved in 10 ml of oleylamine respectively, and the two were mixed at a temperature of 60° C. and kept for 10 minutes. After the reaction, ethanol was added to precipitate the product, and the product Ag was centrifuged 2 S nanocrystals were isolated and collected.

[0018] In the second step, 0.2mmol of Ag 2 S nanocrystals, 0.5mmol of sulfur powder and gallium acetylacetonate were mixed in a mixed solution of 10ml of oleylamine, 2ml of mercaptan, 10ml of octadecene and 5ml of oleic acid; heated to 250°C under nitrogen as a protective atmosphere and kept for one Hours; after the reaction, add alcohol to the solution to precipitate the product, separate the product by centrifugation, and finally dry the product to form a powder.

[0019] The Ag obtained in the first step reaction 2 S nanocrystalline catalyst, its diameter ...

example 2

[0021] Example 2: Increase the reaction temperature of the second step to 280°C to synthesize nanoscale AgGaS 2 nonlinear nanocrystal

[0022] According to the formula in Example 1, the reaction temperature of the second step was raised to 280°C. Such as Figure 4 As shown, the synthesized AgGaS 2 Nonlinear nanocrystals still have a uniform pyramidal structure with a size of 15 nanometers.

example 3

[0023] Example 3: extend the reaction time of the second step to 2 hours, synthesize nanoscale AgGaS 2 nonlinear nanocrystal

[0024] According to the recipe in Example 1, the second step reaction time was extended to 2 hours. Such as Figure 5 As shown, the synthesized AgGaS 2 Nonlinear nanocrystals still have a uniform pyramidal structure with a size of 15 nanometers.

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Abstract

The invention provides a synthetic method of a nanometer AgGaS2 nonlinear optical crystal. The synthetic method provided by the invention is innovative by using nano Ag2S easy for nanometer synthesis as a seed and a catalyst, and the AgGaS2 nonlinear nanocrystal synthesized under the assistance of Ag2S has size of 15 nm and extremely uniform size and morphology. The material has both quantum size effect and nonlinear optical properties, and is an excellent nano optoelectronic material.

Description

Technical field: [0001] The invention relates to the fields of nano-synthesis, nonlinear optical crystals and semiconductors Background technique: [0002] AgGaS 2 It is a high-performance nonlinear optical crystal commonly used at present, and is often used in laser frequency doubling and mixing. Simultaneously AgGaS 2 It is also a direct bandgap semiconductor material with a forbidden band width of 2.7eV and a large excitonic Bohr radius. If AgGaS with nanoscale size can be synthesized 2 Crystals can exhibit more obvious quantum size effects, so as to obtain novel nonlinear photoelectric properties, such as efficient multi-order nonlinear optical frequency / photoelectric conversion performance. This is of great significance for the miniaturization and multifunctionalization of optoelectronic devices. [0003] At present, the use of chemical methods to synthesize high-purity AgGaS 2 This polysulfide nanomaterial has great difficulty. On the other hand, from the perspe...

Claims

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Application Information

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IPC IPC(8): C30B29/46C30B27/00G02F1/355
Inventor 黄烽周江聪王元生
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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