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Physical preparation method of nano-lead and cadmium sulfide material

A lead cadmium sulfide and nanotechnology, applied in the direction of lead sulfide, cadmium sulfide, nanotechnology, etc., can solve the problem of uneven composition of nanocrystals, and achieve the effect of easy-to-obtain raw materials, uniform chemical composition, and single structure

Inactive Publication Date: 2013-10-09
WUHAN UNIV OF TECH
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Problems solved by technology

In addition, Cd prepared by wet chemical method 1-x Pb x The lattice parameters of S nanocrystals hardly change with the value of x, indicating that the chemically prepared Cd 1-x Pb x The composition of S nanocrystals is not uniform, and there is no single-phase structure of Cd 1-x Pb x S nanocrystalline

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  • Physical preparation method of nano-lead and cadmium sulfide material
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[0024] In the following, the present invention will be further described in conjunction with the preparation examples and spectra of the samples.

[0025] The preparation method of nano lead cadmium sulfide material comprises the following steps:

[0026] 1) The mixture of high-purity cadmium, lead and sulfur powder is sealed in a ball mill jar as a raw material, and the molar ratio of the sum of cadmium and lead to sulfur is (1±0.1):(1±0.1), while cadmium and lead The molar ratio is any value from 0 to 1, and ball mills of different diameters are loaded into the ball mill tank at the same time;

[0027] 2) Put the sealed ball milling tank in the glove box, then open the ball milling tank cover, and fill the ball milling tank with inert gas to remove the oxygen in the raw materials;

[0028] 3) Install the sealed ball mill tank on the ball mill to start ball milling, so that the element powder is mechanically alloyed into the desired semiconductor compound or nanocrystal;

...

Embodiment 1

[0038]CdS nanocrystals were prepared by mechanical alloying, that is, x=0, and the samples were weighed according to the stoichiometric ratio of CdS. In order to avoid excessive Cd, the atomic ratio of Cd to S was set to 0.46:0.54, and then the elements Cd and S powder were weighed 11.2371g and 3.7628g each, the weighing error is ±0.0002g, the purity of high-purity cadmium and sulfur is 99.9% (the same below), put the weighed samples into ball mill jars with ball mills of different diameters And sealed, the diameter of the ball mill is 2-12 mm, the mass ratio of the ball mill to the raw material is set to 1:1~10:1, put it in the glove box, open the ball mill tank cover, and fill the ball mill tank with inert gas for 30 minutes , to remove the oxygen in the raw material, take it out after sealing, load it on the ball mill (SPEX8000) of SPEX SpamplePrep Company in the United States for ball milling, and ball mill for 1 to 40 hours, so that the element powder can completely react ...

Embodiment 2

[0040] Preparation of Cd by Mechanical Alloying 0.5 Pb 0.5 S nanocrystals, that is, x=0.5; Weigh 4.3939g, 8.0992g and 2.5067g of elemental Cd, Pb and S powder respectively, keep the weighing error within the range of ±0.0002g, place the weighed sample in the There are ball mill jars with different diameters and sealed. The diameter of the ball mill is 2-12 mm. The mass ratio of the ball mill to the raw material is set at 1:1 to 10:1. Put it in the glove box and open the lid of the ball mill jar. Fill the ball mill tank with inert gas for 30 minutes to remove the oxygen in the raw materials, seal it and take it out, load it on the ball mill (SPEX8000) of SPEX SpamplePrep Company in the United States for ball milling, and ball mill for 15 minutes, 30 minutes, 60 minutes, 2 hours, 5 hours, 10 hours, 20 hours, 40 hours, the samples of different ball milling times should be sampled in the glove box for structural and optical performance tests to avoid oxidation. XRD tests were ca...

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Abstract

The invention relates to a physical preparation method of nano-material lead and cadmium sulfide. The physical preparation method comprises the following steps of: taking a mixture of high-purity cadmium, lead and sulfur element powder as a raw material, and sealing in a ball milling tank, wherein the molar ratio of the sum of the cadmium and the lead to the sulfur is (1 plus or minus 0.1): (1 plus or minus 0.1), the molar ratio of the cadmium to the lead is an any value from 0 to 1, and ball mills with different diameters can be simultaneously arranged in the ball milling tank. The physical preparation method disclosed by the invention has the beneficial effects that the prepared lead and cadmium sulfide nano-crystal has uniform chemical components and single structure, the lattice constant and energy gap of the synthesized nano-crystal can be continuously adjusted, and the energy gap can be continuously tuned from near-infrared (1060nm) to mid-infrared (2638nm). The physical preparation method disclosed by the invention has the advantages of simple preparation process, easiness in obtaining the raw material, cheap price, environmental friendliness, capability of realizing large-batch production and the like.

Description

technical field [0001] The invention belongs to the field of preparation of nanomaterials, in particular to a nanomaterial cadmium lead sulfide (Cd 1-x Pb x S) physical preparation method. Background technique [0002] In the past two decades, semiconductor nanostructures have attracted increasing attention due to their unique size-dependent optical properties and potential for a wide range of applications. Alloying binary semiconductor materials into ternary alloys can form a new class of semiconductors. The lattice parameters, energy gap widths, and other physical performance parameters of this type of semiconductors can be continuously tuned by changing the chemical composition within a specific range. [0003] In recent years, PbS has received much attention. PbS transition band gap energy is very narrow (E g =0.27eV), the excitonic Bohr radius is large (18nm), some scholars have alloyed it with other binary sulfides by chemical methods to form a ternary semiconducto...

Claims

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Application Information

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IPC IPC(8): C01G11/02C01G21/21B82Y30/00
Inventor 谭国龙刘丽敏
Owner WUHAN UNIV OF TECH
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