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Method for directly synthesizing lead sulfide cube nano particle film

A technology of nano-particles and lead sulfide, applied in the direction of lead sulfide, nanotechnology, nanotechnology, etc., can solve the problem of preparing thin films without lead sulfide nano-powders, and achieve easy control of preparation parameters, good repeatability, and simple process Effect

Inactive Publication Date: 2014-07-09
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent applications 02153758.5, 200610002147.X, 200810122106.3, 200810122109.7, 201010227752.3, 201210070266.4, etc. all disclose methods for synthesizing lead sulfide nanoparticles of different shapes using aqueous solution or mixed solution method; Further preparation of lead sulfide nanopowders into thin films
Moreover, the lead sulfide nanoparticles synthesized in the above patents in aqueous solution are usually difficult to disperse in organic solvents and evenly coated on the surface of the substrate for further film formation
[0004] According to the information retrieved, there is no report on the direct synthesis of lead sulfide cubic nano-films on the substrate surface by liquid phase method.

Method used

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  • Method for directly synthesizing lead sulfide cube nano particle film
  • Method for directly synthesizing lead sulfide cube nano particle film
  • Method for directly synthesizing lead sulfide cube nano particle film

Examples

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Embodiment 1

[0019] Mix 100ml 0.2mol / l sodium ethyl xanthate transparent solution with 100ml 0.1mol / l lead nitrate transparent solution, stir well to form a precipitate, filter, wash and dry to obtain lead ethyl xanthate powder; The lead xanthate powder was dissolved and dispersed in pyridine to form a 500 mg / ml homogeneous solution; the homogeneous solution of lead ethyl xanthate was spin-coated on a Si substrate, and annealed at a temperature of 300 °C under a nitrogen atmosphere for 10 minutes.

[0020] figure 1 It is the X-ray diffraction pattern of lead sulfide, which can confirm that it is lead sulfide with face-centered cubic structure.

[0021] figure 2 Scanning electron micrographs of lead sulfide thin films. It can be seen from the figure that the shape of the lead sulfide nanoparticles is a cube, and the size is about 50 nanometers.

Embodiment 2

[0023] Mix the transparent solution of 50ml 0.1mol / l potassium ethyl xanthate with the transparent solution of 50 ml 0.2mol / l lead acetate, stir well to form a precipitate, filter, wash and dry to obtain lead ethyl xanthate powder; Lead ethyl xanthate powder was dissolved and dispersed in pyridine to form a uniform solution of 10 mg / ml; the uniform solution of lead ethyl xanthate was drip-coated on Si wafers, and dried and annealed at 120°C for 100 minutes in an air atmosphere.

[0024] image 3 Scanning electron micrographs of lead sulfide thin films. It can be seen from the figure that the shape of the lead sulfide nanoparticles is a cube, and the size is about 30-70 nanometers.

Embodiment 3

[0026] Mix 30ml of 0.2mol / l sodium ethyl xanthate transparent solution with 30ml of 0.15mol / l lead acetate transparent solution, stir well to form a precipitate, filter, wash and dry to obtain lead ethyl xanthate powder; Dissolve and disperse lead xanthate powder in pyridine to form a uniform solution of 50 mg / ml; dip-coat the uniform solution of lead ethyl xanthate on a Si substrate, dry and anneal at a temperature of 200°C and an argon atmosphere for 70 minutes .

[0027] Figure 4 is a scanning electron micrograph of a lead sulfide thin film. It can be seen from the figure that the shape of the lead sulfide nanoparticles is a cube, and the size is about 30-150 nanometers.

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Abstract

The invention discloses a method for directly synthesizing a lead sulfide cube nano particle film. The method comprises the following specific steps of: 1, mixing deionized water transparent solution of sodium or potassium ethylxanthate with deionized water solution of lead nitrate or lead acetate, wherein the mol ratio of the sodium or potassium ethylxanthate to lead is 0.5-2, fully stirring uniformly to form a sediment, filtering, washing and drying to obtain lead ethylxanthate powder; 2, dissolving and dispersing the lead ethylxanthate powder in pyridine to form a uniform solution with a concentration of 10-500mg / ml; and 3, coating a lead ethylxanthate precursor solution on a substrate by adopting a rotary coating, drop-coating or dip-coating process, and annealing at a temperature of 120-300 DEG C for 10-100min. The method is simple in process, the preparation parameter is easily controlled, the repeatability is good, and the large-scale synthesis can be carried out, a large-area uniform lead sulfide cube nano particle film can be directly assembled on the substrate, and thus a multi-step complex process in a conventional synthesizing and assembling process is avoided.

Description

technical field [0001] The invention relates to a method for synthesizing nanocrystals and a controllable assembly of semiconductor nanomaterials, in particular to a method for directly synthesizing lead sulfide cubic nanocrystal particle films by a liquid phase method. Background technique [0002] Lead sulfide (PbS) is an important semiconductor material with an energy band gap of 0.41eV, a large excitonic Bohr radius (18nm), strong electron-hole pair confinement effect and large optical The nonlinear coefficient, whose quantum confinement effect is several times that of other semiconductor materials, is a typical material for studying quantum size effects. The energy band of nanoscale PbS blue shifts from the near-infrared to the visible light region, showing singular optical and electrical properties, and thus has important applications in many fields. It has been extensively studied for applications in nonlinear optical devices, infrared optical detectors, flexible sol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G21/21B82Y30/00
Inventor 王素梅赵旭荣
Owner SHANDONG UNIV
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