Aqueous-phase synthesis method of Cu-doped Zn1-xCdxS quantum dot and core/shell structure thereof

A technology of zn1-xcdxs and quantum dots, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of biological application limitations, inability to directly apply biological imaging, high reaction temperature, etc.

Inactive Publication Date: 2013-12-11
GUIZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the economic cost of synthesizing the quantum dots in the organic phase is high, and the reaction conditions are relatively harsh, requiring a high reaction temperature, which inevitably causes large energy consumption and is not suitable for industrial scale production.
Since the quantum dots are prepared in the organic phase, the pro...

Method used

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  • Aqueous-phase synthesis method of Cu-doped Zn1-xCdxS quantum dot and core/shell structure thereof
  • Aqueous-phase synthesis method of Cu-doped Zn1-xCdxS quantum dot and core/shell structure thereof
  • Aqueous-phase synthesis method of Cu-doped Zn1-xCdxS quantum dot and core/shell structure thereof

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Experimental program
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Effect test

Embodiment 1

[0022] The reaction solution of sulfur powder and sodium borohydride was used as the sulfur source stock solution, zinc acetate, copper chloride, and cadmium acetate were used as the zinc ion source, copper ion source, and cadmium ion source respectively, and mercaptopropionic acid was used as the mercapto compound to prepare Cu :Zn 1-x Cd x Cu:Zn with core-shell structure formed by S quantum dots and further encapsulation of ZnS 1-x Cd x S / ZnS core / shell quantum dots.

[0023] Step (a): Accurately measure 12 ml of deionized water in the polyethylene liner, add sodium hydroxide to adjust the pH value to 8.5, add 0.0384 g of sulfur powder and 0.15 g of sodium borohydride, and put the polyethylene liner into Just put the kettle on and tighten the lid, react at 180°C for 2 hours, flush with water to cool down, and then make the sulfur source stock solution.

[0024] Step (b): Dissolve 0.104 g of zinc acetate in 4 ml of deionized water, add 0.026 ml of mercaptopropionic acid a...

Embodiment 2

[0029] Example 2 is the same as Example 1, except that the sulfur source stock solution in Example 1 is replaced by a sulfur source stock solution made by dissolving 0.0936 grams of sodium sulfide in 12 milliliters of deionized water.

Embodiment 3

[0031] Embodiment 3 is the same as Embodiment 1, except that the sulfur source stock solution in Embodiment 1 is replaced by directly adopting 0.0152 grams of thiourea as the sulfur source.

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Abstract

The invention discloses an aqueous-phase synthesis method of a Cu-doped Zn1-xCdxS quantum dot and a core/shell structure thereof. The method comprises the following steps of directly dissolving cadmium ion sources, copper ion sources and zinc ion sources into water, adding a stabilizer, namely sulfhydryl compound, adding a sulfur source under a certain pH value and heating under the protection of inert gases to prepare the Cu-doped Zn1-xCdxS quantum dot; jacketing the Cu-doped Zn1-xCdxS quantum dot with ZnS through a secondary injection method to obtain a Cu:Zn1-xCdxS/ZnS core/shell quantum dot. The method has the advantages of low cost, good operability, good repeatability and low requirements on equipment conditions. The Cu:Zn1-xCdxS/ZnS core/shell quantum dot prepared by the method has excellent luminescence property and good fluorescence stability, is suitable for optoelectronic devices such as solid state lighting, solar cells, displays and the like and is also suitable for being widely applied in bio-labeling, imaging and the like due to good water solubility.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a Cu-doped Zn 1-x Cd x Aqueous Phase Synthesis of S(0≤x≤1) Quantum Dots and Their Core / Shell Structures. Background technique [0002] Quantum dots can also be called semiconductor nanocrystals. The particle size is generally between 1 and 10nm, and the quantum effect is obvious, which leads to its physical and chemical properties that are different from microscopic atoms and molecules, and different from macroscopic objects. Between microscopic and macroscopic objects, it shows many unique properties and laws different from traditional materials. Such as quantum confinement effect, small size effect, surface effect, tunnel effect, dielectric confinement effect, etc. At the same time, quantum dots have important application value in biology, optoelectronic functional devices and quantum light-emitting devices. By introducing impurities into the lattice of semi...

Claims

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Application Information

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IPC IPC(8): C09K11/56C09K11/02B82Y30/00B82Y40/00
Inventor 曾若生沈荣安孙智国
Owner GUIZHOU NORMAL UNIVERSITY
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