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Core-shell structure copper nanoparticle and preparation method thereof

A core-shell structure and copper nanotechnology, applied in the field of nanomaterials, can solve the problems of expensive Ag, easy oxidation of nano-copper particles, and unsuitability for large-scale industrial production.

Active Publication Date: 2014-06-18
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Ag is expensive and is not suitable for large-scale industrial production. Metal Cu is expected to become a substitute for silver due to its good electrical and thermal conductivity and low cost. However, the defect of easy oxidation of nano-copper particles greatly limits its application.

Method used

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  • Core-shell structure copper nanoparticle and preparation method thereof
  • Core-shell structure copper nanoparticle and preparation method thereof
  • Core-shell structure copper nanoparticle and preparation method thereof

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preparation example Construction

[0031] see figure 1 , a method for preparing copper nanoparticles with a core-shell structure includes the following steps S110 and S120.

[0032] Step S110: Prepare an alkaline solution containing a copper precursor and a protective agent, add a reducing agent to obtain a first mixture, and react the first mixture at 10°C to 80°C for 5 minutes to 60 minutes to obtain a nano-copper hydrosol. The copper hydrosol is separated and purified to obtain copper nanopowder.

[0033] The operation of preparing the alkaline solution containing copper precursor and protective agent is as follows:

[0034] The copper precursor and the protective agent are dissolved in a solvent, and an alkaline substance is added to obtain an alkaline solution containing the copper precursor and the protective agent. The solvent is preferably water.

[0035] The copper precursor is selected from at least one of copper sulfate, copper chloride, copper nitrate, copper acetate and copper hydroxide.

[003...

Embodiment 1

[0056] Into a 1000mL three-necked flask, add 300ml H 2 O, 10g Cu(OH) 2 , 10mLNH 3 ·H 2 O and 0.5g PVP to obtain an alkaline solution containing a copper precursor and a protective agent, then add 7mL mass fraction 80% hydrazine hydrate to obtain the first mixture, and react the first mixture at 50°C for 10min to obtain a brown-red nano-copper hydrosol , and then suction-filter, wash and dry the nano-copper hydrosol to obtain copper nano-powder. 5ml NH 3 ·H 2 O is added in the 200ml ethanol solution and is mixed with the ethanol solution that contains ammoniacal liquor, takes by weighing 6.6g copper nanopowder, is joined in the ethanol solution that contains ammoniacal liquor, then adds the 100ml ethanol solution that contains 20ml tetraethyl orthosilicate, The second mixture was obtained, and the second mixture was hydrolyzed and condensed at 50°C for 4 hours to obtain dark reddish-brown CuSiO 2 Hydrosol. The aqueous sol was suction filtered, washed, and vacuum-dried to...

Embodiment 2

[0060] Into a 1000mL three-necked flask, add 300ml H 2 O, 24.8g Cu(NO 3 ) 2 ·3H 2 O, 15mLNH 3 ·H 2 O and 0.5g PVP to get an alkaline solution containing copper precursor and protective agent, then add 3.88g NaBH 4 The first mixture was obtained, and the first mixture was reacted at 20° C. for 5 minutes to obtain a brown-red nano-copper hydrosol, and then the nano-copper hydrosol was suction-filtered, washed, and dried to obtain a copper nano-powder. 10mlNH 3 ·H 2 O was added to 200ml ethanol solution to prepare an ethanol solution containing ammonia, weighed 5g of nano-copper powder and added it to the ethanol solution containing ammonia, and then added 100ml ethanol solution containing 10ml γ-aminopropyltriethoxysilane , to obtain the second mixture, the second mixture was hydrolyzed and condensed at 60°C for 8h to obtain dark reddish brown CuSiO 2 Hydrosol. The aqueous sol was suction filtered, washed, and vacuum-dried to obtain CuSiO with a core-shell structure. 2...

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Abstract

The invention relates to a core-shell structure copper nanoparticle and a preparation method thereof. The core-shell structure copper nanoparticle comprises a copper core and a silicon dioxide shell covering the surface of the copper core, wherein the grain diameter of the copper core is 40-450 nanometers; the thickness of the silicon dioxide shell is 5-50 nanometers. The silicon dioxide shell is capable of effectively preventing oxygen in air from permeating, the oxidation of the copper core is prevented, and the core-shell structure copper nanoparticle has excellent oxidation resistance.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a copper nanoparticle with a core-shell structure and a preparation method thereof. Background technique [0002] As the feature size of integrated circuits enters the nanometer level, the packaging form of integrated circuit products has also transitioned from two-dimensional to three-dimensional, and is developing towards a higher density. In order to meet the requirements of modern packaging technology for packaging materials, it has become an inevitable trend to apply nano-materials to the field of electronic packaging, and metal-based nanocomposites have gained more and more attention due to their high thermoelectric physical properties and good packaging performance. s concern. [0003] At present, the application of nano-metal particles in the field of electronic packaging mainly includes the following aspects: (1) Conductive metal particles are used to increase the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/24B22F9/16
Inventor 孙蓉李刚于淑会
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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