Metal-containing nanoparticles, their synthesis and use

A technology of metal alloys and particles, which is applied in the field of metal-containing nanoparticles, its synthesis and application, and can solve the problems of poor crystallization of metal cores, limitations, time-consuming scale, etc.

Inactive Publication Date: 2009-08-05
CABOT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, uncoated metal nanoparticles often suffer from the problem that they tend to agglomerate into larger micron-sized aggregates which may, for example, be no longer suitable for use in inkjet printing
However, the overall synthesis is complex, time-consuming and limited in scale, and produces nanoparticles in which the metal core is poorly crystallized and the surface coating tends to contain covalently bound carbon (either directly or via other metals) formed in the Residues of organic substances used in synthesis or to stabilize metal particles

Method used

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  • Metal-containing nanoparticles, their synthesis and use
  • Metal-containing nanoparticles, their synthesis and use
  • Metal-containing nanoparticles, their synthesis and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8

[0116] Silver neodecanoate and hexamethyldisiloxane (HMDS) were premixed in toluene in different amounts to make various Ag / SiO with between 5 / 95 and 98 / 2 2 Test solutions by weight ratio (see Table 1 below). Each solution was dispersed in an oxygen dispersing gas flowing at 40 slpm and supplied to the laboratory at a rate of 10 ml / min Figure 4-6 The reactor shown in is similar to the flame jet reactor. The ignition source for the reactor was a pilot flame fueled by methane fed at 2 slpm and oxygen fed at 4 slpm, while the fuel for the burner was provided by precursors (silver neodecanoate and hexamethyldisiloxane) and toluene carrier . Additionally, the reactor included an oxygen jacket provided at 200 slpm and an oxygen quench medium provided at 900 slpm. Nozzle tip diameter ( Figure 4 δ) in is 0.5mm.

[0117] The resulting product was collected on a baghouse filter and analyzed using transmission electron microscopy (TEM), scanning transmission electron microscopy (S...

Embodiment 9

[0129] Ag:SiO was fabricated using the same steps as in Examples 1-8 above 2 Granules in weight ratios of 90:10, 98:2, 99:1 and 99.5:0.5. The first three materials (90:10, 98:2, 99:1 ) were readily dispersible in water and QEL's measurements showed an average particle size of ~100 nm. However, the 99.5:0.5 material was not readily dispersible and QELS measurements showed the presence of particles larger than 100 microns as well as particle populations around 100 nm. This implies that some of the silver grains produced by this method are covered by SiO 2 coated, which prevents their aggregation. However, other Ag particles are not sufficiently (or not at all) coated with SiO 2 , which causes them to aggregate or agglomerate into larger particles that settle rapidly when dispersed. Figure 20(a) and (b) show TEM images of the 99.5:0.5 material—some particles appear to be coated with very thin SiO 2 layers while others are fused together.

Embodiment 10

[0130] Embodiment 10 (comparison)

[0131] The following examples describe two metal / metal oxide material systems that did not result in coated metal particles. Silver neodecanoate and zinc ethylhexanoate precursors were premixed in toluene in different amounts to make test solutions with various Ag / ZnO weight ratios between 90 / 10 and 95 / 5. Each solution was dispersed in an oxygen dispersing gas flowing at 40 slpm and supplied to the laboratory at a rate of 10 ml / min Figure 4-6 The reactor shown in is similar to the flame jet reactor. The ignition source for the reactor was a pilot flame fueled by methane fed at 2 slpm and oxygen fed at 4 slpm, while the fuel for the burner was provided by precursors (silver neodecanoate and zinc ethylhexanoate) and toluene carrier. Additionally, the reactor included an oxygen jacket provided at 200 slpm and an oxygen quench medium provided at 900 slpm. The nozzle tip diameter is 0.5 mm.

[0132] The resulting product was collected on a b...

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Abstract

A powder batch is described comprising single crystal metal-containing particles having a crystal size of less than 50nm as measured by X-ray diffraction and having a weight average particle size of from about 10 nanometers to less than 100 nanometers as measured by transmission electron microscopy and including a continuous or non-continuous coating of a ceramic material. The powder batch is preferably produced by flame spraying.

Description

technical field [0001] The present invention relates to metal-containing nanoparticles, their synthesis and their use. Background technique [0002] Metal-containing nanoparticles are particles that contain a metal or metal alloy and have an average particle diameter of about 1 nanometer to less than 1000 nanometers. Such particles have various potential applications, for example in the production of electrical conductors for electronic devices, where, for example, silver nanoparticles can be coated on a substrate, for example by inkjet printing, and then cooled at temperatures significantly below the melting point of bulk silver. sintering to produce the desired conductor. [0003] Although nano-sized metal particles have significant utility without modification, their performance can often be enhanced by adding a surface coating of polymeric materials or ceramic materials such as metal oxides. For example, uncoated metal nanoparticles often suffer from the problem that t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/28B22F9/30B22F1/054B22F1/16
CPCB42D2033/10B22F1/02B22F9/30C03C12/00H01L31/022425Y02E10/50B22F1/0018B22F9/28B82Y30/00Y10T428/2995Y10T428/12181Y10T428/256Y10T428/2991Y10T428/2998B22F1/054B22F1/16B22F1/056H01L31/04H01L31/0224B42D25/373
Inventor 托伊沃·T·柯达斯米奥德拉格·奥尔杰卡马克·J·汉普登-史密斯乔治·P·福图拉尔夫·E·科恩布里克沈建平
Owner CABOT CORP
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