Nanoparticles, methods of making, and applications using same

A nano-particle, reactive technology, applied in the field of nano-particles, its preparation and use, can solve the problem of phase transfer catalyst toxicity, etc., and achieve the effect of good monodispersity, short processing time and low annealing temperature

Inactive Publication Date: 2009-07-08
NANOMAS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, some phase transfer catalysts can be toxic

Method used

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  • Nanoparticles, methods of making, and applications using same
  • Nanoparticles, methods of making, and applications using same
  • Nanoparticles, methods of making, and applications using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0161] Synthesis of embodiment 1.Ag nanoparticles:

[0162] 3.34 g of silver acetate and 37.1 g of dodecylamine were dissolved in 400 ml of toluene. 1.51 g of sodium borohydride (NaBH 4 ) was dissolved in 150ml of water. NaBH was added via dropping funnel over a period of 5 minutes 4 The solution was added dropwise to the reaction flask while stirring. Stirring was continued and stopped for the 2.5 hour reaction. The solution was allowed to settle into two phases. The aqueous phase was removed through a separator funnel, followed by removal of toluene from the solution using a rotary evaporator resulting in a very thick paste. 250ml of 50 / 50 methanol / acetone was added to precipitate the Ag nanoparticles. The solution was filtered through a fine sintered glass funnel, and the solid product was collected and dried under vacuum at room temperature. 2.3 to 2.5 g of product were obtained as a dark blue solid. Nanoparticles have been detected by TEM ( figure 1 ) of 4nm to 5...

Embodiment 2

[0163] Embodiment 2. Synthesis of zinc oxide nanoparticles:

[0164] 6.3 grams of zinc stearate [Zn(C 18 h 35 o 2 ) 2 ] and 10 grams of cetylamine were dissolved in 400ml of toluene. 1.2 grams of potassium hydroxide (KOH) was dissolved in 150 ml of water. The KOH solution was added dropwise to the reaction flask via the dropping funnel over a period of 5 minutes while stirring. Stirring was continued and stopped for the 2 hour reaction. The aqueous phase was removed through a separator funnel, followed by a rotary evaporator to remove toluene from the solution. 250ml of 50 / 50 methanol / acetone was added to precipitate the zinc oxide nanoparticles. The solution was filtered through a fine sintered glass funnel, and the solid product was collected and dried under vacuum at room temperature. About 0.8 g of white solid product was obtained. Nanoparticles have been detected by TEM( Image 6 ) detected size of about 7.4nm (with a small number of ZnO nanoneedles present).

Embodiment 3

[0165] Example 3. Coated conductive films from sintered silver nanoparticles:

[0166] A cyclohexane solution with a content of 10% to 20% by weight of the Ag nanoparticles synthesized in Example 1 was prepared, and it was spin-coated on a clean glass substrate at about 1500 rpm to produce a thickness of 0.1 Micron to 0.3 micron nanoparticle coated film. The nanoparticle film was heated to a temperature in the range of 90°C to 180°C for 10 minutes, while the color of the film changed from dark brown to bright silver. The conductivity of the sintered silver films was measured by a four-point probe instrument. The results are listed in Table 2. It demonstrates that films sintered at sintering temperatures above 150° C. have excellent electrical conductivity, which reaches about 70% of pure silver.

[0167] Table 2

[0168] Annealing temperature (℃) Resistivity (ohm-cm) 90

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Abstract

Methods for forming nanoparticles under commercially attractive conditions. The nanoparticles can have very small size and high degree of monodispersity. Low temperature sintering is possible, and highly conductive films can be made. Semiconducting and electroluminescent films can be also made. One embodiment provides a method comprising: (a) providing a first mixture comprising at least one nanoparticle precursor and at least one first solvent for the nanoparticle precursor, wherein the nanoparticle precursor comprises a salt comprising a cation comprising a metal; (b) providing a second mixture comprising at least one reactive moiety reactive for the nanoparticle precursor and at least one second solvent for the reactive moiety, wherein the second solvent phase separates when it is mixed with the first solvent; and (c) combining said first and second mixtures in the presence of a surface stabilizing agent, wherein upon combination the first and second mixtures phase-separate and nanoparticles are formed.

Description

[0001] related application [0002] This application claims priority to US Provisional Application Serial No. 60 / 791,325, filed April 12, 2006, which is incorporated herein by reference in its entirety. Background technique [0003] Various applications in various industries including biotechnology, diagnostics, energy and electronics require new and better nanostructured materials. For example, electronic device manufacturers are constantly striving to reduce costs and increase the functionality of electronic devices and components. One emerging strategy for reducing costs is to use solution-based inks to print electronics directly onto low-cost plastic films. The so-called printed electronic device refers to the use of methods already used in the printing industry (such as inkjet printing, gravure printing, screen printing, flexographic printing, off-set printing, etc.) High-volume and low-cost reel-to-reel (R2R) technology for manufacturing functional electronic devices. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00C01B13/32C01G9/02
CPCC01P2002/84C01G1/02B22F9/24C01P2002/88B22F2998/00C01P2004/64C01P2006/40C09C1/043B82Y30/00B22F1/054B82B3/00C01G9/02C01B13/32
Inventor 叶仁浩王浩徐志勇
Owner NANOMAS TECH
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