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Compositions and methods for growing copper nanowires

A copper nanowire and copper nanotechnology, applied in the fields of nanotechnology, nanotechnology, nanostructure manufacturing, etc., can solve the problems of inefficient processing, high cost, and carbon nanotube films are not comparable to ITO.

Inactive Publication Date: 2012-11-21
DUKE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The lack of flexibility, inefficient processing, and high cost of ITO thin films drive the search for alternatives
Films of carbon nanotubes have been intensively studied as a possible alternative, but films of carbon nanotubes have not yet matched the properties of ITO (Kaempgen 2005, Lagemaat 2006)

Method used

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  • Compositions and methods for growing copper nanowires
  • Compositions and methods for growing copper nanowires
  • Compositions and methods for growing copper nanowires

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Cu(NO 3 ) 2 Copper nanowires were synthesized by reduction. For scale-up responses ( figure 1 ), 2000mL 15M NaOH, 100mL 0.2M Cu(NO 3 ) 2 , 30 mL EDA, and 2.5 mL 35 wt% hydrazine were added to the reaction flask and the reactants were mixed by hand swirling for 20 seconds after each addition. The solution was heated at 80°C and stirred at 200 rpm for 60 minutes. After 20 minutes, the solution changes from indicating Cu 2+ Ionic Royal Blue ( figure 1 A) Turns to a reddish-brown color indicating CuNW formation ( figure 1B). This reaction yielded 1.2 g of CuNWs. After the reaction, the CuNWs were washed with a 3 wt% aqueous solution of hydrazine and stored in the same hydrazine solution at room temperature under an argon atmosphere to minimize oxidation.

[0067] figure 1 C shows the scanning electron microscope (SEM, FEI XL30) image of the reaction product, which is composed of CuNWs with a diameter of 90 ± 10 nm. The inset shows a close-up of the wire showing ...

Embodiment 2

[0076] Method - General Approach: This disclosure describing specific procedures provides a method for producing long, well-dispersed copper nanowires. A major problem with existing methods of synthesizing copper nanowires is that newly formed nanowires aggregate and adhere to each other, resulting in the formation of clumps. When these agglomerates are incorporated into films, it results in poor clarity. described herein and Figure 7 The method generally shown in addresses this issue by separating the seed nucleation and wire growth processes into two steps. While not wishing to be bound by theory, it is believed that by adding surfactant immediately after nucleation of the seeds, aggregation of the nanowires is prevented during the growth phase.

[0077] In one embodiment, the scaled-up reaction yielded about 60 mg of CuNWs (percent conversion = 93%). Clean the 1000 mL round bottom flask with nitric acid and rinse it several times to ensure it is clean. The flask was th...

Embodiment 3

[0100] developed another synthesis that resulted in CuNWs with a diameter of about 50 nm and many nanowires with a length of more than 20 μm.

[0101] Clean the flask and stir bar with concentrated nitric acid, rinse well with DI water, and dry in an 80 °C oven before use. Once dry, the flask was allowed to cool to room temperature before adding any reactants.

[0102] By adding NaOH (20mL, 15M), Cu(NO 3 ) 2 (1 mL, 0.1 M), EDA (0.15 mL) and hydrazine (0.025 mL, 35% by weight) were added to a 50 mL round bottom flask to synthesize CuNWs. The solutions were swirled by hand for 5 seconds after each addition to mix the reactants. The solution was then heated at 80°C and stirred at 200 rpm for about 3 minutes. After the reaction, the solution was poured into a 50 mL centrifuge tube, and PVP and an aqueous solution (20 mg PVP in 5 mL of water) were gently added on top of it. The reaction solution and the PVP solution were mixed, and then placed in an ice bath. The solution was...

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Abstract

A method of synthesis to produce gram-scale quantities of copper nanowires in an aqueous solution, wherein the copper nanowires are dispersed in said solution. Copper nanowires grow from spherical copper nanoparticles within the first 5 minutes of the reaction. Copper nanowires can be collected from solution and printed to make conductive films (preferably <10,000 [omega] / sq) that preferably transmit greater than 60% of visible light.

Description

technical field [0001] The present disclosure generally relates to the field of copper nanowires. In particular, the present disclosure relates to copper nanowire structures, copper nanowire dispersion compositions, and methods of making the copper nanowires. Background technique [0002] Transparent conductors are used in a wide variety of applications, including low-e windows, flat panel displays, touch-sensitive control panels, solar cells, and for electromagnetic shielding (Gordon 2000). The flat panel display market alone is worth approximately $90 billion annually. Display manufacturers prefer to use indium tin oxide (ITO) as a transparent conductor because it can be used at relatively low temperatures and it is easier to etch than materials with comparable conductivity and transmittance (Gordon 2000). It can be made into an ITO film with a sheet resistance of 10Ω / sq that transmits about 90% of visible light (Chopra 1983). Limitations of ITO include the fact that a)...

Claims

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Application Information

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IPC IPC(8): H01B1/02H01B1/22H01B5/14B82B3/00B22F1/0545C09D7/61
CPCC09D7/1275B22F9/24B22F2001/0037C09D11/52H01B1/026B22F1/0025C08K2003/085C08K7/06C09D5/24B22F1/0022C08K9/02C09D7/1291C08K7/18B22F2999/00H01L51/442B22F7/04B82Y30/00C09D7/68C09D7/70Y10T428/298C09D7/61B22F1/0553B22F1/0547B22F1/0545H10K30/82B22F3/002B22F1/054B22F1/056B22F1/065H01B1/02H01B1/22H01B5/14B82B3/00
Inventor 本杰明·维利阿隆·拉特米尔
Owner DUKE UNIV
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