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A method for in-situ preparation of copper nanowires in microchannels

A copper nanowire, in-situ preparation technology, applied in nanotechnology, metal processing equipment, transportation and packaging, etc., can solve problems such as wide range, unclear interface, and no nanowire preparation

Active Publication Date: 2017-10-24
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are still two main problems in this method at present: (1) The two liquids used in this method are both miscible liquids (usually both liquids are aqueous solutions), and the solutes therein will diffuse each other, resulting in a gap between the two liquids. The formed interface is not sharp and has a wide range
However, they did not use the interfacial reaction between the immiscible solution-liquid two phases, but only used the steric confinement effect between the immiscible solutions to limit the area size of the microchannel coating, so the silver line width obtained was between 75 µm and 125 µm. in the µm range
[0005] To date, there are no literature reports on methods for in situ fabrication of nanowires in microchannels

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: the in-situ preparation method of copper nanowire in a kind of microchannel, it comprises the following steps:

[0020] 1) Preparation of reaction solution: Dissolve copper oleate in oleic acid at room temperature to make an oleic acid solution of copper oleate with a concentration of 1.7 mmol / L, which is the copper-containing oil phase solution; dissolve ascorbic acid in Ionized water is made into an aqueous solution of ascorbic acid with a concentration of 1 mol / L, which is a reducing aqueous phase solution;

[0021] 2) Select the microchannel and pretreat the wall surface of the microchannel: the microchannel used is the “Y” microchannel on the microfluidic chip, the width of the two inlet channels is 120 µm, the width of the main channel is 240 µm, and the channel The height of the channel is 10 μm, and the channel wall is PDMS; at room temperature, oleic acid is passed into the main channel for 3 hours, and the channel wall becomes an lipophilic surfa...

Embodiment 2

[0026] Embodiment 2: a kind of in-situ preparation method of copper nanowire in microchannel, it comprises the following steps:

[0027] 1) Preparation of reaction solution: 60 OUnder C, dissolve copper oleate in oleic acid to make an oleic acid solution of copper oleate with a concentration of 1.7 mmol / L, which is an oil phase solution containing copper; dissolve ascorbic acid in deionized water to make a concentration of The aqueous solution of 1 mol / L ascorbic acid is the reducing aqueous phase solution;

[0028] 2) Select the microchannel and pretreat the wall surface of the microchannel: the microchannel used is the “Y” microchannel on the microfluidic chip, the width of the two inlet channels is 120 µm, the width of the main channel is 240 µm, and the channel The height of the channel is 10 µm, and the channel wall is PDMS; 60 O Under C, oleic acid is passed into the main channel, and kept for 3 hours, the channel wall becomes an lipophilic surface;

[0029] 3) Format...

Embodiment 3

[0032] Embodiment 3: a kind of in-situ preparation method of copper nanowire in microchannel, it comprises the following steps:

[0033] 1) Preparation of reaction solution: Dissolve copper oleate in oleic acid at room temperature to make an oleic acid solution of copper oleate with a concentration of 1.7 mmol / L, which is the copper-containing oil phase solution; sodium hypophosphite Dissolve in deionized water to make an aqueous solution of sodium hypophosphite with a concentration of 1 mol / L, which is a reducing aqueous phase solution;

[0034] 2) Select the microchannel and pretreat the wall of the microchannel: the microchannel used is a "Y"-shaped capillary, the diameter of the two inlet channels is 50 µm, and the oil phase solution and the water phase solution are respectively passed through; the diameter of the main channel is 100 µm , the channel walls are all glass; at room temperature, oleic acid is passed into the main channel, and kept for 3 hours, the channel wall...

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Abstract

The invention provides a method for preparing copper nanowires in a microchannel by utilizing immiscible solution-liquid two-phase interface reaction, comprising: preparing immiscible oil phase solution and water phase solution, wherein one phase contains copper salt, and the other The phase contains a reducing agent; treat the wall of the microchannel to make the reaction product easy to grow and attach; control the flow parameters of the two phases to form a low-speed parallel flow in the microchannel; control the position of the two-phase liquid-liquid interface in the microchannel ; keep the position and shape of the interface stable, a chemical reaction occurs at the interface to generate copper, and copper nanowires are deposited on the channel wall at the interface position. The obtained nanowires have uniform transverse dimensions and the length is the same as the length of the channel forming the parallel flow, and the position of the generated copper wire in the microchannel is determined by the position of the two-phase interface and can be flexibly adjusted. The preparation method can directly prepare a patterned micro-nano structure in a microchannel, and has the advantages of low temperature, simplicity, good compatibility, low cost and strong practicability.

Description

technical field [0001] The invention relates to an in-situ preparation method of nanowires in a microchannel, specifically a method for in-situ preparation of copper nanowires on the wall surface of a microchannel by utilizing the immiscible solution-liquid two-phase parallel flow interface reaction in a microchannel . Background technique [0002] Various micro-nano structures, such as one-dimensional or two-dimensional or even three-dimensional wires or thin films in micron or nanoscale, are the basic units of microelectronic devices and microelectromechanical systems (MEMS). In the traditional micro-nano manufacturing process, the structure with a size of 1-10 μm is mainly prepared by a combination of thin film deposition, photolithography and etching, and the microstructure with a size of 10 μm or more is usually made of formed materials, such as wire, Wires, ribbons or balls, etc., are realized by precision welding. However, for microfluidic devices and systems, many ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00
CPCB82Y40/00B22F9/24B22F1/0547
Inventor 李宇杰王杰霍曜李迪
Owner HARBIN INST OF TECH AT WEIHAI
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