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In-situ preparation method of copper nanowires in microchannel

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

Active Publication Date: 2016-05-25
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 immiscible solution-liquid two phases, but only used the space confinement effect between immiscible solutions to limit the area size of the microchannel coating, so the obtained silver line width was in the range of 75 μm to 125 μm Inside
[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 1.7mmol / L, which is an oil phase solution containing copper; dissolve ascorbic acid in Ionized water is made into an aqueous solution of ascorbic acid with a concentration of 1mol / L, which is a reducing aqueous phase solution;

[0021] 2) Select the microchannel and pretreat the wall of the microchannel: the microchannel used is the "Y" microchannel on the microfluidic chip, the width of the two entrance channels is 120 μm, the width of the main channel is 240 μm, and the height of each channel is Both are 10 μm, and the channel walls are all PDMS; at room temperature, oleic acid is passed into the main channel for 3 hours, and the channel wall becomes a lipophilic surface, s...

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 O Under C, dissolve copper oleate in oleic acid to make a concentration of oleic acid solution of copper oleate of 1.7mmol / L, which is the copper-containing oil phase solution; dissolve ascorbic acid in deionized water to make a concentration of The aqueous solution of 1mol / L ascorbic acid is the reducing aqueous phase solution;

[0028]2) Select the microchannel and pretreat the wall of the microchannel: the microchannel used is the "Y" microchannel on the microfluidic chip, the width of the two entrance channels is 120 μm, the width of the main channel is 240 μm, and the height of each channel is Both are 10 μm, and the channel walls are all 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) Formation and...

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 1.7mmol / 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 1mol / 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, and the diameters of the two inlet channels are both 50 μm, which respectively pass into the oil phase solution and the water phase solution; the diameter of the main channel is 100 μm, and the channel The walls are all glass; at room temperature, oleic acid is passed into the main channel for 3 hours, and the wall of t...

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Abstract

The invention provides a method for preparing copper nanowires in a microchannel in situ by virtue of insoluble liquid-liquid two-phase interface reaction. The method comprises the following steps: preparing an oil phase solution and an aqueous phase solution which are mutually insoluble, wherein one phase contains copper salt and the other phase contains a reducing agent; treating a microchannel wall surface so that a reaction resultant can easily grow on and adhere to the microchannel wall surface; controlling flow parameters of the two phases so as to enable the two phases to form a low-speed parallel flow in the microchannel; controlling the position of a two-phase liquid-liquid interface in the microchannel; and keeping the stability of the position and the form of the interface, performing chemical reaction at the interface to generate copper, and depositing on the channel wall surface at the interface position to form the copper nanowires. The obtained copper nanowires are uniform in transverse size, and are as long as the channel in which the parallel flow is formed; and the positions of the generated copper nanowires in the microchannel are determined by the position of the two-phase interface and can be flexibly adjusted. By the preparation method, a graphical micro-nano structure can be directly prepared in the microchannel; and the preparation method is low in temperature, simple, good in compatibility, low in cost and high in practicality.

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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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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