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Method and device for in-situ assembly of one-dimensional nano materials

A technology of nanomaterials and in-situ assembly, applied in nanocarbon, carbon nanotubes, nanotechnology, etc., can solve problems that are difficult to distinguish with the naked eye, uncontrollable shape, and affect the performance of subsequent devices, and achieve the effect of avoiding material damage

Active Publication Date: 2017-11-10
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the extremely small scale of one-dimensional nanomaterials in the radial direction, it is difficult to distinguish with the naked eye, and it must be visualized with the help of an electron microscope or precise optical characterization, which brings great inconvenience to its manipulation.
Although a set of technologies for optical visualization and manipulation has been developed by loading particles on the surface of one-dimensional nanomaterials, the introduction of particles will inevitably affect the performance of subsequent devices, and the process of removing particles will cause structural defects in the material.
In comparison, the construction of multilevel networks of one-dimensional nanomaterials using in-situ preparation methods is a non-destructive method, but limited by the growth mode of materials, the current construction types of one-dimensional nanomaterials obtained by in-situ preparation methods are relatively single. And the shape is uncontrollable, and the slightly complicated construction method needs to go through multiple material growth processes, which increases the cost of time and money

Method used

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  • Method and device for in-situ assembly of one-dimensional nano materials

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Embodiment approach

[0053] combine Figure 1 to Figure 4 As shown, the present invention provides a method for in-situ assembly of one-dimensional nanomaterials, which comprises the steps of:

[0054] S1. Set the growth substrate for pushing one-dimensional nanomaterials on the substrate or boat 3, wherein the substrate or boat 3 is connected to the internal magnet 4, and each component is integrally arranged inside the reactor 5 of the tubular heating furnace 2;

[0055] S2. During the preparation process, the motor 13 drives the slide rail 9 suspended with the external magnet 7 to move linearly outside the reactor 5 through the transmission mechanism, and the magnetic force between the external magnet 7 and the internal magnet 4 is used to control the substrate. Or the moving speed of the boat 3 in the reactor 5;

[0056] S3. By changing the moving speed of the external magnet 7 during the growth stage of the one-dimensional nanomaterial or adjusting the initial setting of the growth substrate t...

Embodiment 1

[0063] Example 1: Winding and breaking of a single ultra-long carbon nanotube

[0064] (1) will press with 0.03M FeCl 3 Catalyst Si / SiO in ethanol solution 2 (800nm ​​oxide layer) rectangular strip growth substrate is placed in the quartz boat 3 and placed in the reactor 5 of the tubular heating furnace 2 .

[0065] (2) Feed 200 sccm of argon and hydrogen mixture (Ar:H2=1:2, v / v) into the reactor 5 as a protective gas, and start to heat up, when the temperature rises to 900-1010°C , constant temperature for 20min. Then enter the reaction stage, feed 180sccm methane and hydrogen gas mixture (H2:CH4=2:1, v / v), start ultra-long carbon nanotube preparation reaction, recorded as t=0 time. When t=10-20min, turn on the controller 10 to control the stepping motor 13, so that the slide rail 9 moves in the opposite direction to the reaction air flow at a speed of 1mm / s, and after the moving time lasts for 1-2min, stop the controller 10.

[0066] (3) At the same time, stop the reacti...

Embodiment 2

[0068] Example 2: Preparation of bent carbon nanotubes

[0069] (1) Cut out two pieces of 10-mesh copper grid with a size of 5×1cm and 1×1cm, and cross-connect them at one end with an angle of 30 degrees.

[0070] (2) will press with 0.03M FeCl 3 Catalyst Si / SiO in ethanol solution 2 (800nm ​​oxide layer) rectangular strip substrate is placed on the above-mentioned combined copper grid, placed in the quartz boat 3, and placed in the reactor 5 of the tubular heating furnace 2.

[0071] (3) Pass 200 sccm of argon and hydrogen mixture (Ar:H2=1:2, v / v) into the reactor 5 as a protective gas, and start to heat up, when the temperature rises to 900 ~ 1010 ° C , constant temperature for 20min. Then enter the reaction stage, feed 180sccm methane and hydrogen gas mixture (H2:CH4=2:1, v / v), start the ultra-long carbon nanotube preparation reaction, the reaction time is 20-120min, the controller 10 is in stop state all the time .

[0072] (4) After the reaction is over, enter the co...

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Abstract

The invention provides a method and device for in-situ assembly of one-dimensional nano materials. The method comprises the steps that a growth substrate for delivering the one-dimensional nano materials is arranged on a base plate or a boat, wherein the base plate or the boat is connected to an internal magnet and integrally arranged in a reactor of a tube heating furnace; a motor drives a sliding rail where an external magnet is suspended to make linear motion outside the reactor through a drive mechanism, and the moving speed of the base plate or the boat is controlled through the magnetic force between the external magnet and the internal magnet; and winding and tensile failure of the one-dimensional nano materials or in-situ assembly of the one-dimensional nano materials in different shapes can be achieved by changing the moving speed of the external magnet in the growth stage of the one-dimensional nano materials or by adjusting the initial setting of the growth substrate. By adoption of the method and device, one-step in-situ assembly of the one-dimensional nano materials can be achieved, the materials are prevented from being damaged during later operation, and the method and device can be popularized to be applied for other structure design and assembly of the one-dimensional nano materials.

Description

technical field [0001] The invention relates to the technical field of preparation and assembly of nanomaterials, in particular to a method and device for in-situ assembly of one-dimensional nanomaterials, and in particular to a method for directly realizing winding and breaking of a single one-dimensional nanomaterial through one-step in-situ reaction , In situ assembly method of one-dimensional nanomaterials with different morphologies. Background technique [0002] At present, nanomaterials are an important research field of nanotechnology and material applications. Among them, one-dimensional nanomaterials are widely used in nanoelectronics due to their unique characteristics of high aspect ratio and excellent properties of light, electricity, magnetism, force, and heat. Devices, nanosensors, nanomachines, nanobiological detection and other fields have shown great application potential. One-dimensional nanomaterials refer to materials with two dimensions in nanometer sc...

Claims

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Application Information

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IPC IPC(8): B82B3/00C01B32/16B82Y40/00
CPCB82B3/0004B82B3/0009B82B3/0061B82Y40/00
Inventor 朱振兴魏飞白云祥
Owner TSINGHUA UNIV
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