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A kind of graphene functionalized nano needle tip and preparation method thereof

A technology of graphene function and needle tip, which is applied in the field of functionalization of metal materials, can solve the problems of inability to prepare graphene functionalized probes and uncontrollable tip structure, and achieve excellent electrical properties, excellent needle tip morphology, and sharp tip tips.

Active Publication Date: 2019-11-22
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the long-term high-temperature environment required for growth, the tip size of the obtained graphene-functionalized tips is on the micron level and the tip structure is uncontrollable.
So far, researchers have not been able to prepare graphene-functionalized probes with nanometer tip size and controllable tip structure

Method used

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  • A kind of graphene functionalized nano needle tip and preparation method thereof
  • A kind of graphene functionalized nano needle tip and preparation method thereof
  • A kind of graphene functionalized nano needle tip and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Metal Ni needle tips with a tip diameter of about 30nm were prepared by electrochemical corrosion method. figure 1 A schematic diagram of the device for preparing the original nickel needle by electrochemical corrosion method, the nickel wire is connected to the positive pole of the power supply, and the gold ring is connected to the negative pole of the power supply. The 1M KCl liquid film on the gold ring was used to gradually corrode the Ni wire to finally obtain the Ni needle tip. figure 1 b is the TEM image of the generated nickel needle, the surface of the needle tip is smooth, and the tip size is about 30nm. figure 1 c corresponds to the HR-TEM image of the nickel needle tip, figure 1 The d is the corresponding SAED pattern. The apex angle of the tip of the needle tip is about 30°.

[0047] The Ni needle tip was rinsed with a large amount of water, soaked in dilute acetic acid to remove the surface oxide layer, rinsed with a large amount of water, and dried wi...

Embodiment 2

[0053] Metal Ni needle tips with a tip diameter of about 30nm were prepared by electrochemical corrosion method. The Ni needle tip was rinsed with a large amount of water, soaked in dilute acetic acid to remove the surface oxide layer, rinsed with a large amount of water, and dried with nitrogen. The above-mentioned Ni needle tip was fixed vertically in an autoclave, and 100 μL of triethylene glycol solution with a purity of 99% was added, while 450 μL of a 0.1 mol / L NaOH solution was added and mixed well. The above reaction kettle was placed in a muffle furnace, heated to 220°C at a heating rate of 5°C / min and kept for 2 hours, and then cooled down naturally.

[0054] Take out the above-mentioned Ni needle tip, rinse it with a large amount of water, dry it with nitrogen, and spot weld it in the middle of the metal Pt strip with a length of 25mm*width 0.85mm*thickness 0.05mm; the metal Pt strip is bent into a U shape, and the two ends are spot-welded and fixed on the ceramic ...

Embodiment 3

[0057] Metal Ni needle tips with a tip diameter of about 30nm were prepared by electrochemical corrosion method. The Ni needle tip was rinsed with a large amount of water, soaked in dilute acetic acid to remove the surface oxide layer, rinsed with a large amount of water, and dried with nitrogen. The above-mentioned Ni needle tip was fixed vertically in an autoclave, and 100 μL of triethylene glycol solution with a purity of 99% was added, while 450 μL of a 0.1 mol / L NaOH solution was added and mixed well. The above reactor was placed in a muffle furnace, heated to 220°C at a rate of 5°C / min for 2 hours, and then cooled naturally.

[0058] The above-mentioned Ni needle tip was taken out, rinsed with a large amount of water, and dried with nitrogen gas. The tip of the needle tip was fixed on the corundum needle holder, and then the needle holder was placed in the heating area of ​​the tube furnace. Use a molecular pump to vacuum the cavity to 10 -5 Turn off the pump after Pa,...

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Abstract

The invention provides a graphene functionalized nano needle tip. The needle tip is a metal needle tip of which the surface is covered with a continuous graphene layer, the diameter of the tip end ofthe metal needle tip is 10-500 nm, and graphene and the surface of the needle tip are in good interface contact. The invention further provides a preparation method of the graphene functionalized nanoneedle tip. The graphene functionalized nano needle tip is in a good needle tip shape, the tip end of the needle tip is sharp, and the surface of the needle tip is flat; graphene formed in a large-area range is continuous and free of wrinkles. Sine graphene has excellent electric properties and graphene and the surface of the needle tip are in good interface contact, the graphene functionalized nano needle tip prepared by the method has incomparable electrical conductivity and durability in comparison with common metal needle tips. In addition, through chemical properties of graphene, the oxidation resistance of the improved functionalized nano needle tip is guaranteed.

Description

technical field [0001] The invention belongs to the field of functionalization of metal materials, and in particular relates to a needle tip modified with a graphene material and a preparation method thereof. Background technique [0002] With the rise of nanomaterials and nanotechnology, the preparation of nanomaterial-functionalized tips and their applications in different fields have aroused widespread interest from researchers all over the world. Based on the special structure and properties of nanomaterials, these functionalized nanotips usually have excellent mechanical and electrical properties. For example, nanodiamond tips have good application prospects in the fields of nanofabrication and tribological testing due to their excellent mechanical properties and durability. [1,2] . Conductive tungsten oxide nanorod functionalized tips can be used as multi-probe atomic force microscopy (AFM) probes for flexible electrical measurements and mechanical evaluations of dif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B82B1/00B82B3/00B82Y30/00B82Y40/00
CPCB82B1/001B82B3/0019B82Y30/00B82Y40/00
Inventor 徐建勋赵宇亮梁建波葛逸飞
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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