A controllable preparation method of uniform silver nanowires with small diameter and ultrahigh aspect ratio

A nano-silver wire and aspect ratio technology, which is applied in the field of controllable preparation of uniform nano-silver wires, can solve the problems of large diameter and long time-consuming of nano-silver wires, and achieve the effects of short reaction time, simple operation and easy mass production.

Active Publication Date: 2022-01-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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Problems solved by technology

But the diameter of the nano-silver wire prepared by this method is relatively large (about 100nm), and the aspect ratio is small (about 400), which takes a long time.

Method used

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  • A controllable preparation method of uniform silver nanowires with small diameter and ultrahigh aspect ratio
  • A controllable preparation method of uniform silver nanowires with small diameter and ultrahigh aspect ratio
  • A controllable preparation method of uniform silver nanowires with small diameter and ultrahigh aspect ratio

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preparation example Construction

[0033] A method for the controllable preparation of a uniform silver nanowire with a small diameter and an ultrahigh aspect ratio, characterized in that it comprises the following steps:

[0034] Step 1, preparing an ethylene glycol solution of polyvinylpyrrolidone, adding inducers chloride salt, bromide salt and iron salt to it, and mixing evenly to obtain a mixed solution A;

[0035] Step 2, prepare the ethylene glycol solution B of silver nitrate;

[0036] Step 3. Slowly add solution B to mixed solution A, mix evenly, and place in a reaction kettle;

[0037] Step 4, heating the mixed solution in the reaction kettle to 155-165°C, keeping it warm until the reaction is complete to obtain the silver nanowire stock solution;

[0038] Step 5. After the nano-silver wire stock solution obtained in step 4 is cooled, it is centrifuged and washed to obtain uniform nano-silver wires with small diameter and super high aspect ratio.

[0039] Preferably, the K value of polyvinylpyrrolid...

Embodiment

[0049] Using ethylene glycol as a solvent, prepare a solution with a concentration of polyvinylpyrrolidone of 0.15mol / L; add NaCl, NaBr and FeCl to it 3 , so that Cl - The total concentration is 600μmol / L, Br - Concentration is 100μmol / L, Fe 3+ The concentration is 1.5 μmol / L, mix evenly to obtain the mixed solution A. Using ethylene glycol as a solvent, prepare silver nitrate solution B with a concentration of 0.1 mol / L. Slowly add solution B into mixed solution A, and mix well so that Ag + The ratio of concentration to polyvinylpyrrolidone is 1:1.5. The mixed solution was charged into a Teflon-lined stainless steel reaction kettle. Put the reaction kettle into a thermostat, and raise the temperature to 160° C. at a rate of 4° C. / min, and keep the temperature for 2 hours to obtain a silver nanowire stock solution. After the silver nano wire stock solution is cooled to room temperature, it is centrifuged at 6000 rpm for 5 minutes, and after using a mixture of ethanol and...

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Abstract

The invention discloses a controllable preparation method for uniform nano-silver wires with small diameter and ultra-high aspect ratio. The method uses chloride salts, bromide salts and iron salts as synergistic control agents to prepare nano-silver wires. Specifically, the method comprises the following steps: firstly preparing an ethylene glycol solution of polyvinylpyrrolidone (PVP), adding inducers chloride salt, bromide salt and iron salt therein, and mixing uniformly to obtain a mixed solution A. Then prepare silver nitrate solution B in ethylene glycol. Slowly add solution B to mixed solution A, mix well, place in a reaction kettle and raise the temperature to 155-165°C, and keep warm for 1.5-2.5 hours. After the reaction product is cooled to room temperature, it is centrifuged and washed to obtain silver nanowires with small diameter, uniform diameter distribution and super high aspect ratio. The preparation of this silver nano wire takes a very short time, is simple to operate, and is convenient for large-scale production. The diameter of the prepared silver wire is 45-50nm, and the aspect ratio is as high as 2000.

Description

technical field [0001] The invention belongs to the technical field of nano-metal material preparation, and in particular relates to a controllable preparation method of uniform nano-silver wires with small diameter and super high aspect ratio. Background technique [0002] One-dimensional nano-silver has excellent electrical conductivity, thermal conductivity, and bending resistance, and is used as a conductive interconnect or effective functional component in the preparation of microelectronic devices, such as photosensitive sensing and strain sensing. In these applications, by adjusting the morphology (size, aspect ratio, etc.) of one-dimensional nanosilver, devices can exhibit unique or better performance. For example, the peak position and number of surface plasmon resonance peaks are closely related to the morphology of one-dimensional silver nanomaterials; the plasmon resonance mode along the length direction of one-dimensional nanosilver red-shifts with the increase ...

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 陈金菊王小明冯哲圣吴海斌王焱刘书丽
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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