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Method for silver nanowire purification through vibration and sedimentation

A technology of silver nanowires and purification methods, which is applied in nanotechnology, transportation and packaging, metal processing equipment, etc., can solve the problems of prolonging the processing cycle, consuming a large amount of acetone, and large consumption of reagents, so as to shorten the purification time and reduce consumption Quantity, good effect of purification

Inactive Publication Date: 2017-09-05
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method needs to consume a large amount of acetone, the cost is high, and it needs to be left standing for a long time. For example, in the patent example, 20 mg of silver nanowires are dispersed in 10 mL of an aqueous solution containing polyvinylpyrrolidone (PVP), which needs to be purified 4 times. A total of 160mL of acetone is required, and the total standing time is 40min, which takes a lot of time
Patent CN201610538533.4 discloses a method of adding ethyl acetate to an aqueous solution of silver nanowires and then allowing the nanowires to agglomerate and purify. However, this method has many steps, cumbersome operations, and high reagent consumption. For example, In this patent example, 20mL of silver nanowire mother liquor needs to be purified 5 times, and a total of 60mL of ethanol solution containing PVP and 70mL of ethyl acetate are required.
Documents (Mayousse C, Celle C, Moreau E, et al. Improvements in purification of silver nanowires by decantation and fabrication of flexible transparent electrodes. Application to capacitive touch sensors [J]. Nanotechnology, 2013, 24 (21): 215501.) reported through The method of allowing the silver nanowire mother liquor to stand naturally to allow the nanowires to settle and separate the impurity particles, the method is simple to operate and low in cost, but the standing time is as long as 2 days, which significantly prolongs the treatment cycle

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  • Method for silver nanowire purification through vibration and sedimentation
  • Method for silver nanowire purification through vibration and sedimentation
  • Method for silver nanowire purification through vibration and sedimentation

Examples

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Embodiment 1

[0024] Embodiment 1: prepare silver nanowire according to polyol method, operation is as follows: first prepare solution, comprise A(CuCl 2 Soluble in ethylene glycol (EG), Cl - Concentration is 1mM), B (190mg PVP dissolved in 15mL EG, where PVP molecular weight is 1,300,000), C (240mgAgNO 3 dissolved in 15 mL EG). Add 3.17mL of solution A into 46.8mL of EG, preheat to 170°C, add 15mL of solution B, heat to 170°C, add 15mL of solution C to the above solution evenly within 60 minutes, and keep warm at 170°C for 20 minutes. Cool in air to obtain silver nanowire mother liquor. The solid content in the mother liquor is about 1.9mg / mL. figure 1 It is a scanning electron micrograph of unpurified nanowires, and the length of the nanowires is between 0-220 μm. In addition to nanowires, the product also contains more nanoparticles. Follow the steps below to purify:

[0025] Step 1. Take 3mL of mother liquor, add 9mL of acetone to it, use a mixer to vibrate at a rate of 2000 rpm f...

Embodiment 2

[0029] Embodiment 2: prepare silver nanowire according to polyol method, operation is as follows: first preparation solution, solvent is EG, comprises A (KBr solution, concentration is 2mM), B (PVP solution, concentration is 300mM, wherein PVP molecular weight is 1,300,000 ), C (AgNO 3 solution, the concentration is 300mM). Add 12.008mL of EG, 2.116mL of solution A, 3.526mL of solution B, and 2.351mL of solution C into the flask in turn, stir for 30min, put it in a preheated oil bath and heat to 150°C, keep it warm for 3h without stirring, and in air cooling in medium to obtain silver nanowire mother liquor. The solid content in the mother liquor is about 3.8mg / mL. image 3 It is a scanning electron micrograph of unpurified nanowires, and the length of the nanowires is between 0-80 μm. In addition to nanowires, the product also contains more stubby nanorods, submicron and micron particles. Purify as follows:

[0030] Step 1. Take 6mL of mother liquor, add 18mL of acetone ...

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Abstract

The invention relates to a method for silver nanowire purification through vibration and sedimentation and belongs to the technical field of silver nanowire purification. The technical problems that an existing method for silver nanowire purification is large in acetone dosage and poor in removal effect of impurities such as particles are solved. The method comprises the steps that 1, acetone is added into a silver nanowire mother solution prepared through a polyol method, vibration is conducted, and an upper solution is removed; 2, then distilled water is added, vibration is conducted till the nanowire is completely dispersed, acetone is added again, vibration is conducted, and an upper solution is removed; and 3, if the upper solution is muddy, operation of the step two is repeated till an upper solution is completely clear and transparent, the upper solution is removed, and silver nanowire purification is completed. According to the method for silver nanowire purification through vibration and sedimentation, acetone adding and vibration are combined, the impurities such as the particles in a nanowire solution are separated step by step, purity of the silver nanowire is greatly improved, the acetone dosage is reduced, still standing is not needed, treating time is shortened, the operation steps are few, complex devices are not needed, and the method has an obvious cost advantage.

Description

technical field [0001] The invention belongs to the technical field of silver nanowire purification, and in particular relates to a method for purifying silver nanowires through oscillation and sedimentation. Background technique [0002] In recent years, flexible electronic devices have received extensive attention, and electrodes based on conductive nanomaterials are one of the most important components of high-performance flexible electronic devices. Silver nanowires have become one of the most promising flexible electrode materials because of their extremely high conductivity and flexibility, good stability and low cost. [0003] Due to the advantages of controllable product structure, high yield, and low cost, the polyol method has become the main method for preparing silver nanowires. Due to the formation of some crystal nuclei that cannot grow into nanowires during the synthesis process, and some incompletely reacted silver halide particles that may remain, there mus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B82Y40/00
CPCB82Y40/00B22F1/0547B22F1/145
Inventor 林铁松何鹏黄钊
Owner HARBIN INST OF TECH
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