Method for preparing series of high-purity silver nanometer materials

A high-purity, silver nanotechnology, applied in the field of preparation of a series of silver nanomaterials, can solve the problems of large diameter changes of nanowires, complex reflux reaction devices, poor dispersion of synthetic products, etc., to achieve a wide range of size control, uniform shape, Good effect of monodispersity

Inactive Publication Date: 2011-10-12
SHANDONG UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Catherine Murphy of the University of South Carolina in the United States reported that under alkaline conditions (Caswell, K.K.; Bender, C.M.; Murphy, C.J. Nano Lett.2003, 3, 667-669.), the synthesis of a diameter of about 50 nanometers without other organic reagents Silver nanowires, the method is simple and environmentally friendly, but the synthetic product has poor dispersion and relatively low purity
In addition, the Chinese patent ZL200810019828.6 uses the solution phase synthesis method to rapidly synthesize silver nanowires in large quantities under microwave conditions. High, uneven shape
Chinese patent application 200710046510.2 uses a high-temperature reaction reflux device to synthesize a large amount of silver nanomaterials under the protection of an inert gas. The advantage of this method is that it can synthesize a large amount of silver nanomaterials. However, the problem with this method is that the reflux reaction device is complicated, and an inert gas is required for the reaction. protection, which greatly increases the cost of the method

Method used

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  • Method for preparing series of high-purity silver nanometer materials
  • Method for preparing series of high-purity silver nanometer materials
  • Method for preparing series of high-purity silver nanometer materials

Examples

Experimental program
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Effect test

Embodiment 1

[0039]First prepare the mixed solution of ethylene glycol, polyvinylpyrrolidone and copper chloride: weigh 1 gram of polyvinylpyrrolidone and add it to 25 milliliters of ethylene glycol for stirring or ultrasonic dissolution, then add 6 mg of potassium bromide and 6 mg of copper chloride, Stir or ultrasonically dissolve evenly for later use. Then prepare the mixed solution of ethylene glycol and silver nitrate: weigh 1 gram of silver nitrate and add it to 25 ml of ethylene glycol, stir or oscillate to dissolve evenly and set aside. Then take 45 milliliters of ethylene glycol and add it to the reaction kettle, after ultrasonic heating for 30 minutes; then add 2 milliliters of water and continue ultrasonication for 15 minutes, then mix the prepared silver nitrate ethylene glycol solution, polyvinylpyrrolidone and copper chloride The ethylene glycol mixed solution was injected into the reaction kettle through a syringe pump at a speed of 1 ml / min at the same time. After the dropw...

Embodiment 2

[0041] Similar to the process of Example 1, but when preparing silver nanomaterials, the inorganic salt containing halide ions was replaced by potassium chloride by copper chloride, and the amount was reduced to 4 mg. The heating time of ethylene glycol ultrasonic heating was reduced to 15 minutes, and other conditions remained unchanged. After the reaction is finished, wash and centrifuge with ethanol and ultrapure water, and dry the precipitate at low temperature until it becomes a dry powder to obtain silver nanowires with a diameter of 40 nanometers. image 3 Scanning electron microscope image of a silver nanowire with a diameter of 40 nm, by image 3 It can be seen that the silver nanowires with a diameter of 40 nm still maintain an ultra-long axial length.

Embodiment 3

[0043] Similar to the process of Example 1, but when preparing silver nanomaterials, the dripping rate of the syringe pump was increased to 1.5 ml / min, and the addition was completed and heated at 160 degrees in a high-temperature furnace, and the heating time was reduced to 30 minutes, and other conditions remained constant. After the reaction is finished, wash and centrifuge with ethanol and ultrapure water, and dry the precipitate at low temperature until it becomes a dry powder, and silver nanowires with a diameter of 120 nanometers can be obtained. Figure 4 Scanning electron microscope image of a silver nanowire with a diameter of 120 nm, by Figure 4 , 5 It can be seen that while the diameter of silver nanowires increases, the axial length decreases slightly, but still maintains high purity and high monodispersity.

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Abstract

The invention relates to a method for preparing series of high-purity silver nanometer materials. The method comprises the following steps: using a halogen-containing metal salt adjuvant to treat polyalcohol, a macromolecule surface active agent, the halogen-containing metal salt adjuvant and salts of silver ions in three steps, and then preparing the nanometer materials by performing a hybrid reaction at a high temperature. The nanometer materials prepared by the using the method have the advantages of uniform appearance, high purity, excellent monodispersity, lower cost, and simple reaction device. By using the method, the appearance is controllable, the size controlling scope is wide, and the large-scale synthesis of silver nanometer materials can be realized. The method has an industrialization prospect.

Description

technical field [0001] The invention relates to a method for preparing silver nanomaterials, in particular to a series of silver nanomaterials with controllable morphology and size that can be used in chemical and electrochemical catalysis, chemical sensors, biomolecular sensors, optical information storage, solar cells, etc. The method of preparation of the material. Background technique [0002] With the transformation of energy utilization patterns, especially the development and utilization of new generation solar cells, higher requirements are put forward for the use of metal nanomaterials with high conductivity and high continuity, such as copper nanomaterials and silver nanomaterials. Copper nanomaterials, especially the synthesis of copper nanowires, have been prepared by various methods, such as chemical vapor deposition (Kim, C.; Gu, W.; Briceno, M.; Robertson, I.M.; Choi, H.; Kim , K.Adv.Mater.2008, 20, 1859-1863), solution phase synthesis using hydrazine hydrate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 丁轶谷小虎
Owner SHANDONG UNIV
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