Quintuple twin-crystal seed induced silver nanowire and preparation method thereof

A quintuple twinning, silver nanowire technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of high impurity and poor uniformity of silver nanowires

Active Publication Date: 2019-06-07
BEIJING HINANO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of high impurity and poor uniformity of existing silver nanowires, the present invention provides a kind of high-purity silver nanowires induced by five-fold twinned seeds and its preparation method

Method used

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  • Quintuple twin-crystal seed induced silver nanowire and preparation method thereof
  • Quintuple twin-crystal seed induced silver nanowire and preparation method thereof
  • Quintuple twin-crystal seed induced silver nanowire and preparation method thereof

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preparation example Construction

[0055] A method for preparing high-purity silver nanowires induced by five-twinned seeds provided by the invention, as a specific option, comprises the following steps:

[0056] S1, the explosive nucleation of monodisperse quintuple twins, the twin interface of the obtained quintuple twins is not terminated at the geometric boundary, the preferred S1 steps include:

[0057] Mix gold salt, silver salt, and polyvinylpyrrolidone evenly in a reducing solvent. Under high-speed stirring, the mixture is rapidly heated to 100-200°C by means of microwave, infrared or microchannel reactor, and the heating rate is ≥10°C. / min, reacted for 0.1-5h, thereby obtaining monodisperse gold-silver alloy quintuple twin crystal seeds; the reducing solvent contains amide groups, and the gold salt contains chlorine; the monodisperse quintuple twin crystal seeds The surface contains Au-Au structure, Au-Ag structure, Au-Ag-Cl structure, Au-Cl structure, chemically adsorbed Cl - , physical adsorption o...

Embodiment 1 5

[0064] The preparation of embodiment 1 fivefold twinned gold-silver alloy seed crystals

[0065] (1) Add 1.2g of PVP with a molecular weight of 55000 to 15mL DMF, stir well, add 100uL 100mM chloroauric acid solution, add 100uL ultrapure water, 100uL 100mM silver nitrate aqueous solution, stir well, transfer to the microchannel reactor, Heating rate 100°C / min, reaction at 120°C for 1h; cooling in ice bath;

[0066] (2) Get 500uL of the seed solution prepared in (1), add 100uL of 100mM chloroauric acid solution, 900uL of ultrapure water, 1.2g of PVP with a molecular weight of 55000, 15mL of DMF, stir evenly, transfer to the microchannel reactor, and heat up The rate is 100°C / min, and the reaction is at 120°C for 1h; the five-twinned ellipsoid obtained in this step, such as figure 2As shown, the shape of the obtained ellipsoid is uniform, and the size is adjustable in the range of 1-20 nm.

Embodiment 2

[0067] Example 2 The Ag-Ag structure is exposed on the surface of the seed crystal

[0068] Centrifuge the solution obtained in step (2) in Example 1, add 5 mL of ammonia water to the obtained precipitate, disperse and stir for 20 min, centrifuge at a rate of 15000 rpm for 10 min, add 10 mL of deionized water to the precipitate, stir and disperse for 5 min, centrifuge at a rate of 15000 rpm for 10 min, remove In the supernatant, transfer the obtained red precipitate to 10mL 0.05M PVP / EG solution, stir and disperse, add 100uL 100mM silver nitrate solution, raise the temperature to 160°C, and react for 30min.

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Abstract

The invention discloses a quintuple twin-crystal seed induced silver nanowire and a preparation method thereof. The quintuple twin-crystal seed induced silver nanowire and the preparation method thereof overcome the problems of high impurity and low uniformity of an existing polyhydric alcohol reduction method. The method comprises the steps of smelting gold salt and silver salt in a reductive solvent to form cores so as to obtain twin-crystal seed crystals which are characterized in that the twin-crystal boundary is not ended in geometrical boundary; and then adding a halogens catalyst and silver salt to react under high temperature so as to obtain high-yield single-dispersity silver nanowire of which the surface is provided with a protruded surface or sunken surface substructure; and theside surface of the silver nanowire is incompletely-exposed {100} crystal surface. According to the preparation method, the quintuple twin crystals are quickly smelted to form core so as to obtain the uniform seed crystals; and the synthesized silver wire is high in single dispersity and high in controllability.

Description

technical field [0001] The invention belongs to the technical field of metal functional materials and nanomaterials, and in particular relates to a silver nanowire induced by five-twin seeds and a preparation method thereof. Background technique [0002] Silver nanowires have attracted widespread attention due to their small size, large specific surface area, good catalytic properties, antibacterial properties, and biocompatibility. In addition, due to its excellent conductivity, ductility and stretchability, silver nanowires can be made into transparent conductive films, replacing ITO, and are widely used in flexible touch displays and large-size touch displays. [0003] At present, there are many reports on the research of silver nanowires, see "Large scale preparation of silver nanowires with different diameters by a one-pot method and their application in transparent conducting films", RSC Adv.8096, 6, 2016; "Hydrothermal synthesis method Preparation of silver nanowires...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00B82Y30/00
Inventor 刘腾蛟李鑫苏燕平胡源
Owner BEIJING HINANO TECH CO LTD
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