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Hollow precious metal nanowire as well as preparation method and application thereof

A technology of nanowires and noble metals, which is applied in the field of hollow noble metal nanowires and its preparation and application, and can solve problems such as complicated preparation processes

Inactive Publication Date: 2015-12-16
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method often requires two steps, that is, the first step is to synthesize Ag one-dimensional nanomaterials, and the second step is to perform galvanic reaction. The preparation process of this preparation method is cumbersome.

Method used

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  • Hollow precious metal nanowire as well as preparation method and application thereof
  • Hollow precious metal nanowire as well as preparation method and application thereof
  • Hollow precious metal nanowire as well as preparation method and application thereof

Examples

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preparation example Construction

[0025] The present invention investigates the influence of different metal salts as precursors in the preparation process of hollow precious metal nanowires, and finds that all the metal salts provided by the present invention can be used to grow M-Ag hollow nanowires.

[0026] In some embodiments of the present invention, the M metal precursor and AgNO 3 The molar ratio is (0.1-10):1; preferably M metal precursor and AgNO 3 The molar ratio of ascorbic acid is (1-5):1; the molar ratio of ascorbic acid to M metal precursor is 5:1.

[0027] In other embodiments of the present invention, the M metal precursor includes at least one of Pt salt, Pt acid, and Pd salt; and the Pt acid is H 2 PtCl 6 ; The Pt salt is Na 2 PtCl 6 And / or K 2 PtCl; The Pd salt is K 2 PdCl 4 And / or Na 2 PdCl 4 .

[0028] In the present invention, the M metal precursor is preferably dried before use.

[0029] The present invention investigates the influence of reaction temperature and reaction time on the growth of n...

Embodiment 1

[0061] Example 1: Use H 2 PtCl 6 Used as a Pt source to prepare hollow Pt-Ag nanowires (the molar ratio of Pt to Ag is 0.12).

[0062] At room temperature, take 2.9mgH 2 PtCl 6 And 10mgAgNO 3 Dissolved in 20 mL of ethylene glycol, added 15 mg of ascorbic acid, and then added 0.4 mL of polydiallyl dimethyl ammonium chloride. After the ultrasonic dissolution was completed, the reaction was allowed to stand at room temperature for 20 hours to obtain gray-brown hollow Pt-Ag nanowires. Transfer the reaction solution in the bottle to a centrifuge tube, centrifuge for 10 minutes (10,000 revolutions / min), and disperse the sediment in water again, then centrifuge again, repeat the sedimentation and centrifugation process 3 times to remove by-products and excess solvent in the solution And the protective agent can finally obtain pure hollow Pt-Ag nanowires.

Embodiment 2

[0063] Example 2: Use Na 2 PtCl 6 Used as a Pt source to prepare hollow Pt-Ag nanowires (the molar ratio of Pt to Ag is 0.12).

[0064] At room temperature, take 3.2mgH 2 PtCl 6 And 10mgAgNO 3 Dissolved in 20 mL of ethylene glycol, added 15 mg of ascorbic acid, and then added 0.4 mL of polydiallyl dimethyl ammonium chloride. After the ultrasonic dissolution was completed, the reaction was allowed to stand at room temperature for 20 hours to obtain gray-brown hollow Pt-Ag nanowires. Transfer the reaction solution in the bottle to a centrifuge tube, centrifuge for 10 minutes (10,000 revolutions / min), and disperse the sediment in water again, then centrifuge again, repeat the sedimentation and centrifugation process 3 times to remove by-products and excess solvent in the solution And the protective agent can finally obtain pure hollow Pt-Ag nanowires.

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Abstract

The invention relates to a hollow precious metal nanowire as well as a preparation method and application thereof. The method comprises the following steps: taking ascorbic acid as a reducing agent to reduce Pt or Rh and Ag salt to metal atoms; and taking poly (diallyldimethylammonium chloride) as a protective agent, and synthesizing an M-Ag hollow nanowire in one step at the room temperature under a template induction effect of the poly (diallyldimethylammonium chloride) on the growth of a nano material. Meanwhile, the surface of the Pt-Ag or Pd-Ag nanowire is coated with the protective agent, so that the stability and solubility of the Pt-Ag or Pd-Ag nanowire can be greatly improved, and a foundation is set for the application in the field of the biology and the field of catalysis in the future. The M-Ag hollow nanowire prepared by the method is simple in process, high in product yield, uniform and controllable in structure, short in preparation period, and convenient in rapid and mass preparation. The method is easy for controlling the preparation condition, simple in required equipment, relatively high in product preparation success rate and good in industrial application prospect.

Description

Technical field [0001] The invention belongs to the technical field of precious metal nanomaterials, and relates to a hollow precious metal nanowire and its preparation and application. Background technique [0002] Noble metal nanomaterials have important application prospects in catalysis, electronics, optics and other fields. Among them, Pt-based noble metal nanoparticles have received widespread attention due to their good catalytic activity (C. Cui, L. Gan, HHLi, SHYu, M. Heggen, P. Strasser. NanoLett. 2012, 12, 5885-5889 ). The catalytic activity of noble metal nanomaterials not only depends on the particle size, but also on the shape, composition and structure of the material. Due to the synergistic catalytic effect between metals, bimetallic nanomaterials have more excellent performance, which has attracted the attention of domestic scientific researchers (L.Liu,E.Pippel.Angew.Chem.Int.Ed.,2010,50,1 –6). In addition, the hollow precious metal nanomaterials have a larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B01J23/50
Inventor 杨云徐丽张礼杰邹超陈伟黄少铭
Owner WENZHOU UNIVERSITY
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