Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Gold nanowires with mixed optional arrangement of various close-packed structures and their preparation method and application

A gold nanowire and close-packed technology, applied in the field of nanoscience, can solve the problems of easy phase transition, limited method of gold nanocrystal, poor stability of gold nanocrystal, etc., and achieve simple preparation method, excellent catalytic performance and enhanced catalytic performance Effect

Active Publication Date: 2018-08-07
XI AN JIAOTONG UNIV
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in terms of the synthesis and preparation of the phase structure, the existing methods are very limited. Except for the conventional face-centered cubic structure, only Hua Zhang et al. successfully synthesized tetragonal gold nanoflakes with a 2H hexagonal close-packed structure, and a 4H hexagonal close-packed structure. Gold nanoribbons and 4H and face-centered cubic composite stacked gold nanorods, etc.
[0004] So far, the above work still has the following deficiencies: first, the methods for preparing gold nanocrystals with various stacked structures are limited, and the experimental cycle is very long (often more than 10 hours), making it difficult to prepare in large quantities; second, the preparation has The defect structure, especially the gold nanocrystal structure with high density defects, is difficult to achieve large-scale preparation; third, there is no method so far to prepare gold nanocrystals with three or more different stacking structures at the same time.
Fourth, most of the gold nanocrystals with non-face-centered cubic stacking structures obtained so far have poor stability and are prone to phase transitions during catalytic reactions.
These reasons obviously limit the practical application of highly active nano-gold catalysts.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Gold nanowires with mixed optional arrangement of various close-packed structures and their preparation method and application
  • Gold nanowires with mixed optional arrangement of various close-packed structures and their preparation method and application
  • Gold nanowires with mixed optional arrangement of various close-packed structures and their preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] (1) In the air, put 1.25*10 -2 mmol tetrachloroauric acid and 5*10 -2 Add mmol copper chloride to 6mL oleylamine, stir and mix well.

[0062] (2) In the air, place the solution in step (1) in an oil bath at 180° C. and stir, react for 2 minutes and 30 seconds, centrifuge, discard the supernatant, and wash the bottom precipitate (n-hexane: ethanol=1 : 1, three times) to obtain gold nanowires with a variety of close-packed structures mixed and arranged randomly. Its transmission electron microscope pictures are shown in figure 1 middle.

Embodiment 2

[0064] (1) Set 1.25*10 -2 mmol tetrachloroauric acid and 5*10 -2 Add mmol copper chloride to 6mL oleylamine, stir and mix well.

[0065] (2) Stir the solution in step (1) in an oil bath at 170°C, centrifuge after reacting for 3 minutes, discard the supernatant, and wash the bottom precipitate to obtain gold nanowires with a variety of close-packed structures mixed in random arrangements . Its transmission electron microscope pictures are shown in figure 2 middle.

Embodiment 3

[0067] (1) Set 1.25*10 -2 mmol tetrachloroauric acid and 5*10 -2 Add mmol copper chloride to 6mL oleylamine, stir and mix well.

[0068] (2) Stir the solution in step (1) in an oil bath at 160°C, centrifuge after reacting for 4 minutes, discard the supernatant, and wash the bottom precipitate to obtain gold nanowires with a variety of close-packed structures mixed in random arrangements . Its transmission electron microscope pictures are shown in image 3 middle.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
The average diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides gold nanowires with mixed optional arrangement of various close-packed structures and their preparation method and application. The preparation method comprises the steps of 1)dispersing a gold precursor, a copper salt and an etching agent in oleylamine to obtain a reaction liquid; 2) allowing the reaction liquid of step 1) to react at 100-210 DEG C, centrifuging after reaction, and washing to obtain the gold nanowires with mixed optional arrangement of various close-packed structures. The gold nanowires prepared by the preparation method have an average diameter of 13.2 nanometers and can be supported on activated carbon, silicon dioxide, titanium dioxide or alumina to act as a catalyst to catalyze dehydrogenative coupling reaction and electrocatalytic reduction ofcarbon dioxide. The gold nanowires have high-density defect structure, and exhibits enhanced catalytic performance in catalytic reaction, particularly in dehydrogenative coupling reaction of silane and water (and hydroxy compounds).

Description

technical field [0001] The invention belongs to the field of nanometer science, and relates to a gold nanowire with a variety of close-packed structures mixed and arranged arbitrarily, as well as a preparation method and application thereof. Background technique [0002] Since Haruta et al. discovered in 1989 that gold nanoparticles have high low-temperature carbon monoxide catalytic oxidation performance and their unique humidity enhancement effect, nano-gold catalysts have gradually become the darling of scientists and industries. They are widely used in environmental pollution, electrochemical biosensors, etc. fields have a wide range of applications. The reserves of gold in the earth's crust are scarce and the distribution is extremely scattered. These two factors make the price of gold very expensive. Therefore, how to improve the activity, selectivity, and stability of gold catalysts is of great significance to economic development, environmental protection, and resou...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/0547B22F1/07
Inventor 金明尚王超骐
Owner XI AN JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products