Preparation method of graphene-loaded ultrathin metal sheet with atomic-scale thickness

A graphene, atomic-level technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, nanotechnology for materials and surface science, etc. The problem of sufficient exposure of elemental atoms to achieve excellent electrical properties and good stability

Active Publication Date: 2014-07-16
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although highly dispersed nano-metal particles can be prepared by using this effect of hydrotalcite, it is still difficult to achieve sufficient exposure of each metal element atom, which cannot fully exert its function.
Therefore, there are great challenges and opportunities to prepare single-atom-layer-thick nanosheets using hydrotalcite as a precursor.

Method used

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  • Preparation method of graphene-loaded ultrathin metal sheet with atomic-scale thickness
  • Preparation method of graphene-loaded ultrathin metal sheet with atomic-scale thickness
  • Preparation method of graphene-loaded ultrathin metal sheet with atomic-scale thickness

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of graphite oxide: Mix 3.0g of graphite powder and 1.5g of sodium nitrate in an ice-water bath, then add 69mL of concentrated sulfuric acid, and then add 9.0g of potassium permanganate under magnetic stirring; After stirring for 30 minutes, add 138 mL of deionized water, raise the temperature to 98°C, stir at a constant temperature for 15 minutes, then transfer to an ice-water bath to cool; finally pour it into a large beaker containing 420 mL of deionized water and 3 mL of 30 wt% hydrogen peroxide, 1000 r / min The upper layer liquid was taken by centrifugation, and dried in vacuum for 24 hours to obtain graphite oxide.

[0019] 1. The graphite oxide prepared above is ultrasonically dispersed in deionized water to obtain a 5 mg / L single-layer graphene oxide colloidal sol;

[0020] 2.a: Add 0.08mol nickel nitrate hexahydrate, 0.04mol aluminum nitrate nonahydrate and 0.4mol urea to 400mL deionized water, transfer to a polytetrafluoroethylene reactor after fully...

Embodiment 2

[0025] 1. the graphite oxide prepared by embodiment 1 is ultrasonically dispersed in deionized water to obtain a single-layer graphene oxide colloidal sol of 5 mg / L;

[0026] 2.a: Add 0.008mol cobalt nitrate hexahydrate, 0.004mol aluminum nitrate nonahydrate and 0.028mol urea to 800mL deionized water, and after fully dissolved, stir continuously for 48 hours in a water bath at 97°C under nitrogen protection, and wash the obtained solid with deionized water Wash with absolute ethanol for 3 times and dry under air condition to obtain carbonate intercalated cobalt aluminum hydrotalcite;

[0027] b: Dissolve 0.4 g of the solid obtained in step a, 0.6 mol of sodium nitrate and 0.002 mol of concentrated nitric acid with a mass fraction of 69.2% in 400 mL of deionized water, and continuously stir at room temperature for 24 h under nitrogen protection, and vacuum-dry the obtained solid after centrifugal washing. Obtain nitrate radical intercalation cobalt aluminum hydrotalcite;

[00...

Embodiment 3

[0031] 1. the graphite oxide prepared by embodiment 1 is ultrasonically dispersed in deionized water to obtain a single-layer graphene oxide colloidal sol of 5 mg / L;

[0032] 2.a: Add 0.005mol cobalt dichloride hexahydrate, 0.0025mol nickel dichloride hexahydrate and 0.045mol hexamethylenetetramine into 1000mL deionized water, and after fully dissolving, stir the above solution continuously under nitrogen protection and reflux for 5 hours, the obtained solid was washed 3 times with deionized water and absolute ethanol, and then dried under air conditions to obtain carbonate intercalated cobalt-nickel hydrotalcite;

[0033] b: Take 0.186 g of the solid obtained in step a, disperse it into an acetonitrile solution in which 0.00667 mol of bromine is dissolved, stir the mixture continuously at room temperature under nitrogen protection for 24 hours, wash the resulting solid with absolute ethanol for 5 times, and then vacuum-dry it to obtain bromide ions Intercalated cobalt nickel ...

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Abstract

The invention discloses a method for preparing a metal sheet with thickness of a monoatomic layer by taking hydrotalcite single-layer laminated sheet as a precursor. By using the method, a nano material with ordered transition metal nanosheets with atomic-scale thickness loaded on grapheme is prepared. The method comprises the following steps: firstly preparing a graphene oxide colloid solution; subsequently preparing a colloid solution of a hydrotalcite peeling layer, dropwise adding a peeled hydrotalcite colloid solution into a graphene oxide solution, precipitating in the presence of electrostatic interaction till an upper solution is clarified; reducing the obtained sediment by using sodium borohydride. The prepared graphene-loaded ultrathin metal sheet with atomic-scale thickness is capable of fully exposing each atom; due to the presence of the graphene, the graphene-loaded ultrathin metal sheet is excellent in electrical property and has important application values in fields of catalytic, electrochemical and functional devices.

Description

technical field [0001] The invention belongs to the technical field of inorganic material synthesis, and in particular relates to a method for preparing graphene-supported atomically thick ultra-thin metal sheets. Background technique [0002] In recent years, two-dimensional materials (such as graphene) with a thickness of one atomic layer or several atomic layers have attracted extensive attention due to their special physical and chemical properties. However, there are relatively few studies on two-dimensional metal nanosheets with a thickness of one atomic layer, especially transition metal nanosheets have not been reported. Compared with noble metal nanosheets, transition metal nanosheets not only have high activity and stability, but also have more abundant and cheaper sources. However, due to the limitation of the nature of metal atoms, it is difficult to realize the atomic separation by physical or chemical methods. An ordered arrangement on a two-dimensional level....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/75B22F9/24B82Y30/00B82Y40/00
Inventor 卫敏邵明飞栗振华段雪
Owner BEIJING UNIV OF CHEM TECH
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