Peeling method of two-dimensional layered nano material

A two-dimensional layered nano-octadecyl dimethyl ammonium chloride technology, which is applied in nanotechnology, chemical instruments and methods, lamination, etc., can solve the problem of high operating environment requirements for chemical reagents and lack of industrial production , chemical stripping method time-consuming and other problems, to achieve the effect of low cost, high yield and mild conditions

Active Publication Date: 2014-04-02
SHENZHEN INST OF ADVANCED TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above two methods are difficult to obtain high-yield two-dimensional single-layer and multi-layer nanomaterials; while the chemical exfoliation method is very time-consuming and the chemical reagents used have high requirements for the operating environment and low method safety; these three methods are not industrialized. production potential, and thus, are not ideal methods for obtaining 2D single-layer, multilayer nanomaterials

Method used

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  • Peeling method of two-dimensional layered nano material
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  • Peeling method of two-dimensional layered nano material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A molybdenum disulfide (MoS 2 ) stripping method, comprises the steps:

[0042] (1) Graphite pretreatment: Add 100mg of graphite powder (Sigma Aldrich, 1μm) into 10mL of 80°C sulfuric acid solution, keep magnetic stirring for 4 hours and stop heating, slowly add 2L of deionized water to the mixed solution for dilution, and let it stand for 8 hours , and then filtered (using PTFE filter membrane, diameter 47mm, Millipore filter) to remove the sulfuric acid solution, the filtered solid was vacuum dried at 100°C for subsequent use;

[0043] Preparation of graphene oxide: Add the above-mentioned pretreated graphite powder (5g) into a mixed solution of nitric acid (33mL, 68%) and sulfuric acid (200mL, 98%), and after magnetically stirring in an ice bath for 30 minutes, 30g high Potassium manganate (KMnO 4 ) into the above mixture slowly and keep the temperature at about 5°C. After the potassium permanganate is completely added, the reaction temperature is raised to 40°C, s...

Embodiment 2

[0049] A kind of tungsten disulfide (WS 2 ) stripping method, comprises the steps:

[0050] (1) Graphite pretreatment: Add 100mg of graphite powder (Sigma Aldrich, 1μm) into 10mL of 80°C sulfuric acid solution, keep magnetic stirring for 4 hours and stop heating, slowly add 2L of deionized water to the mixed solution for dilution, and let it stand for 8 hours , and then filtered (using PTFE filter membrane, diameter 47mm, Millipore filter) to remove the sulfuric acid solution, the filtered solid was vacuum dried at 100°C for subsequent use;

[0051] Preparation of graphene oxide: Add the above-mentioned pretreated graphite powder (5g) into a mixed solution of nitric acid (33mL, 68%) and sulfuric acid (200mL, 98%), and after magnetically stirring in an ice bath for 30 minutes, 30g high Potassium manganate (KMnO 4 ) into the above mixture slowly and keep the temperature at about 5°C. After the potassium permanganate is completely added, the reaction temperature is raised to 40...

Embodiment 3

[0057] A kind of tungsten disulfide (WS 2 ) stripping method, comprises the steps:

[0058] Add 2g of octadecyldimethylammonium chloride (Sigma Aldrich) into 500mL of isopropanol (IPA), place it in a water bath ultrasonicator (Branson2510EMT) and sonicate at 750w for 2h to obtain a mixed solution, then weigh 2g of disulfide Tungsten (WS 2 ) powder (Sigma Aldrich, 1 μm) was added to the above mixed solution, and then placed in a probe-type intense dispersion ultrasonic instrument (Vibra-Cell TM VCX), 1500W ultrasound for 2h;

[0059] After the ultrasonication is completed, centrifuge the above mixed solution at 1500rpm for 60 minutes, remove the supernatant, and repeatedly wash the centrifuged precipitate with deionized water (three to four times) to completely remove octadecyl dimethyl chloride ammonium, and finally collect the precipitated product and filter it (PTFE filter membrane, diameter 47mm, Millipore filter), and then vacuum dry (100°C) to obtain tungsten disulfide...

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Abstract

The invention provides a peeling method of a two-dimensional layered nano material. The peeling method comprises the following steps of: dissolving an amphiphilic surface active agent in an organic solvent, and carrying out ultrasonic water bathing for 0.5-2 hours to obtain mixed solution, wherein the organic solvent is one or more in a mercaptan solvent, octadecylamine, isopropanol, a sulfur solvent, an amino-acid solvent, a polyamino solvent and a polyalcohol solvent; adding a transition metal compound to be peeled into the mixed solution, carrying out 1000-1800w ultrasonic treatment and 1500-5000rpm centrifugal treatment to remove supernatant, collecting precipitates, filtering and drying to obtain solid, i.e., the peeled two-dimensional layered nano material. The peeling method provided by the invention has the advantages that the process is simple, the yield is higher, one-layer, double-layer and multi-layer controllable nano materials with two-dimensional complete crystal surface structures can be obtained, the industrial production with low cost is easily implemented and the problem of secondary pollution to the environment is avoided.

Description

technical field [0001] The invention relates to the field of novel nanomaterials, in particular to a stripping method of two-dimensional layered nanomaterials. Background technique [0002] Due to their unique physical and chemical properties, two-dimensional nanomaterials have immeasurable application potential in the fields of semiconductors, microelectronic devices, and biomedicine, and have attracted the attention of many researchers in recent years. For example, single-layer graphene has become one of the research hotspots in the field of nanomaterials due to its special electrical, optical, thermal and mechanical properties. Recent studies have found that other two-dimensional layered nanomaterials similar to graphene also have very unique physical and chemical properties. Especially the compounds composed of some transition metals and Group VIA, such as: MoS 2 、WS 2 、MoSe 2 、WSe 2 etc. These compounds are all "sandwich" structures composed of two layers of group ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B38/10B82Y40/00
Inventor 蔡林涛谢晓滨高冠慧师帅
Owner SHENZHEN INST OF ADVANCED TECH
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