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Method for stripping Ti3C2 nanosheet

A nanosheet and centrifugal treatment technology, applied in the field of two-dimensional materials, can solve problems such as increasing energy consumption, achieve the effects of controllable process, strong promotion and application value, and simple implementation process

Inactive Publication Date: 2019-01-22
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, toxic organic solvents such as dimethyl sulfoxide or dimethyl formamide will be used in the ultrasonic dispersion and stripping, which is contrary to the current green chemistry advocated, and the high-power ultrasonic time is as long as about 20 hours, which undoubtedly greatly increases energy efficiency. consumption

Method used

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  • Method for stripping Ti3C2 nanosheet
  • Method for stripping Ti3C2 nanosheet
  • Method for stripping Ti3C2 nanosheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1.1 will Ti 3 AlC 2 The powder is placed in a plastic beaker on a magnetic stirrer, press Ti 3 AlC 2 The mass ratio of powder to hydrofluoric acid is 1:10. Add hydrofluoric acid with a concentration of 40wt% to the same beaker, set the stirrer speed to 200r / min, and then start stirring for 3 hours.

[0056] 1.2 Pour the etched solution into a centrifuge tube, then set the rotation speed to 4000r / min for centrifugation, take the precipitate, add deionized water to the precipitate for suction filtration and cleaning, repeat the cleaning 4 times, and then separate the solid phase The powder was heated at an ambient temperature of 100°C for 24 hours and dried continuously to obtain stacked lamellar Ti 3 C 2 Powder.

[0057] 1.3 will Ti 3 C 2 Put the powder into a glass beaker, then fill the mouth of the beaker with porous polyimide foam, and insert a funnel into the opening on the foam, and pour 20ml of liquid nitrogen into the funnel immediately after the beaker is ...

Embodiment 2

[0067] 2.1 will Ti 3 AlC 2 The powder is placed in a plastic beaker on a magnetic stirrer, press Ti 3 AlC 2 The mass ratio of powder to hydrofluoric acid is 1:10. Add hydrofluoric acid with a concentration of 40wt% to the same beaker, set the stirrer speed to 200r / min, and then start stirring for 3 hours.

[0068] 2.2 Pour the etched solution into a centrifuge tube, then set the rotation speed to 4000r / min for centrifugation, take the precipitate, add deionized water to the precipitate for suction filtration and cleaning, repeat the cleaning 4 times, and then separate the solid phase The powder was heated at an ambient temperature of 100°C for 24 hours and dried continuously to obtain stacked lamellar Ti 3 C 2 Powder.

[0069] 2.3 Will Ti 3 C 2 Put the powder into a glass beaker, then fill the mouth of the beaker with porous polyimide foam, and insert a funnel into the opening on the foam, and pour 20ml of liquid nitrogen into the funnel immediately after the beaker is ...

Embodiment 3

[0074] 3.1 Will Ti 3 AlC 2 The powder is placed in a plastic beaker on a magnetic stirrer, press Ti 3 AlC 2 The mass ratio of powder to hydrofluoric acid is 1:10. Add hydrofluoric acid with a concentration of 40wt% to the same beaker, set the stirrer speed to 200r / min, and then start stirring for 3 hours.

[0075] 3.2 Pour the etched solution into a centrifuge tube, then set the rotation speed to 4000r / min for centrifugation, take the precipitate, add deionized water to the precipitate for suction filtration and cleaning, repeat the cleaning 4 times, and then separate the solid phase The powder was heated at an ambient temperature of 100°C for 24 hours and dried continuously to obtain stacked lamellar Ti 3 C 2 Powder.

[0076] 3.3 Will Ti 3 C 2 Put the powder into a glass beaker, then fill the mouth of the beaker with porous polyimide foam, and insert a funnel into the opening on the foam, and pour 20ml of liquid nitrogen into the funnel immediately after the beaker is ...

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Abstract

The invention provides a method for stripping a Ti3C2 nanosheet. The method comprises the following steps: S1) mixing Ti3MC2 with hydrofluoric acid and carrying out a stirring reaction to obtain etched powder, wherein M is Al, Si or Ge; S2) heating the etched powder and then contacting the heated etched powder with a cryogenic liquid to obtain an intermediate; and S3) subjecting the intermediate to ultrasonic treatment in water to obtain the Ti3C2 nanosheet. Compared with the prior art, the invention has the following advantages: the cryogenic liquid is used as a medium, and the two-dimensional Ti3C2 nanosheet is stripped through high-speed rapid vaporization of the cryogenic liquid at a high temperature; the stripping method is simple in implementation process and controllable in processflow, has good promotion and application value, does not use toxic organic reagents such as dimethyl sulfoxide or dimethyl amide, realizes green stripping, and is greatly shortened in ultrasonic treatment time and low in energy consumption; and the method is an environment-friendly chemical preparation method and accords with the current trend of low-energy-consumption preparation.

Description

technical field [0001] The invention belongs to the technical field of two-dimensional materials, in particular to an exfoliated Ti 3 C 2 nanosheet method. Background technique [0002] Since the discovery of graphene, two-dimensional materials have become a major direction in material science research. As a new member of the family of two-dimensional materials, transition metal carbides MXenes have received increasing attention, where "M" stands for transition metals and "X" stands for nitrides or carbides. The most well-studied material in MXenes is Ti 3 C 2 . Ti 3 C 2 Usually by stripping Ti etched by hydrofluoric acid 3 AlC 2 owned. [0003] Since the discovery of MXenes materials, many excellent properties have been continuously reported. For example, the thermal conductivity of MXenes is similar to that of multilayer graphene. Density functional theory calculations show that MXenes are very hard (the in-plane elastic constant exceeds 500GPa), and have Flexib...

Claims

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Application Information

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IPC IPC(8): C01B32/921B82Y40/00
CPCB82Y40/00C01P2002/80C01P2004/03C01P2004/64
Inventor 虞锦洪吴宇明曹勇褚伍波林正得江南
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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