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Carbide crystal material with two-dimensional lamellar structure and preparation method thereof

A technology of two-dimensional sheet and crystal materials, which is applied in the growth of polycrystalline materials, chemical instruments and methods, and crystal growth, and can solve the problems of few studies and reports on two-dimensional transition metal carbides.

Active Publication Date: 2015-07-08
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

[0006] So far, except for MXene materials, there are few studies and reports on other two-dimensional transition metal carbides.
Moreover, the precursors used in the synthesis of current MXene materials can generally only be MAX phase materials with Al as the A site.

Method used

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  • Carbide crystal material with two-dimensional lamellar structure and preparation method thereof
  • Carbide crystal material with two-dimensional lamellar structure and preparation method thereof
  • Carbide crystal material with two-dimensional lamellar structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] In this embodiment, the carbide crystal material having a two-dimensional sheet structure is a ZrC nanosheet, and in the ZrC nanosheet, the atomic ratio of the Zr element to the C element is less than or equal to 1.

[0039] The preparation steps of this ZrC nanosheet are as follows:

[0040] (1) with Zr 3 Al 3 C 5 Ceramic materials as precursor materials;

[0041] The Zr 3 Al 3 C 5 The preparation method of the ceramic material is as described in the literature (Zhou, J. et al. J. Am. Ceram. Soc., 2014, 97, 1296.);

[0042] (2) Crushing the precursor material, passing through a 300-mesh sieve after grinding, to obtain a precursor powder with uniform particle size distribution;

[0043] (3) Select a hydrofluoric acid aqueous solution with a concentration of 50wt.% as the corrosive agent, slowly add 1 g of the precursor powder in an ice-water bath to a plastic bottle containing 10 mL of the corrosive agent, mix it uniformly and let it stand for 72 hours, and Stir...

Embodiment 2

[0055] In this embodiment, as in Embodiment 1, the carbide crystal material having a two-dimensional sheet structure is ZrC nanosheet, and in the ZrC nanosheet, the atomic ratio of Zr element to C element is less than or equal to 1.

[0056] The preparation method of the ZrC nanosheets is basically the same as in Example 1, except that in step (3), a hydrofluoric acid aqueous solution with a concentration of 25 wt.% is selected as the etchant.

[0057] Same as Example 1, utilize X-ray diffraction spectrum (XRD) to detect respectively through step (3) before corroding, in step (3) after mixing with etchant 18h, and in step (3) after mixing with etchant 72h powder Changes in phase and crystal structure of the body; Utilize scanning electron microscope (SEM) to observe before step (3) corrosion, after mixing with etchant in step (3) for 18h, and after mixing with etchant in step (3) for 72h powder morphology changes.

[0058] XRD test results such as figure 1 Shown in, this str...

Embodiment 3

[0062] In this embodiment, the carbide crystal material having a two-dimensional sheet structure is HfC nanosheet, and the atomic ratio of Hf element to C element in the HfC nanosheet is less than or equal to 1.

[0063] The preparation steps of this HfC nanosheet are as follows:

[0064] (1) The chemical molecular formula is Hf 2 [Al 1-x (Si) x ] 4 C 5 (The ceramic material of (as precursor material, wherein x=0,0.02,0.05,0.1;

[0065] The Hf 2 [Al 1-x (Si) x ] 4 C 5 The preparation method of ceramics is as described in the literature (Zhou, J. et al. J. Am. Ceram. Soc., 2014, 97, 1296.), where the elemental components and sintering temperature are shown in Table 1 below.

[0066] Table 1: Hf 2 [Al 1-x (Si) x ] 4 C 5 Raw material ratio and sintering temperature (x=0, 0.02, 0.05, 0.1)

[0067]

[0068] (2) Crushing the precursor material, passing through a 300-mesh sieve after grinding, to obtain a precursor powder with uniform particle size distribution;

...

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Abstract

The invention provides a carbide crystal material with a two-dimensional lamellar structure. The carbide crystal material with the two-dimensional lamellar structure is composed of transition metal elements and carbon element, and the atomic ratio of the transition metal elements to the carbon element is less than or equal to 1. According to the preparation method of the carbide crystal material with the two-dimensional lamellar structure, ternary or polybasic Zr / Hf / Y-Al / Si / Ge-C lamellar ceramic material is used as a precursor and is subjected to selective corrosion so that an Al-C lamella with a weak valence bond can be peeled off and corroded, thus obtaining the carbide crystal material with the two-dimensional lamellar structure. The method is simple and practicable, and has the advantage that the composition elements, element stoichiometric ratio, morphology and structure of the carbide crystal material with the two-dimensional lamellar structure are all designable and controllable. The carbide crystal material with the two-dimensional lamellar structure has good applications in the fields of electrode materials for electrochemical energy storage, functional macromolecular conductive fillers, sensors, catalysts, transparent conductors and the like.

Description

technical field [0001] The invention belongs to the technical field of two-dimensional crystal materials, and in particular relates to a carbide crystal material with a two-dimensional sheet structure and a preparation method thereof. Background technique [0002] Two-dimensional crystal materials have a high specific surface area, and at the same time show the unique electronic structure and properties of low-dimensional materials, and have attracted more and more attention in recent years. Graphene is currently the most studied two-dimensional crystal, it is a kind of carbon atom with sp 2 A new type of two-dimensional atomic crystal composed of hybridized monoatomic layers, its ultra-high electrical conductivity, thermal conductivity, high in-plane mechanical properties and up to 97.7% optical transmittance make it suitable for field effect transistors, transparent electronic devices, Electrochemical energy storage and polymer composite materials have shown great applica...

Claims

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Application Information

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IPC IPC(8): C30B29/36C30B29/64
CPCC30B29/36C30B29/64
Inventor 黄庆陈科陈苒周小兵叶群于海澄
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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