Dry method for preparing TEM (Transmission Electron Microscope) sample of two-dimensional material

A technology of two-dimensional materials and samples, which is applied in the field of TEM samples of two-dimensional materials by dry method, can solve the problems of sample fold overlap, sample folds, amorphous layer, etc., so as to save the time of removing the transfer medium and ensure non-pollution , the effect of simple operation

Active Publication Date: 2017-05-31
EAST CHINA NORMAL UNIV
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  • Application Information

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Problems solved by technology

However, this operation is very easy to introduce new pollutants, or the sample takes a long time to cause chemical reactions in the sample, or improper operation during the soaking process, such as improper insertion angle and improper force, which cause the sample to wrinkle, etc. The solution on the sample is also very easy to introduce new pollutants during the evaporation process, which will introduce new uncertainties to the observation of subsequent samples, such as folds and overlaps of samples, severe amorphous layers, structural changes, etc.

Method used

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  • Dry method for preparing TEM (Transmission Electron Microscope) sample of two-dimensional material
  • Dry method for preparing TEM (Transmission Electron Microscope) sample of two-dimensional material
  • Dry method for preparing TEM (Transmission Electron Microscope) sample of two-dimensional material

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Embodiment 1

[0031] The two-dimensional material of this embodiment selects molybdenum disulfide block, refer to figure 1 , the specific preparation process is as follows:

[0032] Step 1: Mechanical peeling, using blue film tape 1 to tear off a piece of molybdenum disulfide sheet from the surface of molybdenum disulfide block material with bright surface and less damage, and then glued and separated six times to find that the sample-intensive area 2 on the tape is relatively Dense, and basically no metallic luster, such as figure 1 (a).

[0033] Step 2: Select a clean experimental glass slide 3, wash it with deionized water, and put it in an oven to dry. Use scissors to cut off a square PDMS gel sheet 4 smaller than the width of the slide, hold the gel sheet with tweezers, peel off the protective layer, and stick it carefully on the transparent end of the slide. During the sticking process, the PDMS gel sheet 4 Keep it flat without wrinkles and air bubbles, such as figure 1 (b).

[0...

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Abstract

The invention discloses a dry method for preparing a TEM sample of a two-dimensional material. The method comprises the following steps: peeling a two-dimensional material sheet from the surface of the two-dimensional material by an adhesive tape, repeatedly adhering and separating until the sheet presents a dense sample area, and adhering a glass slide and PDMS (Polydimethylsiloxane) gel tablet, so that the PDMS gel surface is adhered to the adhesive tape dense sample surface, and the adhesive tape is peeled; and taking a micro grid, and transferring the sample on the PDMS gel tablet onto the micro grid under an optical microscope, thereby obtaining the TEM sample of the two-dimensional material. According to the method disclosed by the invention, any pollutant is not introduced in the operating process, the topographic characteristics and structural properties of the two-dimensional material are not damaged, and the method has the characteristics of flexibility, simple operation and capacity of efficiently obtaining the TEM sample of the sheet two-dimensional material.

Description

technical field [0001] The invention relates to the field of preparation and characterization of nanometer materials, and relates to a method for making TEM samples of two-dimensional materials by a dry method. Background technique [0002] Two-dimensional materials refer to materials in which electrons can only move freely (planar motion) on the non-nanoscale (1-100nm) in two dimensions, such as nanofilms, superlattices, and quantum wells. Two-dimensional layered materials represented by graphene and molybdenum disulfide exhibit extremely rich optical, electrical, magnetic and catalytic activities, and have broad application prospects in new energy, new materials, and electronic devices. Transmission electron microscope (TEM) is an effective tool for studying nanomaterials including molybdenum disulfide. Its resolution is much higher than that of optical microscope, which can reach 0.1-0.2nm, and its magnification is tens of thousands to millions of times. TEM sample prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
CPCG01N1/2813G01N1/286
Inventor 吴幸骆晨
Owner EAST CHINA NORMAL UNIV
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