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A method for generating metal coatings on controlled regions of atomic force microscope probe surfaces

An atomic force microscope and metal coating technology, applied in the direction of metal material coating process, coating, liquid chemical plating, etc., can solve the problems of rough coating, poor reproducibility and high cost, and achieve dense film, low cost and heavy weight. Highly visible effect

Active Publication Date: 2019-08-16
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

2) The tip of the needle tip must be sharp
However, these methods have their disadvantages at present, such as: high cost, rough coating, poor reproducibility, etc.

Method used

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  • A method for generating metal coatings on controlled regions of atomic force microscope probe surfaces
  • A method for generating metal coatings on controlled regions of atomic force microscope probe surfaces
  • A method for generating metal coatings on controlled regions of atomic force microscope probe surfaces

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] 1. The preparation of the high molecular polymer film containing hydrogen fluoride: poly(2-vinylpyridine) is selected as the high molecular polymer, and toluene is selected as the organic solution.

[0068] (1a) Surface treatment of silicon wafer: take and cut into 20×20mm 2 Silicon wafers of different sizes were ultrasonically washed three times with acetone, ethanol, and ultrapure water, each time for at least 5 minutes; The volume ratio of hydrogen is 7:3), soaking at 80-100°C for 30 minutes; finally washing with ultrapure water, N 2 Just blow dry;

[0069] (1b) Preparation of high molecular polymer film containing hydrogen fluoride: Add 10 mg / mL poly(2-vinylpyridine) toluene solution dropwise on the surface-treated silicon wafer, heat treatment at 60°C to obtain poly(2 -vinylpyridine) film, then dropwise add 1wt% HF solution drop by drop on the surface of the film, and let it stand in the air, after it dries, it will form a polymeric polymer containing hydrogen fl...

Embodiment 2

[0077] The specific experimental operation is as shown in Example 1, the only difference is that the depth of the probe tip piercing into the hydrogen fluoride film in step 2 is less than or equal to 2 μm.

[0078] figure 2 The SEM image of the metal coating at the activation site on the surface of the AFM probe tip prepared in Example 2 of the present invention. Depend on figure 2 It can be seen that the gold tip coating formed by the reaction on the surface of the AFM probe tip is about 16nm, and the tip radius of the tip is about 15nm. The gold tip coating is a uniform and dense coating of gold nanoparticles.

Embodiment 3

[0080] The specific experimental operation is as shown in Example 1, the only difference is that the depth of the probe tip piercing into the hydrogen fluoride film in step 2 is less than or equal to 3 μm; the reaction time in step 3 is 1 min, and the gold content is 0.1 mmol / L.

[0081] image 3 The SEM image of the metal coating at the activation site on the surface of the AFM probe tip prepared in Example 3 of the present invention. Depend on image 3 It can be seen that the gold tip coating formed by the reaction on the surface of the AFM probe tip is about 12nm, and the tip radius of the tip is about 10nm. The gold tip coating is a uniform and dense coating of gold nanoparticles.

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Abstract

The invention discloses a method for generating metal coatings in controllable regions of the surface of a probe of an atomic force microscope. According to the method for generating the metal coatings in the controllable regions of the surface of the probe of the atomic force microscope, metal deposition is carried out on the surface of a probe tip of the AFM by utilizing a chemical reduction treatment method, and a prepared metal film layer has the characteristics of being low in cost, compact, high in reproducibility, environmentally friendly and the like; the depth of the part, pricking into a thin film containing hydrogen fluoride, of the probe tip of the AFM is accurately controlled so that activation areas with different sizes can be obtained on the surface of the probe tip; then, the probe tip is immersed in a salt solution containing metal ions for chemical reduction reaction, and the coatings of different metals and with different thicknesses can be obtained by accurately controlling the deposition time and changing the concentration of the metal ions; and therefore, by controlling different conditions in an experiment, metal deposition can be carried out on the commercial probe tip of the AFM by adopting a chemical plating method so as to obtain the smooth TERS probe tip with different properties.

Description

technical field [0001] The invention belongs to the technical field of surface modification of atomic force microscope (AFM) probe tip, and in particular relates to a method for generating a metal coating on a controllable region on the surface of atomic force microscope (AFM) probe based on a reduction reaction. Background technique [0002] Raman spectroscopy is a common spectroscopic analysis method for detecting chemical bonds, symmetry or other chemical composition and structural information of sample molecules. It can provide fast, simple, repeatable, and non-destructive qualitative and quantitative analysis without too many steps to prepare the sample, and the sample can be measured directly through the fiber optic probe or through glass, quartz, or optical fiber. [0003] Tip-Enhanced Raman Spectroscopy (TERS) technology is a combination of Scanning Probe Microscopy (SPM) technology and Raman spectroscopy technology. TERS technology can meet the analysis requirement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/31C23C18/18
CPCC23C18/1834C23C18/31
Inventor 王栋赵智豪万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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