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Ultrafast laser pulse method for forming nanopores with diameters of 2 nanometers

A metal nano and ultrafast laser technology, applied in the field of nanomaterials, can solve the problems of inability to prepare metal nanopore structures and nanostructures

Active Publication Date: 2012-11-28
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is that all current methods of ablation in laser solutions can only produce near-spherical structures, and nanostructures of other shapes cannot be prepared; photochemical reduction methods and heat treatment techniques can be used to prepare metal nanostructures of different shapes. structure, but cannot prepare metal nanopore structures with a scale smaller than 5nm, and provide a technology for preparing metal nanopores with a diameter of 2nm by ultrafast laser pulse method, which can be used in a wide range of fields and meet different application requirements

Method used

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  • Ultrafast laser pulse method for forming nanopores with diameters of 2 nanometers
  • Ultrafast laser pulse method for forming nanopores with diameters of 2 nanometers
  • Ultrafast laser pulse method for forming nanopores with diameters of 2 nanometers

Examples

Experimental program
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Effect test

Embodiment 1

[0041]First accurately weigh the PVP powder equivalent to the sodium citrate crystal of the corresponding quality of 0.3mmol and the PVP powder of the corresponding quality of 0.1mmol with an electronic balance, and the deionized water of 11.03mL is used to dissolve the two kinds of medicaments in a beaker to form a uniform mixed solution ( The volume of the mixed solution can be more, but to ensure that the concentration of the two reagents is constant), that is, the chemical coating solution.

[0042] In order to ensure the consistency of the silver sheet target used in the ablation experiment, before each experiment, it was washed three times with deionized water, then rinsed with absolute ethanol, and finally dried for use. In order to ensure the cleanliness of the petri dish, before the experiment, the surface dish was ultrasonically cleaned for 30 minutes, then rinsed with deionized water three times, and finally dried in a drying oven for use in the experiment.

[0043]...

Embodiment 2

[0049] First accurately weigh the PVP powder equivalent to the sodium citrate crystal of the corresponding quality of 0.3mmol and the PVP powder of the corresponding quality of 0.1mmol with an electronic balance, and the deionized water of 11.03mL is used to dissolve the two kinds of medicaments in a beaker to form a uniform mixed solution ( The volume of the mixed solution can be more, but to ensure that the concentration of the two reagents is constant), that is, the chemical coating solution.

[0050] In order to ensure the consistency of the gold sheet target used in the ablation experiment, before each experiment, the size 10×10×0.5mm 3 The gold flakes with a purity of 99.99% were mechanically polished (using 1000# sandpaper), washed three times with deionized water, rinsed with absolute ethanol, and finally dried for use. In order to ensure the cleanliness of the petri dish, before the experiment, the surface dish was ultrasonically cleaned for 30 minutes, then rinsed wi...

Embodiment 3

[0055] First accurately weigh the PVP powder equivalent to the sodium citrate crystal of the corresponding quality of 0.3mmol and the PVP powder of the corresponding quality of 0.1mmol with an electronic balance, and the deionized water of 11.03mL is used to dissolve the two kinds of medicaments in a beaker to form a uniform mixed solution ( The volume of the mixed solution can be more, but to ensure that the concentration of the two reagents is constant), that is, the chemical coating solution.

[0056] In order to ensure the consistency of the platinum sheet target used in the ablation experiment, before each experiment, the size 10×10×0.5mm 3 , a platinum sheet with a purity of 99.99% was mechanically polished (using 1000# sandpaper), then washed three times with deionized water, then rinsed with absolute ethanol, and finally dried for use. In order to ensure the cleanliness of the petri dish, before the experiment, the surface dish was ultrasonically cleaned for 30 minutes...

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Abstract

The invention provides an ultrafast laser pulse method for forming nanopores with the diameters of 2 nanometers. The thickness of a metal film layer where the ultra small nanopores with the diameters of 2 nanometers is formed is about 3nm, the nanopores are discretely formed in the metal film layer, and the diameter of each nanopore is about 2nm. The ultrafast laser pulse method comprises the following steps of: dissolving a sodium citrate crystal and poly-vinyl pyrrolidone (PVP) powder in deionized water to form a chemical coating solution; putting a metal sheet into watch glass, and injecting the chemical coating solution into the upper surface of the metal sheet; putting the watch glass near a focal distance of a condenser in a light path, ablating by using an ultrafast laser pulser to obtain suspension containing metal nano products, dripping the suspension containing the metal nano products to a copper screen covered by a carbon film, and drying to obtain the ultra small nanopore; and a metal film in which the ultra small nanopore are formed is applied to porous metal mask plates during near-field imaging with aperture probes, surface-enhanced Raman scattering, detection of single-pore biomolecules and the like.

Description

technical field [0001] The invention relates to a method for preparing ultra-small metal nanoholes with a diameter of 2nm by using an ultrafast laser pulse method, and belongs to the technical field of nanometer materials. Background technique [0002] In recent years, the discrete single nanopore structure has more and more extensive application prospects in the basic research and applied research of nanotechnology, especially in the nanophotonics related to plasmons, the band on the top of the localized probe tip. The metal mask of the hole, the detection and detection of single molecules such as biological macromolecules have attracted much attention. For example, technologies for the rapid detection of individual DNA molecules typically use individual ultra-small diameter nanopores through which DNA molecules are rapidly sequenced as they pass through them. [0003] Existing techniques for preparing ultra-small diameter nanopores include focused ion beam lithography (FI...

Claims

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Application Information

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IPC IPC(8): B82B3/00B82Y40/00G01N33/48
Inventor 田义超边飞王瑞武睿杨怀馨孟胜徐红星陆兴华赵继民
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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