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Hollow ball micro/nano structure array with silver nano plates as basic elements and preparation method thereof

A technology of silver nanosheets and hollow spheres, which is applied in the field of hollow sphere micro/nano structure arrays and its preparation, can solve problems such as single shape and structure, difficulty in fully exerting SERS activity, etc., to ensure uniformity, enrich optical properties, The effect of enhancing activity

Inactive Publication Date: 2012-05-23
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, both the silver nanosheets in the two-dimensional noble metal nanomaterials and their preparation methods have shortcomings. First, although the silver nanosheets standing on the gold film have rich optical properties, they are difficult to obtain because of the gold film and the silver nanosheets. The surface of the material composed of silver nanosheets is only a single shape and structure, so it is difficult to fully exert the activity of SERS; changing material

Method used

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  • Hollow ball micro/nano structure array with silver nano plates as basic elements and preparation method thereof
  • Hollow ball micro/nano structure array with silver nano plates as basic elements and preparation method thereof
  • Hollow ball micro/nano structure array with silver nano plates as basic elements and preparation method thereof

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Embodiment 1

[0027] The concrete steps of preparation are:

[0028] Step 1, first attach polystyrene colloidal balls with a diameter of 2 μm to the surface of the substrate to form afigure 1 The single-layer colloidal crystal template shown in a; wherein, the substrate is a semiconductor silicon wafer. Then, a gold film with a thickness of 15 nm was deposited on the surface of the single-layer colloidal crystal template.

[0029] Step 2, first place the single-layer colloidal crystal template with a gold film on the surface in the silver electrolyte, use it as the cathode, and the graphite sheet as the anode, at a current density of 3 μA / cm 2 Electrodeposition under 15h; Wherein, the composition of silver electrolyte is the silver nitrate of 0.5g / L, the sodium citrate of 1.5g / L and the polyvinylpyrrolidone of 4.5g / L, the electrodeposition current is constant current, and polyvinylpyrrolidone is Polyvinylpyrrolidone K30. Then it was washed and then dried; wherein, the cleaning was washed ...

Embodiment 2

[0032] The concrete steps of preparation are:

[0033] Step 1, first attach polystyrene colloidal balls with a diameter of 2 μm to the surface of the substrate to form a figure 1 The single-layer colloidal crystal template shown in a; wherein, the substrate is a semiconductor silicon wafer. Then, a gold film with a thickness of 18nm was vapor-deposited on the surface of the single-layer colloidal crystal template.

[0034] Step 2, first place the single-layer colloidal crystal template with a gold film on the surface in the silver electrolyte, use it as the cathode, and the graphite sheet as the anode, at a current density of 4 μA / cm 2 Electrodeposition under 13.5h; Among them, the composition of silver electrolyte is 0.8g / L silver nitrate, 1.3g / L sodium citrate and 4.8g / L polyvinylpyrrolidone, the electrodeposition current is constant current, polyvinylpyrrolidone It is polyvinylpyrrolidone K30. Then it was cleaned and then dried; wherein, the cleaning was washed twice wit...

Embodiment 3

[0037] The concrete steps of preparation are:

[0038] Step 1, first attach polystyrene colloidal balls with a diameter of 2 μm to the surface of the substrate to form a figure 1 The single-layer colloidal crystal template shown in a; wherein, the substrate is a semiconductor silicon wafer. Then, a gold film with a thickness of 20 nm was deposited on the surface of the single-layer colloidal crystal template.

[0039] Step 2, first place the single-layer colloidal crystal template with a gold film evaporated on the surface in the silver electrolyte, use it as the cathode, and the graphite sheet as the anode, at a current density of 5 μA / cm 2 Electrodeposition for 12 hours; Among them, the composition of the silver electrolyte is 1g / L silver nitrate, 1g / L sodium citrate and 5g / L polyvinylpyrrolidone, the electrodeposition current is a constant current, and the polyvinylpyrrolidone is polyvinylpyrrolidone K30. Then it was washed and then dried; wherein, the cleaning was washe...

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Abstract

The invention discloses a hollow ball micro / nano structure array with a plurality of silver nano plates as basic elements and a preparation method thereof. In the array, a hollow gold ball array is arranged on a substrate, fan-shaped silver nano plates are arranged on gold ball shells in a crossing and standing way, wherein the inside diameter of the gold ball shells is 1-10mu m, the thickness of the gold ball shells is 15-25nm, the height of the fan-shaped silver nano plates is 500mn to 1mu m, the width of the fan-shaped silver nano plates is 200-500nm, the thickness of the fan-shaped silver nano plates is 20-30nm, and the gold ball shells are made of single silver crystal. In the method, polystyrene colloidal balls with the diameter being 1-10mu m are attached to the surface of the substrate at first to form a single-layer colloidal crystal template, a gold film is evaporated on the surface of the single-layer colloidal crystal template, the single-layer colloidal crystal template with the evaporated gold film on the surface is placed in silver electrolyte for electrodeposition, intermediate products are obtained after cleaning and drying and are then placed in dichloromethane solution to dissolve polystyrene colloidal balls, and thus the hollow ball micro / nano structure array with the silver nano plates as the basic elements is prepared. The hollow ball micro / nano structure array can be used as an SERS (surface enhanced Raman scattering) active substrate for rapid trace detection of a variety of organic pollutants.

Description

technical field [0001] The invention relates to a hollow sphere micro / nano structure array and a preparation method thereof, in particular to a hollow sphere micro / nano structure array with silver nanosheets as a unit and a preparation method thereof. Background technique [0002] Under the action of an external alternating electromagnetic field, the free electrons on the surface of nano-units such as noble metal silver will be polarized and collectively oscillated. When the frequency of the applied electromagnetic field is equal to the oscillation frequency of free electrons, the phenomenon of surface plasmon resonance (SPR) will occur. The SPR effect can significantly increase the local electromagnetic field strength. Therefore, when some molecules are adsorbed on the surface of noble metal silver nanoparticles, the Raman scattering signal will be amplified many times, that is, the surface-enhanced Raman (SERS) effect will be generated. The SERS effect of precious metal ...

Claims

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Application Information

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IPC IPC(8): B81B7/04B81C1/00C25D3/46C23C14/24C23C14/20
Inventor 刘广强蔡伟平段国韬王晶晶
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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