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
CN102464295AInactive Publication Date: 2012-05-23HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
Publication Date
2012-05-23
Estimated Expiration
Not applicable · inactive patent

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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.
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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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