Strongly coupled gold nano superlattice structure and self-assembly preparation method thereof

Abstract

The invention discloses a strongly coupled gold nano superlattice structure and a self-assembly preparation method thereof. The superlattice structure is composed of a series of densely arranged icosidodecahedron gold nanoparticles, the average spacing between the particles is controlled from dozens of nanometers to several nanometers, the whole superlattice presents a monolayer film form, and twocharacterized plasma coupled formants exist in a visible-near infrared band range. The self-assembly preparation method combines the common effect of electrostatic and capillary adsorption. The reagents and instrument equipment selected by the invention are simple and easily available, and the self-assembly way is flexible and efficient. The prepared strongly coupled gold nano superlattice structure has an actual area up to cm<2> level, and has good repeatability. The strongly coupled gold nano superlattice structure and the preparation method provided by the invention lay the experimental foundation for constructing and designing functional novel optical materials and devices, and have important reference value for preparation of large-area superlattice by self-assembly of other form nanocrystalline structural units and application thereof.

Description

technical field [0001] The invention relates to the field of synthesis and preparation of functional nanometer materials, in particular to a gold nanometer superlattice structure with a strong coupling effect and a self-assembly preparation method thereof. Background technique [0002] In recent years, the use of chemical self-assembly technology to design the structure of colloidal nanoparticles to form various large-scale bulk superstructures has become a major research method for the effective preparation and engineering application of functional nanocomposites. Noble metal nano-superlattice structures with coupling effects, especially two-dimensional or three-dimensional supercrystalline films, can produce a variety of exotic physical properties under specific frequency electromagnetic waves, such as abnormal optical absorption or scattering, tunable near Field and distribution, directional plasmon polarization, etc., have attracted much attention in the whole chemical s...

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Problems solved by technology

[0003] Up to now, people have carried out some research work on the self-assembly of superlattice structures on noble metal nanoparticles with simple shapes (including spherical, rod-shaped, cubic, and octahedral), but due to the limitations of preparation methods, it is difficult to Precisely control the spacing of adjacent nanoparticles to the desired size range, resulting in possible surface plasmon coupling

Especially for single-layer noble metal superlattice film structures, the reported chemical self-assembly methods cannot effectively control the aggregation and distribution of nanoparticles, so characteristic coupling effects generally do not occur in these structures

People have tried to achieve superlattice structure and strong coupling by repeatedly stacking nanoparticles, but most of them ended in failure due to the complexity and instability of experimental operations.

In addition, for noble metal nanoparticles with complex shapes, such as hyperpolyhedral nanoparticles with high crystal facets, due to their usually exposed high surface energy and very limited preparation processes, there are few studies on chemical self-assembly of high crystal facets. Research on superlattice structure constructed by hyperpolyhedral nanoparticles and its related properties

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