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

A gold nano, superlattice technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, which can solve the surface plasmon coupling, the complexity of experimental operation, and the difficulty of precisely controlling adjacent nanometers. The problem of particle spacing reaching the ideal size range, etc., achieves the effect of simple and easy-to-obtain equipment, flexibility, high efficiency and repeatability

Active Publication Date: 2018-02-16
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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

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Embodiment 1

[0030]Embodiment 1, the self-assembly preparation process of the strongly coupled gold nano-superlattice structure of the present invention comprises the following steps:

[0031] 1. Place the square substrate (ordinary glass or silicon wafer) in sequence in analytically pure toluene solution, anhydrous methanol solution, anhydrous ethanol solution and deionized water solution for ultrasonic cleaning, each cleaning time is 10min. After cleaning the substrate, dry it with high-purity nitrogen;

[0032] 2. Place the substrate treated in step 1 in the boiling solution of piranha for 15 minutes of surface negative charge hydroxylation treatment, then take out the substrate and dry it again with high-purity nitrogen;

[0033] 3. After step 2 is completed, the substrate is vertically immersed in an anhydrous ethanol solution of positively charged docosahedral gold nanoparticles (particle size about 85nm) at a saturated concentration, and then the substrate is recharged at a speed of...

Embodiment 2

[0036] Example 2, preparation process for self-assembly of strongly coupled gold nano-superlattice structure based on structural units of different sizes

[0037] Refer to Example 1 for other implementation conditions and steps. In the above embodiment, the 85nm dodecahedral gold nanoparticle units are replaced by 64nm and 98nm respectively, and strongly coupled gold nano-superlattice structures of structural units of different sizes can be obtained, such as figure 2 , as shown in 3. in figure 2 (a), figure 2 (b) are the scanning electron microscope (SEM) image and the visible-near-infrared (Vis-NIR) extinction spectrum image of the strongly coupled gold nano-superlattice structure based on large-scale structural units, respectively, image 3 (a), image 3 (b) are scanning electron microscope (SEM) images and visible-near-infrared (Vis-NIR) extinction spectra of strongly coupled gold nano-superlattice structures based on small-scale structural units, respectively. It c...

Embodiment 3

[0038] Example 3, Self-assembly preparation process of strongly coupled gold nano-superlattice structure containing different nanoparticle spacing

[0039] Refer to Example 1 for other implementation conditions and steps. In the above-mentioned embodiment, the speed of the vertical separation of the substrate from the self-assembly solution is adjusted to 20mm / min and 0.8mm / min respectively, and a strongly coupled gold nano-superlattice structure containing different nanoparticle spacings can be obtained, such as Figure 4 , shown in 5, where Figure 4 (a), Figure 4 (b) Scanning electron microscope (SEM) image and visible-near-infrared (Vis-NIR) extinction spectrum image of strongly coupled gold nano-superlattice structure with large nanoparticle spacing, respectively, Figure 5 (a), Figure 5 (b) are scanning electron microscope (SEM) images and visible-near-infrared (Vis-NIR) extinction spectra of strongly coupled gold nano-superlattice structures with smaller nanopartic...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/68C30B29/02C30B19/00B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C30B19/00C30B29/02C30B29/68
Inventor 张海斌刘红
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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