Silver nanoflake cluster array and preparation method thereof

A technology of silver nanosheets and arrays, which is applied in the field of preparation of precious metal micro-nano structures, can solve the problems of silver nanosheet additive pollution, difficult storage, agglomeration, etc., and achieve the effects of ensuring sample cleanliness, large specific surface area, and new synthesis methods

Active Publication Date: 2020-07-17
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product obtained by the solution method is silver nanosheet powder, which is easily deformed and agglomerated, and is not easy to store.
The electrodeposition method obtains silver nanosheet films dispersed on conductive substrates (conductive glass, gold-plated silicon wafers, etc.), and it is not easy to control the distribution of silver nanosheets
In addition, the surface of silver nanosheets synthesized by liquid phase method will inevitably be polluted by additives.

Method used

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  • Silver nanoflake cluster array and preparation method thereof
  • Silver nanoflake cluster array and preparation method thereof
  • Silver nanoflake cluster array and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The detailed process steps are as follows. (1) Using the gas-liquid-solid interfacial self-assembly method reported in the literature, a large-sized single-layer PS sphere colloidal crystal film was prepared on a clean glass slide. That is, PS ball (diameter 1 μm) suspension (2.5wt%) and ethanol are mixed evenly by ultrasound at a volume ratio of 1:1, and a clean glass slide is taken, and an appropriate amount of deionized water is added on top of it to form a large-area water film. About 0.1mL of the ball mixing solution was added to the surface of the water film, and the PS balls spontaneously self-assembled at the gas-liquid-solid interface to form a single-layer colloidal crystal film of several square centimeters. (2) Move the slide slowly at 45 ° After immersing in water, the PS sphere film will separate from the glass slide and float on the water surface. Take the clean silicon wafer and pick it up, and then transfer the PS sphere film to the silicon wafer. (3)...

Embodiment 2

[0039] Other steps and process conditions are identical with embodiment 1. The difference is that in step (3), the PS ball template / silicon chip was etched for different times, namely 0 min, 6 min and 9 min, and the influence of this parameter on the morphology of the silver nanosheet cluster array was investigated.

[0040] Figure 5It is the SEM photos of the copper triangular nanoparticle array (a-c) and the final silver nanosheet cluster array (d-f) obtained corresponding to the three etching times of the PS ball template / silicon wafer. Depend on Figure 5 a-c It can be seen that the size of copper triangular nanoparticles increases with the increase of etching time. Depend on Figure 5 It can be seen from e-f that the size of silver nanosheet clusters gradually increases and finally cross-links together, the density of silver sheets in the clusters increases, and the thickness and size of silver sheets (about 300 nm) increase. According to the growth mechanism of silv...

Embodiment 3

[0042] Other steps and process conditions are the same as in Example 1, the difference is that in step (6), the concentration of silver nitrate in the reaction solution is changed, i.e. 1mM and 100mM, and the concentration of citric acid is constant (50mM). Effect of array shape.

[0043] Figure 6 a and Figure 6 b SEM photographs of products corresponding to two silver nitrate concentrations, respectively. It can be seen that the concentration of silver nitrate is too low, and the silver is not easy to grow into flakes ( Figure 6 a), on the contrary, if the concentration is too high, the reaction will be too intense, which will affect the uniformity of the sample ( Figure 6 b). This indicates that the formation of silver flakes is the result of the growth rate competition of different crystal orientations, which is affected by the reaction rate.

[0044] According to the above experimental results, it can be known that silver nanosheet cluster arrays can be successful...

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Abstract

The invention discloses a silver nanoflake cluster array and a preparation method thereof. On the basis of the cheap and mature colloidal sphere template technology, the thermal evaporation technologyand a simple replacement reaction are combined, the silver nanoflake cluster array is synthesized controllably, and the cluster size, periodicity and the nanosheet size can be controlled. The obtained silver nanoflake cluster array is unique in structure, and the preparation method has the advantages of being simple, free of contamination, low in cost, capable of achieving mass production and thelike, and is expected to be applied actually.

Description

technical field [0001] The invention relates to a low-cost and macro-scale method for preparing silver nanosheet cluster arrays, which belongs to the field of preparation of precious metal micro-nano structures. Background technique [0002] As a main silver nanostructure, silver nanosheets have become the research object in many fields because of their excellent properties different from their bulk materials in terms of light, electricity, and catalysis. For example, in terms of detection based on the surface-enhanced Raman scattering (SERS) effect, silver nanosheets have three tunable resonance absorption peaks, a large specific surface area, and a tip effect at the edge of the sheet, so that they have a large SERS enhancement capability, It is an excellent SERS substrate. [0003] The reported preparation processes of silver nanosheets are divided into two categories: chemical means and physical means. Chemical means belong to the "bottom-up" process route, including so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/24G01N21/65
CPCB22F9/24G01N21/658B22F1/0551B22F1/054
Inventor 何辉程建祥范璐瑶杨金彭曾祥华
Owner YANGZHOU UNIV
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