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A construction method and application of a controllable micro-nano array based on gold-silver nanobricks

A construction method and technology of gold nanorods, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, can solve the problems of easy agglomeration and low order, and achieve high electromagnetic field coupling enhancement coefficient. Effect

Active Publication Date: 2020-11-17
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a construction method and application of a controllable micro-nano array based on gold-silver nano-bricks, which overcomes the problems of easy agglomeration, low order, and limited Due to the shortcomings of ordered assembly at the micron level, the controllable micro-nano array can be used for highly sensitive detection of trace chemical molecule residues, and the detection signal has the advantages of uniformity and repeatability

Method used

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  • A construction method and application of a controllable micro-nano array based on gold-silver nanobricks
  • A construction method and application of a controllable micro-nano array based on gold-silver nanobricks
  • A construction method and application of a controllable micro-nano array based on gold-silver nanobricks

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Effect test

Embodiment 1

[0031] A method for constructing a controllable micro-nano array based on gold-silver nanobricks, the specific steps are as follows:

[0032] (1) Controllable synthesis of nanobricks with gold-silver bimetallic core-shell structure: firstly, gold nanorods were synthesized, which were prepared by seed-induced growth method. First, chloroauric acid (HAuCl 4 ), cetyltrimethylammonium bromide (CTAB) and sodium borohydride (NaBH 4 ) reduction to generate gold seeds, and then in silver nitrate (AgNO 3 ), L-ascorbic acid (AA), and CTAB growth solution were reacted in a water bath at 30°C for 2 hours, and the concentration of the obtained gold nanorods was about 4nM, and the size was about 47nm×20nm. With this concentration of gold nanorods as the core, centrifuge at 6500rpm for 20min, remove the supernatant, add 10mL 80mM cetyltrimethylammonium chloride (CTAC) aqueous solution, oscillate evenly, and let stand for more than 12h. Then put it in a 60°C water bath, stir at a medium spe...

Embodiment 2

[0037] The controllable micro-nano array based on gold-silver nano-bricks prepared in Example 1 can be adjusted in structure, and two array structures with different widths (single nano-brick width and multiple nanobrick widths).

[0038] In the step (3) of embodiment 1, when the treatment time of oxygen plasma processor is 5min, can form the ordered array that is arranged into by single nano-brick width (about 70nm), as figure 2 (a) and figure 2 Shown in (b); When the treatment time of oxygen plasma processor is 15min, can form the orderly array that is arranged into by a plurality of nano brick widths (about 150nm), as figure 2 (c) and figure 2 As shown in (d); its microstructure can be characterized by scanning electron microscopy (SEM), proving the controllability and large-area ordered assembly of its micro-nano array structure.

Embodiment 3

[0040] The controllable micro-nano array based on gold-silver nanobricks prepared in Example 1 can be applied to the highly sensitive detection of trace chemical molecules. In this example, 4-aminothiophenol (4-ATP) was selected as an exemplary target molecule, and 4-ATP solutions with gradient concentrations of 1 μM, 100 nM, 10 nM, 1 nM, and 0.1 nM were prepared. Take 0.5mL of 4-ATP solution of each concentration gradient in a centrifuge tube, and drop 5μL each onto the gold-silver nanobrick micro-nano array chip. After the solution is evaporated to dryness, it is used for Raman spectrum signal detection. image 3 It shows that its lowest detection limit can be as low as 1nM.

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Abstract

The invention discloses an establishing method of a controllable micro-nano array based on gold and silver nanometer bricks and an application thereof. According to the method, the gold and silver double-metal nanometer bricks in the nucleocapsid structure are regulated and controlled through a polymer-based ligand modification method, and the uniform-spacing assembling linear array structural distribution of the nanometer bricks can be realized. By employing a PDMS micro-nano stripe preparation technology based on a two-step method, the gold and silver nanometer bricks are guided to assemblea uniform and ordered array structure in a micro-nano stripe from top to bottom, and a macroscopic large-area ordered array of a single nanometer brick width (70nm) and a plurality of nanometer brickwidths (150nm) can be prepared. According to the method, the controllable micro-nano array based on the gold and silver nanometer bricks has a uniform nanometer particle spacing distribution characteristic, high electromagnetic field coupling enhancement coefficient between nanometer particles and the Raman enhancement effect with uniform distribution are achieved, high-sensitivity detection of remaining trace chemical molecules can be conducted, and detection signals are uniform and repetitive.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial synthesis and self-assembly, and in particular relates to a construction method and application of a controllable micro-nano array based on gold-silver nano-bricks. Background technique [0002] Noble metal nanoparticles exhibit optoelectronic properties such as small size effect, surface effect, and surface plasmon resonance (SPR), which are different from macroscopic materials, and their SPR performance can be adjusted by adjusting the metal type, particle morphology and size, and the nature of the environment. Controllable design provides a wider range of building blocks for nano-assembled materials. On the basis of controllable synthesis of functional metal nanoparticles, how to construct new nanoparticle assembly materials with special array structure and functional controllability on the microscopic scale through simple and effective self-assembly and nanofabrication methods is still a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00G01N21/658
Inventor 陈怡刘晃殷豪景顾宁
Owner SOUTHEAST UNIV
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