Two-dimensional flexible precious metal nanoparticle superlattice film and construction method and application thereof

A technology of nanoparticles and precious metals, applied in nanotechnology, nanotechnology, metal processing equipment, etc., can solve the problems of limiting the application range of flexible materials, difficult to transfer, etc., achieve good Raman enhanced detection effect, and avoid the difference of detection results Sexuality, the effect of ensuring consistency

Inactive Publication Date: 2020-03-24
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of application, most of the two-dimensional superlattice films reported in the literature are formed on hard or opaque substrates, so it is difficult to transfer to other substrates for performance characterization and construction of controllable optoelectronic devices, which limits Its scope of application as a flexible material

Method used

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  • Two-dimensional flexible precious metal nanoparticle superlattice film and construction method and application thereof
  • Two-dimensional flexible precious metal nanoparticle superlattice film and construction method and application thereof
  • Two-dimensional flexible precious metal nanoparticle superlattice film and construction method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1. Mix 5mL 0.2M CTAB aqueous solution and 5mL 0.5mM chloroauric acid aqueous solution thoroughly, add 0.6mL 0.01M sodium borohydride aqueous solution prepared with ice water, stir vigorously for 3-5 minutes to obtain the gold nanorod seed solution, 30℃ Let stand for 2 hours for later use; mix 25mL of a mixed aqueous solution containing 0.1M CTAB and 0.02M 5-bromosalicylic acid with 1.8mL of 4mM silver nitrate aqueous solution. Let stand at 30℃ for 15min, add 25mL of 1mM chloroauric acid aqueous solution, mix and stir. After 15 minutes, 0.2 mL of 64 mM ascorbic acid aqueous solution was added and mixed, the solution became colorless, 40 μL of the prepared seeds were added, and the mixture was mixed and placed at 30°C for 12 hours. Centrifuge the obtained gold nanorods and add an equal volume of deionized water to resuspend.

[0052] 2. Centrifuge the gold nanorods obtained in step 1 with 10mL, remove the supernatant and add the same amount of 80mM CTAC aqueous solution. Rep...

Embodiment 2

[0055] It is the same as embodiment 1, except that:

[0056] In step (1), when preparing the gold nanorod seed solution, the molar ratio of chloroauric acid, cetyltrimethylammonium bromide and sodium borohydride is 1:300:2, the reaction temperature is 25°C, and the reaction time 1h; when the gold nanorod solution is prepared from the gold nanorod seed solution, the moles of chloroauric acid, cetyltrimethylammonium bromide, 5-bromosalicylic acid, silver nitrate, ascorbic acid and the gold nanorod seed solution The ratio is 1:75:15:0.192:0.4:0.01, the reaction temperature is 25°C, and the reaction time is 10h.

[0057] In step (2), the reaction temperature of the reaction in the presence of ascorbic acid and silver nitrate is 70° C., the reaction time is 4 hours, and the mass ratio of gold nanorods, cetyltrimethylammonium chloride, ascorbic acid and silver nitrate It is 1:20:0.7:3.5.

[0058] In step (3), the mass ratio of the high aspect ratio gold core silver shell nanobrick soluti...

Embodiment 3

[0061] It is the same as embodiment 1, except that:

[0062] In step (1), when preparing the gold nanorod seed solution, the molar ratio of chloroauric acid, cetyltrimethylammonium bromide and sodium borohydride is 1:500:3, and gold is prepared from the gold nanorod seed solution In the nanorod solution, the molar ratio of chloroauric acid, cetyltrimethylammonium bromide, 5-bromosalicylic acid, silver nitrate, ascorbic acid and gold nanorod seed solution is 1:125:25:0.384:0.6 : 0.025.

[0063] In step (2), the mass ratio of the gold nanorods, cetyltrimethylammonium chloride, ascorbic acid and silver nitrate is 1:30:2.1:10.5.

[0064] In step (3), the mass ratio of the high aspect ratio gold core silver shell nanobrick solution and the mercapto group-containing modified polystyrene is 1:10.75. The concentration of the tetrahydrofuran solution containing mercapto-modified polystyrene is 3 mg / mL.

[0065] The prepared two-dimensional flexible superlattice film has similar properties to...

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Abstract

The invention discloses a two-dimensional flexible precious metal nanoparticle superlattice film and a construction method and application thereof. The superlattice film is constructed by self-assembling gold-core silver-shell nano-bricks with a high length-diameter ratio on a gas-liquid interface after surface ligand modification. According to the invention, the gold-silver bimetal nano brick with a high length-diameter ratio is used as a basic construction unit; a polymer-based ligand modification method is provided to regulate and control the complex acting force among anisotropic nanoparticles, and a substrate-free self-supporting two-dimensional superlattice film with macroscopic large scale and ordered microcosmic height is constructed through a gas-liquid interface self-assembly method; and the plasma coupling and electromagnetic field enhanced hot spot distribution are regulated and controlled through the nanoparticle morphology, shell layer size, particle spacing and the like,so that a flexible thin film material with controllable optical performance and Raman enhancement effect is constructed. The two-dimensional flexible superlattice film can be used as a surface enhanced Raman detection substrate, has an excellent Raman enhancement effect, and can be used for rapid detection of cancer markers and toxic chemical substances.

Description

Technical field [0001] The invention belongs to the technical field of nanomaterial synthesis and self-assembly, and specifically relates to a two-dimensional flexible noble metal nanoparticle superlattice film and a construction method and application thereof. Background technique [0002] Since the nanoparticle superlattice structure was first reported, researchers have used a series of nanoparticles (noble metals, quantum dots, magnetic nanoparticles, etc.) to construct superlattice structure materials of different dimensions, such as "nanoparticle assemblies", One-dimensional and three-dimensional materials such as "nanoparticle chain array" and "superlattice crystal". Two-dimensional metal nanoparticle superlattice film is one of the representative research fields. It consists of metal nanoparticles regularly arranged on a two-dimensional plane as the basic building blocks, and has a microscopic highly ordered structure and macroscopic unique photoelectric properties, such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B22F1/02G01N21/65B82Y30/00
CPCB22F9/24G01N21/658B82Y30/00B22F2009/245B22F1/054B22F1/17
Inventor 陈怡刘晃殷豪景顾宁
Owner SOUTHEAST UNIV
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