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Silver nano-disc, its preparation method, and gold nano-ring and assembly prepared by using the same

A silver nano-wafer technology, applied in the field of nano-materials, can solve the problems of unfavorable product promotion, low product quality, uneven ring shape, etc.

Active Publication Date: 2019-03-12
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this scheme can produce gold nanorings, the center of the synthesized gold nanorings is not strictly hollow, and there are adhesions in the middle, and the shape of the gold nanorings is relatively rough, and the shape of the rings is uneven. The product quality is relatively low, which is not conducive to the promotion of products

Method used

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  • Silver nano-disc, its preparation method, and gold nano-ring and assembly prepared by using the same
  • Silver nano-disc, its preparation method, and gold nano-ring and assembly prepared by using the same
  • Silver nano-disc, its preparation method, and gold nano-ring and assembly prepared by using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] (1) Synthesis of silver nanodiscs and gold nanorings

[0127] (a) Synthesis of silver seeds

[0128] Mix 200mL ultrapure water, 100μL, 0.05M silver nitrate, 12mL, 100mM sodium citrate, and 240μL hydrogen peroxide in a 500mL beaker, then add freshly prepared 2.4mL, 0.05M sodium borohydride. The solution was stirred slowly for 5 min, and then incubated at 4°C for 2 h in the dark. The synthesized silver seeds were centrifuged at 14000 revolutions per minute (rpm) for 10 min, and the precipitate was collected for subsequent synthesis of silver nanodiscs.

[0129] (b) Synthesis of silver nanodiscs

[0130]Add 22 mL of ultrapure water, 10 mL of acetonitrile, 100 μL of 0.05M ascorbic acid, 100 μL of 0.05M sodium citrate into a 100 mL beaker, and stir vigorously. Add the silver seeds synthesized by the above method, and 120 μL, 0.1M silver nitrate. The mixed solution was vigorously stirred for 30 min, and the obtained silver nanodiscs were centrifuged at 12000 rpm for 20 mi...

Embodiment 2

[0141] (1) Synthesis of silver nanodiscs and gold nanorings

[0142] (a) Synthesis of silver seeds

[0143] Mix ultrapure water (400mL), silver nitrate (300μL, 1M), sodium citrate (24mL, 100mM), hydrogen peroxide (2mL) in a 1000mL beaker, and then add freshly prepared sodium borohydride (0.6mL, 2M) . The solution was stirred slowly for 10 min, and then incubated at 4° C. for 3 h in the dark. The synthesized silver seeds were centrifuged at 12000 rpm for 20 min, and the precipitate was collected for subsequent synthesis of silver nanodiscs.

[0144] (b) Synthesis of silver nanodiscs

[0145] Add 22 mL of ultrapure water, 10 mL of acetonitrile, 150 μL of 0.1M ascorbic acid, 100 μL of 0.05M sodium citrate into a 100 mL beaker, and stir vigorously. Add the silver seeds synthesized by the above method, and 120 μL, 0.1M silver nitrate. The mixed solution was vigorously stirred for 30 min, and the obtained silver nanodiscs were centrifuged at 10,000 rpm for 30 min, and dissolved...

Embodiment 3

[0164] (1) Synthesis of silver nanodiscs and gold nanorings

[0165] (a) Synthesis of silver seeds

[0166]Mix ultrapure water (400mL), silver nitrate (300μL, 0.1M), sodium citrate (12mL, 75mM), hydrogen peroxide (480μL) in a 500mL beaker, and then add freshly prepared sodium borohydride (1.2mL, 0.5 M). The solution was stirred slowly for 10 min, and then incubated at 4° C. for 3 h in the dark. The synthesized silver seeds were centrifuged at 12000 revolutions per minute (rpm) for 30 min, and the precipitate was collected for subsequent synthesis of silver nanodiscs.

[0167] (b) Synthesis of silver nanodiscs

[0168] Add 88mL ultrapure water, 20mL acetonitrile, 600μL, 0.1M ascorbic acid into a 200mL beaker, and stir vigorously. Add the silver seeds synthesized by the above method, and 480 μL, 0.1M silver nitrate. The mixed solution was vigorously stirred for 30 min, and the obtained silver nanodiscs were centrifuged at 12000 rpm for 20 min, and dissolved in 24 mL of 1 mg...

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Abstract

The invention discloses a silver nanometer disc, a preparation method thereof, and a gold nanometer ring and an assembly prepared by using the same. The method comprises: mixing and stirring water, acetonitrile, sodium citrate and ascorbic acid in an appropriate proportion, adding silver seeds and nitric acid silver solution, stirring to obtain silver nano-discs; selective deposition of gold on the edge of silver nano-discs by electrochemical replacement method under the control of alkaline hydroxylamine hydrochloride, and then using etchant to oxidize and etch silver to obtain solution Free gold nanorings. The gold nanoring of the invention has a hollow structure, uniform size, good dispersibility, and adjustable size and wall thickness. The present invention also provides an assembly containing gold nano-rings. By controlling the size of nano-gold particles and the ratio of nano-gold particles and gold rings, after annealing, separation and purification, Saturn structure, diamond ring structure and bow tie structure assembly can be constructed. It has broad application prospects in the fields of surface-enhanced substrates, biochemical detection, and optics, chemistry, and biosensing.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and relates to a silver nanodisc, a preparation method thereof, a gold nanoring and an assembly prepared therefrom, in particular to a silver nanodisk, a preparation method thereof and a gold nanometer prepared therefrom rings and gold nanoring-based assemblies. Background technique [0002] With its unique high symmetry, noble metal nanorings exhibit special optical properties, which can be used in negative refractive index materials, waveguides, surface plasmon focusing, surface-enhanced Raman scattering, biosensors, nanoantennas, and nanolight manipulation. It has very important potential applications in other fields. Due to its large cavity volume and unique electric field distribution in the ring, noble metal nanorings have high sensitivity and large field enhancement effect, so they have attracted much attention in the field of sensors and have great potential. Value. Metal ring na...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/24B82Y30/00B82Y40/00G01N21/65
CPCG01N21/658B82Y30/00B82Y40/00B22F9/24B22F1/0549B22F1/0551B22F1/054
Inventor 李娜丁宝全尚颖旭湛鹏飞李彤彤
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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