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Silver nanorod/ polymer/ silver nanosheet core-shell nanometer material and preparation method and application thereof

A technology of core-shell nanomaterials and silver nanorods, which is applied in the field of materials engineering and nanometers, can solve the problems of weak SERS signal, inability to use single-molecule detection, efficiency and reliability of SERS nanoprobes, dissociation or exchange damage, etc., to achieve High SERS signal strength and good electromagnetic coupling effect

Active Publication Date: 2017-10-24
东营睿港投资服务有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the SERS signal of silver nanoparticles alone is usually too weak to be used for single-molecule detection due to the lack of nanogap in them.
Meanwhile, the efficiency and reliability of SERS nanoprobes are often compromised by ligand dissociation or exchange

Method used

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  • Silver nanorod/ polymer/ silver nanosheet core-shell nanometer material and preparation method and application thereof
  • Silver nanorod/ polymer/ silver nanosheet core-shell nanometer material and preparation method and application thereof
  • Silver nanorod/ polymer/ silver nanosheet core-shell nanometer material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation method of silver nanorod / polymer / silver nanosheet core-shell nanomaterial comprises the following steps:

[0042] 1. Dissolve 0.5 mg of chloroauric acid, 0.735 mg of sodium citrate and 0.0567 mg of sodium borohydride in 9.65 ml of deionized water, mix and stir for 10 minutes and then stand for 2 hours to obtain an aqueous solution of gold seeds; 2.92 grams of CTAB (hexadecane trimethylammonium bromide), 16 mg of chloroauric acid, 1.36 mg of silver nitrate, 11.26 mg of ascorbic acid, 1.33 ml of hydrochloric acid and 0.4 ml of the above gold seed solution were mixed in 85 ml of deionized water for 1 minute and then centrifuged for 12 hours Obtain gold nano-bipyramids; dissolve all the above-mentioned gold nano-bipyramids, 6.14 grams of CTAC (cetyltrimethylammonium chloride), 81.6 milligrams of silver nitrate and 422.4 milligrams of ascorbic acid in 400 milliliters of deionized water and mix and stir After uniformity, heat and react at 60°C for 4 hours and ...

Embodiment 2

[0051] The preparation method of silver nanorod / polymer / silver nanosheet core-shell nanomaterial comprises the following steps:

[0052] 1. Mix 1 mg of chloroauric acid, 1.47 mg of sodium citrate and 0.1134 mg of sodium borohydride in 19.3 ml of deionized water and stir for 10 minutes to obtain the gold seed aqueous solution; mix 5.84 g of CTAB and 32 mg of chloroauric acid , 2.72 milligrams of silver nitrate, 22.52 milligrams of ascorbic acid, 2.66 milliliters of hydrochloric acid and 0.8 milliliters of the above-mentioned gold seed solution in 170 milliliters of deionized water, mixed and stirred for 1 minute and then left still for 12 hours to obtain gold nano-bicones; Nano biconical, 12.28g of CTAC, 163.2mg of silver nitrate and 844.8mg of ascorbic acid were dissolved in 800ml of deionized water, mixed and stirred evenly, heated and reacted at 60°C for 4 hours, and the precipitate was collected by centrifugation to obtain silver nanorods;

[0053] 2. Get all the silver nan...

Embodiment 3

[0060] The preparation method of silver nanorod / polymer / silver nanosheet core-shell nanomaterial comprises the following steps:

[0061] 1. Mix 1.5 mg of chloroauric acid, 2.205 mg of sodium citrate and 0.1701 mg of sodium borohydride in 28.95 ml of deionized water, mix and stir for 10 minutes and then let it stand for 2 hours to obtain an aqueous solution of gold seeds; mix 8.76 grams of CTAB and 48 mg of gold chloride acid, 4.08 milligrams of silver nitrate, 33.78 milligrams of ascorbic acid, 3.99 milliliters of hydrochloric acid and 1.2 milliliters of the above-mentioned gold seed solution were mixed and stirred in 255 milliliters of deionized water for 1 minute and then left still for 12 hours to obtain the gold nano-bicones; Nano biconical, 18.42g of CTAC, 244.8mg of silver nitrate and 1267.2mg of ascorbic acid were dissolved in 1200ml of deionized water, mixed and stirred evenly, heated at 60°C for 4 hours and centrifuged to collect the precipitate to obtain silver nanoro...

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Abstract

The invention discloses a silver nanorod / polymer / silver nanosheet core-shell nanometer material and a preparation method and application of the silver nanorod / polymer / silver nanosheet core-shell nanometer material. The silver nanorod / polymer / silver nanosheet core-shell nanometer material is characterized in that the core-shell nanometer material is composed of the three portions of a silver nanorod core, a polymer cladding layer and a silver nanosheet outer layer, the polymer cladding layer is polystyrene-polyacrylic acid segmented copolymer layer with the thickness being 10 nanometers; the length of the silver nanorod core is from 400 nanometers to 1.3 microns, and the silver nanosheet outer layer is irregular sheets with the edge length being 120-320 nanometers correspondingly; or the length of the silver nanorod core is 175-310 nanometers, and the silver nanosheet outer layer is in a bolt shape with the bottom edge length being 510-780 nanometers correspondingly and covers half of the silver nanorod core. The silver nanorod / polymer / silver nanosheet core-shell nanometer material is prepared through a seed inducement method. The silver nanorod / polymer / silver nanosheet core-shell nanometer material and the preparation method and application of the silver nanorod / polymer / silver nanosheet core-shell nanometer material have the advantages that SERS signal output quite high in intensity is generated, the preparation technology is simple, the preparation period is short, the yield is high, and popularization and mass production are easy.

Description

technical field [0001] The invention relates to the fields of material engineering and nanotechnology, in particular to a silver nanorod / polymer / silver nanosheet core-shell nanomaterial and its preparation method and application. Background technique [0002] Over the past two decades, surface-enhanced Raman scattering (SERS) technology has developed into an efficient analytical detection method in the fields of life healthcare, environmental monitoring, and food safety due to its single-molecule-level sensitivity. Among various SERS materials, the advantage of noble metal nanomaterials is that their surface plasmon resonance (LSPR) can induce extremely strong localized electromagnetic fields and exhibit excellent enhancement properties. Among these noble metal nanomaterials, silver stands out for its good reinforcement properties and simple preparation process. By using various types of surfactants, people have prepared a variety of silver nanomaterials, such as nanorods, ...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F9/24B82Y40/00G01N21/65
CPCG01N21/658B82Y40/00B22F9/24B22F1/07B22F1/17
Inventor 姜涛
Owner 东营睿港投资服务有限责任公司
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