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A kind of silver-coated gold nanorod side-by-side chiral oligomer and its preparation method and application

A gold nanorod, oligomer technology, applied in nanotechnology, nanotechnology, nanotechnology for sensing, etc., can solve problems such as high cost and complex preparation methods

Active Publication Date: 2019-07-02
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

However, the dimer of silver-coated gold nanorods needs to modify the gold nanorods with DNA sequences with sulfhydryl groups to assemble them into dimers. The preparation method is complicated and the cost is high, and the obtained silver-coated gold nanorods dimer The chiral signal of the body can only be regulated by the thickness of the silver shell

Method used

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  • A kind of silver-coated gold nanorod side-by-side chiral oligomer and its preparation method and application
  • A kind of silver-coated gold nanorod side-by-side chiral oligomer and its preparation method and application
  • A kind of silver-coated gold nanorod side-by-side chiral oligomer and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A silver-coated gold nanorod side-by-side chiral oligomer comprises 2-5 silver-coated gold nanorods arranged in parallel, and cysteine ​​is bonded on the surface of the silver-coated gold nanorod.

[0065] The preparation method of the above-mentioned silver-coated gold nanorod side-by-side chiral oligomer is as follows:

[0066] (1) Incubate the mixed solution of gold nanorods and CTAB at 30°C for 40min, then add silver nitrate and ascorbic acid, react at a pH of 10 and a temperature of 30°C for 60min, and centrifuge to obtain silver-coated gold nanorods ;

[0067] Wherein, the concentration of gold nanorods is 0.1nM, the concentration of CTAB is 33mM, the molar ratio of silver nitrate and gold atoms in gold nanorods is 0.3:1, and the molar ratio of ascorbic acid and silver nitrate is 10:1;

[0068] (2) Mix the silver-coated gold nanorods with the CTAB solution, incubate at 30°C for 30 minutes, then add sodium citrate, and react at 70°C for 10 minutes to obtain a silv...

Embodiment 2

[0087] A silver-coated gold nanorod side-by-side chiral oligomer comprises 2-5 silver-coated gold nanorods arranged in parallel, and cysteine ​​is bonded on the surface of the silver-coated gold nanorod.

[0088] The preparation method of the above-mentioned silver-coated gold nanorod side-by-side chiral oligomer is as follows:

[0089] (1) Incubate the mixed solution of gold nanorods and CTAB at 30°C for 30min, then add silver nitrate and ascorbic acid, react at a pH of 11 and a temperature of 30°C for 30min, and centrifuge to obtain silver-coated gold nanorods ;

[0090] Wherein, the concentration of gold nanorods is 0.05nM, the concentration of CTAB is 20mM, the molar ratio of silver nitrate and gold atoms in gold nanorods is 0.1:1, and the molar ratio of ascorbic acid and silver nitrate is 12:1;

[0091] (2) Mix the silver-coated gold nanorods with the CTAB solution, incubate at 30°C for 30 minutes, then add sodium citrate, and react at 80°C for 7 minutes to obtain a silv...

Embodiment 3

[0098] A silver-coated gold nanorod side-by-side chiral oligomer comprises 2-5 silver-coated gold nanorods arranged in parallel, and cysteine ​​is bonded on the surface of the silver-coated gold nanorod.

[0099] The preparation method of the above-mentioned silver-coated gold nanorod side-by-side chiral oligomer is as follows:

[0100] (1) Incubate the mixed solution of gold nanorods and CTAB at 30°C for 50 minutes, then add silver nitrate and ascorbic acid, react for 90 minutes at a pH of 7 and a temperature of 30°C, and centrifuge to obtain silver-coated gold nanorods ;

[0101] Wherein, the concentration of gold nanorods is 0.2nM, the concentration of CTAB is 33mM, the molar ratio of silver nitrate and gold atoms in gold nanorods is 1:1, and the molar ratio of ascorbic acid and silver nitrate is 5:1;

[0102] (2) Mix the silver-coated gold nanorods with the CTAB solution, incubate at 30°C for 30 minutes, then add sodium citrate, and react at 70°C for 5 minutes to obtain a...

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Abstract

The invention provides a silver-plated gold nanorod side-by-side chiral oligomer and a preparation method and purposes thereof. The silver-plated gold nanorod side-by-side chiral oligomer comprises aplurality of parallel silver-plated gold nanorods; and cysteine is bonded to the surfaces of the silver-plated gold nanorods. The preparation method comprises the following steps that firstly, silvergrows on the surfaces of gold nanorods so as to form the silver-plated gold nanorods; secondly, a silver-plated gold nanorod side-by-side oligomer is formed under an electrostatic adsorption effect; and thirdly, the cysteine is added for reaction, and the silver-plated gold nanorod side-by-side chiral oligomer is formed. The silver-plated gold nanorod side-by-side chiral oligomer provided by the invention has a plasmonic circular dichroism (PCD) response and temperature and pH dependence, and can be used for the field of temperature and / or pH sensing.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a side-by-side chiral oligomer of silver-coated gold nanorods and a preparation method and application thereof. Background technique [0002] Plasmonic circular dichroism (PCD) is a novel circular dichroism induced at the localized surface plasmon resonance (LSPR) of plasmonic nanoparticles. two-color signal. The LSPR response of metal nanoparticles is very sensitive to particle shape, size, composition, structure, and the dielectric constant of the surrounding environment, so it is easy to achieve LSPR peak position (such as from visible to near-infrared spectral region) and intensity by adjusting these parameters. regulation. This feature makes the plasmonic circular dichroism signal of nanoparticles have very broad application prospects in chiral sensing, biological imaging, and negative refractive index materials. [0003] The construction of plasmonic ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F1/00G01D21/02B82Y40/00B82Y15/00
Inventor 陈远东孟德静吴晓春
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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