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Gold nanorod-silicon dioxide core-shell structure nanometer material, preparation method and application

A gold nanorod, silicon dioxide technology, applied in the field of nanomaterials, can solve the problems of poor assembly structure stability, unable to maintain optical activity, affecting applications, etc., and achieve the effects of low cost, improved circular dichroism optical activity, and diverse properties.

Active Publication Date: 2015-11-11
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Application Information

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Problems solved by technology

However, this chiral gold nanorod assembly is produced in solution, and its assembly structure is poorly stable and easily precipitated, resulting in the inability to maintain optical activity over time, which greatly affects its application in practical detection.

Method used

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  • Gold nanorod-silicon dioxide core-shell structure nanometer material, preparation method and application
  • Gold nanorod-silicon dioxide core-shell structure nanometer material, preparation method and application
  • Gold nanorod-silicon dioxide core-shell structure nanometer material, preparation method and application

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Embodiment

[0055] A chiral gold nanorod assembly silica core-shell structure nanomaterial, prepared by the following method:

[0056] (1) Preparation of gold nanorods by seed growth method:

[0057] ① Synthesis of seed crystals: 0.15mL of 10mmol / L NaBH 4 The solution was quickly added to 10mL containing 0.25mmol / L sodium citrate and 0.125mmol / LHAuCl 4 In the mixed solution, after stirring for 2 minutes, put it in a constant temperature water bath at 23°C to stand still, and set it aside after 2 hours;

[0058] ② Generation of gold nanorods: add 0.1mol / LCTAB, 0.5mmol / LHAuCl to 10mL 4 , 0.055mmol / L ascorbic acid and 0.06mmol / L silver nitrate mixed solution, add 12 μ L step (1) synthetic seed crystal, after standing for 12h, concentrate to 1nmol / L after purification, add hexadecyl trimethyl bromide ammonium chloride to obtain the gold nanorod solution for subsequent use; the concentration of cetyltrimethylammonium bromide in the gold nanorod solution is denoted as C CTAB ;

[0059] The...

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Abstract

The invention discloses a gold nanorod-silicon dioxide core-shell structure nanometer material. The core structure of the core-shell structure nanometer material is a chiral gold nanorod side-by-side assembly with the circular dichroism optical activity. The shell structure of the core-shell structure nanometer material is silicon dioxide. The core of the chiral gold nanorod side-by-side assembly is coated with the silicon dioxide shell layer, so that the nanometer material with the circular dichroism optical activity is obtained. According to the nanometer material, the side-by-side assembly structure is stable, the solution state is stable, and the circular dichroism optical activity is obviously improved, wherein the circular dichroism optical activity is improved by 4-6 times compared with a pure chiral gold nanorod, and the stability is kept as long as 6 months. A preparation method of the gold nanorod-silicon dioxide core-shell structure nanometer material is simple and low in cost. The obtained chiral gold nanorod side-by-side assembly-silicon dioxide core-shell structure nanometer material has various compositions and properties, is wide in application range and has the large development space.

Description

technical field [0001] The invention belongs to the field of nanomaterials, and relates to a gold nanorod-silica core-shell structure nanomaterial, a preparation method and an application thereof, in particular to a chiral gold nanorod assembly silica core-shell structure nanomaterial and its preparation According to the method, the chiral core-shell nanomaterial has circular dichroism optical activity and good stability. Background technique [0002] Due to the unique phenomenon of surface plasmon resonance, noble metal nanoparticles have a wide range of applications in the fields of biological imaging, photonic devices, chemical sensing and biological therapy. [0003] The researchers found that chiral molecules can induce noble metal nanoparticles to be optically active in the visible region when attached to the surface of gold nanorods (Govorov, A.O.; Fan, Z.Y.; Hernandez, P.; Slocik, J.M.; Naik, R.R. Theory of Circular Dichroism of Nanomaterials Comprising Chiral Molec...

Claims

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Application Information

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IPC IPC(8): B82B1/00B82B3/00B82Y30/00B82Y40/00G01N21/55
Inventor 唐智勇韩冰
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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