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A method for modulating the optical cross section of gold nanorods at a single wavelength

A gold nanorod, single-wavelength technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as difficult control, achieve high repetition rate, simple operation, and high yield Effect

Active Publication Date: 2020-12-01
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is relatively difficult to control the scattering and absorption cross sections of gold nanorods under the premise of keeping the wavelength constant.

Method used

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  • A method for modulating the optical cross section of gold nanorods at a single wavelength
  • A method for modulating the optical cross section of gold nanorods at a single wavelength
  • A method for modulating the optical cross section of gold nanorods at a single wavelength

Examples

Experimental program
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Effect test

Embodiment

[0058] (1), configure different concentrations of BSA solution:

[0059] A mixture solution was prepared by dissolving 5-bromosalicylic acid (0.44 g) in 100 mL of CTAB (0.05 M, 55° C.) to obtain a mixed solution of 20 mM BSA. Then dilute the mixture solution with CTAB (0.05M) solution to obtain a BSA solution with a concentration ranging from 0mM to 15mM (0mM, 0.2mM, 0.5mM, 1mM, 2mM, 5mM, 10mM, 15mM), and stand at 27°C 2 hours.

[0060] (2), the preparation of new seed crystal solution:

[0061] Freshly prepared NaBH with ice water 4 Aqueous solution (Sigma-Aldrich, 0.6mL, 0.01M) was added by HAuCl 4 ·3H 2 O (Sigma-Aldrich, 250 μL, 0.01M) and cetyltrimethylammonium bromide CTAB (TCI, 9.71mL, 0.1M) in a mixture solution. The solution was fully stirred for 2 minutes, and the obtained solution was left to stand at room temperature in the dark for 30 minutes to obtain an original seed crystal solution.

[0062] CTAB (3.6 g) and 5-bromosalicylic acid (0.44 g) were dissolved i...

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Abstract

The invention discloses a method for modulating a gold nanorod optical section on a single wavelength. The method for modulating the gold nanorod optical section on the single wavelength includes thefollowing steps that newly prepared AgNO<3> is added in a mixed liquid of CTAB and 5-bromine salicylic acid, and anti-light standing is conducted; a HAuCl<4>.3H<2>O solution is added, and uniform stirring is conducted; an ascorbic acid solution is added, stirring is conducted until the solution is colorless, and a growth liquid is obtained; the HAuCl<4>.3H<2>O solution is added in a mixed liquid of the CTAB and the 5-bromine salicylic acid, and stirring is conducted; the ascorbic acid solution is added, stirring is conducted until the solution is colorless, and a regrowth liquid is obtained; an original seed crystal solution and the growth liquid are mixed and stirred, and standing is conducted until the color of the solution turns into purple; centrifugation is conducted on the solution,gold nanorods are dispersed in the mixed liquid of the CTAB and the 5-bromine salicylic acid, and a new seed crystal solution is obtained; and the new seed crystal solution and the regrowth liquid aremixed, the volume of the regrowth liquid and the concentration of the 5-bromine salicylic acid are adjusted, then the gold nanorods with the same wavelengths and different optical sections can be obtained. According to the method for modulating the gold nanorod optical section on the single wavelength, the operation is simple, the repetitive rate is high, and scattering and absorbing sections ofthe gold nanorods can be modulated on any single wavelength.

Description

technical field [0001] The invention relates to the technical field of gold nanorods, in particular to a method for modulating the optical section of gold nanorods at a single wavelength. Background technique [0002] Scattering and absorption cross sections are physical quantities that quantitatively study the strength of the interaction between light and nanoparticles. There is a three-dimensional space area where the nanoparticle is located, and only photons passing through this specific area will be scattered and absorbed. One of the advantages of metal nanoparticles is that they have a relatively large equivalent scattering cross section and absorption cross section, and their extinction cross section is at least five orders of magnitude larger than that of traditional nanoparticles. [0003] Gold nanorods (AuNRs) possess the properties of transverse and longitudinal surface plasmon resonances, which correspond to electron oscillations perpendicular to and parallel to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B82Y40/00B82Y30/00
Inventor 倪卫海邹微微谢皓叶洋赵飞朱海飞
Owner SUZHOU UNIV
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