Preparation method and obtained product of self-assembled composite nanostructure of side-by-side gold nanorods coated with polydopamine

A technology of composite nanostructures and gold nanorods, which is applied in the fields of nanotechnology, nanotechnology, and nanotechnology for materials and surface science, and can solve the problems of limited use of gold nanorods, difficult control of assembly forms, and cumbersome steps.

Active Publication Date: 2021-06-15
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current methods for self-assembly and coating of gold nanorods have the disadvantages of cumbersome steps, complex reagents, and difficult control of the assembly form, which limits the use of gold nanorods.

Method used

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  • Preparation method and obtained product of self-assembled composite nanostructure of side-by-side gold nanorods coated with polydopamine
  • Preparation method and obtained product of self-assembled composite nanostructure of side-by-side gold nanorods coated with polydopamine
  • Preparation method and obtained product of self-assembled composite nanostructure of side-by-side gold nanorods coated with polydopamine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1.1 Preparation and pretreatment of gold nanorods: The classic seed growth method was used to prepare gold nanorods, the resulting reaction solution was centrifuged at 10,000 rpm for 20 minutes, the supernatant was removed, the precipitate was washed with water, and then centrifuged to remove The supernatant was then added to the centrifuge to wash once to obtain gold nanorods with a diameter of 12 nm and an aspect ratio of 4.5:1, and then disperse the gold nanorods into an appropriate amount of water to form a concentrated high-concentration gold nanorod solution ( The absorbance of ten-fold dilution is 1.0, and the absorption peak is at 815nm), and set aside.

[0033] 1.2 The formation process of "side by side" self-assembly: Take 2 mL of the gold nanorod solution described in step 1), add 3 mL of water, 30 microliters of polyacrylic acid PAA solution (0.2 mg / mL) and 45 microliters of ammonia water (2mol / L), ultrasonically mixed for 1 hour, and then 55 mL of isopropa...

Embodiment 2

[0039] 2.1 Preparation and pretreatment of gold nanorods: same as in Example 1.

[0040] 2.2 The formation process of "side by side" self-assembly: take 4 mL of the gold nanorod solution described in step 1), add 6 mL of water, 60 microliters of polyacrylic acid PAA (0.2 mg / mL) and 90 microliters of ammonia water (2 mol / L), the pH of the solution was 7.5, ultrasonically mixed for 1 hour, and then 110 mL of isopropanol solution (water:isopropanol volume ratio 1:10) was added dropwise, the color of the solution turned blue, and self-assembly occurred.

[0041] 2.3 Take 60 mL of the solution prepared in step 2), mix it with 20 mL of isopropanol / water solvent (volume ratio 1:1), sonicate for 20 minutes, add ammonia water (2 mol / L) to adjust the pH of the solution to 8.5, and then add 80 microliters of dopamine aqueous solution with a concentration of 0.05 g / mL was reacted at 50 °C for 4 hours to obtain a dark brown solution, which was centrifuged and washed to obtain polydopamine...

Embodiment 3

[0044] 3.1 Preparation and pretreatment of gold nanorods: same as in Example 1.

[0045] 3.2 Formation process of "side by side" self-assembly: Take 2 mL of the gold nanorod solution described in step 1), add 50 microliters (0.2 mg / mL) of polyacrylic acid PAA and 90 microliters of ammonia water (2 mol / L) , the solution pH to 7.5, ultrasonically mixed for 1 hour, 110 mL of isopropanol solution (water: isopropanol volume ratio 1:10) was added dropwise, the color of the solution turned blue, and self-assembly occurred.

[0046] 2.3 Take 60 mL of the solution prepared in step 2), mix it with 20 mL of isopropanol / water (volume ratio 1:1) solvent, sonicate for 20 minutes, add ammonia water (2 mol / L) to adjust the pH of the solution to 8.5, and then Add 80 microliters of dopamine aqueous solution with a concentration of 0.05 g / mL and react at 45 °C for 5 hours to obtain a dark brown solution. After centrifugation and washing, polydopamine-coated side-by-side gold nanorod self-assembl...

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Abstract

The present invention relates to a preparation method of side-by-side self-assembled composite nanostructure of polydopamine-coated gold nanorods and the resulting product. The method uses isopropanol and polyacrylic acid to induce side-by-side self-assembly of gold nanorods, and then uses polydopamine to coat A gold nanorod self-assembly structure, the obtained gold nanorods are ordered and assembled along the axial direction to form a side-by-side self-assembly structure of gold nanorods. The invention has simple operation, good repeatability, and low cost, and the self-assembled composite nanostructure of side-by-side gold nanorods coated with polydopamine has good plasmon resonance optical properties, and exhibits good photothermal effect and surface-enhanced Raman scattering effect, good photothermal conversion efficiency, good heat resistance, and has good application prospects in the field of nano-photothermal diagnostic agents and optical sensing.

Description

technical field [0001] The invention relates to a method for preparing a nanocomposite structure with polydopamine as the shell and a gold nanorod self-assembled structure as the core and the resulting product, in particular to a polydopamine-coated side by side ordered The invention relates to a method for preparing a self-assembled composite nanostructure of arranged gold nanorods and a product thereof, belonging to the field of functional nanomaterials. Background technique [0002] In recent years, due to their unique tunable optical properties and geometric structure, gold nanorods have potential application value in the field of optical sensing, and have attracted extensive attention from many researchers. Gold nanorods have continuously adjustable surface plasmon resonance absorption peaks from the visible to the near-infrared region with the change of aspect ratio, extremely high surface electric field strength enhancement effect, great optical absorption, scattering...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F1/00B82Y40/00B82Y30/00
CPCB82Y40/00B82Y30/00B22F1/07B22F1/102
Inventor 陈玲李梦霞张晓喻杨萍
Owner UNIV OF JINAN
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