Preparing method and application of self-assembly structures of gold and silver core-shell particles and gold nanometer rods

A gold-silver core-shell and gold nanorod technology, applied in the field of analytical chemistry, can solve problems such as inability to ensure accurate analysis, and achieve accurate quantitative results

Active Publication Date: 2016-11-16
JIANGNAN UNIV
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  • Abstract
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Problems solved by technology

Although these quantitative detection methods have certain sensitivity and specificity, they are all single-modal response signals, which cannot ensure accurate analysis

Method used

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  • Preparing method and application of self-assembly structures of gold and silver core-shell particles and gold nanometer rods
  • Preparing method and application of self-assembly structures of gold and silver core-shell particles and gold nanometer rods
  • Preparing method and application of self-assembly structures of gold and silver core-shell particles and gold nanometer rods

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Embodiment 1

[0024] All glass instruments were soaked in aqua regia for 24h, washed with double distilled water, and dried for later use. The water used in the experiment was 18.2 MΩ Milli-Q ultrapure water.

[0025] (1) Synthesis of gold nanoparticles: Take 97.5mL of ultrapure water in a clean round bottom flask, add 2.5mL of 4g / L chloroauric acid solution, stir and mix with constant temperature magnetic force and heat to boiling, and keep boiling for 5 After -6 min, quickly add 2.0 mL of 1% trisodium citrate solution to the above mixed solution, and continue heating and stirring for 10 min until the solution is stable and translucent wine red. Finally, the reaction solution was cooled to room temperature and stored at 4 °C for future use, and gold nanoparticles with a particle size of about 18 nm were prepared.

[0026] (2) Synthesis of gold-silver core-shell particles: first, pre-synthesized 100 μL gold nanoparticles were centrifuged and resuspended in 5 mM phosphate buffer solution co...

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Abstract

The invention provides a preparing method and an application of self-assembly structures of gold and silver core-shell particles and gold nanometer rods and belongs to the field of analytic chemistry. The preparing method comprises the synthesis of the gold and silver core-shell nanometer particles, the synthesis of the gold nanometer rods, the nucleic acid modification of the gold and silver core-shell nanometer particles, the fluorochrome and aptamer modification of the gold nanometer rods, the self-assembly of dimers of the gold and silver core-shell particles and the gold nanometer rods, Raman beacon modification and the bimodal quantitative detection of dopamine. The self-assembly structures integrate SERS (surface-enhanced Raman scattering) with fluorescence signals, and the dimers of the gold and silver core-shell particles and the gold nanometer rods, combining the SERS and fluorescence signals are formed. With the variation of distances between the gold nanometer rods and the gold and silver core-shell particles and the regulation of the surface plasma resonance properties of the assembly structures, the dopamine can be accurately quantified by monitoring the variation of the strength of the SERS and fluorescence signals.

Description

technical field [0001] The invention relates to a preparation method and application of a gold-silver core-shell particle-gold nanorod self-assembly structure, belonging to the field of analytical chemistry. Background technique [0002] Since the birth of nanomaterials, due to their excellent quantum size effect, surface effect, and quantum tunneling effect, they have attracted extensive attention from many scientists and researchers, and have had a profound impact on various fields of science and society. Based on the synergistic effect of assembly primitives, the assembly of nanomaterials not only has the characteristics of nanoparticles, but also produces new coupling effects, showing unique optical, electrical and magnetic properties, and has become an important component of analytical chemistry, optical devices, It is an ideal material in many fields such as catalysis, chemical industry, environment and medicine. Dopamine (DA) is an important neurotransmitter, and cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F1/145
Inventor 吴晓玲匡华徐丽广胥传来刘丽强宋珊珊
Owner JIANGNAN UNIV
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