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Method for establishing nano particle small polymers by using indoles dyestuff

A nanoparticle and indole technology, applied in the directions of organic dyes, chemical instruments and methods, methine-based/polymethine-based dyes, etc., can solve the problem of lack of research on the formation distance, and achieve simple method, good dispersibility, and enhanced substrate. high effect

Inactive Publication Date: 2017-05-10
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many researchers have conducted a lot of research on the controllable synthesis of nanomaterials, there is still little research on how to realize the orderly and controllable synthesis of small nanoparticle aggregates.
[0003] There have been many reports on the use of Raman-active dyes as markers on the surface of nanoparticles, but with the help of indole dyes to form a "π-πstacking effect" between nanoparticles, there will be dye molecules between two adjacent nanoparticles. There is no research on the formation of dimerization, trimerization, and other small aggregates of ordered nanoparticles with controlled distances.

Method used

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  • Method for establishing nano particle small polymers by using indoles dyestuff
  • Method for establishing nano particle small polymers by using indoles dyestuff
  • Method for establishing nano particle small polymers by using indoles dyestuff

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Operation and characterization of indole dyes to construct nanoparticle aggregates:

[0025] (1) Preparation of 12nm gold sol:

[0026] Mass fraction is 1% chloroauric acid aqueous solution (1.7mL) is added into 50mL water and heated to 100 degrees (keep stirring), then quickly add mass fraction is 1% sodium citrate solution (5mL) as reducing agent, react for 15 minutes , and finally a 12-size nano-gold sol was obtained.

[0027] (2) Surface plasmon characteristics of 12nm gold particles

[0028] figure 1 It is the UV-Vis spectrogram of 12nm gold particles, and it can be clearly observed that the maximum absorption wavelength (λ max ) at 517 nm, this size corresponds to the 12 nm particle size reported in the literature.

[0029] (3) Indole dyes are assembled onto nanoparticles:

[0030] The indole dye solution is added to the nano-sol so that the concentrations of the two are 0.084 micromole and 2.5 nanomole respectively, so that the dye molecules on the surface o...

Embodiment 2

[0034] Operation and characterization of indole dyes to construct nanoparticle aggregates:

[0035] (1) Preparation of 30nm gold sol:

[0036] Mass fraction is 1% chloroauric acid aqueous solution (1.7mL) is added into 50mL water and heated to 100 degrees (keep stirring), then quickly add mass fraction is 1% sodium citrate solution (5mL) as reducing agent, react for 15 minutes , 0.5 mL of Au seeds were mixed with 0.5 mL of chloroauric acid aqueous solution (1%) at room temperature according to the particle size, and then 2.1 mL of NH 2 OH·HCl solution (40mM) was used as a reducing agent to finally obtain a 30-size nano-gold sol.

[0037] (2) Surface plasmon characteristics of 30nm gold particles

[0038] image 3 It is the UV-Vis spectrogram of 30 nanometer gold particles, and it can be clearly observed that the maximum absorption wavelength (λ max ) at 521 nm, this size corresponds to the particle size of 30 nm reported in the literature.

[0039] (3) Indole dyes are ass...

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Abstract

The invention discloses a method for establishing nano particle small polymers by using indoles dyestuff. According to the method, an ionic agent with negative charge is assembled on the surfaces of nano particles with certain sizes, and then is combined to indoles dyestuff molecules with positive charge with the aid of effect of static electricity between the negative charge and the positive charge to obtain small polymers such as dipolymers and tripolymers of the ordered nano particles. By an ultraviolet spectrum, a spectral quality changing process of gold particles from mutually independent individuals into the small polymers can be observed, and the dynamic process of formation of the gold particle small polymers is tracked. The nano structures can be used as enhanced bases which are applied to a surface-enhanced Raman spectroscopy technology for a trace amount of sensitive detection.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial synthesis, and in particular relates to a method for constructing nanoparticle small aggregates by using indole dyes. Background technique [0002] The phenomenon that nanoparticles are easy to agglomerate in aqueous solution (conventional agglomerates are a combination of multiple nanoparticles that are disordered for some reason) has always been a problem in the field of nanoparticle applications, but some small nanoparticle aggregates (such as Silver, gold, copper, etc.) can be used as a substrate with a greatly enhanced signal in surface-enhanced Raman spectroscopy applications. When some Raman active molecules are adsorbed on specially treated metal surfaces (such as silver, gold, copper, etc.), they Raman scattering will be enhanced by ~10 4 -10 6 times, and even up to 10 times in the orderly aggregated nanostructure system 8 -10 14 enhancement factor. Although many researchers hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B23/08
CPCC09B23/08
Inventor 成汉文朱丽莹陈浩天罗谨
Owner SHANGHAI INST OF TECH
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