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Gold nano structure with cone-shaped surface and preparation method and application thereof

A gold nanostructure and gold nanoparticle technology is applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science. Weak force and other problems, to achieve the effect of stable structure, scientific preparation method, high SERS activity

Active Publication Date: 2019-05-07
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present technology allows for efficient use of specific compounds called Rhodiamin (Rhodamin)6 G and METHYLP), which have unique properties that make them useful as chemical sensors. These techniques allow researchers to detect small amounts of these substances easily without being affected by changes caused during manufacturing processes such as temperature variations or humidity fluctuations. This makes this process more cost-effective than current methods like liquid chromatography. Additionally, they provide high levels of stability when combined together into larger structures, making their applications possible even beyond traditional analysis tools.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the performance of metal nanospheres used in surface enhancement raman scatterers due to their ability to create strong electric fields that improve signal intensity without being easily destroyed during use.

Method used

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  • Gold nano structure with cone-shaped surface and preparation method and application thereof
  • Gold nano structure with cone-shaped surface and preparation method and application thereof
  • Gold nano structure with cone-shaped surface and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The concrete steps of preparation are:

[0044] Step 1, first according to the weight ratio of chloroauric acid powder, polyvinylpyrrolidone powder, citric acid powder and water is 0.04:1.2:0.0005:55, the chloroauric acid powder, polyvinylpyrrolidone powder and citric acid powder are dissolved in water to obtain a mixture. Then the mixed solution was heated to 35° C. and kept for 6 hours to obtain an electrolyte solution.

[0045] In step 2, an 18nm-thick gold film is sputtered on the conductive substrate; wherein, the conductive substrate is a single crystal silicon wafer conductive substrate. Then, the conductive substrate covered with gold film was used as the cathode, and the graphite sheet was used as the anode, and they were placed together in the electrolyte solution at 35°C, and the current density was 60μA / cm 2 Electrodeposited at a constant current for 9h to obtain a conductive substrate covered with pointed cone-shaped particles.

[0046]In step 3, the ele...

Embodiment 2

[0048] The concrete steps of preparation are:

[0049] Step 1, first according to the weight ratio of chloroauric acid powder, polyvinylpyrrolidone powder, citric acid powder and water is 0.045:1.1:0.00075:53, the chloroauric acid powder, polyvinylpyrrolidone powder and citric acid powder are dissolved in water to obtain a mixture. Then, the mixed solution was heated to 39° C. and kept for 5.2 hours to obtain an electrolyte solution.

[0050] In step 2, a gold film with a thickness of 19 nm is sputtered on the conductive substrate; wherein, the conductive substrate is a single crystal silicon wafer conductive substrate. Then, the conductive substrate covered with gold film was used as the cathode, and the graphite sheet was used as the anode, and they were placed together in the electrolyte solution at 39°C, and the current density was 75μA / cm 2 Electrodeposited at a constant current for 8h to obtain a conductive substrate covered with pointed cone-shaped particles.

[0051...

Embodiment 3

[0053] The concrete steps of preparation are:

[0054] Step 1, according to the weight ratio of chloroauric acid powder, polyvinylpyrrolidone powder, citric acid powder and water is 0.05:1:0.001:50, dissolve the chloroauric acid powder, polyvinylpyrrolidone powder and citric acid powder in water to obtain a mixture. Then the mixed solution was heated to 43° C. and kept for 4.5 hours to obtain an electrolyte solution.

[0055] Step 2, sputtering a 20nm-thick gold film on the conductive substrate; wherein, the conductive substrate is a single crystal silicon wafer conductive substrate. Then, the conductive substrate covered with gold film was used as the cathode, and the graphite sheet was used as the anode, and they were placed together in the electrolyte solution at 43°C, and the current density was 90μA / cm 2 Electrodeposited at a constant current for 7h to obtain a conductive substrate covered with pointed cone-shaped particles.

[0056] In step 3, the electrolyte solution...

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Abstract

The invention discloses a gold nano structure with a cone-shaped surface and a preparation method and application thereof. The structure is composed of a conductive substrate and gold nano particles on the conductive substrate, the gold nano particles are densely-distributed pointed cone-shaped particles which are densely packed with dense needle-shaped particles; the method comprises the following steps of dissolving chloroauric acid powder, polyvinylpyrrolidone powder and citric acid powder in water, heating to 35-50 DEG c and carrying out heat preservation to obtain an electrolyte, then a conductive substrate sputtered with a gold film with the thickness of 18 -22 nm is used as a cathode and the graphite flake is used as an anode to be placed in the electrolyte for electrodeposition toobtain the conductive substrate with pointed cone-shaped particles on the conductive substrate, then, heating the electrolyte to 55-65 DEG c and preserving heat, cooling to 35-50 DEG c, then taking the conductive substrate with pointed cone-shaped particles on the conductive substrate as a cathode and the graphite flake is used as an anode to be placed in an electrolyte for electrodeposition so asto prepare a target product. The method is very easy to be widely commercialized as an SERS active substrate, the rhodamine 6G or methyl parathion attached to the gold nano structure is measured by using a laser raman spectrometer.

Description

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Claims

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Application Information

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Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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