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A simple small-sized gold nanostar with adjustable branch length and its preparation method

A gold nano and nano technology, which is applied in the field of preparation and regulation of noble metal nanosystems, can solve the problems of great difficulty in regulating gold nanostars, achieve excellent photothermal conversion efficiency, good automation interface, and simple and easy experimental operation

Active Publication Date: 2017-10-31
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process emphasizes the use of a single wavelength of ultraviolet light to shorten the gold nanorods. However, although the gold nanorods can be regulated, it is very difficult to control the gold nanostars due to the large number of gold nanostar tips.

Method used

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  • A simple small-sized gold nanostar with adjustable branch length and its preparation method
  • A simple small-sized gold nanostar with adjustable branch length and its preparation method
  • A simple small-sized gold nanostar with adjustable branch length and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1) Preliminary preparation of reactants. Include the following steps:

[0049] 101) Prepare one 50mL and 10mL graduated cylinder, one 500mL beaker, two 50mL beakers, glass rod, jar, 50mL plastic centrifuge tube, 10mL stoppered graduated test tube, pipette gun, and plastic dropper. The glass container was ultrasonically cleaned with alcohol and ultrapure water in sequence.

[0050] 102) Prepare 50 mL of HEPES solution with a concentration of 100 mM, 20 mL of NaOH solution with a concentration of 1 M, and HAuCl with a concentration of 10 mM 4 Solution 10mL. Add 10mL of NaOH solution dropwise to the HEPES solution to adjust the pH to 7.4. HAuCl 4 Placed in a 10mL stoppered graduated test tube. Put the pH-adjusted HEPES in a jar.

[0051] 2) Utilize the "one-step growth method" to directly prepare gold nanostars, including the following steps:

[0052] 201) Measure 10 mL of HEPES solution into a 50 mL beaker, place it on a magnetic stirrer and stir continuously. Add ...

Embodiment 2

[0055] 1) Preliminary preparation of reactants. Include the following steps:

[0056] 101) Prepare one 50mL and 10mL graduated cylinder, one 500mL beaker, two 50mL beakers, glass rod, jar, 50mL plastic centrifuge tube, 10mL stoppered graduated test tube, pipette gun, and plastic dropper. The glass container was ultrasonically cleaned with alcohol and ultrapure water in sequence.

[0057] 102) Prepare 50 mL of HEPES solution with a concentration of 100 mM, 20 mL of NaOH solution with a concentration of 1 M, and HAuCl with a concentration of 10 mM 4 Solution 10mL. Add NaOH solution dropwise to the HEPES solution to adjust the pH to 7.4. HAuCl 4 Placed in a 10mL stoppered graduated test tube. Put the pH-adjusted HEPES in a jar.

[0058] 2) Preparation of gold nanostars by light irradiation. Include the following steps:

[0059] 201) Measure 9mL of HEPES solution into a 50mL beaker, place it on a magnetic stirrer under a xenon lamp, add a magnetic vibrator into the beaker, ...

Embodiment 3

[0062] 1) Preliminary preparation of reactants. Include the following steps:

[0063] 101) Prepare one 50mL and 10mL graduated cylinder, one 500mL beaker, two 50mL beakers, glass rod, jar, 50mL plastic centrifuge tube, 10mL stoppered graduated test tube, pipette gun, and plastic dropper. The glass container was ultrasonically cleaned with alcohol and ultrapure water in sequence.

[0064] 102) Prepare 50 mL of HEPES solution with a concentration of 100 mM, 20 mL of NaOH solution with a concentration of 1 M, and HAuCl with a concentration of 10 mM 4 Solution 10mL. Add NaOH solution dropwise to the HEPES solution to adjust the pH to 7.4. HAuCl 4 Placed in a 10mL stoppered graduated test tube. Put the pH-adjusted HEPES in a jar.

[0065] 2) Preparation of gold nanostars by light irradiation. Include the following steps:

[0066] 201) Measure 10 mL of HEPES solution into a 50 mL beaker, place it on a magnetic stirrer under a xenon lamp, add a magnetic vibrator into the beake...

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Abstract

The invention belongs to the field of preparation and regulation of noble metal nanosystems, and relates to a simple small-sized gold nano-star with adjustable branch length and a preparation method thereof. The invention prepares the gold nanostar by a one-step growth method and adds light irradiation during the preparation process, thereby obtaining the small-sized gold nanostar and realizing the controllable length of the branches of the gold nanostar. The preparation method utilizes the commonly used biological buffer reagent——HEPES, as the reducing agent, stabilizer and shape inducer of the system, and directly adds a certain amount of chloroauric acid (HAuCl4) after adjusting the pH value of the system to 7.0-7.5, And adding different wavelengths of light irradiation, after a period of time, small-sized gold nanostars with different branch lengths can be formed. The method is simple, efficient, and environmentally friendly, and small-sized gold nanostars with different branch lengths and good stability and dispersion are obtained.

Description

technical field [0001] The invention belongs to the field of preparation and regulation of noble metal nanosystems, and relates to a simple small-sized gold nano-star with adjustable branch length and a preparation method thereof. Background technique [0002] Gold nanostar (gold nanostar) is a kind of multi-branched nanoparticles with tip structure. Due to the irregular tip structure and large specific surface area of ​​gold nanostars, it has remarkable scattering ability. At the same time, gold nanostars have a large molar extinction coefficient, and the incident electromagnetic radiation can easily penetrate the tip structure of gold nanostars, so that gold nanostars have excellent photothermal conversion efficiency. Gold nanostars have very excellent surface-enhanced Raman scattering (Surface-Enhanced Raman Scattering, SERS) effect, so they are ideal materials for assembling SERS substrates. [0003] At present, the most commonly used methods for preparing gold nanosta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B82Y40/00
CPCB82Y40/00B22F9/24B22F2999/00B22F1/0553B22F1/054B22F2202/11
Inventor 赵艳史娜娜郭孟扬蒋毅坚
Owner BEIJING UNIV OF TECH
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