Nanogold Colloid for responding heavy metal ion and method for making same

A technology of gold nano sol and heavy metal ions, which is applied in the field of gold nano materials, can solve the problems of insufficient stability of gold nanoparticles and insufficient sensitivity of heavy metal response, and achieve the effects of low manufacturing cost, long shelf life and simple process

Inactive Publication Date: 2009-06-17
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The purpose of the present invention is to overcome the insufficient stability of existing gold nanoparticles and the insufficient sensitivity to heavy metals, and to provide a stable gold nanosol that is sensitive to heavy metal ions.

Method used

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  • Nanogold Colloid for responding heavy metal ion and method for making same
  • Nanogold Colloid for responding heavy metal ion and method for making same
  • Nanogold Colloid for responding heavy metal ion and method for making same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Use ultrapure water to make chloroauric acid into an aqueous solution with a concentration of 0.53mmol / L, then add 0°C methanol to the chloroauric acid aqueous solution, the volume ratio of chloroauric acid aqueous solution to methanol is 1:1, and ultrasonically Shock.

[0054] (2) Add a concentration of 0.002g / ml L-cysteine ​​aqueous solution to the chloroauric acid solution obtained in step 1, so that the molar ratio of L-cysteine ​​to chloroauric acid is 1:3, and ultrasonically vibrate well mixed.

[0055] (3) Add dropwise a methanol solution of sodium borohydride with a concentration of 0.002g / ml to the mixed solution obtained in step 2, the molar ratio of sodium borohydride to chloroauric acid is 8:1, and the S / Au obtained by ultrasonic vibration is 1 :3 gold nano-sol.

[0056] Transmission electron microscopy confirmed that the average particle size of the nanoparticles was 5nm.

Embodiment 2

[0058] The preparation method of gold nano sol is as follows:

[0059] (1) Use deionized water to make chloroauric acid into an aqueous solution with a concentration of 0.86mmol / L, then add methanol at -5°C to the chloroauric acid aqueous solution, and the volume ratio of chloroauric acid aqueous solution to methanol is 1:1.2, Ultrasound.

[0060] (2) Add an aqueous L-cysteine ​​solution with a concentration of 0.0018g / ml to the chloroauric acid solution obtained in step 1, so that the molar ratio of L-cysteine ​​to chloroauric acid is 1:2, and ultrasonically vibrate well mixed.

[0061] (3) Add dropwise a methanol solution of sodium borohydride with a concentration of 0.002g / ml to the above mixture, the molar ratio of sodium borohydride to chloroauric acid is 7:1, and ultrasonically vibrate to obtain a solution of S / Au with a ratio of 1:2. gold nanosol. Transmission electron microscopy confirmed that the average particle size of the nanoparticles was 10nm.

Embodiment 3

[0063] The preparation method of gold nano sol is as follows:

[0064] (1) Use deionized water to make chloroauric acid into an aqueous solution with a concentration of 0.6mmol / L, take 3mL of chloroauric acid solution in a conical flask, then add methanol at -1°C to the chloroauric acid aqueous solution, The volume ratio of acid aqueous solution to methanol is 1:1.4, and ultrasonically oscillated.

[0065] (2) Add an aqueous L-cysteine ​​solution with a concentration of 0.0016 g / ml to the above chloroauric acid solution so that the molar ratio of L-cysteine ​​to chloroauric acid is 1:2.5, and mix evenly by ultrasonic vibration.

[0066] (3) Add dropwise a methanol solution of sodium borohydride with a concentration of 0.002g / ml to the above mixture, the molar ratio of sodium borohydride to chloroauric acid is 6:1, and ultrasonically vibrate to obtain a solution of S / Au of 1:2.5. gold nanosol.

[0067] Transmission electron microscopy confirmed that the average particle size ...

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Abstract

The invention discloses an Au nano-sol responding to heavy metal ions and a preparation method thereof. Au nanoparticles in the sol are equipped with L-cysteine ligand, the mol ratio of the L-cysteine to the Au nanoparticles in the sol is 1:0.5-4, and the particle size of the Au nanoparticles is 5-15nm. The Au nanoparticles equipped with the L-cysteine ligand have long shelf life, good responsibility to the heavy metal ions, and are applicable to the detection field of the heavy metal ions; and the preparation method of the Au nano-sol has the advantages of simple process and low manufacturing cost.

Description

technical field [0001] The invention relates to a gold nano material, in particular to a gold nano sol with broad application prospects in the detection of heavy metal ions and a preparation method thereof. Background technique [0002] Gold nanoparticles have excellent stability and unique optical and electrical properties, showing potential application value in many fields. When the size of metal and semiconductor materials is reduced to the nanometer level, there will be "quantum size effect" and show specific optical and electronic properties, so they have broad application prospects in optoelectronic devices, sensors and other fields. The preparation and characterization of self-assembled functional thin films with nanoparticles as structural units has therefore become an important topic in material research. In particular, gold nanoparticles, due to their unique optical and electronic properties and their important application value in the fields of optoelectronics, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/22G01N33/52
Inventor 方少明陈志军李丁丁路文忠
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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