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Method for preparing high-stability polymer coated nano silver cluster

A technology of silver nanoclusters and high stability, which is applied in the direction of nanotechnology, can solve problems such as high cost, limited development, and difficulty in controlling the stability of silver nanoclusters, and achieve stable performance, low price, and high practical value. Effect

Inactive Publication Date: 2012-10-17
HUBEI FORBON TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, at present, gold nanoclusters are more researched at home and abroad, and the development of silver nanoclusters is difficult to control because of its stability.
Secondly, most of the modifiers selected for the preparation of gold-silver nanoclusters are relatively expensive reagents such as DNA, and the cost is relatively high.

Method used

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  • Method for preparing high-stability polymer coated nano silver cluster
  • Method for preparing high-stability polymer coated nano silver cluster
  • Method for preparing high-stability polymer coated nano silver cluster

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Synthesis of silane-Ag complex: First, weigh 0.0370 g of silver nitrate and dissolve it in 20 ml of methanol, then add 200 uL of 3-aminopropyltriethoxysilane APTES into it, and stir for 1 h in the dark;

[0018] 2) Synthesis of polymer-modified silver nanoclusters: Weigh 0.0363 g of polyethyleneimine PEI and dissolve it in 1 ml of water, add it to the solution in step 1), and stir for 3 min; then add 40 uL of anhydrous formaldehyde, and continue to darken Stir for 6 h to obtain a yellow-brown solution, precipitate and filter to obtain polymer-modified silver nanoclusters, and the TEM image of the polymer-modified silver nanoclusters is as follows figure 1 shown.

[0019] 3) The prepared silver nanoclusters were used for the detection of Hg, and the detection limit was 0.1 nmol / L.

Embodiment 2

[0021] 1) Synthesis of silane-Ag complex: First, weigh 0.0616 g of silver nitrate and dissolve it in 30 ml of methanol, then add 338 uL of 3-(2-aminoethyl)aminopropyltrimethoxysilane APTMOS to it, dark Stir at place for 2 h;

[0022] 2) Synthesis of polymer-modified silver nanoclusters: Weigh 0.0605 polyamide-amine dendrimer PAMAM and dissolve it in 20 ml water, add it to the solution in step 1), stir for 1 min; then add 10 uL anhydrous Formaldehyde, continue to stir in the dark for 5 h to obtain a yellow solution, precipitate and filter to obtain polymer-modified silver nanoclusters, and the TEM image of the polymer-modified silver nanoclusters is as follows: figure 2 shown.

[0023] 3) The prepared silver nanoclusters were used for the detection of Hg, and the detection limit was 0.1 nmol / L.

Embodiment 3

[0025] 1) Synthesis of silane-Ag complex: First, weigh 0.0986 g of silver nitrate and dissolve it in 10 ml of methanol, then add 600 uL of 4-aminobutyltrimethoxysilane to it, and stir for 4 hours in the dark;

[0026] 2) Synthesis of polymer-modified silver nanoclusters: Weigh 0.0968 g of polymethyl acrylate PMAA and dissolve it in 15 ml of water, add it to the solution in step 1), and stir for 30 min; then add 100uL formaldehyde, and continue stirring in the dark for 3 h , to obtain a yellow solution, precipitate and filter to obtain polymer-modified silver nanoclusters, and the TEM image of the polymer-modified silver nanoclusters is as follows image 3 shown.

[0027] 3) The prepared silver nanoclusters were used for the detection of Hg, and the detection limit was 0.1 nmol / L.

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Abstract

The invention discloses a method for preparing a high-stability polymer coated a nano silver cluster, and is characterized by comprising the following steps of: (1) synthesizing a silane-Ag complex, namely dissolving 0.0370 to 0.0986 gram of silver nitrate in 10 to 30 milliliters of absolute methanol, adding 200 to 600 mu litters of silane, and stirring in a dark place for 1 to 4 hours; (2) synthesizing a polymer-modified nano silver cluster, namely dissolving 0.0363 to 0.0968 gram of polymer in 1 to 20 milliliters of water, adding solution formed by the step (1), stirring for 1 to 30 minutes; and (3) adding 10 to 100 mu liters of absolute formaldehyde, stirring in a dark place for 3 to 6 hours, obtaining a yellow solution, settling and filtering to obtain the polymer-modified nano silver cluster. The polymer-modified nano silver cluster synthesized by the method has the advantages of low price, stable performance, no toxicity and the like. The cluster has very high practical value and has a great prospect in environment analysis, biochemical analysis, food safety and other fields.

Description

Technical field: [0001] The invention belongs to the field of nanomaterial preparation and relates to a method for preparing silver nanoclusters wrapped by high-stable polymers. Background technique: [0002] Clusters are relatively stable aggregates composed of several to thousands of atoms, molecules, and ions through physical and chemical binding forces, and their spatial dimensions range from several angstroms to hundreds of angstroms. Due to the special size of the cluster, it has a series of physical and chemical properties different from single atoms, molecules, and bulk solid materials. The quantum size effect and nonlinear effect of the conductance, the geometric size effect of the conductance, the conductivity and superconductivity of the doped and doped atoms, the conductivity of carbon tubes and carbon onions, etc. [0003] In recent years, noble metal (gold, silver) nanoclusters have become one of the hotspots in the field of nanomaterials research because of t...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02B82Y40/00
Inventor 何瑜王仁宗宋功武朱晶晶
Owner HUBEI FORBON TECH
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