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Preparation method of monodisperse triangular nano-silver

A monodisperse, nano-silver technology, applied in the direction of nanotechnology, can solve the problems of inability to repeat experiments, and achieve the effect of guaranteed success rate of experiments, high output, and low equipment requirements

Active Publication Date: 2019-02-01
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the experiment, it was found that when the pH value of the PVP used was lower than 3.6, the experiment could not be repeated

Method used

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  • Preparation method of monodisperse triangular nano-silver
  • Preparation method of monodisperse triangular nano-silver
  • Preparation method of monodisperse triangular nano-silver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: average side length is 35 ± 4nm ( figure 1 A) the preparation method of triangular nano-silver flakes, the steps are:

[0035] (1) Add 60mL of n-amyl alcohol into a stoppered Erlenmeyer flask, and add 1.8g of PVP (Mw=30000g.mol) under stirring –1 ), drop 500 μL NaOH / n-pentanol saturated solution, and stir evenly.

[0036] (2) While stirring, add 3.9mL of AgNO with a concentration of 1.2wt% into the Erlenmeyer flask 3 For the aqueous solution, continue to stir for 30 minutes to form a ternary solution system of n-pentanol / PVP / water and put it into a 95°C thermostat for heat treatment for 40 hours;

[0037] (3) centrifuging the heat-treated reaction solution to obtain triangular nano-silver flakes.

Embodiment 2

[0038] Embodiment 2: average side length is 55 ± 5nm ( figure 1 The preparation method of the triangular nano-silver sheet of b), its steps are:

[0039] (1) Add 60mL of n-amyl alcohol into a stoppered Erlenmeyer flask, and add 1.8g of PVP (Mw=30000g.mol) under stirring –1 ), drop 350 μL NaOH / n-pentanol saturated solution, and stir evenly.

[0040] (2) While stirring, add 3.9mL of AgNO with a concentration of 1.2wt% into the Erlenmeyer flask 3 For the aqueous solution, continue to stir for 30 minutes to form a ternary solution system of n-pentanol / PVP / water and put it into a 95°C thermostat for heat treatment for 37 hours;

[0041] (3) centrifuging the heat-treated reaction solution to obtain triangular nano-silver flakes.

Embodiment 3

[0042] Embodiment 3: average side length is 70 ± 7nm ( figure 1 D) the preparation method of triangular nano-silver flakes, the steps are:

[0043] (1) Add 60mL of n-amyl alcohol into a stoppered Erlenmeyer flask, and add 1.8g of PVP (Mw=30000g.mol) under stirring –1 ), drop 175 μL NaOH / n-pentanol saturated solution, and stir evenly.

[0044] (2) While stirring, add 3.9mL concentration of 0.6wt% AgNO into the Erlenmeyer flask 3 For the aqueous solution, continue to stir for 30 minutes to form a ternary solution system of n-pentanol / PVP / water and put it into a 95°C thermostat for heat treatment for 32 hours;

[0045] (3) centrifuging the heat-treated reaction solution to obtain triangular nano-silver flakes.

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Abstract

The invention provides a preparation method of monodisperse triangular nano-silver. The method comprises the following steps of (1) adding dropwise sodium hydroxide / amyl alcohol saturated solution, and mixing n-amyl alcohol, PVP and a NaOH mixed solution; (2) adding an AgNO3 aqueous solution with the concentration of 0.6-1.2wt% into the mixed solution under stirring, and then placing the mixture into a thermostat with the temperature of 60-95 DEG C for heat treatment; and (3) centrifuging the heat-treated reaction solution to obtain the triangular nano-silver sheet. According the preparation method of the monodisperse triangular nano-silver, adjusting NaOH / amyl alcohol saturated solution and a PVP adding amount can be prepared into the triangular nano-silver sheet in the range of 35-90 nm;the preparation method has the advantages of being low in cost, easy to operate, free of complex equipment, capable of realizing mass production and the like, the stability and the monodispersity areimproved, and the preparation method is expected to have a wide application prospect in a solar cell, an optical sensor, a surface enhanced raman scattering (SERS), catalysis, biological detection and the like.

Description

technical field [0001] The invention relates to a preparation method of monodisperse triangular nano-silver flakes. Background technique [0002] Noble metal nanoparticles have broad application prospects due to their unique optical, electrical, and chemical properties. Triangular silver nanoparticles, as a typical noble metal nanoparticle, have a wide range of applications in solar cells, optical sensors, surface-enhanced Raman scattering (SERS), catalysis, and biological detection. So far, the reported synthesis methods of triangular nano-silver include light-induced transformation, thermodynamic transformation, template induction method, seed crystal method and so on. Among the reported preparation methods, only the light-induced method and the seed crystal method can achieve continuously adjustable high-purity monodisperse triangular silver nanosheets, but the light-induced method requires continuous irradiation of light with a specific frequency during the preparation ...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
CPCB82Y40/00B22F9/24
Inventor 张志山顾民章建辉连亚东
Owner NANJING UNIV
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