Preparation method of triangular silver nanosheet

A technology of triangular silver and nanosheets, which is applied in the field of preparation of triangular silver nanomaterials, can solve problems such as complicated operation, and achieve the effects of simple operation, low production cost and rapid production.

Active Publication Date: 2011-01-19
南通丝乡丝绸有限公司 +1
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  • Abstract
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Problems solved by technology

This preparation method cannot be carried out at room temperature an

Method used

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  • Preparation method of triangular silver nanosheet
  • Preparation method of triangular silver nanosheet
  • Preparation method of triangular silver nanosheet

Examples

Experimental program
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Embodiment 1）

[0020] The preparation method of the triangular silver nanosheet of the present embodiment has the following steps:

[0021] ① Silver nitrate (AgNO 3 ), trisodium citrate (Na 3 C 6 h 5 o 7 2H 2 O) and polyvinylpyrrolidone (PVP), these three reagents were mixed in a molar ratio of 2:30:1, and stirred for 5 min at a temperature of 10°C. The solution at this time is colorless, the solution is silver nitrate (AgNO 3 ), trisodium citrate (Na 3 C 6 h 5 o 7 2H 2 O) and polyvinylpyrrolidone (PVP) mixed system.

[0022] ②Quickly add an appropriate amount of sodium borohydride (NaBH 4 ) reagent is added to the mixed system obtained in step ①, so that silver nitrate (AgNO 3 ) with sodium borohydride (NaBH 4 ) to form a reduction reaction of round silver nanoparticles, the ratio of the molar amount of sodium borohydride reagent to the molar amount of polyvinylpyrrolidone is 0.1, and the solution at this time appears bright yellow, that is, the size of the silver nanoparticle...

Embodiment 2）

[0025] The remainder of the preparation method of the triangular silver nanosheets of this embodiment is the same as in Example 1, except that sodium borohydride (NaBH 4 ) The molar addition amount is 0.12 times of the polyvinylpyrrolidone molar dosage. The total amount of molar addition of hydrogen peroxide is 0.8 times of the molar amount of polyvinylpyrrolidone, and the stirring time of successively adding hydrogen peroxide is extended by 2 minutes. Finally, triangular silver nanosheets with a size of 60nm-70nm and some round particles are obtained.

Embodiment 3）

[0027] The rest of the preparation method of a triangular silver nanosheet of the present embodiment is the same as in Example 1, except that sodium borohydride (NaBH 4 ) molar addition is 0.1 times the molar dosage of polyvinylpyrrolidone. The total amount of molar addition of hydrogen peroxide is 0.9 times of the molar amount of polyvinylpyrrolidone, and the stirring time of successively adding hydrogen peroxide is extended by 4 minutes. Finally, triangular silver nanosheets with a size of 70nm-80nm and some round particles are obtained.

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Abstract

The invention relates to a preparation method of a triangular silver nanosheet, which comprises the following steps: firstly, mixing three types of reagents of oxyacid silver, trisodium citrate (Na3C6H5O7.2H2O) and polyvinyl pyrrolidone (PVP) according to a certain molar ratio; stirring for 4-10min at the temperature of 0 DEG C-30 DEG C; adding a proper amount of sodium borohydride (NaBH4) reagent into the mixed system; and then, adding a proper amount of hydrogen peroxide the mass fraction of which is 10%-30% to finally obtain the triangular silver nanosheet the size of which is 50nm-120nm. The method for preparing the triangular silver nanosheet has simple operation and high success ratio and can be carried out at normal temperature.

Description

technical field [0001] The invention relates to a preparation method of a triangular silver nanometer material. Background technique [0002] Noble metal nanoparticles have special physical properties and are widely used in catalysis, surface-enhanced Raman scattering, optoelectronics, biomarkers, information storage and other fields. The research on metal nanoparticles, especially the research on their shape-controllable preparation and their corresponding properties and applications, has always been a frontier hotspot in materials science and related fields. Triangular silver nanosheets have a special surface plasmon resonance (SPR) absorption spectrum, with weak out-of-plane quadrupole, in-plane quadrupole and strong in-plane bipolar SPR peaks, and have structure dependence and artificial Therefore, triangular silver nanosheets have broad application prospects in the fields of bioimaging, biosensors, detection of biomolecules and inorganic ions, and optical sensors. [...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 庄严王琪周全法朱炳龙
Owner 南通丝乡丝绸有限公司
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