CN101695756A - Method for preparing gold-silver alloy nanoparticles in polyelectrolyte multilayer film - Google Patents
Method for preparing gold-silver alloy nanoparticles in polyelectrolyte multilayer film Download PDFInfo
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- CN101695756A CN101695756A CN200910217793A CN200910217793A CN101695756A CN 101695756 A CN101695756 A CN 101695756A CN 200910217793 A CN200910217793 A CN 200910217793A CN 200910217793 A CN200910217793 A CN 200910217793A CN 101695756 A CN101695756 A CN 101695756A
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Abstract
The invention relates to a method for preparing gold-silver alloy nanoparticles in a polyelectrolyte multilayer film, which comprises the following steps of: preparing a multilayer film which contains a branched polyethyleneimine or a linear polyethyleneimine and a polyacrylic acid or a polymethylacrylic acid through self-assembly of connecting one layer by one layer; sequentially soaking the multilayer film in aqueous solutions of a chloroauric acid and a silver nitrate; heating the multilayer film absorbed with gold and silver ions in an oven for reduction; and obtaining the gold-silver alloy nanoparticles. The obtained gold-silver alloy nanoparticles have characteristic surface plasmas which resonate to absorb signals, and have very high application value in the fields of catalyst, photics and the like.
Description
Technical field
The present invention relates to a kind of method that in polyelectrolyte multilayer film, prepares gold-silver alloy nanoparticles.
Background technology
The bimetal nano material all has potential using value in a lot of fields because of physics, the chemical property that has two kinds of metal components simultaneously, such as catalysis, optical detection, immunoassay, information storage etc.The gold and silver nano particle is owing to optics, the electronics character of the uniqueness that it produced have important basic research and actual application value, for example can be as the base material of tunable surface enhanced Raman scattering effect, or as surface plasma resonance sensor etc.The Dor nano material comprises gold and silver nucleocapsid structure and electrum structure, and is wherein less relatively about the research of gold-silver alloy nanoparticles.At present, the synthetic of gold-silver alloy nanoparticles mainly concentrates on the various methods that prepare nano particle of development in the liquid phase, and these alloy nano particles all need to be fixed to (B.H.Ong in substrate or the film phase material in actual applications, et al, Fiber Integr.Opt.2007,26,229; X.Liu, et al, Chem.Mater.2009,21,410).Of the present invention in polyelectrolyte multilayer film the method for in situ preparation gold-silver alloy nanoparticles do not appear in the newspapers as yet.
Summary of the invention
The purpose of this invention is to provide a kind of method that in polyelectrolyte multilayer film, prepares gold-silver alloy nanoparticles.
Described preparation method may further comprise the steps:
1) be that 7: 3 mass percent is after 98% sulfuric acid and mass percent are to soak 30 fens kinds in the mixed solution of 30% hydrogen peroxide, with pure water this sheet glass to be rinsed well with sheet glass in volume ratio;
2) sheet glass that step 1) was handled is 5.0-9.0 at pH, and concentration is to soak 10 minutes in the aqueous solution of the polymine of branching of 5mg/ml or linear polymine, and is clean with pure water rinsing;
3) then, with step 2) to be soaked in pH be 3.0-7.0 for the sheet glass handled, and concentration is the polyacrylic acid of 5mg/ml or polymethyl acid solution 10 minutes, and water is rinsed well again;
4) repeating step 2) and step 3), polyelectrolyte multilayer film obtained;
5) polyelectrolyte multilayer film that step 4) is obtained is 2.0-3.0 at pH, and concentration is to soak 15 minutes in the aqueous solution of gold chloride of 5mM, and is clean with pure water rinsing; In the aqueous solution of 10mM silver nitrate, soaked 1-10 minute then, clean with pure water rinsing; This multilayer film that will obtain at last places baking oven, heats 1 hour down at 200 ℃, obtains gold-silver alloy nanoparticles.
Beneficial effect: characteristics of the present invention are directly to connect a layer self assembly polyelectrolyte multilayer film by the electrostatic interaction layer on base material, behind the ion of ADSORPTION OF GOLD and silver, prepare gold-silver alloy nanoparticles by adding thermal reduction successively.Whole process of preparation is easy and simple to handle, directly obtains nano particle in multilayer film, and particle diameter is 3.8 ± 0.8nm.This method can be used for preparing the preparation of the alloy that contains different gold and silver ratios.The gold-silver alloy nanoparticles that is obtained has the surface plasma body resonant vibration absorption signal of feature, has high using value in fields such as catalysis, optics.
Description of drawings
Fig. 1 is that particle diameter is that 3.8 ± 0.8nm, gold and silver atomic molar ratio are the transmission electron microscope picture of 2: 3 gold-silver alloy nanoparticles.
Fig. 2 is the ultraviolet-visible absorption spectroscopy figure of gold-silver alloy nanoparticles, and the gold, silver atomic molar ratio of absorption curve 1 to 3 expression gold-silver alloy nanoparticles wherein was followed successively by 17: 3,11: 9,2: 3.
The specific embodiment
Embodiment 1:
1) be that 7: 3 mass percent is after 98% sulfuric acid and mass percent are to soak 30 fens kinds in the mixed solution of 30% hydrogen peroxide, with pure water this sheet glass to be rinsed well with sheet glass in volume ratio;
2) sheet glass that step 1) was handled is 7.0 at pH, and concentration is to soak 10 minutes in the aqueous solution of polymine of branching of 5mg/ml, and is clean with pure water rinsing;
3) then, with step 2) to be soaked in pH be 3.5 to sheet glass, concentration is the polyacrylic acid solution 10 minutes of 5mg/ml, and is clean with pure water rinsing again;
4) repeating step 2) and step 3) be 7 polyelectrolyte multilayer film to the double-deck number that obtains polyelectrolyte;
5) the double-deck number that step 4) is obtained is that 7 polyelectrolyte multilayer film is 2.0 at pH, and concentration is to soak 15 minutes in the aqueous solution of gold chloride of 5mM, and is clean with pure water rinsing; Be to soak 10 minutes in the aqueous solution of 10mM silver nitrate in concentration then, clean with pure water rinsing; At last, this multilayer film that obtains is placed baking oven, heated 1 hour down, promptly obtain gold-silver alloy nanoparticles at 200 ℃.Can clearly see the existence of product nano particle from Fig. 1.
Embodiment 2:
1) be that 7: 3 mass percent is after 98% sulfuric acid and mass percent are to soak 30 fens kinds in the mixed solution of 30% hydrogen peroxide, with pure water this sheet glass to be rinsed well with sheet glass in volume ratio;
2) sheet glass that step 1) was handled is 9.0 at pH, and concentration is to soak 10 minutes in the aqueous solution of polymine of branching of 5mg/ml, and is clean with pure water rinsing;
3) then sheet glass being soaked in pH is 3.0, and concentration is the polyacrylic acid solution 10 minutes of 5mg/ml, and is clean with pure water rinsing again;
4) repeating step 2) and step 3) be 7 polyelectrolyte multilayer film to the double-deck number that obtains polyelectrolyte;
5) the double-deck number that step 4) is obtained is that 7 polyelectrolyte multilayer film is 2.5 at pH, and concentration is to soak 15 minutes in the aqueous solution of gold chloride of 5mM, and is clean with pure water rinsing; Be to soak 10 minutes in the aqueous solution of 10mM silver nitrate in concentration then, clean with pure water rinsing; This multilayer film that will obtain at last places baking oven, heats 1 hour down at 200 ℃, promptly obtains gold-silver alloy nanoparticles.
Embodiment 3:
1) be that 7: 3 mass percent is after 98% sulfuric acid and mass percent are to soak 30 fens kinds in the mixed solution of 30% hydrogen peroxide, with pure water this sheet glass to be rinsed well with sheet glass in volume ratio;
2) sheet glass that step 1) was handled is 5.0 at pH, and concentration is to soak 10 minutes in the aqueous solution of polymine of branching of 5mg/ml, and is clean with pure water rinsing;
3) then sheet glass being soaked in pH is 7.0, and concentration is the polyacrylic acid solution 10 minutes of 5mg/ml, and is clean with pure water rinsing again;
4) repeating step 2) and step 3) be 5 polyelectrolyte multilayer film to the double-deck number that obtains polyelectrolyte;
5) the double-deck number that step 4) is obtained is that 5 polyelectrolyte multilayer film is 3.0 at pH, and concentration is to soak 15 minutes in the aqueous solution of gold chloride of 5mM, and is clean with pure water rinsing; Be to soak 10 minutes in the aqueous solution of 10mM silver nitrate in concentration then, clean with pure water rinsing; This multilayer film that will obtain at last places baking oven, heats 1 hour down at 200 ℃, promptly obtains gold-silver alloy nanoparticles.
Embodiment 4:
1) be that 7: 3 mass percent is after 98% sulfuric acid and mass percent are to soak 30 fens kinds in the mixed solution of 30% hydrogen peroxide, with pure water this sheet glass to be rinsed well with sheet glass in volume ratio;
2) sheet glass that step 1) was handled is 7.0 at pH, and concentration is to soak 10 minutes in the aqueous solution of polymine of branching of 5mg/ml, and is clean with pure water rinsing;
3) then sheet glass being soaked in pH is 3.5, and concentration is the polyacrylic acid solution 10 minutes of 5mg/ml, and is clean with pure water rinsing again;
4) repeating step 2) and step 3) be 7 polyelectrolyte multilayer film to the double-deck number that obtains polyelectrolyte;
5) the double-deck number that step 4) is obtained is that 7 polyelectrolyte multilayer film is 2.0 at pH, and concentration is to soak 15 minutes in the aqueous solution of gold chloride of 5mM, and is clean with pure water rinsing; Be to soak 5 minutes in the aqueous solution of 10mM silver nitrate in concentration then, clean with pure water rinsing; This multilayer film that will obtain at last places baking oven, heats 1 hour down at 200 ℃, promptly obtains gold-silver alloy nanoparticles.
Embodiment 5:
1) be that 7: 3 mass percent is after 98% sulfuric acid and mass percent are to soak 30 fens kinds in the mixed solution of 30% hydrogen peroxide, with pure water this sheet glass to be rinsed well with sheet glass in volume ratio;
2) sheet glass that step 1) was handled is 7.0 at pH, and concentration is to soak 10 minutes in the aqueous solution of polymine of branching of 5mg/ml, and is clean with pure water rinsing;
3) then sheet glass being soaked in pH is 3.5, and concentration is the polyacrylic acid solution 10 minutes of 5mg/ml, and is clean with pure water rinsing again;
4) repeating step 2) and step 3) be 7 polyelectrolyte multilayer film to the double-deck number that obtains polyelectrolyte;
5) the double-deck number that step 4) is obtained is that 7 polyelectrolyte multilayer film is 2.0 at pH, and concentration is to soak 15 minutes in the aqueous solution of gold chloride of 5mM, and is clean with pure water rinsing; Be to soak 1 minute in the aqueous solution of 10mM silver nitrate in concentration then, clean with pure water rinsing; This multilayer film that will obtain at last places baking oven, heats 1 hour down at 200 ℃, promptly obtains gold-silver alloy nanoparticles.
Embodiment 6:
1) be that 7: 3 mass percent is after 98% sulfuric acid and mass percent are to soak 30 fens kinds in the mixed solution of 30% hydrogen peroxide, with pure water this sheet glass to be rinsed well with sheet glass in volume ratio;
2) sheet glass that step 1) was handled is 7.0 at pH, and concentration is to soak 10 minutes in the aqueous solution of polymine of linearity of 5mg/ml, and is clean with pure water rinsing;
3) then sheet glass being soaked in pH is 3.5, and concentration is the polyacrylic acid solution 10 minutes of 5mg/ml, and is clean with pure water rinsing again;
4) repeating step 2) and step 3) be 7 polyelectrolyte multilayer film to the double-deck number that obtains polyelectrolyte;
5) the double-deck number that step 4) is obtained is that 7 polyelectrolyte multilayer film is 2.0 at pH, and concentration is to soak 15 minutes in the aqueous solution of gold chloride of 5mM, and is clean with pure water rinsing; Be to soak 10 minutes in the aqueous solution of 10mM silver nitrate in concentration then, clean with pure water rinsing; This multilayer film that will obtain at last places baking oven, heats 1 hour down at 200 ℃, promptly obtains gold-silver alloy nanoparticles.
Embodiment 7:
1) be that 7: 3 mass percent is after 98% sulfuric acid and mass percent are to soak 30 fens kinds in the mixed solution of 30% hydrogen peroxide, with pure water this sheet glass to be rinsed well with sheet glass in volume ratio;
2) sheet glass that step 1) was handled is 7.0 at pH, and concentration is to soak 10 minutes in the aqueous solution of polymine of branching of 5mg/ml, and is clean with pure water rinsing;
3) then sheet glass being soaked in pH is 3.5, and concentration is the polymethyl acid solution 10 minutes of 5mg/ml, and is clean with pure water rinsing again;
4) repeating step 2) and step 3) be 7 polyelectrolyte multilayer film to the double-deck number that obtains polyelectrolyte;
5) the double-deck number that step 4) is obtained is that 7 polyelectrolyte multilayer film is 2.0 at pH, and concentration is to soak 15 minutes in the aqueous solution of gold chloride of 5mM, and is clean with pure water rinsing; Be to soak 10 minutes in the aqueous solution of 10mM silver nitrate in concentration then, clean with pure water rinsing; This multilayer film that will obtain at last places baking oven, heats 1 hour down at 200 ℃, promptly obtains gold-silver alloy nanoparticles.
Embodiment 8:
1) be that 7: 3 mass percent is after 98% sulfuric acid and mass percent are to soak 30 fens kinds in the mixed solution of 30% hydrogen peroxide, with pure water this sheet glass to be rinsed well with sheet glass in volume ratio;
2) sheet glass that step 1) was handled is 7.0 at pH, and concentration is to soak 10 minutes in the aqueous solution of polymine of linearity of 5mg/ml, and is clean with pure water rinsing;
3) then sheet glass being soaked in pH is 3.5, and concentration is the polymethyl acid solution 10 minutes of 5mg/ml, and is clean with pure water rinsing again;
4) repeating step 2) and step 3) be 7 polyelectrolyte multilayer film to the double-deck number that obtains polyelectrolyte;
5) the double-deck number that step 4) is obtained is that 7 polyelectrolyte multilayer film is 2.0 at pH, and concentration is to soak 15 minutes in the aqueous solution of gold chloride of 5mM, and is clean with pure water rinsing; Be to soak 10 minutes in the aqueous solution of 10mM silver nitrate in concentration then, clean with pure water rinsing; This multilayer film that will obtain at last places baking oven, heats 1 hour down at 200 ℃, promptly obtains gold-silver alloy nanoparticles.
Curve 1-3 among Fig. 2 is respectively embodiment 5,4, the ultraviolet-visible absorption spectroscopy of 1 gold-silver alloy nanoparticles that makes, show that the nano particle that makes has unimodal plasma and absorbs feature, its absworption peak is between monometallic Nano silver grain and golden nanometer particle, and along with the increase of the mol ratio of silver ion in the system and gold ion, absworption peak moves to short wavelength's direction.
Claims (1)
1. method for preparing gold-silver alloy nanoparticles in polyelectrolyte multilayer film is characterized in that step and condition are as follows:
1) be that 7: 3 mass percent is after 98% sulfuric acid and mass percent are to soak 30 fens kinds in the mixed solution of 30% hydrogen peroxide, with pure water this sheet glass to be rinsed well with sheet glass in volume ratio;
2) sheet glass that step 1) was handled is 5.0-9.0 at pH, and concentration is to soak 10 minutes in the aqueous solution of the polymine of branching of 5mg/ml or linear polymine, and is clean with pure water rinsing;
3) then, with step 2) to be soaked in pH be 3.0-7.0 for the sheet glass handled, and concentration is the polyacrylic acid of 5mg/ml or polymethyl acid solution 10 minutes, and water is rinsed well again;
4) repeating step 2) and step 3), polyelectrolyte multilayer film obtained;
5) polyelectrolyte multilayer film that step 4) is obtained is 2.0-3.0 at pH, and concentration is to soak 15 minutes in the aqueous solution of gold chloride of 5mM, and is clean with pure water rinsing; In the aqueous solution of 10mM silver nitrate, soaked 1-10 minute then, clean with pure water rinsing; This multilayer film that will obtain at last places baking oven, heats 1 hour down at 200 ℃, obtains gold-silver alloy nanoparticles.
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