多元醇法合成银纳米线 ppt课件

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II: Nucleation of seeds
MTPs (multiply twinned particles 多重孪晶)
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3.2 Mechanism (Cont.)
I: Reduction II: Nucleation of seeds III: Heterogeneous nucleation and Crystal growth
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3.1 Introduction to polyol method
AgNO3
PVP( polyvinylpyrrolidoห้องสมุดไป่ตู้e 聚乙烯吡咯烷酮)
Injected using a two-channel syringe pump at a rate of 0.3 mL/min
EG (ethylene glycol 乙二醇)
Improvements: Less etching of MTPs, Less reaction time, Increasing concentration of AgNO3 for mass production
PVP
Serve as both capping agent and inducing agent
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Peng Jiang, et al.Chem.Eur.J.,2004,10,4817-4821
3.2 Mechanism (Cont.)
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Chang Chen, et al.Nanotechnology,2006,17:466-474
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3.2 Mechanism
I: Reduction II: Nucleation of seeds III: Heterogeneous nucleation and Crystal growth
I: Reduction
CH2OHCH2OH→ CH3CHO+H2O 2Ag+ +CH3CHO → 2Ag0+CH3COCOCH3+2H+ EG Serve as both reducing agent and solvent
2.Introduction to synthesis of silver nanowires
Approaches for synthesis of silver nanowires generally fall into one of two categories:
Template-directed
Biomdeidcal and chemical sensor
Catalysts
……
Silver nanowires rafts for trace analysis
Optical negative refraction
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Jie Yao, et al.Science,2008,321,930
Templates including porous alumina membranes, carbon nanotubes, DNA chains, rod-shaped micells……
Template-free
Wet chemical methods, vapor-phase synthesis……
1.The applications of silver nanowires
Due to some unique properties, including high electrical and thermal conductivities, silver nanowires can be used as: Optical polarizers(偏光器) Photonic crystals(光学晶体)
2. Introduction to synthesis of silver nanowires
3. Synthesis of silver nanowires based on the polyol method
• 3.1 Introduction to the polyol method • 3.2 Mechanism • 3.3 Improvements of the polyol method • 3.4 Further research
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3.3 Improvements
Several key factors
Formation of MTPs :
Requiring a low concentration of AgNO3
Etching of MTPs:
Requiring reducing the effct of oxygen on the activity of MTPs
多元醇法合成银纳米线
Synthesis of Silver Nanowires Based on the Polyol Method
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Synthesis of Silver Nanowires Based on the Polyol Method
Outline:
1. The applications of silver nanowires
Yugang Sun, et al. Nano Lett.,2003,3(7):955-959
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3.2 Mechanism (Cont.)
I: Reduction II: Nucleation of seeds III: Heterogeneous nucleation and Crystal growth
The mixture stirred and refluxed at 160°for 60 min
Separation by centrifugation, Purification
Ag nanowires
Yugang Sun, et al. Adv. Mater.,2002,14,83p3pt-课8件36
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