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Controlled Synthesis of Platinum and Silver Nanoparticles Using Multivalent Ligands
Suguna Perumal1,2, Raji Atchudan3, Eckart Rühl1
1Physikalische Chemie, Institut für Chemie und Biochemie, Freie Universität Berlin, 14195 Berlin, Germany.
Nanomaterials (Basel, Switzerland)
|July 9, 2022
Summary
Controlled synthesis of platinum and silver nanoparticles (PtNPs and AgNPs) was achieved using amine ligands. Ligand multivalency and temperature influenced nanoparticle size and shape, with specific conditions yielding monodispersed, spherical PtNPs and AgNPs.
Area of Science:
- Nanotechnology
- Materials Science
- Chemical Synthesis
Background:
- Controlling nanoparticle synthesis is crucial for applications.
- Amine-functionalized multivalent ligands offer tunable properties for nanoparticle formation.
- Understanding the impact of reaction parameters is key to reproducible synthesis.
Purpose of the Study:
- To investigate the controlled formation of platinum nanoparticles (PtNPs) and silver nanoparticles (AgNPs).
- To systematically study the effects of reaction temperature and ligand multivalency on PtNP and AgNP growth kinetics, size, and shape.
- To explore both stepwise and one-step synthesis processes.
Main Methods:
- Synthesis of PtNPs and AgNPs using platinum (II) acetylacetonate and silver (I) acetylacetonate, respectively.
- Utilized amine-functionalized multivalent ligands.
- Characterization via transmission electron microscopy (TEM) for PtNPs and AgNPs.
- UV-Vis absorption spectroscopy for AgNP characterization.
Main Results:
- PtNPs synthesized via a stepwise process (160-200 °C) were monodispersed and spherical, irrespective of ligand multivalency or temperature.
- In a one-step process, ligand affinity influenced PtNP shape.
- AgNP formation using mono-, di-, and trivalent ligands showed narrower size distributions with increasing temperature (80-120 °C) and a trivalent ligand in a one-step process.
Conclusions:
- Amine-functionalized multivalent ligands enable controlled synthesis of PtNPs and AgNPs.
- Reaction temperature and ligand multivalency are critical parameters affecting nanoparticle characteristics.
- Both stepwise and one-step methods provide pathways to tune nanoparticle size and shape for specific applications.
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