Snowflake-like structural assembly of isotropic gold nanoparticles (GNPs) is reported. A modified polyamine method has been employed to synthesize positively charged GNPs in presence of a polymeric metaphosphate. This process yields fascinating dendritic self-assembled morphologies. Structural characterization revealed that there was aggregation of crystalline GNPs. The aggregates of GNPs formed in the initial stage of synthesis are assumed to act as the bulging seeds for final growth of complex morphologies at nanometer to micrometer length scale. Self-assembly of GNPs was found to be greatly influenced by the concentration of gold precursor. Diffusion limited aggregation of GNPs is suggested as the plausible mechanism for this nanoparticle selforganization process.
Bibliographical noteFunding Information:
Acknowledgments Financial support for this investigation was provided by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (MOST, No. 2009-008-0602 & No. R01-2007-000-11851-0) and the Brain Korea 21 (BK21) program.
- Gold nanoparticles
ASJC Scopus subject areas
- General Chemistry
- Atomic and Molecular Physics, and Optics
- Modelling and Simulation
- General Materials Science
- Condensed Matter Physics