Nanorods versus Nanospheres: A Bifurcation Mechanism Revealed by Principal Component TEM Analysis
- 20 April 2010
- journal article
- Published by American Chemical Society (ACS) in Langmuir
- Vol. 26 (10), 6887-6891
- https://doi.org/10.1021/la100843k
Abstract
A quantitative analysis of object populations obtained by TEM images is performed for the classical scheme of aqueous seedless synthesis of nanorods. Using an effective way to represent nanoparticle size distributions, we unravel that spheres, usually considered to be a side-product, are in fact coming from a competing route during nanorod formation. The differentiation between spheres and rods appears above a critical size of 5 nm and is due to different growth rates between faces. The initial repartition of faces on nuclei or on the nanoparticles at the critical size can be the source for the final differentiation between globules and rods. The efficiency of the selection is strongly influenced by the production of the initial seeds and, in particular, by the amount of borohydride added in the present scheme.Keywords
This publication has 21 references indexed in Scilit:
- Photochemical Synthesis of Water-Soluble Gold Nanorods: The Role of Silver in Assisting Anisotropic GrowthChemistry of Materials, 2009
- Colloidal dispersion of gold nanorods: Historical background, optical properties, seed-mediated synthesis, shape separation and self-assemblyMaterials Science and Engineering: R: Reports, 2009
- High-Temperature Seedless Synthesis of Gold NanorodsThe Journal of Physical Chemistry B, 2006
- Gold nanorods: Synthesis, characterization and applicationsCoordination Chemistry Reviews, 2005
- Gram‐Scale Synthesis of Soluble, Near‐Monodisperse Gold Nanorods and Other Anisotropic NanoparticlesSmall, 2005
- Mechanisms Controlling Crystal Habits of Gold and Silver ColloidsAdvanced Functional Materials, 2005
- Seed-Mediated Synthesis of Gold Nanorods: Role of the Size and Nature of the SeedChemistry of Materials, 2004
- Preparation and Growth Mechanism of Gold Nanorods (NRs) Using Seed-Mediated Growth MethodChemistry of Materials, 2003
- Seeding Growth for Size Control of 5−40 nm Diameter Gold NanoparticlesLangmuir, 2001
- Wet Chemical Synthesis of High Aspect Ratio Cylindrical Gold NanorodsThe Journal of Physical Chemistry B, 2001