Journal Article

Real-Time Imaging of Pt₃Fe Nanorod Growth in Solution

Zheng, Haimei, Liao, Hong-Gang, Cui, Likun, Whitelam, Stephen

2012

Overview

The growth of colloidal nanocrystal architectures by nanoparticle attachment is frequently reported as an alternative to the conventional growth by monomer attachment. However, the mechanism whereby nanoparticle attachment proceeds microscopically remains unclear. We report real-time transmission electron microscopy (TEM) imaging of the solution growth of Pt₃Fe nanorods from nanoparticle building blocks. Observations revealed growth of winding polycrystalline nanoparticle chains by shape-directed nanoparticle attachment followed by straightening and orientation and shape corrections to yield single-crystal nanorods. Tracking nanoparticle growth trajectories allowed us to distinguish the force fields exerted by single nanoparticles and nanoparticle chains. Such quantification of nanoparticle interaction and understanding the growth pathways are important for the design of hierarchical nanomaterials and controlling nanocrystal self-assembly for functional devices.

• Publisher: American Association for the Advancement of Science,The American Association for the Advancement of Science
• Subject: Architecture / Coalescence / Cross-disciplinary physics: materials science; rheology / Crystal lattices / Dimers / Exact sciences and technology / Growth from solutions / image analysis / Imaging / Iron / Liquids / Lithium / Materials science / Methods of crystal growth; physics of crystal growth / Methods of nanofabrication / Monomers / Nanocrystals / Nanoparticles / Nanorods / Nanostructure / Nanotechnology / Nanowires / Physics / Rods / Self-assembly / Solid solutions / Surfactants / Transmission electron microscopy / yields