1. Wu, Z. Wang, and H. Fan, “Stress-Induced Nanoparticle Crystallization” Journal of the American Chemical Society, 136, 7634-7636, May 28, 2014.

Scientific Achievement

Applying compressive stress to self-assembled nanoparticle arrays eliminated defects, improved structural properties, and enabled oriented crystallization at room temperature.

Significance and Impact

This is the first demonstration that pressure annealing of nanoparticle arrays enables room temperature defect reduction and long range ordering. Single crystal-like nanoparticle assemblies are expected to display efficient electrical and optical energy transfer.

Research Details

–Diamond anvil cell application of ∼6 GPa hydrostatic stress to gold nanoparticles was monitored by in situ high pressure small angle X-ray scattering (HP-SAXS).

–Hydrostatic stress > 4.4 GPa rebalanced interparticle forces, eliminated defects and developed a quasi-single crystalline nanoparticle superstructure.