DENSsolutions Comments

Nanoparticles of gold are currently attracting considerable attention for use in biomedical applications including drug delivering, heating, sensing and in nanocatalysis. However, our ability to control the properties upon which these applications are based is still intrinsically linked to the nanomorphology of individual particles.
Most theoretical models predict that, in general, the more perfect the nanoparticles, the better they perform. However, real nanoparticles are rarely crystallographically ideal, and planar defects such as contact twins and intrinsic or extrinsic stacking faults, form during growth in materials with low stacking fault or twin boundary energy, and surface energy anisotropy.  Gold features in this group, often exhibiting structural and morphological modifications including single or multiple (parallel, contact) twinning and cyclic twinning resulting in decahedral and truncated decahedral structures. Verifying a phase map given by theoretical simulation is very challenging undertaking, which requires mapping gold particles at various elevated temperatures.
The researchers using a range of DENSsolutions heating systems were able to observe gold particles at various elevated temperature. The extreme low drift at elevated temperature allows structural and shape transformations in individual gold particles that could be imaged with atomic resolution. By using approach, the researchers succeed in mapping the gold phase diagram experimentally.