Gold Nanoparticles and Ligands by Heartsound Audio

 



Gold nanoparticles have been intensely researched for decades due to their applications as catalysts and medicine. 

“Surface ligands” are organic molecules Typically, present on the surface of gold nanoparticles. During synthesis, the surface ligands Play a huge role in controlling both size and shape of the nanoparticles. 

For several decades Luis Liz-Marzan has studied growth  mechanisms, and physical properties of these nanoparticles. Numerous advances have been made recognizing the importance of surface ligands, However, many questions remain about their exact behavior during and after growth. Direct observation has been a long-term goal .  .  . For a long time! 

Using transmission electron microscopy (TEM) Teams have begun to characterize Surface ligands By means of TEM in a liquid environment. 

The team encapsulated gold nanorods Surrounded by ligands Routinely used in synthesis between two sheets of Graphene, creating a small liquid cell. Graphene not only enhances TEM Imaging it reduces electron beam damage due to its excellent thermal and electrical properties. The team was able to visualize the Ligand shell And determine its composition.

The results of the study have provided fresh insights into the structure of the surface layer formed by ligands. In particular, a real time observation of a micelle (cluster of ligands) Moving and colliding with an adjunct gold nanorod …Challenges the model of a possible static and uniform ligand layer! 

This groundbreaking research, recently published in Nature Chemistry, Not only advances the understanding of the relationship between gold nanoparticles and ligands, It also provides an advanced characterization tool for the design of future nano materials! 


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