About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
|
Symposium
|
Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
|
Presentation Title |
Adhesion and Stability of Nanoparticles: Direct Measurements Using In Situ TEM |
Author(s) |
Tevis D.B. Jacobs, Andrew Baker, Sai Vishnubhotla, Sanjana Karpe, Yahui Yang, Götz Veser |
On-Site Speaker (Planned) |
Tevis D.B. Jacobs |
Abstract Scope |
Metal nanoparticles are critical as plasmonic sensors, nanophotonic devices, and nanostructured catalysts. Their performance and lifetime depend on the strength of interactions to their supports. Only a single experimental technique can measure these interactions, but is limited to monometallic systems and cannot inform the rapidly-emerging field of alloy nanoparticles. We present a novel technique, combining the spatial resolution of transmission electron microscopy with the force resolution of atomic force microscopy, to directly measure the formation and separation of the particle-support interface. We validated the technique with monometallic nanoparticles, then measured adhesion in three bimetallic systems. The results showed complex, non-monotonic relationships between adhesion and composition. Using an analytical model of bonding, we show that adhesion is governed by charge transfer between constituent metals. This new understanding has the capacity to advance the fundamental understanding of nanoparticles, in particular for multimetallic nanoparticles used widely in manufacturing and energy technology. |