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|Title:||ALS-CXRO Seminar | Geoff Thornton (UCL)|
|When:||06/ 6/2012 3:00 PM - 4:00 PM|
|Description:||ALS-CXRO Seminar Series|
Wed, June 6, 2012
University College London
Pd nanoparticles for interconnects and catalyst mimics
Directed self-assembling nanostructures offer considerable potential for nanoscale electronics, in particular quasi-1D wires supported on a dielectric support. The inclusion of a wide band gap support is key as this ensures that conducting nanostructures are electrically isolated from the substrate. In this work Palladium nanoparticles supported on rutile TiO2(110) have been studied using the complementary techniques of STM and XPEEM. Two distinct types of palladium nanoparticles are observed, namely long nanowires up to 1000 nm long, and smaller dot-like features with diameters ranging from 80-160 nm. X-ray photoemission electron microscopy reveals that the nanoparticles are composed of metallic palladium, separated by the bare TiO2(110) surface. While the nanowires have application as interconnects, the dot-like structures act as mimics for supported particles in catalysis. Here there is an interest in the interaction between adsorbate domain walls that are not present on single crystal surfaces. Using CO as a model adsorbate, we find domain formation on Pd(111) facets that is not observed on the single crystal as well as fluxional behavior of the domains.