What is it about?

Controlling the composition and plasmonic nanoparticles is crucial to improve the efficiency of chemical reactions by photocatalysis. Using highly surface-sensitive optical spectroscopy and scanning probe microscopy, supported by theoretical modeling, we reveal in real time how nanoparticle composition and optical response can be reversibly altered by CO adsorption. carbon and annealing of samples.

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Why is it important?

By using a model surface template, core-shell palladium-gold nanoparticle growth is self-organizing, allowing to scrutize the impact of their size and composition on their geometry and plasmonic response. We evidence nanoparticle surface composition changes upon carbon monoxyde (CO) adsorption, by nonlinear vibrational spectroscopy and UV/vis reflectance spectroscopy. CO induces Pd migration to the Au shell, forming a PdAu alloy and reducing the plasmonic response. Annealing the nanoparticle at 550 K allows the CO to be desorbed and the Pd to migrate towards the core, leading to the recovery of the initial core-shell structure and a stronger plasmonic response.

Perspectives

Controlling the surface composition of plasmonic catalysts using molecular adsorption and sample temperature would be the way to adjust their response to a specific reaction and improve their efficiency.

Aimeric Ouvrard

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This page is a summary of: Change of composition and surface plasmon resonance of Pd/Au core/shell nanoparticles triggered by CO adsorption, The Journal of Chemical Physics, September 2024, American Institute of Physics,
DOI: 10.1063/5.0231175.
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