All Publications


  • In-situ observation of plasmon-controlled photocatalytic dehydrogenation of individual palladium nanoparticles NATURE COMMUNICATIONS Vadai, M., Angell, D. K., Hayee, F., Sytwu, K., Dionne, J. A. 2018; 9
  • In-situ observation of plasmon-controlled photocatalytic dehydrogenation of individual palladium nanoparticles. Nature communications Vadai, M., Angell, D. K., Hayee, F., Sytwu, K., Dionne, J. A. 2018; 9 (1): 4658

    Abstract

    Plasmonic nanoparticle catalysts offer improved light absorption and carrier transport compared to traditional photocatalysts. However, it remains unclear how plasmonic excitation affects multi-step reaction kinetics and promotes site-selectivity. Here, we visualize a plasmon-induced reaction at the sub-nanoparticle level in-situ and in real-time. Using an environmental transmission electron microscope combined with light excitation, we study the photocatalytic dehydrogenation of individual palladium nanocubes coupled to gold nanoparticles with sub-2 nanometer spatial resolution. We find that plasmons increase the rate of distinct reaction steps with unique time constants; enable reaction nucleation at specific sites closest to the electromagnetic hot spots; and appear to open a new reaction pathway that is not observed without illumination. These effects are explained by plasmon-mediated population of excited-state hybridized palladium-hydrogen orbitals. Our results help elucidate the role of plasmons in light-driven photochemical transformations, en-route to design of site-selective and product-specific photocatalysts.

    View details for PubMedID 30405133

  • In-situ visualization of plasmon-induced hydrogenation reactions in individual palladium nanocubes Vadai, M., Angell, D., Hayee, F., Sytwu, K., Dionne, J. AMER CHEMICAL SOC. 2018
  • Plasmonic approaches for visualizing and controlling intercalation-driven phase transformations Dionne, J., Hayee, F., Vadai, M., Angell, D., Sytwu, K. AMER CHEMICAL SOC. 2018