物理
化学
化学工程
催化作用
原子物理学
纳米技术
光化学
分子物理学
作者
Katherine Sytwu,Michal Vadai,Fariah Hayee,Daniel K. Angell,Alan Dai,Jefferson Dixon,Jennifer A. Dionne
出处
期刊:arXiv: Applied Physics
日期:2020-09-10
被引量:7
标识
DOI:10.1126/science.abd2847
摘要
Nanoparticle surface structure and geometry generally dictate where chemical transformations occur, with the low-coordination-number, high-radius-of-curvature sites being energetically-preferred. Here, we show how optical excitation of plasmons enables spatially-controlled chemical transformations, including access to sites which, without illumination, would be energetically-unfavorable. We design a crossed-bar Au-PdHx antenna-reactor system that localizes electromagnetic enhancement away from the innately reactive PdHx nanorod tips. Using optically-coupled in situ environmental transmission electron microscopy, we track the dehydrogenation of individual antenna-reactor pairs with varying optical illumination intensity, wavelength, and hydrogen pressure. Our in situ experiments show that plasmons enable new catalytic sites, including hydrogenation dissociation at the nanorod faces. Molecular dynamics simulations confirm that these new nucleation sites are energetically unfavorable in equilibrium and only accessible via tailored plasmonic excitation.
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