Publications by authors named "Hui-Shu Feng"
Metallic nanostructures exhibit superior catalytic performance for diverse chemical reactions and the in-depth understanding of reaction mechanisms requires versatile characterization methods. Plasmon-enhanced Raman spectroscopy (PERS), including surface-enhanced Raman spectroscopy (SERS), shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS), and tip-enhanced Raman spectroscopy (TERS), appears as a powerful technique to characterize the Raman fingerprint information of surface species with high chemical sensitivity and spatial resolution. To expand the range of catalytic reactions studied by PERS, catalytically active metals are integrated with plasmonic metals to produce bifunctional metallic nanostructures.
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- Active oxygen species (AOS) are crucial in catalytic reactions for clean energy, but identifying their active sites and imaging their surface properties is challenging, especially on complex catalysts.
- Utilizing tip-enhanced Raman spectroscopy (TERS), researchers investigated the generation and movement of OH radicals on a Pd/Au(111) bimetallic catalyst, finding that OH radicals are effectively produced on the Pd surface, with higher activity at the Pd step edge compared to the terrace.
- The study highlights that these generated OH radicals can diffuse across the surface to initiate oxidative reactions, with a measured diffusion length of approximately 5.4 nm, providing insights into the active sites and diffusion behaviors of AOS in catalytic processes.