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Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation
Published on: August 15, 2019
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Ultrafast relaxation dynamics in bimetallic plasmonic catalysts
Sangwan Sim1, Alyssa Beierle, Philip Mantos
1Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. rpprasan@lanl.gov sanchari.chowdhury@nmt.edu.
Nanoscale
|May 5, 2020
Summary
Adding nickel or platinum to gold nanoparticles enhances electron-phonon coupling for faster energy transfer in plasmon-enhanced catalysis. This research aids in designing efficient bimetallic catalysts for energy reactions.
Area of Science:
- Materials Science
- Nanotechnology
- Catalysis
Background:
- Plasmonic metal nanoparticles, like gold, are crucial for energy-intensive reactions.
- Combining gold with other catalysts (Ni, Pt) can enhance catalytic efficiency.
- Reaction efficiency depends on light absorption and charge carrier dynamics.
Purpose of the Study:
- Investigate charge carrier relaxation dynamics in gold/nickel (Au/Ni) and gold/platinum (Au/Pt) bimetallic nanoparticles.
- Understand how Ni and Pt addition affects gold nanoparticle properties for catalysis.
Main Methods:
- Synthesis and characterization of Au/Ni and Au/Pt bimetallic nanoparticles.
- Analysis of light absorption cross-section and photoexcited charge carrier dynamics.
- Measurement of electron-phonon and phonon-phonon coupling rates.
Main Results:
- Au/Ni and Au/Pt nanoparticles show reduced light absorption compared to pure gold.
- Electron-phonon coupling rates in Au/Ni and Au/Pt are significantly faster than in pure Au.
- Phonon-phonon coupling rates differ in bimetallic nanoparticles due to acoustic impedance mismatch.
Conclusions:
- Ni and Pt enhance electron-phonon coupling in gold nanoparticles due to their intrinsic properties.
- Acoustic impedance mismatch at the interface influences phonon dynamics.
- Findings offer insights for designing advanced bimetallic plasmonic catalysts.
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