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Nanoscale Hydrogenography on Single Magnesium Nanoparticles
Florian Sterl1, Heiko Linnenbank1, Tobias Steinle1
14th Physics Institute and Research Center SCoPE , University of Stuttgart , Pfaffenwaldring 57 , 70569 Stuttgart , Germany.
Nano Letters
|June 23, 2018
Summary
Researchers developed nanoscale hydrogenography to visualize hydrogen absorption in magnesium nanoparticles. This reveals how hydrogenation progresses within single nanocrystallites, enabling better active plasmonic devices.
Area of Science:
- Plasmonics
- Materials Science
- Nanotechnology
Background:
- Active plasmonics utilizes materials like magnesium for switchable metasurfaces.
- Hydrogenation of magnesium nanoparticles reversibly switches plasmonic resonances on and off.
- The progression of hydrogenation within individual nanoparticles remained uncharacterized.
Purpose of the Study:
- To introduce and demonstrate nanoscale hydrogenography for visualizing hydrogenation in single magnesium nanodisks.
- To understand the spatially resolved hydrogen absorption process in individual nanoparticles.
- To provide insights for improving active nano-optical switching devices.
Main Methods:
- Integration of near-field scattering microscopy, atomic force microscopy, and single-particle far-field spectroscopy.
- Development of nanoscale hydrogenography for in-situ analysis of hydrogenation.
- Single-nanoparticle tracking during phase transitions.
Main Results:
- Hydrogenation progresses along individual single-crystalline nanocrystallites within Mg nanodisks.
- Spatially resolved monitoring of reversible hydrogenation/dehydrogenation (switching) in individual nanoparticles was achieved.
- Variations and consistencies in the hydrogenation process across different nanoparticles were observed.
Conclusions:
- Nanoscale hydrogenography effectively visualizes hydrogen diffusion in metal nanoparticles.
- Understanding nanoparticle hydrogenation is crucial for developing advanced active plasmonic devices.
- The findings pave the way for optimizing nano-optical switching technologies.
Keywords:
absorptionactive plasmonicsatomic force microscopycrystallinitydark-field spectroscopydesorptiondielectric functionfar-field scatteringhydrogenhydrogenationhydrogenographymagnesiummagnesium hydridenanodisksnanoparticlesoptical near-fieldpalladiumrefractive indexscanning near-field optical microscopy
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