Nanoscale Hydrogenography on Single Magnesium Nanoparticles
Version 3 2018-07-18, 18:46
Version 2 2018-06-29, 17:34
Version 1 2018-06-28, 13:25
Posted on 2018-07-18 - 18:46
Active
plasmonics is enabling novel devices such as switchable
metasurfaces for active beam steering or dynamic holography. Magnesium
with its particle plasmon resonances in the visible spectral range
is an ideal material for this technology. Upon hydrogenation, metallic
magnesium switches reversibly into dielectric magnesium hydride (MgH2), turning the plasmonic resonances off and on. However, up
until now, it has been unknown how exactly the hydrogenation process
progresses in the individual plasmonic nanoparticles. Here, we introduce
a new method, namely nanoscale hydrogenography, that combines near-field
scattering microscopy, atomic force microscopy, and single-particle
far-field spectroscopy to visualize the hydrogen absorption process
in single Mg nanodisks. Using this method, we reveal that hydrogen
progresses along individual single-crystalline nanocrystallites within
the nanostructure. We are able to monitor the spatially resolved forward
and backward switching of the phase transitions of several individual
nanoparticles, demonstrating differences and similarities of that
process. Our method lays the foundations for gaining a better understanding
of hydrogen diffusion in metal nanoparticles and for improving future
active nano-optical switching devices.
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Sterl, Florian; Linnenbank, Heiko; Steinle, Tobias; Mörz, Florian; Strohfeldt, Nikolai; Giessen, Harald (2018). Nanoscale Hydrogenography on Single Magnesium Nanoparticles. ACS Publications. Collection. https://doi.org/10.1021/acs.nanolett.8b01277
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AUTHORS (6)
FS
Florian Sterl
HL
Heiko Linnenbank
TS
Tobias Steinle
FM
Florian Mörz
NS
Nikolai Strohfeldt
HG
Harald Giessen
KEYWORDS
Nanoscale Hydrogenographyhydrogen diffusionsingle-particle far-field spectroscopyplasmonic nanoparticlesparticle plasmon resonancesSingle Magnesium Nanoparticlesforce microscopymethodphase transitionsnovel deviceshydrogen absorption processswitchable metasurfacesdielectric magnesium hydridenanoscale hydrogenographysingle-crystalline nanocrystalliteshydrogenation processmetal nanoparticlesMg nanodisksplasmonic resonancesbeam steeringmagnesium switches reversibly