skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Ultrashort XUV pulse absorption spectroscopy of partially oxidized cobalt nanoparticles

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/5.0004582· OSTI ID:1642687

High-order harmonic generation (HHG) based transient extreme ultraviolet (XUV) absorption spectroscopy is an emerging technique to trace photoinduced charge carrier dynamics in condensed phase materials with femtosecond and even attosecond temporal resolution and elemental specificity. However, its application to nanoparticulate samples that are relevant, for example, for novel photocatalytic light harvesting concepts, has been limited. This is in part due to the challenge to produce residual-free samples on ultrathin, XUV-transparent substrates as well as a widespread understanding that sparsely distributed nanoparticles do not provide sufficient contrast for XUV absorption measurements. Here, we present static XUV absorption spectra of partially oxidized Co nanowire-structures with diameters of approximately 4.5 nm and lengths between 10 and 40 nm, recorded with an ultrashort pulse HHG light source. Nanoparticles are synthesized by the agglomeration of Co atoms inside superfluid helium droplets, followed by surface deposition and oxidation in ambient air. The method is uniquely suited for residual-free synthesis of transition metal nanowires and their deposition on ultrathin substrates. Analysis by high-resolution transmission electron microscopy reveals the formation of CoO nanowires with regions of unoxidized Co in their interior. The nanoparticle samples are investigated in an HHG-driven ultrafast XUV absorption setup. Despite the low surface coverage of only 23%, the recorded spectrum exhibits a distinct absorption feature at the Co M2,3(2p) edge near 60 eV with a peak height of about 40 mOD. Finally, the results support the feasibility of table-top ultrafast transient XUV absorption studies of photoinduced dynamics in transition metal oxide nanoparticles with sub-monolayer surface coverage.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES), Chemical Sciences, Geosciences & Biosciences Division; Australian Sience Fund (FWF)
Grant/Contract Number:
AC02-05CH11231; P30940-N36; AC02- 05CH11231
OSTI ID:
1642687
Alternate ID(s):
OSTI ID: 1617995
Journal Information:
Journal of Applied Physics, Vol. 127, Issue 18; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

References (49)

Solar-Powered Plasmon-Enhanced Heterogeneous Catalysis journal January 2016
Effects of the Core Location on the Structural Stability of Ni–Au Core–Shell Nanoparticles journal July 2019
Transient absorption spectroscopy using high harmonic generation: a review of ultrafast X-ray dynamics in molecules and solids
  • Geneaux, Romain; Marroux, Hugo J. B.; Guggenmos, Alexander
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 377, Issue 2145 https://doi.org/10.1098/rsta.2017.0463
journal April 2019
Thermally induced breakup of metallic nanowires: experiment and theory journal January 2017
High resolution electron microscopy of Ag-clusters in crystalline and non-crystalline morphologies grown inside superfluid helium nanodroplets journal June 2013
The impact of doping rates on the morphologies of silver and gold nanowires grown in helium nanodroplets journal January 2016
Time-resolved observations of water oxidation intermediates on a cobalt oxide nanoparticle catalyst journal February 2014
Exchange biasing and magnetic properties of partially and fully oxidized colloidal cobalt nanoparticles journal August 2005
Shapes and vorticities of superfluid helium nanodroplets journal August 2014
Characteristic transport properties of CoO-coated monodispersive Co cluster assemblies journal July 1999
Femtosecond M 2,3 -Edge Spectroscopy of Transition-Metal Oxides: Photoinduced Oxidation State Change in α-Fe 2 O 3 journal October 2013
Formation of bimetallic core-shell nanowires along vortices in superfluid He nanodroplets journal October 2014
The characterization of Co-nanoparticles supported on graphene journal January 2015
Tracking Ultrafast Bond Dissociation Dynamics at 0.1 Å Resolution by Femtosecond Extreme Ultraviolet Absorption Spectroscopy journal September 2018
Nonmetal to Metal Transition and Ultrafast Charge Carrier Dynamics of Zn Clusters on p-Si(100) by fs-XUV Photoemission Spectroscopy journal June 2018
Synthesis and Magnetic Properties of CoO Nanoparticles journal May 2005
Size matters: why nanomaterials are different journal January 2006
Imaging Quantum Vortices in Superfluid Helium Droplets journal June 2019
Strong-field induced XUV transmission and multiplet splitting in 4 d −1 6 p core-excited Xe studied by femtosecond XUV transient absorption spectroscopy journal December 2012
Photoabsorption of Ag N ( N 6 6000 ) Nanoclusters Formed in Helium Droplets: Transition from Compact to Multicenter Aggregation journal June 2011
The recent development of efficient Earth-abundant transition-metal nanocatalysts journal January 2017
Plasmon-induced hot carrier science and technology journal January 2015
Electronic and magnetic structure of bulk cobalt: The α, β, and ε-phases from density functional theory calculations
  • de la Peña O’Shea, Víctor Antonio; Moreira, Iberio de P. R.; Roldán, Alberto
  • The Journal of Chemical Physics, Vol. 133, Issue 2 https://doi.org/10.1063/1.3458691
journal July 2010
Helium droplets: a new route to nanoparticles journal January 2013
Efficient solar water-splitting using a nanocrystalline CoO photocatalyst journal December 2013
Surface Deposition and Imaging of Large Ag Clusters Formed in He Droplets journal June 2011
The ultrafast X-ray spectroscopic revolution in chemical dynamics journal May 2018
On the passivation of iron particles at the nanoscale journal January 2019
In Situ Study of Room-Temperature Oxidation Kinetics of Colloidal Co Nanocrystals Investigated by Faraday Rotation Measurement journal December 2010
Light-wave dynamic control of magnetism journal June 2019
Plasmon-induced hot-electron generation at nanoparticle/metal-oxide interfaces for photovoltaic and photocatalytic devices journal January 2014
Molecular dynamics simulation of the deposition process of cold Ag-clusters under different landing conditions journal January 2014
Thermal instabilities and Rayleigh breakup of ultrathin silver nanowires grown in helium nanodroplets journal January 2015
X-Ray Interactions: Photoabsorption, Scattering, Transmission, and Reflection at E = 50-30,000 eV, Z = 1-92 journal July 1993
Stability of Core–Shell Nanoparticles for Catalysis at Elevated Temperatures: Structural Inversion in the Ni–Au System Observed at Atomic Resolution journal January 2018
Fiji: an open-source platform for biological-image analysis journal June 2012
Hcp cobalt nanocrystals with high magnetic anisotropy prepared by easy one-pot synthesis journal January 2016
The Oxidation of Cobalt Nanoparticles into Kirkendall-Hollowed CoO and Co 3 O 4 : The Diffusion Mechanisms and Atomic Structural Transformations journal June 2013
Characterization of Photo-Induced Charge Transfer and Hot Carrier Relaxation Pathways in Spinel Cobalt Oxide (Co 3 O 4 ) journal September 2014
Sizes of large He droplets journal October 2011
Supported Cobalt Oxide Nanoparticles As Catalyst for Aerobic Oxidation of Alcohols in Liquid Phase journal February 2011
Superfluid Helium Droplets: A Uniquely Cold Nanomatrix for Molecules and Molecular Complexes journal May 2004
Ultra-thin h-BN substrates for nanoscale plasmon spectroscopy journal January 2019
Traces of Vortices in Superfluid Helium Droplets journal April 2012
Synthesis of nanoparticles in helium droplets—A characterization comparing mass-spectra and electron microscopy data journal October 2015
Charge Carrier Dynamics of Photoexcited Co 3 O 4 in Methanol: Extending High Harmonic Transient Absorption Spectroscopy to Liquid Environments journal September 2014
Probing ultrafast C–Br bond fission in the UV photochemistry of bromoform with core-to-valence transient absorption spectroscopy journal September 2019
Preparation of Ultrathin Nanowires Using Superfluid Helium Droplets journal April 2014
Mesoporous Co 3 O 4 and Au/Co 3 O 4 Catalysts for Low-Temperature Oxidation of Trace Ethylene journal March 2010