Growth and characterization of barium oxide nanoclusters on YSZ(111)

Journal Article · Thu Aug 13 04:00:00 EDT 2009 · Journal of Physical Chemistry C, 113(32):14324-14328

DOI:https://doi.org/10.1021/jp9020068· OSTI ID:963182

Nachimuthu, Ponnusamy; Kim, Yong Joo; Yu, Zhongqing; Jiang, Weilin; Engelhard, Mark H; Shutthanandan, V; Szanyi, Janos; Thevuthasan, Suntharampillai

Barium oxide (BaO) was grown on YSZ(111) substrate by oxygen-plasma-assisted molecular beam epitaxy (OPA-MBE). In-situ reflection high-energy electron diffraction, ex-situ x-ray diffraction, atomic force microscopy and x-ray photoelectron spectroscopy have confirmed that the BaO grows as clusters on YSZ(111). During and following the growth under UHV conditions, BaO remains in single phase. When exposed to ambient conditions, the clusters transformed to BaCO3 and/or Ba(OH)2 H2O. However, in a few attempts of BaO growth, XRD results show a fairly single phase cubic BaO with a lattice constant of 0.5418(1) nm. XPS results show that exposing BaO clusters to ambient conditions results in the formation BaCO3 on the surface and partly Ba(OH)2 throughout in the bulk. Based on the observations, it is concluded that the BaO nanoclusters grown on YSZ(111) are highly reactive in ambient conditions. The variation in the reactivity of BaO between different attempts of the growth is attributed to the cluster size.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 963182
• Report Number(s): PNNL-SA-65149; 30469; KP1504020
• Journal Information: Journal of Physical Chemistry C, 113(32):14324-14328, Journal Name: Journal of Physical Chemistry C, 113(32):14324-14328 Journal Issue: 32 Vol. 113; ISSN 1932-7447
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ATOMIC FORCE MICROSCOPY
BARIUM OXIDES
ELECTRON DIFFRACTION
Environmental Molecular Sciences Laboratory
MOLECULAR BEAM EPITAXY
REFLECTION
SUBSTRATES
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY