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@ARTICLE{Boothroyd:187279,
author = {Boothroyd, Christopher Brian and Moreno, M. S. and Duchamp,
Martial and Kovacs, Andras and Monge, N. and Morales, G. M.
and Barbero, C. A. and Dunin-Borkowski, Rafal},
title = {{A}tomic resolution imaging and spectroscopy of barium
atoms and functional groups on graphene oxide},
journal = {Ultramicroscopy},
volume = {145},
issn = {0304-3991},
address = {Amsterdam},
publisher = {Elsevier Science},
reportid = {FZJ-2015-00952},
pages = {66-73},
year = {2014},
abstract = {We present an atomic resolution transmission electron
microscopy (TEM) and scanning TEM (STEM) study of the local
structure and composition of graphene oxide modified with
Ba2+. In our experiments, which are carried out at 80 kV,
the acquisition of contamination-free high-resolution STEM
images is only possible while heating the sample above 400
°C using a highly stable heating holder. Ba atoms are
identified spectroscopically in electron energy-loss
spectrum images taken at 800 °C and are associated with
bright contrast in high-angle annular dark-field STEM
images. The spectrum images also show that Ca and O occur
together and that Ba is not associated with a significant
concentration of O. The electron dose used for spectrum
imaging results in beam damage to the specimen, even at
elevated temperature. It is also possible to identify Ba
atoms in high-resolution TEM images acquired using shorter
exposure times at room temperature, thereby allowing the
structure of graphene oxide to be studied using
complementary TEM and STEM techniques over a wide range of
temperatures.},
cin = {PGI-5},
ddc = {570},
cid = {I:(DE-Juel1)PGI-5-20110106},
pnm = {42G - Peter Grünberg-Centre (PG-C) (POF2-42G41)},
pid = {G:(DE-HGF)POF2-42G41},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000340838100009},
doi = {10.1016/j.ultramic.2014.03.004},
url = {https://juser.fz-juelich.de/record/187279},
}