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academies
Materials Science and Nanotechnology | Volume 2
May 21-22, 2018 | New York, USA
International Conference on
Nanoscience & Technology
S
everal terms of the homologous series Zn
k
In2O
k
+
3
(3 ≤ k ≤
13) have been synthesized following solid-state reactions
with an exhaustive control of the synthesis parameters. The
structure consists of alternated layers of InO
2
- octahedral
and wurtzite-like InZn
k
O
k
+
1
+ blocks stacked perpendicular
to the c-axis of the crystal, where zinc and indium occupy
tetrahedral and trigonal bipyramid sites. Moreover, the zone
axis show a gradual shift of the oxygen position in order
to keep the polarization neutrality along c axis and allow
the formation and stabilization of the structure, while no
differences of the indium distribution inside the wurtzite
blocks is visualized). On the other hand, images fromzone axis
show the characteristic nanostructured zig-zag modulation
of this homologous series. Electron energy loss spectroscopy
(EELS) confirms the preference site of In3+ along this zig
zag pattern. Cathodoluminescence measurements reveal a
main emission band centered at 1.75 eV, which shows an
increasing of intensity with k, and has been attributed to the
existence of zinc vacancies. For this reason, the combined
study of structural aspects and physical properties of these
oxides, as addressed in this work, is necessary for a proper
discussion of the results.
Speaker Biography
Julio Ramirez-Castellanos works in the synthesis and structural/microstructural
characterizations of new functional inorganic materials by high-resolution electron
microscopy. Currently, he is professor at Complutense University, Madrid. He is co-
author of more than 100 reviewed scientific publications, 4 invention patents, and
more than 100 communications to international conferences.
e:
jrcastel@quim.ucm.esNanostructure of luminescent
Zn
k
In2O
k
+
3
materials
Julio Ramírez-Castellanos
Universidad Complutense Madrid, Spain