INVESTIGADORES
SCHIPANI federico
artículos
Título:
Electrical behavior of cerium dioxide films exposed to different gases atmospheres
Autor/es:
R. C. DEUS; R. A. C. AMORESI; P. M. DESIMONE; F. SCHIPANI; L. S. R. ROCHA; M. A. PONCE; A. Z. SIMOES; E. LONGO
Revista:
CERAMICS INTERNATIONAL
Editorial:
ELSEVIER SCI LTD
Referencias:
Lugar: Amsterdam; Año: 2016 vol. 42 p. 15023 - 15029
ISSN:
0272-8842
Resumen:
Here wepresentaneasy-reproduciblemicrowave-assistedhydrothermalrouteforpreparingpurena-nocrystalline CeO2 films. Theproducedmaterialswerecharacterizedusingawiderangeoftechniques(X-raydiffraction, field emissiongunscanningelectronmicroscopy,Ramanspectroscopy)tounderstandthe synthesisdependentchangesincrystallographicstructure,andcrystallitesize.RamanandX-raydiffraction techniquesrevealedthatthe films werefreeofsecondaryphasesandthattheycrystallizeinthe cubicstructure.Theobservedhydrodynamicparticlesizelargerthanthecrystallitesizeconfirms theaggregation phenomenon.Gassensingmeasurementshavebeencarriedouttorationalizethetypeandnumber ofsurfaceadsorbedgroupsandoverallnanostructure.Electricalconductancevariations,owingto gasesadsorptionontosemiconductoroxide films surfaces,wereobservedinthiswork.ChemiresistiveCeO2 film propertiesdependontheintergranularbarrierheightsandwidth.
