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PONCE Miguel Adolfo
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artículos
Título:
Sol–gel synthesis of mesoporous CaCu3Ti4O12 thin films and their gas sensing response
Autor/es:
R. PARRA, R.SAVU, L.A. RAMAJO, M.A. PONCE, J.A. VARELA, M.S. CASTRO, P.R. BUENO, E. JOANNI
Revista:
JOURNAL OF SOLID STATE CHEMISTRY
Editorial:
ACADEMIC PRESS INC ELSEVIER SCIENCE
Referencias:
Lugar: Amsterdan; Año: 2010 vol. 183 p. 1209 - 1214
ISSN:
0022-4596
Resumen:
A newsol–gelsynthesisprocedureofstablecalciumcoppertitanate(CaCu3Ti4O12—CCTO)precursor sols forthefabricationofporousfilmswasdeveloped.Thecompositionofthesolwasselectedinorder to avoidtheprecipitationofundesiredphases;ethanolwasusedassolvent,aceticacidasmodifierand poly(ethyleneglycol)asalinkeragent.Filmsdepositedbyspin-coatingontooxidizedsiliconsubstrates were annealedat700 1C. Themainphasepresentinthesamples,asdetectedbyX-raydiffractionand Ramanspectroscopy,wasCaCu3Ti4O12. Scanningelectronmicroscopyanalysisshowedthatmesoporous structures,withthicknessesbetween200and400nm,weredevelopedasaresultoftheprocessing conditions.Thefilmsweretestedregardingtheirsensibilitytowardsoxygenandnitrogenat atmosphericpressureusingworkingtemperaturesfrom200to290 1C. Thesamplesexhibitedn-type conductivity,highsensitivityandshortresponsetimes.ThesecharacteristicsindicatethatCCTO mesoporousstructuresobtainedbysol–gelaresuitableforapplicationingassensing. 3Ti4O12—CCTO)precursor sols forthefabricationofporousfilmswasdeveloped.Thecompositionofthesolwasselectedinorder to avoidtheprecipitationofundesiredphases;ethanolwasusedassolvent,aceticacidasmodifierand poly(ethyleneglycol)asalinkeragent.Filmsdepositedbyspin-coatingontooxidizedsiliconsubstrates were annealedat700 1C. Themainphasepresentinthesamples,asdetectedbyX-raydiffractionand Ramanspectroscopy,wasCaCu3Ti4O12. Scanningelectronmicroscopyanalysisshowedthatmesoporous structures,withthicknessesbetween200and400nm,weredevelopedasaresultoftheprocessing conditions.Thefilmsweretestedregardingtheirsensibilitytowardsoxygenandnitrogenat atmosphericpressureusingworkingtemperaturesfrom200to290 1C. Thesamplesexhibitedn-type conductivity,highsensitivityandshortresponsetimes.ThesecharacteristicsindicatethatCCTO mesoporousstructuresobtainedbysol–gelaresuitableforapplicationingassensing. & 2010ElsevierInc.Allrightsreserved
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