INVESTIGADORES
PONCE Miguel Adolfo
artículos
Título:
Novel CO2 and COgassensorbasedonnanostructuredSm2O3 hollow
Autor/es:
CARLOS R.MICHEL; ALMAH.MARTÍNEZ-PRECIADO; RODRIGO PARRA; CELSO ALDAO; MIGUEL PONCE
Revista:
SENSORS AND ACTUATORS B-CHEMICAL
Editorial:
ELSEVIER SCIENCE SA
Referencias:
Lugar: Amsterdam; Año: 2014 vol. 202 p. 1220 - 1228
ISSN:
0925-4005
Resumen:
Sm2O3 microspheres werepreparedbythecoprecipitationmethod,usingsamariumnitrateandformic acid. Thesizeofthemicrosphereswasintherange1?6 m; however,extensivefragmentationwas observed. Anoutstandingimprovementofthemicrostructurewasachievedbyusinganaqueoussolu- tion ofpectin.Inthiscase,hollowandnanoporousmicrospheres,havinglittlefragmentation,were produced. Theevolutionofthecrystalstructurewithcalcinationtemperaturerevealedtheformation of single-phasecubicSm2O3, at600◦C. Theeffectsofthecalcinationtemperatureandtheconcentration of samariumnitrate,onthemicrostructureofSm2O3, wereinvestigated.Forthegassensingcharacteriza- tion, thickfilmswerepreparedwiththeas-preparedSm2O3 microspheres. Thegassensingperformance of Sm2O3 sensor deviceswasenhancedwhengoldelectrodeswereused.Transientimpedancemeasure- ments revealedareproducibleandreliabledetectionofcarbondioxideandcarbonmonoxideat400 ◦C. The increaseoftheappliedfrequencyproducedstableandnoiselessgraphs.Furthermore,quantitative detection ofthetestgaseswasrevealedbyimpedanceandpolarizationmeasurements. © 2014ElsevierB.V.Allrightsreserved
