anodicaluminiumoxide(AAO)templatehavebeeninvestigated.A50-mm-thickAAOtemplatewas fabricatedbyelectrochemicaltechniques.ThenanotubesweresynthesizedinaCVDquartzhotwall furnaceusingC2H2/N2 mixturesasfeedinggas. I–V measurementshavebeenperformedonsamplesafter the nanotubesgrowth(typeIsamples)andafterapartialAl2O3 removal(typeIIsamples)inorderto obtainsegmentsofnanotubesprotrudingfromthenanopores.Theeffectsoftheconditioningprocess and adsorbatesreleasehavebeeninvestigated.Theemissioncurveshavebeenanalysedinthe frameworkoftheFowler–Nordheimmodel.Forthe b factor enhancement,adifferentdependenceon time hasbeenevidencedfortwotypesofinvestigatedsamplesandhasbeententativelycorrelatedwith materialsmodificationsoccurringundertheHVpolarisation(incaseoftypeIsamples)andwiththe damageinducedbychemicaletching(incaseoftypeIIsamples).Thevaluesofemittedcurrentdensity (up to40mA/cm2) andtheemissionpropertiesindicatethattheproposedpreparationmethodologyis suitablefortherealizationofrobustandefficientCNT-basedfieldemissiondevicesandelectronsources.
Angelucci, A., Boscolo, I., Ciorba, A., Cuffiani, M., Malferrati, L., Montanari, A., et al. (2010). Honeycomb arrays of carbon nanotubes in alumina templates for field emission based devices and electron sources. PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 42, 1469-1476 [10.1016/j.physe.2009.11.119].
Honeycomb arrays of carbon nanotubes in alumina templates for field emission based devices and electron sources
ORLANDUCCI, SILVIA;SESSA, VITO;TERRANOVA PERSICHELLI, MARIA LETIZIA;
2010-01-01
Abstract
anodicaluminiumoxide(AAO)templatehavebeeninvestigated.A50-mm-thickAAOtemplatewas fabricatedbyelectrochemicaltechniques.ThenanotubesweresynthesizedinaCVDquartzhotwall furnaceusingC2H2/N2 mixturesasfeedinggas. I–V measurementshavebeenperformedonsamplesafter the nanotubesgrowth(typeIsamples)andafterapartialAl2O3 removal(typeIIsamples)inorderto obtainsegmentsofnanotubesprotrudingfromthenanopores.Theeffectsoftheconditioningprocess and adsorbatesreleasehavebeeninvestigated.Theemissioncurveshavebeenanalysedinthe frameworkoftheFowler–Nordheimmodel.Forthe b factor enhancement,adifferentdependenceon time hasbeenevidencedfortwotypesofinvestigatedsamplesandhasbeententativelycorrelatedwith materialsmodificationsoccurringundertheHVpolarisation(incaseoftypeIsamples)andwiththe damageinducedbychemicaletching(incaseoftypeIIsamples).Thevaluesofemittedcurrentdensity (up to40mA/cm2) andtheemissionpropertiesindicatethattheproposedpreparationmethodologyis suitablefortherealizationofrobustandefficientCNT-basedfieldemissiondevicesandelectronsources.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
