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Layer-by-Layer Films with CoFe2O4Nanocrystals and Graphene Oxide as a Sensitive Interface in Capacitive Field-Effect Devices

dc.contributor.authorMorais, Paulo V. [UNESP]
dc.contributor.authorOrlandi, Marcelo O. [UNESP]
dc.contributor.authorSchöning, Michael J.
dc.contributor.authorSiqueira, José R.
dc.contributor.institutionFederal University of Triângulo Mineiro (UFTM)
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionFH Aachen
dc.contributor.institutionForschungszentrum Jülich
dc.date.accessioned2022-04-28T19:52:54Z
dc.date.available2022-04-28T19:52:54Z
dc.date.issued2022-01-01
dc.description.abstractSensor devices have proved to be a promising technology for portable microelectronic systems for biomedical and environmental applications. Depending on the target analyte and/or the sensor platform chosen, the study of (nano)materials and their ideal incorporation in the device as a receptor layer have great importance for developing sensing units with enhanced properties and performance. Here, we employed the layer-by-layer (LbL) technique to fabricate nanostructured films as sensing units for detecting H2O2 and heavy metal ions (Cd2+ and Cu2+). The LbL film was deposited on electrolyte-insulator-semiconductor (EIS) field-effect devices, combining CoFe2O4 nanocrystals embedded into polyallylamine hydrochloride (PAH) and graphene oxide (GO) as a PAH-CoFe2O4/GO structure. Scanning electron microscopy revealed a LbL film morphology with high surface area presenting heterogeneous clusters of nanocrystals covered by a homogeneous coating of GO. The electrochemical characterization to monitor the film growth and the sensing properties for detecting H2O2 and Cd2+ and Cu2+ ions was carried out by capacitance-voltage (C/V) and constant-capacitance (ConCap) measurements. The results demonstrated catalytic features in detection experiments for an optimized EIS-LbL sensor containing a 6-bilayer PAH-CoFe2O4/GO LbL film. This sensor system was sensitive for all analytes and exhibited a low limit of detection of ca. 314.3 µM for H2O2 and 0.54 and 0.47 µM for Cd2+ and Cu2+ ions, respectively. These findings prove the relevance of incorporating nanostructured films as a receptor layer to enhance sensing properties and may envisage a proof-of-concept field-effect sensor system for environmental applications.en
dc.description.affiliationLaboratory of Applied Nanomaterials and Nanostructures (LANNA) Institute of Exact Sciences Natural and Education Federal University of Triângulo Mineiro (UFTM), MG
dc.description.affiliationInterdisciplinary Laboratory of Electrochemistry and Ceramics Chemistry Institute São Paulo State University, SP
dc.description.affiliationInstitute of Nano- and Biotechnologies (INB) FH Aachen Campus Jülich
dc.description.affiliationInstitute of Biological Information Processing (IBI-3) Forschungszentrum Jülich
dc.description.affiliationUnespInterdisciplinary Laboratory of Electrochemistry and Ceramics Chemistry Institute São Paulo State University, SP
dc.identifierhttp://dx.doi.org/10.1021/acsanm.2c00296
dc.identifier.citationACS Applied Nano Materials.
dc.identifier.doi10.1021/acsanm.2c00296
dc.identifier.issn2574-0970
dc.identifier.scopus2-s2.0-85127544955
dc.identifier.urihttp://hdl.handle.net/11449/223761
dc.language.isoeng
dc.relation.ispartofACS Applied Nano Materials
dc.sourceScopus
dc.subjectCoFe2O4nanocrystals
dc.subjectEIS sensors
dc.subjectfield-effect devices
dc.subjectgraphene oxide
dc.subjectlayer-by-layer technique
dc.subjectnanostructured films
dc.titleLayer-by-Layer Films with CoFe2O4Nanocrystals and Graphene Oxide as a Sensitive Interface in Capacitive Field-Effect Devicesen
dc.typeArtigo
unesp.author.orcid0000-0003-4347-6685 0000-0003-4347-6685[3]
unesp.author.orcid0000-0001-9121-3076[4]

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