Layer-by-Layer Films with CoFe2O4Nanocrystals and Graphene Oxide as a Sensitive Interface in Capacitive Field-Effect Devices
dc.contributor.author | Morais, Paulo V. [UNESP] | |
dc.contributor.author | Orlandi, Marcelo O. [UNESP] | |
dc.contributor.author | Schöning, Michael J. | |
dc.contributor.author | Siqueira, José R. | |
dc.contributor.institution | Federal University of Triângulo Mineiro (UFTM) | |
dc.contributor.institution | Universidade Estadual Paulista (UNESP) | |
dc.contributor.institution | FH Aachen | |
dc.contributor.institution | Forschungszentrum Jülich | |
dc.date.accessioned | 2022-04-28T19:52:54Z | |
dc.date.available | 2022-04-28T19:52:54Z | |
dc.date.issued | 2022-01-01 | |
dc.description.abstract | Sensor 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.affiliation | Laboratory of Applied Nanomaterials and Nanostructures (LANNA) Institute of Exact Sciences Natural and Education Federal University of Triângulo Mineiro (UFTM), MG | |
dc.description.affiliation | Interdisciplinary Laboratory of Electrochemistry and Ceramics Chemistry Institute São Paulo State University, SP | |
dc.description.affiliation | Institute of Nano- and Biotechnologies (INB) FH Aachen Campus Jülich | |
dc.description.affiliation | Institute of Biological Information Processing (IBI-3) Forschungszentrum Jülich | |
dc.description.affiliationUnesp | Interdisciplinary Laboratory of Electrochemistry and Ceramics Chemistry Institute São Paulo State University, SP | |
dc.identifier | http://dx.doi.org/10.1021/acsanm.2c00296 | |
dc.identifier.citation | ACS Applied Nano Materials. | |
dc.identifier.doi | 10.1021/acsanm.2c00296 | |
dc.identifier.issn | 2574-0970 | |
dc.identifier.scopus | 2-s2.0-85127544955 | |
dc.identifier.uri | http://hdl.handle.net/11449/223761 | |
dc.language.iso | eng | |
dc.relation.ispartof | ACS Applied Nano Materials | |
dc.source | Scopus | |
dc.subject | CoFe2O4nanocrystals | |
dc.subject | EIS sensors | |
dc.subject | field-effect devices | |
dc.subject | graphene oxide | |
dc.subject | layer-by-layer technique | |
dc.subject | nanostructured films | |
dc.title | Layer-by-Layer Films with CoFe2O4Nanocrystals and Graphene Oxide as a Sensitive Interface in Capacitive Field-Effect Devices | en |
dc.type | Artigo | |
unesp.author.orcid | 0000-0003-4347-6685 0000-0003-4347-6685[3] | |
unesp.author.orcid | 0000-0001-9121-3076[4] |