Graphene electromechanical water sensor: the wetristor

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dc.creatorLeonel Muniz Meireles
dc.creatorBernardo Ruegger Almeida Neves
dc.creatorLeonardo Cristiano Campos
dc.creatorRodrigo Gribel Lacerda
dc.creatorEliel Gomes da Silva Neto
dc.creatorGustavo Arrighi Ferrari
dc.creatorPaulo A. A. Neves
dc.creatorAndreij de Carvalho Gadelha
dc.creatorIve Silvestre de Almeida
dc.creatorTakashi Taniguchi
dc.creatorKenji Watanabe
dc.creatorHelio Chacham
dc.date.accessioned2024-02-19T15:24:01Z
dc.date.accessioned2025-09-09T01:33:32Z
dc.date.available2024-02-19T15:24:01Z
dc.date.issued2019
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.description.sponsorshipINCT – Instituto nacional de ciência e tecnologia (Antigo Instituto do Milênio)
dc.identifier.doihttps://doi.org/10.1002/aelm.201901167
dc.identifier.issn2199-160X
dc.identifier.urihttps://hdl.handle.net/1843/64200
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofAdvanced Functional Materials
dc.rightsAcesso Restrito
dc.subjectGrafeno
dc.subject.otherGraphene on boron nitride
dc.subject.otherSuspended graphene
dc.subject.otherElectromechanical
dc.subject.otherWetristor
dc.titleGraphene electromechanical water sensor: the wetristor
dc.typeArtigo de periódico
local.citation.epage6
local.citation.issue2
local.citation.spage1
local.citation.volume6
local.description.resumoA water-induced electromechanical response in suspended graphene atop a microfluidic channel is reported. The graphene membrane resistivity rapidly decreases to ≈25% upon water injection into the channel, defining a sensitive “channel wetting” device—a wetristor. The physical mechanism of the wetristor operation is investigated using two graphene membrane geometries, either uncovered or covered by an inert and rigid lid (hexagonal boron nitride multilayer or poly(methyl methacrylate) film). The wetristor effect, namely the water-induced resistivity collapse, occurs in uncovered devices only. Atomic force microscopy and Raman spectroscopy indicate substantial morphology changes of graphene membranes in such devices, while covered membranes suffer no changes, upon channel water filling. The results suggest an electromechanical nature for the wetristor effect, where the resistivity reduction is caused by unwrinkling of the graphene membrane through channel filling, with an eventual direct doping caused by water being of much smaller magnitude, if any. The wetristor device should find useful sensing applications in general micro- and nanofluidics.
local.identifier.orcidhttps://orcid.org/0000-0001-6550-7804
local.identifier.orcidhttps://orcid.org/0000-0003-0464-4754
local.identifier.orcidhttps://orcid.org/0000-0001-6792-7554
local.identifier.orcidhttps://orcid.org/0000-0003-4777-7370
local.identifier.orcidhttps://orcid.org/0000-0002-4658-3243
local.identifier.orcidhttps://orcid.org/0000-0002-0824-5622
local.identifier.orcidhttps://orcid.org/0000-0002-6350-7680
local.identifier.orcidhttps://orcid.org/0000-0002-1467-3105
local.identifier.orcidhttps://orcid.org/0000-0003-3701-8119
local.identifier.orcidhttps://orcid.org/0000-0001-5041-9094
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://onlinelibrary.wiley.com/doi/full/10.1002/aelm.201901167

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