Graphene electromechanical water sensor : the Wetristor.

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dc.contributor.authorMeireles, Leonel Muniz
dc.contributor.authorSilva Neto, Eliel Gomes da
dc.contributor.authorFerrari, Gustavo Arrighi
dc.contributor.authorNeves, Paulo A. A.
dc.contributor.authorGadelha, Andreij de Carvalho
dc.contributor.authorAlmeida, Ive Silvestre de
dc.contributor.authorTaniguchi, Takashi
dc.contributor.authorWatanabe, Kenji
dc.contributor.authorChacham, Helio
dc.contributor.authorNeves, Bernardo Ruegger Almeida
dc.contributor.authorCampos, Leonardo Cristian
dc.contributor.authorLacerda, Rodrigo Gribel
dc.date.accessioned2023-01-26T19:52:14Z
dc.date.available2023-01-26T19:52:14Z
dc.date.issued2019pt_BR
dc.description.abstractA 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 sensi-tive “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.pt_BR
dc.identifier.citationMEIRELES, L. M. et al. Graphene electromechanical water sensor: the Wetristor. Advanced Electronic Materials, v. 6, n. 2, artigo 1901167, 2019. Disponível em: <https://onlinelibrary.wiley.com/doi/abs/10.1002/aelm.201901167>. Acesso em: 06 jul. 2022.pt_BR
dc.identifier.doihttps://doi.org/10.1002/aelm.201901167pt_BR
dc.identifier.issn2199-160X
dc.identifier.urihttp://www.repositorio.ufop.br/jspui/handle/123456789/16062
dc.identifier.uri2https://onlinelibrary.wiley.com/doi/abs/10.1002/aelm.201901167pt_BR
dc.language.isoen_USpt_BR
dc.rightsrestritopt_BR
dc.titleGraphene electromechanical water sensor : the Wetristor.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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