skip to main content
Idioma:

Graphene Electromechanical Water Sensor: The Wetristor

Meireles, Leonel M. ; Neto, Eliel G. S. ; Ferrari, Gustavo A. ; Neves, Paulo A. A. ; Gadelha, Andreij C. ; Silvestre, Ive ; Taniguchi, Takashi ; Watanabe, Kenji ; Chacham, Helio ; Neves, Bernardo R. A. ; Campos, Leonardo C. ; Lacerda, Rodrigo G.

Advanced electronic materials, 2020-02, Vol.6 (2), p.n/a [Periódico revisado por pares]

Texto completo disponível

Citações Citado por
  • Título:
    Graphene Electromechanical Water Sensor: The Wetristor
  • Autor: Meireles, Leonel M. ; Neto, Eliel G. S. ; Ferrari, Gustavo A. ; Neves, Paulo A. A. ; Gadelha, Andreij C. ; Silvestre, Ive ; Taniguchi, Takashi ; Watanabe, Kenji ; Chacham, Helio ; Neves, Bernardo R. A. ; Campos, Leonardo C. ; Lacerda, Rodrigo G.
  • Assuntos: carrier mobility ; electronic transport ; graphene ; liquid interfaces ; membranes
  • É parte de: Advanced electronic materials, 2020-02, Vol.6 (2), p.n/a
  • Descrição: A 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. It is demonstrated that a suspended graphene membrane atop a microfluidic channel has a sharp and significant resistivity variation upon water injection in the channel. Besides the scientifically interesting electromechanical effects behind it, such behavior also opens a new applicability window for graphene systems: wetting sensors for microfluidics, a wetristor.
  • Idioma: Inglês
Voltar para lista de resultados
Ir para página anteriorAnterior Resultado  4 AvançarIr para próxima página

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.