Nasir, S.; Ali, M.; Ramirez Hoyos, P.; Gómez Lozano, V.; Oschmann, B.; Muench, F.; Tahir, MN.... (2014). Fabrication of Single Cylindrical Au-Coated Nanopores with Non-Homogeneous Fixed Charge Distribution Exhibiting High Current Rectifications. ACS Applied Materials and Interfaces. 6(15):12486-12494. https://doi.org/10.1021/am502419j
Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10251/58369
Título:
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Fabrication of Single Cylindrical Au-Coated Nanopores with Non-Homogeneous Fixed Charge Distribution Exhibiting High Current Rectifications
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Autor:
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Nasir, Saima
Ali, Mubarak
Ramirez Hoyos, Patricio
Gómez Lozano, Vicente
Oschmann, Bernd
Muench, Falk
Tahir, Muhammad Nawaz
Zentel, Rudolf
Mafe, Salvador
Ensinger, Wolfgang
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Entidad UPV:
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Universitat Politècnica de València. Departamento de Física Aplicada - Departament de Física Aplicada
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Fecha difusión:
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Resumen:
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We have designed and characterized a cylindrical nanopore that exhibits high electrochemical
current rectification ratios at low and intermediate electrolyte concentrations. For this
purpose, the track-etched single ...[+]
We have designed and characterized a cylindrical nanopore that exhibits high electrochemical
current rectification ratios at low and intermediate electrolyte concentrations. For this
purpose, the track-etched single cylindrical nanopore in polymer membrane is coated with a
gold (Au) layer via electroless plating technique. Then, a non-homogeneous fixed charge
distribution inside the Au-coated nanopore is obtained by incorporating thiol-terminated
uncharged poly(N-isopropylacrylamide) (PNIPAM) chains in series to poly(4-vinyl pyridine)
(PVP) chains, which are positively charged at acidic pH values. The functionalization reaction
is checked by measuring the current–voltage (I–V) curves prior to and after the chemisorption
of polymer chains. The experimental nanopore characterization includes the effects of
temperature, adsorption of chloride ions, electrolyte concentration, and pH of the external
solutions. The results obtained are further explained in terms of a theoretical continuous
model. The combination of well-established chemical procedures (thiol and SAM formation
chemistry, electroless plating, ion track etching) and physical models (two-region pore and
Nernst-Planck equations) permits to obtain a new nanopore with high current rectification
ratios. The single pore could be scaled up to multipore membranes of potential interest for pH
sensing and chemical actuators.
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Palabras clave:
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Synthetic nanopores
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Chemical functionalization
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Stimuli-responsive polymers
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Current rectification
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Electroless gold plating
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Nernst−Planck equations
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Derechos de uso:
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Cerrado |
Fuente:
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ACS Applied Materials and Interfaces. (issn:
1944-8244
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DOI:
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10.1021/am502419j
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Editorial:
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American Chemical Society
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Versión del editor:
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http://dx.doi.org/10.1021/am502419j
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Código del Proyecto:
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info:eu-repo/grantAgreement/MINECO//MAT2012-32084/ES/FUNDAMENTOS DE LA TECNOLOGIA DE NANOPOROS FUNCIONALIZADOS/
info:eu-repo/grantAgreement/GVA//PROMETEO%2FGV%2F069
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Agradecimientos:
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P.R., V.G., and S.M. acknowledge the financial support from the Generalitat Valenciana (Project PROMETEO/GV/0069), Ministry of Science and Innovation of Spain, Materials Program (Project MAT2012-32084), and FEDER. M.A., ...[+]
P.R., V.G., and S.M. acknowledge the financial support from the Generalitat Valenciana (Project PROMETEO/GV/0069), Ministry of Science and Innovation of Spain, Materials Program (Project MAT2012-32084), and FEDER. M.A., S.N., and W.E. thank Prof. C. Trautmann and crew (GSI, Department of Materials Research) for support with irradiation experiments.
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Tipo:
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Artículo
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