TU Darmstadt / ULB / TUbiblio

Fabrication of Single Cylindrical Au-Coated Nanopores with Non-Homogeneous Fixed Charge Distribution Exhibiting High Current Rectifications

Nasir, Saima ; Ali, Mubarak ; Ramirez, Patricio ; Gomez, Vicente ; Oschmann, Bernd ; Muench, Falk ; Nawaz Tahir, Muhammad ; Zentel, Rudolf ; Mafe, Salvador ; Ensinger, Wolfgang (2014)
Fabrication of Single Cylindrical Au-Coated Nanopores with Non-Homogeneous Fixed Charge Distribution Exhibiting High Current Rectifications.
In: ACS Applied Materials & Interfaces, 6 (15)
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

We 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 was coated with a gold (Au) layer via electroless plating technique. Then, a non-homogeneous fixed charge distribution inside the Au-coated nanopore was obtained by incorporating thiol-terminated uncharged poly(N-isopropylacrylamide) chains in series to poly(4-vinylpyridine) chains, which were positively charged at acidic pH values. The functionalization reaction was checked by measuring the current?voltage curves prior to and after the chemisorption of polymer chains. The experimental nanopore characterization included 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 self-assembled monolayer formation chemistry, electroless plating, ion track etching) and physical models (two-region pore and Nernst?Planck equations) permits the obtainment of 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.

Typ des Eintrags: Artikel
Erschienen: 2014
Autor(en): Nasir, Saima ; Ali, Mubarak ; Ramirez, Patricio ; Gomez, Vicente ; Oschmann, Bernd ; Muench, Falk ; Nawaz Tahir, Muhammad ; Zentel, Rudolf ; Mafe, Salvador ; Ensinger, Wolfgang
Art des Eintrags: Bibliographie
Titel: Fabrication of Single Cylindrical Au-Coated Nanopores with Non-Homogeneous Fixed Charge Distribution Exhibiting High Current Rectifications
Sprache: Englisch
Publikationsjahr: August 2014
Titel der Zeitschrift, Zeitung oder Schriftenreihe: ACS Applied Materials & Interfaces
Jahrgang/Volume einer Zeitschrift: 6
(Heft-)Nummer: 15
URL / URN: http://dx.doi.org/10.1021/am502419j
Kurzbeschreibung (Abstract):

We 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 was coated with a gold (Au) layer via electroless plating technique. Then, a non-homogeneous fixed charge distribution inside the Au-coated nanopore was obtained by incorporating thiol-terminated uncharged poly(N-isopropylacrylamide) chains in series to poly(4-vinylpyridine) chains, which were positively charged at acidic pH values. The functionalization reaction was checked by measuring the current?voltage curves prior to and after the chemisorption of polymer chains. The experimental nanopore characterization included 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 self-assembled monolayer formation chemistry, electroless plating, ion track etching) and physical models (two-region pore and Nernst?Planck equations) permits the obtainment of 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.

Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialanalytik
11 Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 25 Aug 2014 14:29
Letzte Änderung: 25 Aug 2014 14:29
PPN:
Export:
Suche nach Titel in: TUfind oder in Google
Frage zum Eintrag Frage zum Eintrag

Optionen (nur für Redakteure)
Redaktionelle Details anzeigen Redaktionelle Details anzeigen