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Nasir S, Ali M, Ramirez P, et al. Fabrication of single cylindrical Au-coated nanopores with non-homogeneous fixed charge distribution exhibiting high current rectifications. ACS Appl Mater Interfaces. 2014;6(15):12486-94doi: 10.1021/am502419j.
Nasir, S., Ali, M., Ramirez, P., Gómez, V., Oschmann, B., Muench, F., Tahir, M. N., Zentel, R., Mafe, S., & Ensinger, W. (2014). Fabrication of single cylindrical Au-coated nanopores with non-homogeneous fixed charge distribution exhibiting high current rectifications. ACS applied materials & interfaces, 6(15), 12486-94. https://doi.org/10.1021/am502419j
Nasir, Saima, et al. "Fabrication of single cylindrical Au-coated nanopores with non-homogeneous fixed charge distribution exhibiting high current rectifications." ACS applied materials & interfaces vol. 6,15 (2014): 12486-94. doi: https://doi.org/10.1021/am502419j
Nasir S, Ali M, Ramirez P, Gómez V, Oschmann B, Muench F, Tahir MN, Zentel R, Mafe S, Ensinger W. Fabrication of single cylindrical Au-coated nanopores with non-homogeneous fixed charge distribution exhibiting high current rectifications. ACS Appl Mater Interfaces. 2014 Aug 13;6(15):12486-94. doi: 10.1021/am502419j. Epub 2014 Jul 30. PMID: 25051046.
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ACS Appl Mater Interfaces. 2014 Aug 13;6(15):12486-94. doi: 10.1021/am502419j. Epub 2014 Jul 30.

Fabrication of single cylindrical Au-coated nanopores with non-homogeneous fixed charge distribution exhibiting high current rectifications.

ACS applied materials & interfaces

Saima Nasir, Mubarak Ali, Patricio Ramirez, Vicente Gómez, Bernd Oschmann, Falk Muench, Muhammad Nawaz Tahir, Rudolf Zentel, Salvador Mafe, Wolfgang Ensinger

Affiliations

  1. Department of Material- and Geo-Sciences, Materials Analysis, Technische Universität Darmstadt , D-64287 Darmstadt, Germany.

PMID: 25051046 DOI: 10.1021/am502419j

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.

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