Ali, Mubarak ; Ramirez, Patricio ; Nguyen, Hung Quoc ; Nasir, Saima ; Cervera, Javier ; Mafe, Salvador ; Ensinger, Wolfgang (2012)
Single Cigar-Shaped Nanopores Functionalized with Amphoteric Amino Acid Chains: Experimental and Theoretical Characterization.
In: ACS Nano, 6 (4)
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We present an experimental and theoretical characterization of single cigar-shaped nanopores with pH-responsive carboxylic acid and lysine chains functionalized on the pore surface. The nanopore characterization includes (i) optical images of the nanostructure obtained by FESEM; (ii) different chemical procedures for the nanopore preparation (etching time and functionalizations; pH and electrolyte concentration of the external solution) allowing externally tunable nanopore responses monitored by the current–voltage (I–V) curves; and (iii) transport simulations obtained with a multilayer nanopore model. We show that a single, approximately symmetric nanopore can be operated as a reconfigurable diode showing different rectifying behaviors by applying chemical and electrical signals. The remarkable characteristics of the new nanopore are the sharp response observed in the I–V curves, the improved tunability (with respect to previous designs of symmetric nanopores) which is achieved because of the direct external access to the nanostructure mouths, and the broad range of rectifying properties. The results concern both fundamental concepts useful for the understanding of transport processes in biological systems (ion channels) and applications relevant for tunable nanopore technology (information processing and drug controlled release).
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2012 |
| Autor(en): | Ali, Mubarak ; Ramirez, Patricio ; Nguyen, Hung Quoc ; Nasir, Saima ; Cervera, Javier ; Mafe, Salvador ; Ensinger, Wolfgang |
| Art des Eintrags: | Bibliographie |
| Titel: | Single Cigar-Shaped Nanopores Functionalized with Amphoteric Amino Acid Chains: Experimental and Theoretical Characterization |
| Sprache: | Englisch |
| Publikationsjahr: | 29 März 2012 |
| Verlag: | ACS Publications |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | ACS Nano |
| Jahrgang/Volume einer Zeitschrift: | 6 |
| (Heft-)Nummer: | 4 |
| URL / URN: | http://dx.doi.org/10.1021/nn3010119 |
| Kurzbeschreibung (Abstract): | We present an experimental and theoretical characterization of single cigar-shaped nanopores with pH-responsive carboxylic acid and lysine chains functionalized on the pore surface. The nanopore characterization includes (i) optical images of the nanostructure obtained by FESEM; (ii) different chemical procedures for the nanopore preparation (etching time and functionalizations; pH and electrolyte concentration of the external solution) allowing externally tunable nanopore responses monitored by the current–voltage (I–V) curves; and (iii) transport simulations obtained with a multilayer nanopore model. We show that a single, approximately symmetric nanopore can be operated as a reconfigurable diode showing different rectifying behaviors by applying chemical and electrical signals. The remarkable characteristics of the new nanopore are the sharp response observed in the I–V curves, the improved tunability (with respect to previous designs of symmetric nanopores) which is achieved because of the direct external access to the nanostructure mouths, and the broad range of rectifying properties. The results concern both fundamental concepts useful for the understanding of transport processes in biological systems (ion channels) and applications relevant for tunable nanopore technology (information processing and drug controlled release). |
| Freie Schlagworte: | cigar-shaped nanopore, amphoteric amino acid chains, current−voltage curves, logic functions |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialanalytik 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 30 Mai 2012 13:44 |
| Letzte Änderung: | 05 Mär 2013 10:01 |
| PPN: | |
| Sponsoren: | P.R., J.C., and S.M. acknowledge the financial support from the Ministry of Science and Innovation of Spain, Materials Program (Project Nos. MAT2009-07747) and FEDER., M.A., Q.H.N., S.N, and W.E. gratefully acknowledge financial support by the Beilstein-Institut, Frankfurt/Main, Germany, within the research collaboration NanoBiC. |
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