Ali, Mubarak ; Ahmed, Ishtiaq ; Ramirez, Patricio ; Nasir, Saima ; Mafe, Salvador ; Niemeyer, Christof M. ; Ensinger, Wolfgang (2017)
A redox-sensitive nanofluidic diode based on nicotinamide-modified asymmetric nanopores.
In: Sensors and Actuators B: Chemical, 240
doi: 10.1016/j.snb.2016.09.061
Article, Bibliographie
Abstract
We demonstrate a redox-sensitive nanofluidic diode whose ion rectification is modulated by the oxidation and reduction of chemical moieties incorporated on its surface. To achieve this goal, we have first synthesized the chemical compounds 1-(4-aminobutyl)-3-carbamoylpyridin-1-ium (Nic-BuNH2) and 3-carbamoyl-1-(2,4-dinitrophenyl)pyridinium (Nic-DNP). Then, the surface of track-etched single asymmetric nanopores is decorated with the redox-sensitive Nic-BuNH2 and Nic-DNP molecules using carbodiimide coupling chemistry and Zincke reaction, respectively. The success of the modification reactions is monitored through the changes in the current-voltage (I-V) curves prior to and after pore functionalization. Upon exposing the modified pore to solutions of hydrogen peroxide (oxidizing agent) and sodium dithionite (reducing agent) the surface charge is reversibly modulated from positive to neutral, leading to measurable changes in the electronic readout of ion current passing through the nanopore. On oxidation, the quaternary nicotinamide units impart positive charge to the pore surface, resulting in the ion current rectification (anion-selective pore). On the contrary, the complementary reduced dihydronicotinamide moieties resulted in the loss of surface charge and ohmic behaviour (non-selective pore). The experimental results are further theoretically described by using Poisson-Nernst-Planck equations.
| Item Type: | Article |
|---|---|
| Erschienen: | 2017 |
| Creators: | Ali, Mubarak ; Ahmed, Ishtiaq ; Ramirez, Patricio ; Nasir, Saima ; Mafe, Salvador ; Niemeyer, Christof M. ; Ensinger, Wolfgang |
| Type of entry: | Bibliographie |
| Title: | A redox-sensitive nanofluidic diode based on nicotinamide-modified asymmetric nanopores |
| Language: | English |
| Date: | March 2017 |
| Publisher: | Elsevier Science Publishing |
| Journal or Publication Title: | Sensors and Actuators B: Chemical |
| Volume of the journal: | 240 |
| DOI: | 10.1016/j.snb.2016.09.061 |
| URL / URN: | https://doi.org/10.1016/j.snb.2016.09.061 |
| Abstract: | We demonstrate a redox-sensitive nanofluidic diode whose ion rectification is modulated by the oxidation and reduction of chemical moieties incorporated on its surface. To achieve this goal, we have first synthesized the chemical compounds 1-(4-aminobutyl)-3-carbamoylpyridin-1-ium (Nic-BuNH2) and 3-carbamoyl-1-(2,4-dinitrophenyl)pyridinium (Nic-DNP). Then, the surface of track-etched single asymmetric nanopores is decorated with the redox-sensitive Nic-BuNH2 and Nic-DNP molecules using carbodiimide coupling chemistry and Zincke reaction, respectively. The success of the modification reactions is monitored through the changes in the current-voltage (I-V) curves prior to and after pore functionalization. Upon exposing the modified pore to solutions of hydrogen peroxide (oxidizing agent) and sodium dithionite (reducing agent) the surface charge is reversibly modulated from positive to neutral, leading to measurable changes in the electronic readout of ion current passing through the nanopore. On oxidation, the quaternary nicotinamide units impart positive charge to the pore surface, resulting in the ion current rectification (anion-selective pore). On the contrary, the complementary reduced dihydronicotinamide moieties resulted in the loss of surface charge and ohmic behaviour (non-selective pore). The experimental results are further theoretically described by using Poisson-Nernst-Planck equations. |
| Uncontrolled Keywords: | Synthetic nanopores, Redox reaction, Nicotinamide, Current rectification, Surface functionalization, Track-etching |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Material Analytics |
| Date Deposited: | 20 Sep 2016 05:42 |
| Last Modified: | 30 Jan 2019 13:51 |
| PPN: | |
| Funders: | M.A., S.N. and W.E. acknowledge the funding from the Hessen State Ministry of Higher Education, Research and the Arts, Germany, under the LOEWE project iNAPO., P. R. and S. M. acknowledge financial support by the Generalitat Valenciana (Program of Excellence Prometeo/GV/0069), the Spanish Ministry of Economic Affairs and Competitiveness (MAT2015-65011-P), and FEDER., I.A. and C.M.N. acknowledge financial support through the Helmholtz programme BioInterfaces in Technology and Medicine. |
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