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Medvedev IG. Dependence of Differential Conductance of Electrochemical Transistor on Overpotential in Fully Non-Adiabatic Regime. RUSS J ELECTROCHEM+ 2022. [DOI: 10.1134/s1023193522120047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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2
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Chattopadhyay S, Bandyopadhyay S, Dey A. Kinetic Isotope Effects on Electron Transfer Across Self-Assembled Monolayers on Gold. Inorg Chem 2021; 60:597-605. [PMID: 33411526 DOI: 10.1021/acs.inorgchem.0c02185] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Reactions requiring controlled delivery of protons and electrons are important in storage of energy in small molecules. While control over proton transfer can be achieved by installing appropriate chemical functionality in the catalyst, control of electron-transfer (ET) rates can be achieved by utilizing self-assembled monolayers (SAMs) on electrodes. Thus, a deeper understanding of the ET through SAM to an immobilized or covalently attached redox-active species is desirable. Long-range ET across several SAM-covered Au electrodes to covalently attached ferrocene is investigated using protonated and deuterated thiols (R-SH/R-SD). The rate of tunneling is measured using both chronoamperometry and cyclic voltammetry, and it shows a prominent kinetic isotope effect (KIE). The KIE is ∼2 (normal) for medium-chain-length thiols but ∼0.47 (inverse) for long-chain thiols. These results imply substantial contribution from the classical modes at the Au-(H)SR interface, which shifts substantially upon deuteration of the thiols, to the ET process. The underlying H/D KIE of these exchangeable thiol protons should be considered when analyzing solvent isotope effects in catalysis utilizing SAM.
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Affiliation(s)
- Samir Chattopadhyay
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, West Bengal
| | - Sabyasachi Bandyopadhyay
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, West Bengal
| | - Abhishek Dey
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, West Bengal
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Zeng D, Salvatore P, Karlsen KK, Zhang J, Wengel J, Ulstrup J. Reprint of "Electrochemical intercalator binding to single- and double-strand DNA- and LNA-based molecules on Au(111)-electrode surfaces". J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.114527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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4
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Shermukhamedov SA, Nazmutdinov RR, Zinkicheva TT, Bronshtein MD, Zhang J, Mao B, Tian Z, Yan J, Wu DY, Ulstrup J. Electronic Spillover from a Metallic Nanoparticle: Can Simple Electrochemical Electron Transfer Processes Be Catalyzed by Electronic Coupling of a Molecular Scale Gold Nanoparticle Simultaneously to the Redox Molecule and the Electrode? J Am Chem Soc 2020; 142:10646-10658. [DOI: 10.1021/jacs.9b09362] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Shokirbek A. Shermukhamedov
- Kazan National Research Technological University, K. Marx Street, 68, 420015 Kazan, Republic of Tatarstan, Russian Federation
| | - Renat R. Nazmutdinov
- Kazan National Research Technological University, K. Marx Street, 68, 420015 Kazan, Republic of Tatarstan, Russian Federation
| | - Tamara T. Zinkicheva
- Kazan National Research Technological University, K. Marx Street, 68, 420015 Kazan, Republic of Tatarstan, Russian Federation
| | - Michael D. Bronshtein
- Kazan National Research Technological University, K. Marx Street, 68, 420015 Kazan, Republic of Tatarstan, Russian Federation
| | - Jingdong Zhang
- Department of Chemistry, Bldg. 207, Technical University of Denmark, DK-2800, Kgs. Lyngby, Denmark
| | - Bingwei Mao
- State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People’s Republic of China
| | - Zhongqun Tian
- State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People’s Republic of China
| | - Jiawei Yan
- State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People’s Republic of China
| | - De-Yin Wu
- State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People’s Republic of China
| | - Jens Ulstrup
- Kazan National Research Technological University, K. Marx Street, 68, 420015 Kazan, Republic of Tatarstan, Russian Federation
- Department of Chemistry, Bldg. 207, Technical University of Denmark, DK-2800, Kgs. Lyngby, Denmark
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Scida K, Eden A, Arroyo-Currás N, MacKenzie S, Satik Y, Meinhart CD, Eijkel JCT, Pennathur S. Fluorescence-Based Observation of Transient Electrochemical and Electrokinetic Effects at Nanoconfined Bipolar Electrodes. ACS APPLIED MATERIALS & INTERFACES 2019; 11:13777-13786. [PMID: 30880379 DOI: 10.1021/acsami.9b01339] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Bipolar electrodes (BPEs) are conductors that, when exposed to an electric field, polarize and promote the accumulation of counterionic charge near their poles. The rich physics of electrokinetic behavior near BPEs has not yet been rigorously studied, with our current understanding of such bipolar effects being restricted to steady-state conditions (under constant applied fields). Here, we reveal the dynamic electrokinetic and electrochemical phenomena that occur near nanoconfined BPEs throughout all stages of a reaction. Specifically, we demonstrate, both experimentally and through numerical modeling, that the removal of an electric field produces solution-phase charge imbalances in the vicinity of the BPE poles. These imbalances induce intense and short-lived nonequilibrium electric fields that drive the rapid transport of ions toward specific BPE locations. To determine the origin of these electrokinetic effects, we monitored the movement and fluorescent behavior (enhancement or quenching) of charged fluorophores within well-defined nanofluidic architectures via real-time optical detection. By systematically varying the nature of the fluorophore, the concentration of the electrolyte, the strength of the applied field, and oxide growth on the BPE surface, we dissect the ion transport events that occur in the aftermath of field-induced polarization. The results contained in this work provide new insights into transient bipolar electrokinetics that improve our understanding of current analytical platforms and can drive the development of new micro- and nanoelectrochemical systems.
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Affiliation(s)
- Karen Scida
- Department of Mechanical Engineering , University of California Santa Barbara , Santa Barbara , California 93106 , United States
| | - Alexander Eden
- Department of Mechanical Engineering , University of California Santa Barbara , Santa Barbara , California 93106 , United States
| | - Netzahualcóyotl Arroyo-Currás
- Department of Pharmacology and Molecular Sciences , Johns Hopkins University School of Medicine , Baltimore , Maryland 21205 , United States
| | - Sean MacKenzie
- Department of Mechanical Engineering , University of California Santa Barbara , Santa Barbara , California 93106 , United States
| | - Yesil Satik
- Department of Mechanical Engineering , University of California Santa Barbara , Santa Barbara , California 93106 , United States
| | - Carl D Meinhart
- Department of Mechanical Engineering , University of California Santa Barbara , Santa Barbara , California 93106 , United States
| | - Jan C T Eijkel
- Department of Electrical Engineering, Mathematics and Computer Science , University of Twente , Enschede , Overijssel 7522 , The Netherlands
| | - Sumita Pennathur
- Department of Mechanical Engineering , University of California Santa Barbara , Santa Barbara , California 93106 , United States
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Medvedev IG. Analytical expression for the tunnel current through the redox-mediated tunneling contact in the case of the adiabatic electron transfer at one of the working electrodes and any possible type of the electron transfer at the other electrode. J Chem Phys 2017; 147:194108. [PMID: 29166090 DOI: 10.1063/1.5011313] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
We study the tunnel current through a one-level redox molecule immersed into the electrolyte solution for the case when the coupling of the molecule to one of the working electrodes is strong while it is arbitrary to the other electrode. Using the Feynman-Vernon influence functional theory and the perturbation expansion of the effective action of the classical oscillator coupled both to the valence level of the redox molecule and to the thermal bath representing the classical fluctuations of the polarization of the solvent, we obtain, following the canonical way, the Langevin equation for the oscillator. It is found that for the aqueous electrolyte solution, the damping and the stochastic forces which arise due to the tunnel current are much smaller than those due to the thermal bath and therefore can be neglected. We estimate the higher-order corrections to the effective action and show that the Langevin dynamics takes place in this case for arbitrary parameters of the tunneling junction under the condition of the strong coupling of the redox molecule to one of the working electrodes. Then the steady-state coordinate distribution function of the oscillator resulting from the corresponding Fokker-Planck equation is the Boltzmann distribution function which is determined by the adiabatic free energy surface arising from the mean current-induced force. It enables us to obtain the expression for the tunnel current in the case when the coupling of the redox molecule to one of the working electrodes is strong while it is arbitrary to the other electrode.
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Affiliation(s)
- Igor G Medvedev
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences, Leninsky Prospect 31, 119071 Moscow, Russian Federation
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Medvedev IG. Exact identities between values of the tunnel current in the redox-mediated tunneling contacts and the positions of the extrema of the tunnel current/overvoltage characteristics. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.06.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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8
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Medvedev IG. On the evaluation of the rate constant of the heterogeneous non-adiabatic electron transfer reaction. J Electroanal Chem (Lausanne) 2016. [DOI: 10.1016/j.jelechem.2015.12.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Medvedev IG. Effect of the band structure of the electrodes on the non-adiabatic electron tunneling through a one-level redox molecule. Chem Phys 2015. [DOI: 10.1016/j.chemphys.2015.08.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Medvedev IG. Effect of the asymmetry of the coupling of the redox molecule to the electrodes in the one-level electrochemical bridged tunneling contact on the Coulomb blockade and the operation of molecular transistor. J Chem Phys 2014; 141:124706. [DOI: 10.1063/1.4895895] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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12
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Demonstrating why DFT-calculations for molecular transport in solvents need scissor corrections. Electrochem commun 2013. [DOI: 10.1016/j.elecom.2013.08.027] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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13
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Artés JM, López-Martínez M, Giraudet A, Díez-Pérez I, Sanz F, Gorostiza P. Current–Voltage Characteristics and Transition Voltage Spectroscopy of Individual Redox Proteins. J Am Chem Soc 2012. [DOI: 10.1021/ja3080242] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Juan M. Artés
- Institute for Bioengineering of Catalonia (IBEC), Baldiri Reixac 15-21, 08028 Barcelona,
Spain
| | | | - Arnaud Giraudet
- Institute for Bioengineering of Catalonia (IBEC), Baldiri Reixac 15-21, 08028 Barcelona,
Spain
| | - Ismael Díez-Pérez
- Institute for Bioengineering of Catalonia (IBEC), Baldiri Reixac 15-21, 08028 Barcelona,
Spain
- Physical Chemistry
Department, University of Barcelona (UB),
Martí i Franquès
1-11, Barcelona 08028, Spain
| | - Fausto Sanz
- Institute for Bioengineering of Catalonia (IBEC), Baldiri Reixac 15-21, 08028 Barcelona,
Spain
- Physical Chemistry
Department, University of Barcelona (UB),
Martí i Franquès
1-11, Barcelona 08028, Spain
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 50018 Zaragoza, Spain
| | - Pau Gorostiza
- Institute for Bioengineering of Catalonia (IBEC), Baldiri Reixac 15-21, 08028 Barcelona,
Spain
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 50018 Zaragoza, Spain
- Catalan Institution for Research and Advanced Studies (ICREA), 08010 Barcelona,
Spain
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Medvedev IG. Electrochemical transistor based on bridge tunneling contact containing two redox groups. RUSS J ELECTROCHEM+ 2012. [DOI: 10.1134/s1023193512020103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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15
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Medvedev IG. A theory of single-electron non-adiabatic tunneling through a small metal nanoparticle with due account of the strong interaction of valence electrons with phonons of the condensed matter environment. J Chem Phys 2011; 135:174705. [PMID: 22070315 DOI: 10.1063/1.3656767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A theory of electrochemical behavior of small metal nanoparticles (NPs) which is governed both by the charging effect and the effect of the solvent reorganization on the dynamic of the electron transfer (ET) is considered under ambient conditions. The exact expression for the rate constant of ET from an electrode to NP which is valid for all values of the reorganization free energy E(r), bias voltage, and overpotential is obtained in the non-adiabatic limit. The tunnel current/overpotential relations are studied and calculated for different values of the bias voltage and E(r). The effect of E(r) on the full width at half maximum of the charging peaks is investigated at different values of the bias voltage. The differential conductance/bias voltage and the tunnel current/bias voltage dependencies are also studied and calculated. It is shown that, at room temperature, the pronounced Coulomb blockade oscillations in the differential conductance/bias voltage curves and the noticeable Coulomb staircase in the tunnel current/bias voltage relations are observed only at rather small values of E(r) in the case of the strongly asymmetric tunneling contacts.
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Affiliation(s)
- Igor G Medvedev
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences, Moscow, Russia.
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Medvedev IG. Intramolecular quantum phonon modes effect in the non-adiabatic electron tunneling through a bridged electrochemical contact. J Electroanal Chem (Lausanne) 2011. [DOI: 10.1016/j.jelechem.2010.09.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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17
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Medvedev IG. Single-electron non-adiabatic tunneling through a metal nanoparticle with due account of the solvent dynamic effect: The generalization of the “orthodox” theory. Electrochem commun 2011. [DOI: 10.1016/j.elecom.2011.02.032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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18
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Medvedev IG. A theory of molecular transistor based on the two-center electrochemical bridged tunneling contact. Chem Phys 2011. [DOI: 10.1016/j.chemphys.2011.04.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Salvatore P, Glargaard Hansen A, Moth-Poulsen K, Bjørnholm T, John Nichols R, Ulstrup J. Voltammetry and in situscanning tunnelling spectroscopy of osmium, iron, and ruthenium complexes of 2,2′:6′,2′′-terpyridine covalently linked to Au(111)-electrodes. Phys Chem Chem Phys 2011; 13:14394-403. [DOI: 10.1039/c1cp21197h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Charge Transport in Single Molecular Junctions at the Solid/Liquid Interface. Top Curr Chem (Cham) 2011; 313:121-88. [DOI: 10.1007/128_2011_238] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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21
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Effects of inter-group correlations on sequential electron transitions through redox-mediated two-center electrochemical bridged contact. Electrochim Acta 2009. [DOI: 10.1016/j.electacta.2009.07.034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Kuznetsov AM, Medvedev IG, Ulstrup J. Coulomb repulsion effect in two-electron nonadiabatic tunneling through a one-level redox molecule. J Chem Phys 2009; 131:164703. [DOI: 10.1063/1.3253699] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Kuznetsov A, Medvedev I, Ulstrup J. Electrochemical proton relay at the single-molecule level. Electrochem commun 2009. [DOI: 10.1016/j.elecom.2009.03.040] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Kuznetsov AM. Theoretical analysis of the telegraph-like fluctuations in bridged electrochemical contacts. RUSS J ELECTROCHEM+ 2009. [DOI: 10.1134/s1023193509030148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Pobelov IV, Li Z, Wandlowski T. Electrolyte Gating in Redox-Active Tunneling Junctions—An Electrochemical STM Approach. J Am Chem Soc 2008; 130:16045-54. [DOI: 10.1021/ja8054194] [Citation(s) in RCA: 140] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ilya V. Pobelov
- Department of Chemistry and Biochemistry, University of Bern, CH-3012 Bern, Switzerland, and Institute of Bio- and Nanosystems IBN 3 and Center of Nanoelectronic Systems for Informational Technology, Research Center Jülich, D-52425 Jülich, Germany
| | - Zhihai Li
- Department of Chemistry and Biochemistry, University of Bern, CH-3012 Bern, Switzerland, and Institute of Bio- and Nanosystems IBN 3 and Center of Nanoelectronic Systems for Informational Technology, Research Center Jülich, D-52425 Jülich, Germany
| | - Thomas Wandlowski
- Department of Chemistry and Biochemistry, University of Bern, CH-3012 Bern, Switzerland, and Institute of Bio- and Nanosystems IBN 3 and Center of Nanoelectronic Systems for Informational Technology, Research Center Jülich, D-52425 Jülich, Germany
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Li C, Mishchenko A, Li Z, Pobelov I, Wandlowski T, Li XQ, Würthner F, Bagrets A, Evers F. Electrochemical gate-controlled electron transport of redox-active single perylene bisimide molecular junctions. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2008; 20:374122. [PMID: 21694429 DOI: 10.1088/0953-8984/20/37/374122] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We report a scanning tunneling microscopy (STM) experiment in an electrochemical environment which studies a prototype molecular switch. The target molecules were perylene tetracarboxylic acid bisimides modified with pyridine (P-PBI) and methylthiol (T-PBI) linker groups and with bulky tert-butyl-phenoxy substituents in the bay area. At a fixed bias voltage, we can control the transport current through a symmetric molecular wire Au|P-PBI(T-PBI)|Au by variation of the electrochemical 'gate' potential. The current increases by up to two orders of magnitude. The conductances of the P-PBI junctions are typically a factor 3 larger than those of T-PBI. A theoretical analysis explains this effect as a consequence of shifting the lowest unoccupied perylene level (LUMO) in or out of the bias window when tuning the electrochemical gate potential VG. The difference in on/off ratios reflects the variation of hybridization of the LUMO with the electrode states with the anchor groups. I(T)-E(S(T)) curves of asymmetric molecular junctions formed between a bare Au STM tip and a T-PBI (P-PBI) modified Au(111) electrode in an aqueous electrolyte exhibit a pronounced maximum in the tunneling current at -0.740, which is close to the formal potential of the surface-confined molecules. The experimental data were explained by a sequential two-step electron transfer process.
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Affiliation(s)
- C Li
- Department für Chemie und Biochemie, Universität of Bern, CH-3012-Bern, Switzerland. Institute of Bio- and Nanosystems IBN 3 and Center of Nanoelectronic Systems for Information Technology, Research Center Jülich, D-52425 Jülich, Germany
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Kuznetsov AM, Medvedev IG. A theory of redox-mediated electron tunneling through an electrochemical two-center contact. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2008; 20:374112. [PMID: 21694419 DOI: 10.1088/0953-8984/20/37/374112] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The dependences of the tunnel current on the overpotential and bias voltage for a symmetric electrochemical contact involving two redox groups are calculated. The main physical situations involving various combinations of the strengths of the electronic coupling of the redox groups with each other and with the electrodes are considered in detail. The treatment is more rigorous and complete as compared with previous work. In particular, totally adiabatic transitions are discussed and the potential distribution in the tunnel gap is taken into account. It is shown that the system under consideration manifests negative differential resistance and rectification. A new effect is predicted in the current/overpotential dependence, namely the appearance of two maxima. The experimental data of (Tran et al 2006 Faraday Discuss. 131 197) are addressed. It is concluded that they are compatible with the assumption on a strong screening of the electric potential within the tunnel gap.
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Medvedev IG. Effect of the density of the electronic states at the valence orbital of the bridge redox molecule on the dependence of the tunnel current on the overvoltage in the case of fully adiabatic electron transition. Electrochim Acta 2008. [DOI: 10.1016/j.electacta.2008.04.031] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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30
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Kuznetsov AM, Medvedev IG. Effect of Coulomb interaction between the electrons on two-electron redox-mediated tunneling. Electrochem commun 2008. [DOI: 10.1016/j.elecom.2008.05.031] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Zhang J, Kuznetsov AM, Medvedev IG, Chi Q, Albrecht T, Jensen PS, Ulstrup J. Single-Molecule Electron Transfer in Electrochemical Environments. Chem Rev 2008; 108:2737-91. [PMID: 18620372 DOI: 10.1021/cr068073+] [Citation(s) in RCA: 252] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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32
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From Self-Assembly to Charge Transport with Single Molecules – An Electrochemical Approach. Top Curr Chem (Cham) 2008; 287:181-255. [DOI: 10.1007/128_2008_152] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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33
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Kuznetsov AM. Theory of nonadiabatic electron transitions in symmetrical two-center tunnel electrochemical contact. RUSS J ELECTROCHEM+ 2007. [DOI: 10.1134/s1023193507120014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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