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Yin H, Tan C, Siddiqui S, Arumugam PU. Electrochemical Redox Cycling Behavior of Gold Nanoring Electrodes Microfabricated on a Silicon Micropillar. MICROMACHINES 2023; 14:726. [PMID: 37420959 DOI: 10.3390/mi14040726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 03/10/2023] [Accepted: 03/22/2023] [Indexed: 07/09/2023]
Abstract
We report the microfabrication and characterization of concentric gold nanoring electrodes (Au NREs), which were fabricated by patterning two gold nanoelectrodes on the same silicon (Si) micropillar tip. Au NREs of 165 ± 10 nm in width were micropatterned on a 6.5 ± 0.2 µm diameter 80 ± 0.5 µm height Si micropillar with an intervening ~ 100 nm thick hafnium oxide insulating layer between the two nanoelectrodes. Excellent cylindricality of the micropillar with vertical sidewalls as well as a completely intact layer of a concentric Au NRE including the entire micropillar perimeter has been achieved as observed via scanning electron microscopy and energy dispersive spectroscopy data. The electrochemical behavior of the Au NREs was characterized by steady-state cyclic voltammetry and electrochemical impedance spectroscopy. The applicability of Au NREs to electrochemical sensing was demonstrated by redox cycling with the ferro/ferricyanide redox couple. The redox cycling amplified the currents by 1.63-fold with a collection efficiency of > 90% on a single collection cycle. The proposed micro-nanofabrication approach with further optimization studies shows great promise for the creation and expansion of concentric 3D NRE arrays with controllable width and nanometer spacing for electroanalytical research and applications such as single-cell analysis and advanced biological and neurochemical sensing.
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Affiliation(s)
- Haocheng Yin
- School of Microelectronics, Xidian University, Key Laboratory of Wide Band-Gap Semiconductor Materials and Devices of China, Xi'an 710071, China
| | - Chao Tan
- Institute for Micromanufacturing, Louisiana Tech University, Ruston, LA 71272, USA
| | - Shabnam Siddiqui
- Department of Chemistry and Physics, Louisiana State University Shreveport, Shreveport, LA 71101, USA
| | - Prabhu U Arumugam
- Institute for Micromanufacturing, Louisiana Tech University, Ruston, LA 71272, USA
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2
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Song Q, Li Q, Yan J, Song Y. Echem methods and electrode types of the current in vivo electrochemical sensing. RSC Adv 2022; 12:17715-17739. [PMID: 35765338 PMCID: PMC9199085 DOI: 10.1039/d2ra01273a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 06/02/2022] [Indexed: 11/21/2022] Open
Abstract
For a long time, people have been eager to realize continuous real-time online monitoring of biological compounds. Fortunately, in vivo electrochemical biosensor technology has greatly promoted the development of biological compound detection. This article summarizes the existing in vivo electrochemical detection technologies into two categories: microdialysis (MD) and microelectrode (ME). Then we summarized and discussed the electrode surface time, pollution resistance, linearity and the number of instances of simultaneous detection and analysis, the composition and characteristics of the sensor, and finally, we also predicted and prospected the development of electrochemical technology and sensors in vivo.
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Affiliation(s)
- Qiuye Song
- The Affiliated Zhangjiagang Hospital of Soochow University Zhangjiagang 215600 Jiangsu People's Republic of China +86 791 87802135 +86 791 87802135
| | - Qianmin Li
- Key Laboratory of Depression Animal Model Based on TCM Syndrome, Jiangxi Administration of Traditional Chinese Medicine, Key Laboratory of TCM for Prevention and Treatment of Brain Diseases with Cognitive Dysfunction, Jiangxi Province, Jiangxi University of Chinese Medicine 1688 Meiling Road Nanchang 330006 China
| | - Jiadong Yan
- The Affiliated Zhangjiagang Hospital of Soochow University Zhangjiagang 215600 Jiangsu People's Republic of China +86 791 87802135 +86 791 87802135
| | - Yonggui Song
- Key Laboratory of Depression Animal Model Based on TCM Syndrome, Jiangxi Administration of Traditional Chinese Medicine, Key Laboratory of TCM for Prevention and Treatment of Brain Diseases with Cognitive Dysfunction, Jiangxi Province, Jiangxi University of Chinese Medicine 1688 Meiling Road Nanchang 330006 China.,Key Laboratory of Pharmacodynamics and Safety Evaluation, Health Commission of Jiangxi Province, Nanchang Medical College 1688 Meiling Road Nanchang 330006 China
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3
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Playing with sizes and shapes of colloidal particles via dry etching methods. Adv Colloid Interface Sci 2022; 299:102538. [PMID: 34906837 DOI: 10.1016/j.cis.2021.102538] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 09/21/2021] [Accepted: 09/27/2021] [Indexed: 12/17/2022]
Abstract
Monolayers of self-assembled quasi-spherical colloidal particles are essential building blocks in the field of materials science and engineering. More typically, they are used as a template for the fabrication of nanostructures if they serve, for instance, as a mask for deposition of new material on the surface on which particles are assembled or for etching of the material underneath; in this case, they are removed afterwards. This is what occurs in colloidal or nanosphere lithography. In some other cases, they are not used as a sacrificial material but they are incorporated in the final structure because they are inherently interesting for their properties. Independently of their specific use and application, different strategies have been devised in order to modify size and shape of colloidal particles, so as to enrich the variety of attainable patterns and to tailor the properties of the final structures and materials. In this review, we will focus on one of the most widespread methods to shape spherical colloidal particles, i.e. dry etching techniques. We will follow the development of such approaches until recent days, so as to trace an extensive panorama of the diverse parameters that can be harnessed to achieve specific morphological changes and highlight the characteristic features of the variants of this method. We will finally discuss how particles modified via dry etching can be used for patterning or can be resuspended in solvents for very diverse applications.
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4
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Sassa F, Biswas GC, Suzuki H. Microfabricated electrochemical sensing devices. LAB ON A CHIP 2020; 20:1358-1389. [PMID: 32129358 DOI: 10.1039/c9lc01112a] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Electrochemistry provides possibilities to realize smart microdevices of the next generation with high functionalities. Electrodes, which constitute major components of electrochemical devices, can be formed by various microfabrication techniques, and integration of the same (or different) components for that purpose is not difficult. Merging this technique with microfluidics can further expand the areas of application of the resultant devices. To augment the development of next generation devices, it will be beneficial to review recent technological trends in this field and clarify the directions required for moving forward. Even when limiting the discussion to electrochemical microdevices, a variety of useful techniques should be considered. Therefore, in this review, we attempted to provide an overview of all relevant techniques in this context in the hope that it can provide useful comprehensive information.
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Affiliation(s)
- Fumihiro Sassa
- Graduate School of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
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Vajrala VS, Sekli Belaidi F, Lemercier G, Zigah D, Rigoulet M, Devin A, Sojic N, Temple-Boyer P, Launay J, Arbault S. Microwell array integrating nanoelectrodes for coupled opto-electrochemical monitorings of single mitochondria. Biosens Bioelectron 2019; 126:672-678. [DOI: 10.1016/j.bios.2018.11.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Revised: 11/07/2018] [Accepted: 11/20/2018] [Indexed: 12/22/2022]
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6
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Pathirathna P, Balla RJ, Amemiya S. Nanogap-Based Electrochemical Measurements at Double-Carbon-Fiber Ultramicroelectrodes. Anal Chem 2018; 90:11746-11750. [PMID: 30251536 PMCID: PMC6534271 DOI: 10.1021/acs.analchem.8b02987] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Electrochemical measurements with unprecedentedly high sensitivity, selectivity, and kinetic resolution have been enabled by a pair of electrodes separated by a nanometer-wide gap. The fabrication of nanogap electrodes, however, requires extensive nanolithography or nanoscale electrode positioning, thereby preventing the full exploration of this powerful method in electrode design and application. Herein, we report the simple fabrication of double-carbon-fiber ultramicroelectrodes (UMEs) with nanometer-wide gaps not only to facilitate nanogap-based electrochemical measurements but also to gain high time resolution, signal-to-background ratio, and kinetic selectivity for dopamine against ascorbic acid. Specifically, ∼7 μm-diameter carbon fibers are inserted into a double-bore glass capillary, heat-pulled, and milled by focused ion-beam technology to yield ∼50 μm-long double-cylinder UMEs. The redox cycling of the Ru(NH3)63+/2+ couple across a nanogap between voltammetric generator and amperometric collector electrodes reaches quasi-steady states at fast scan rates of 100 V/s as demonstrated experimentally and even 1000 V/s as predicted theoretically. The transient background of the amperometric collector response is suppressed ∼100 times in comparison with that of the voltammetric generator response. Nanogap voltammograms based on the collector response against the cycled generator potential are quantitatively analyzed without background subtraction to reproducibly yield nanogap widths of ∼0.18 μm and a standard electron-transfer rate constant of 0.9 cm/s. Moreover, nanogap-mediated redox cycling can be initiated by dopamine oxidation at the generator electrode to largely improve the dopamine selectivity of the collector response against ascorbic acid, which is also oxidized at the generator electrode to immediately and irreversibly produce a redox-inactive species.
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Affiliation(s)
- Pavithra Pathirathna
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania, 15260, United States
| | - Ryan J. Balla
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania, 15260, United States
| | - Shigeru Amemiya
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania, 15260, United States
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7
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Fu K, Han D, Ma C, Bohn PW. Electrochemistry at single molecule occupancy in nanopore-confined recessed ring-disk electrode arrays. Faraday Discuss 2018; 193:51-64. [PMID: 27711896 DOI: 10.1039/c6fd00062b] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Electrochemical reactions at nanoscale structures possess unique characteristics, e.g. fast mass transport, high signal-to-noise ratio at low concentration, and insignificant ohmic losses even at low electrolyte concentrations. These properties motivate the fabrication of high density, laterally ordered arrays of nanopores, embedding vertically stacked metal-insulator-metal electrode structures and exhibiting precisely controlled pore size and interpore spacing for use in redox cycling. These nanoscale recessed ring-disk electrode (RRDE) arrays exhibit current amplification factors, AFRC, as large as 55-fold with Ru(NH3)62/3+, indicative of capture efficiencies at the top and bottom electrodes, Φt,b, exceeding 99%. Finite element simulations performed to investigate the concentration distribution of redox species and to assess operating characteristics are in excellent agreement with experiment. AFRC increases as the pore diameter, at constant pore spacing, increases in the range 200-500 nm and as the pore spacing, at constant pore diameter, decreases in the range 1000-460 nm. Optimized nanoscale RRDE arrays exhibit a linear current response with concentration ranging from 0.1 μM to 10 mM and a small capacitive current with scan rate up to 100 V s-1. At the lowest concentrations, the average pore occupancy is 〈n〉 ∼ 0.13 molecule establishing productive electrochemical signals at occupancies at and below the single molecule level in these nanoscale RRDE arrays.
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Affiliation(s)
- Kaiyu Fu
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, USA.
| | - Donghoon Han
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Chaoxiong Ma
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, USA.
| | - Paul W Bohn
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, USA. and Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
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8
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Ding S, Liu Y, Ma C, Zhang J, Zhu A, Shi G. Development of Glass-sealed Gold Nanoelectrodes for in vivo
Detection of Dopamine in Rat Brain. ELECTROANAL 2018. [DOI: 10.1002/elan.201700522] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Shushu Ding
- School of Chemistry and Molecular Engineering; East China Normal University; 500 Dongchuan Road Shanghai 200241 People's Republic of China
| | - Yingzi Liu
- Institute of Brain Functional Genomics; East China Normal University; 3663 Zhongshan Road North Shanghai 200062 People's Republic of China
| | - Chunrong Ma
- School of Chemistry and Molecular Engineering; East China Normal University; 500 Dongchuan Road Shanghai 200241 People's Republic of China
| | - Junqi Zhang
- School of Chemistry and Molecular Engineering; East China Normal University; 500 Dongchuan Road Shanghai 200241 People's Republic of China
| | - Anwei Zhu
- School of Chemistry and Molecular Engineering; East China Normal University; 500 Dongchuan Road Shanghai 200241 People's Republic of China
| | - Guoyue Shi
- School of Chemistry and Molecular Engineering; East China Normal University; 500 Dongchuan Road Shanghai 200241 People's Republic of China
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9
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Pathirathna P, Balla RJ, Amemiya S. Simulation of Fast-Scan Nanogap Voltammetry at Double-Cylinder Ultramicroelectrodes. JOURNAL OF THE ELECTROCHEMICAL SOCIETY 2018; 165:G3026-G3032. [PMID: 31156270 PMCID: PMC6541457 DOI: 10.1149/2.0051812jes] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
High temporal resolution of fast-scan cyclic voltammetry (FSCV) is widely appreciated in fundamental and applied electrochemistry to quantitatively investigate rapid dynamics of electron transfer and neurotransmission using ultramicroelectrodes (UMEs). Faster potential scan, however, linearly increases the background current, which must be subtracted for quantitative FSCV. Herein, we numerically simulate fast-scan nanogap voltammetry (FSNV) for quantitative detection of diffusing redox species under quasi-steady states without the need of background subtraction while maintaining high temporal resolution of transient FSCV. These advantages of FSNV originate from the use of a parallel pair of cylindrical UMEs with nanometer-wide separation in contrast to FSCV with single UMEs. In FSNV, diffusional redox cycling across the nanogap is driven voltammetrically at the generator electrode and monitored amperometrically at the collector electrode without the transient background. We reveal that the cylindrical collector electrode can reach quasi-steady states ~104 times faster than the generator electrode with identical sizes to allow for fast scan. Double-microcylinder and nanocylinder UMEs enable quasi-steady-state FSNV at hundreds volts per second as practiced for in-vivo FSCV and megavolts per second as achieved for ultra-FSCV, respectively. Rational design and simple fabrication of double-cylinder UMEs are proposed to broaden the application of nanogap voltammetry.
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10
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Wu MS, Chen WA. Numerical simulation of differential cyclic voltammetry for amplified and separate detection of redox couples using dual-plate microgap device. J Taiwan Inst Chem Eng 2017. [DOI: 10.1016/j.jtice.2017.08.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Fu K, Han D, Ma C, Bohn PW. Ion selective redox cycling in zero-dimensional nanopore electrode arrays at low ionic strength. NANOSCALE 2017; 9:5164-5171. [PMID: 28393950 DOI: 10.1039/c7nr00206h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Surface charge characteristics and the electrical double layer (EDL) effect govern the transport of ions into and out of nanopores, producing a permselective concentration polarization, which dominates the electrochemical response of nanoelectrodes in solutions of low ionic strength. In this study, highly ordered, zero-dimensional nanopore electrode arrays (NEAs), with each nanopore presenting a pair of recessed electrodes, were fabricated to couple EDL effects with redox cycling, thereby achieving electrochemical detection with improved sensitivity and selectivity. These NEAs exhibit current amplification as high as 55-fold due to the redox cycling effect, which can be further increased by ∼500-fold upon the removal of the supporting electrolyte. The effect of nanopore geometry, which is a key factor determining the magnitude of the EDL effect, is fully characterized, as is the effect of the magnitude and sign of the charge of the redox-active species. The observed changes in limiting current with the concentration of the supporting electrolyte confirm the accumulation of cations and repulsion of anions in NEAs presenting negative surface charge. Exploiting this principle, dopamine was selectively determined in the presence of a 3000-fold excess of ascorbic acid within the NEA.
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Affiliation(s)
- Kaiyu Fu
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, USA.
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12
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Hood RL, Hood GD, Ferrari M, Grattoni A. Pioneering medical advances through nanofluidic implantable technologies. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2017; 9. [DOI: 10.1002/wnan.1455] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Revised: 11/27/2016] [Accepted: 12/17/2016] [Indexed: 12/11/2022]
Affiliation(s)
- R. Lyle Hood
- Department of Nanomedicine; Houston Methodist Research Institute; Houston TX USA
- Department of Mechanical Engineering; University of Texas San Antonio; San Antonio TX USA
| | - Gold Darr Hood
- Department of Nanomedicine; Houston Methodist Research Institute; Houston TX USA
| | - Mauro Ferrari
- Department of Nanomedicine; Houston Methodist Research Institute; Houston TX USA
| | - Alessandro Grattoni
- Department of Nanomedicine; Houston Methodist Research Institute; Houston TX USA
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13
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Adly N, Feng L, Krause KJ, Mayer D, Yakushenko A, Offenhäusser A, Wolfrum B. Flexible Microgap Electrodes by Direct Inkjet Printing for Biosensing Application. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/adbi.201600016] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Nouran Adly
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA - Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
| | - Lingyan Feng
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA - Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
- Materials Genome Institute; Shanghai University; 200444 Shanghai China
| | - Kay J. Krause
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA - Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
| | - Dirk Mayer
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA - Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
| | - Alexey Yakushenko
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA - Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
| | - Andreas Offenhäusser
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA - Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
| | - Bernhard Wolfrum
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA - Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
- Neuroelectronics; Munich School of Bioengineering; Department of Electrical and Computer Engineering; Technical University of Munich (TUM) & BCCN Munich; Boltzmannstrasse 11 85748 Garching Germany
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14
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Three-dimensional graphene-like carbon frameworks as a new electrode material for electrochemical determination of small biomolecules. Biosens Bioelectron 2016; 85:618-624. [DOI: 10.1016/j.bios.2016.05.065] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2016] [Revised: 05/13/2016] [Accepted: 05/21/2016] [Indexed: 11/30/2022]
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15
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Redox cycling with ITO electrodes separated by an ultrathin silica nanochannel membrane. Electrochem commun 2016. [DOI: 10.1016/j.elecom.2016.08.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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16
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Finkelstein DA. Sensor Selectivity Enhancement via Electrochemical Shielding in a Recessed Microelectrode Array: The Gatekeeper Geometry. ACS Sens 2016. [DOI: 10.1021/acssensors.6b00496] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- David A. Finkelstein
- Institut National de la Recherche Scientifique − Énergie, Matériaux, et Télécommunications (INRS-EMT), 1650 Boulevard Lionel-Boulet, Varennes, Quebec, Canada J3X 1S2
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17
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Wolfrum B, Kätelhön E, Yakushenko A, Krause KJ, Adly N, Hüske M, Rinklin P. Nanoscale Electrochemical Sensor Arrays: Redox Cycling Amplification in Dual-Electrode Systems. Acc Chem Res 2016; 49:2031-40. [PMID: 27602780 DOI: 10.1021/acs.accounts.6b00333] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Micro- and nanofabriation technologies have a tremendous potential for the development of powerful sensor array platforms for electrochemical detection. The ability to integrate electrochemical sensor arrays with microfluidic devices nowadays provides possibilities for advanced lab-on-a-chip technology for the detection or quantification of multiple targets in a high-throughput approach. In particular, this is interesting for applications outside of analytical laboratories, such as point-of-care (POC) or on-site water screening where cost, measurement time, and the size of individual sensor devices are important factors to be considered. In addition, electrochemical sensor arrays can monitor biological processes in emerging cell-analysis platforms. Here, recent progress in the design of disease model systems and organ-on-a-chip technologies still needs to be matched by appropriate functionalities for application of external stimuli and read-out of cellular activity in long-term experiments. Preferably, data can be gathered not only at a singular location but at different spatial scales across a whole cell network, calling for new sensor array technologies. In this Account, we describe the evolution of chip-based nanoscale electrochemical sensor arrays, which have been developed and investigated in our group. Focusing on design and fabrication strategies that facilitate applications for the investigation of cellular networks, we emphasize the sensing of redox-active neurotransmitters on a chip. To this end, we address the impact of the device architecture on sensitivity, selectivity as well as on spatial and temporal resolution. Specifically, we highlight recent work on redox-cycling concepts using nanocavity sensor arrays, which provide an efficient amplification strategy for spatiotemporal detection of redox-active molecules. As redox-cycling electrochemistry critically depends on the ability to miniaturize and integrate closely spaced electrode systems, the fabrication of suitable nanoscale devices is of utmost importance for the development of this advanced sensor technology. Here, we address current challenges and limitations, which are associated with different redox cycling sensor array concepts and fabrication approaches. State-of-the-art micro- and nanofabrication technologies based on optical and electron-beam lithography allow precise control of the device layout and have led to a new generation of electrochemical sensor architectures for highly sensitive detection. Yet, these approaches are often expensive and limited to clean-room compatible materials. In consequence, they lack possibilities for upscaling to high-throughput fabrication at moderate costs. In this respect, self-assembly techniques can open new routes for electrochemical sensor design. This is true in particular for nanoporous redox cycling sensor arrays that have been developed in recent years and provide interesting alternatives to clean-room fabricated nanofluidic redox cycling devices. We conclude this Account with a discussion of emerging fabrication technologies based on printed electronics that we believe have the potential of transforming current redox cycling concepts from laboratory tools for fundamental studies and proof-of-principle analytical demonstrations into high-throughput devices for rapid screening applications.
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Affiliation(s)
- Bernhard Wolfrum
- Institute
of Bioelectronics (PGI-8/ICS-8), Forschungszentrum Jülich, 52425 Jülich, Germany
- Neuroelectronics,
IMETUM, Department of Electrical and Computer Engineering, Technical University of Munich, Boltzmannstr. 11, 85748 Garching, Germany
| | - Enno Kätelhön
- Institute
of Bioelectronics (PGI-8/ICS-8), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Alexey Yakushenko
- Institute
of Bioelectronics (PGI-8/ICS-8), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Kay J. Krause
- Institute
of Bioelectronics (PGI-8/ICS-8), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Nouran Adly
- Institute
of Bioelectronics (PGI-8/ICS-8), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Martin Hüske
- Institute
of Bioelectronics (PGI-8/ICS-8), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Philipp Rinklin
- Neuroelectronics,
IMETUM, Department of Electrical and Computer Engineering, Technical University of Munich, Boltzmannstr. 11, 85748 Garching, Germany
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18
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He D, Yan J, Zhu F, Zhou Y, Mao B, Oleinick A, Svir I, Amatore C. Enhancing the Bipolar Redox Cycling Efficiency of Plane-Recessed Microelectrode Arrays by Adding a Chemically Irreversible Interferent. Anal Chem 2016; 88:8535-41. [PMID: 27490270 DOI: 10.1021/acs.analchem.6b01454] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The individual electrochemical anodic responses of dopamine (DA), epinephrine (EP), and pyrocatechol (CT) were investigated at arrays of recessed gold disk-microelectrodes arrays (MEAs) covered by a gold plane electrode and compared to those of their binary mixture (CT and EP) when the top-plane electrode was operated as a bipolar electrode or as a collector. The interferent species (EP) displays a chemically irreversible wave over the same potential range as the chemically reversible ones of DA or CT. As expected, in the generator-collector (GC) mode, EP did not contribute to the redox cycling amplification that occurred only for DA or CT. Conversely, in the bipolar mode, the presence of EP drastically increased the bipolar redox cycling efficiency of DA and CT. This evidenced that the chemically irreversible oxidation of EP at the anodic poles of the top plane floating electrode provided additional electron fluxes that were used to more efficiently reduce the oxidized DA or CT species at the cathodic poles. This suggests an easy experimental strategy for enhancing the bipolar efficiency of MEAs up to reach a performance identical to that achieved when the same MEAs are operated in a GC mode.
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Affiliation(s)
- Dingwen He
- State Key Laboratory for Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, PR China
| | - Jiawei Yan
- State Key Laboratory for Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, PR China
| | - Feng Zhu
- State Key Laboratory for Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, PR China
| | - Yongliang Zhou
- State Key Laboratory for Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, PR China
| | - Bingwei Mao
- State Key Laboratory for Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, PR China
| | - Alexander Oleinick
- CNRS UMR 8640 "PASTEUR", Sorbonne Universités - UPMC Univ Paris 06, Ecole Normale Supérieure - PSL Research University , Département de Chimie, 24 rue Lhomond, Paris 75005, France
| | - Irina Svir
- CNRS UMR 8640 "PASTEUR", Sorbonne Universités - UPMC Univ Paris 06, Ecole Normale Supérieure - PSL Research University , Département de Chimie, 24 rue Lhomond, Paris 75005, France
| | - Christian Amatore
- CNRS UMR 8640 "PASTEUR", Sorbonne Universités - UPMC Univ Paris 06, Ecole Normale Supérieure - PSL Research University , Département de Chimie, 24 rue Lhomond, Paris 75005, France
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19
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Hu M, Fritsch I. Application of Electrochemical Redox Cycling: Toward Differentiation of Dopamine and Norepinephrine. Anal Chem 2016; 88:5574-8. [DOI: 10.1021/acs.analchem.6b00427] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Mengjia Hu
- Department of Chemistry and
Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Ingrid Fritsch
- Department of Chemistry and
Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
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20
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Ma C, Xu W, Wichert WRA, Bohn PW. Ion Accumulation and Migration Effects on Redox Cycling in Nanopore Electrode Arrays at Low Ionic Strength. ACS NANO 2016; 10:3658-64. [PMID: 26910572 DOI: 10.1021/acsnano.6b00049] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Ion permselectivity can lead to accumulation in zero-dimensional nanopores, producing a significant increase in ion concentration, an effect which may be combined with unscreened ion migration to improve sensitivity in electrochemical measurements, as demonstrated by the enormous current amplification (∼2000-fold) previously observed in nanopore electrode arrays (NEA) in the absence of supporting electrolyte. Ionic strength is a key experimental factor that governs the magnitude of the additional current amplification (AFad) beyond simple redox cycling through both ion accumulation and ion migration effects. Separate contributions from ion accumulation and ion migration to the overall AFad were identified by studying NEAs with varying geometries, with larger AFad values being achieved in NEAs with smaller pores. In addition, larger AFad values were observed for Ru(NH3)6(3/2+) than for ferrocenium/ferrocene (Fc(+)/Fc) in aqueous solution, indicating that coupling efficiency in redox cycling can significantly affect AFad. While charged species are required to observe migration effects or ion accumulation, poising the top electrode at an oxidizing potential converts neutral species to cations, which can then exhibit current amplification similar to starting with the cation. The electrical double layer effect was also demonstrated for Fc/Fc(+) in acetonitrile and 1,2-dichloroethane, producing AFad up to 100× at low ionic strength. The pronounced AFad effects demonstrate the advantage of coupling redox cycling with ion accumulation and migration effects for ultrasensitive electrochemical measurements.
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Affiliation(s)
- Chaoxiong Ma
- Department of Chemistry and Biochemistry and ‡Department of Chemical and Biomolecular Engineering, University of Notre Dame , Notre Dame, Indiana 46556, United States
| | - Wei Xu
- Department of Chemistry and Biochemistry and ‡Department of Chemical and Biomolecular Engineering, University of Notre Dame , Notre Dame, Indiana 46556, United States
| | - William R A Wichert
- Department of Chemistry and Biochemistry and ‡Department of Chemical and Biomolecular Engineering, University of Notre Dame , Notre Dame, Indiana 46556, United States
| | - Paul W Bohn
- Department of Chemistry and Biochemistry and ‡Department of Chemical and Biomolecular Engineering, University of Notre Dame , Notre Dame, Indiana 46556, United States
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21
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22
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Ag/α-Fe2O3 hollow microspheres: Preparation and application for hydrogen peroxide detection. J SOLID STATE CHEM 2015. [DOI: 10.1016/j.jssc.2015.06.031] [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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23
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Ma C, Zaino Iii LP, Bohn PW. Self-induced redox cycling coupled luminescence on nanopore recessed disk-multiscale bipolar electrodes. Chem Sci 2015; 6:3173-3179. [PMID: 28706689 PMCID: PMC5490416 DOI: 10.1039/c5sc00433k] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 03/19/2015] [Indexed: 11/21/2022] Open
Abstract
We present a new configuration for coupling fluorescence microscopy and voltammetry using self-induced redox cycling for ultrasensitive electrochemical measurements. An array of nanopores, each supporting a recessed disk electrode separated by 100 nm in depth from a planar multiscale bipolar top electrode, was fabricated using multilayer deposition, nanosphere lithography, and reactive-ion etching. Self-induced redox cycling was induced on the disk electrode producing ∼30× current amplification, which was independently confirmed by measuring induced electrogenerated chemiluminescence from Ru(bpy)32/3+/tri-n-propylamine on the floating bipolar electrode. In this design, redox cycling occurs between the recessed disk and the top planar portion of a macroscopic thin film bipolar electrode in each nanopore. Electron transfer also occurs on a remote (mm-distance) portion of the planar bipolar electrode to maintain electroneutrality. This couples the electrochemical reactions of the target redox pair in the nanopore array with a reporter, such as a potential-switchable fluorescent indicator, in the cell at the distal end of the bipolar electrode. Oxidation or reduction of reversible analytes on the disk electrodes were accompanied by reduction or oxidation, respectively, on the nanopore portion of the bipolar electrode and then monitored by the accompanying oxidation of dihydroresorufin or reduction of resorufin at the remote end of the bipolar electrode, respectively. In both cases, changes in fluorescence intensity were triggered by the reaction of the target couple on the disk electrode, while recovery was largely governed by diffusion of the fluorescent indicator. Reduction of 1 nM of Ru(NH3)63+ on the nanoelectrode array was detected by monitoring the fluorescence intensity of resorufin, demonstrating high sensitivity fluorescence-mediated electrochemical sensing coupled to self-induced redox cycling.
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Affiliation(s)
- Chaoxiong Ma
- Department of Chemistry and Biochemistry , University of Notre Dame , Notre Dame , IN 46556 , USA .
| | - Lawrence P Zaino Iii
- Department of Chemistry and Biochemistry , University of Notre Dame , Notre Dame , IN 46556 , USA .
| | - Paul W Bohn
- Department of Chemistry and Biochemistry , University of Notre Dame , Notre Dame , IN 46556 , USA .
- Department of Chemical and Biomolecular Engineering , University of Notre Dame , Notre Dame , IN 46556 , USA
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24
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25
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Hu M, Fritsch I. Redox Cycling Behavior of Individual and Binary Mixtures of Catecholamines at Gold Microband Electrode Arrays. Anal Chem 2015; 87:2029-32. [DOI: 10.1021/ac5042022] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Mengjia Hu
- Department
of Chemistry and
Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Ingrid Fritsch
- Department
of Chemistry and
Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
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26
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Yuan X, Zhang Y, Yang L, Deng W, Tan Y, Ma M, Xie Q. Three-dimensional activated graphene network–sulfonate-terminated polymer nanocomposite as a new electrode material for the sensitive determination of dopamine and heavy metal ions. Analyst 2015; 140:1647-54. [DOI: 10.1039/c4an02263g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A 3D activated graphene network–sulfonate-terminated polymer nanocomposite was used for the sensitive determination of dopamine and heavy metal ions.
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Affiliation(s)
- Xiaoyan Yuan
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China)
- College of Chemistry and Chemical Engineering
- Hunan Normal University
- Changsha 410081
- China
| | - Yijia Zhang
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China)
- College of Chemistry and Chemical Engineering
- Hunan Normal University
- Changsha 410081
- China
| | - Lu Yang
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China)
- College of Chemistry and Chemical Engineering
- Hunan Normal University
- Changsha 410081
- China
| | - Wenfang Deng
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China)
- College of Chemistry and Chemical Engineering
- Hunan Normal University
- Changsha 410081
- China
| | - Yueming Tan
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China)
- College of Chemistry and Chemical Engineering
- Hunan Normal University
- Changsha 410081
- China
| | - Ming Ma
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China)
- College of Chemistry and Chemical Engineering
- Hunan Normal University
- Changsha 410081
- China
| | - Qingji Xie
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China)
- College of Chemistry and Chemical Engineering
- Hunan Normal University
- Changsha 410081
- China
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27
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Liu Y, Yao Q, Zhang X, Li M, Zhu A, Shi G. Development of gold nanoparticle-sheathed glass capillary nanoelectrodes for sensitive detection of cerebral dopamine. Biosens Bioelectron 2015; 63:262-268. [DOI: 10.1016/j.bios.2014.07.040] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Revised: 07/11/2014] [Accepted: 07/14/2014] [Indexed: 11/16/2022]
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28
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Krause KJ, Kätelhön E, Lemay SG, Compton RG, Wolfrum B. Sensing with nanopores--the influence of asymmetric blocking on electrochemical redox cycling current. Analyst 2014; 139:5499-503. [PMID: 25237677 DOI: 10.1039/c4an01401d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nanoporous redox cycling devices are highly efficient tools for the electrochemical sensing of redox-active molecules. By using a redox-active mediator, this concept can be exploited for the detection of molecular binding events via blocking of the redox cycling current within the nanopores. Here, we investigate the influence of different blocking scenarios inside a nanopore on the resulting redox cycling current. Our analysis is based on random walk simulations and finite element calculations. We distinguish between symmetric and asymmetric pore blocking and show that the current decrease is more pronounced in the case of asymmetric blocking reflecting the diffusion-driven pathway of the redox-active molecules. Using random walk simulations, we further study the impact of pore blocking in the frequency domain and identify relevant features of the power spectral density, which are of particular interest for sensing applications based on fluctuation analysis.
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Affiliation(s)
- Kay J Krause
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA-Fundamentals of Future Information Technology, Forschungszentrum Jülich, 52425 Jülich, Germany.
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29
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Shan X, Fang Y, Wang S, Guan Y, Chen HY, Tao N. Detection of charges and molecules with self-assembled nano-oscillators. NANO LETTERS 2014; 14:4151-7. [PMID: 24942903 DOI: 10.1021/nl501805e] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Detection of a single or small amount of charges and molecules in biologically relevant aqueous solutions is a long-standing goal in analytical science and detection technology. Here we report on self-assembled nano-oscillators for charge and molecular binding detections in aqueous solutions. Each nano-oscillator consists of a nanoparticle linked to a solid surface via a molecular tether. By applying an oscillating electric field normal to the surface, the nanoparticles oscillate, which is detected individually with ∼0.1 nm accuracy by a plasmonic imaging technique. From the oscillation amplitude and phase, the charge of the nanoparticles is determined with a detection limit of ∼0.18 electron charges along with the charge polarity. We further demonstrate the detection of molecular binding with the self-assembled nano-oscillators.
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Affiliation(s)
- Xiaonan Shan
- Center for Bioelectronics and Biosensors, Biodesign Institute, Arizona State University , Tempe, Arizona 85287, United States
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30
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Kätelhön E, Krause KJ, Mathwig K, Lemay SG, Wolfrum B. Noise phenomena caused by reversible adsorption in nanoscale electrochemical devices. ACS NANO 2014; 8:4924-4930. [PMID: 24694343 DOI: 10.1021/nn500941g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We theoretically investigate reversible adsorption in electrochemical devices on a molecular level. To this end, a computational framework is introduced, which is based on 3D random walks including probabilities for adsorption and desorption events at surfaces. We demonstrate that this approach can be used to investigate adsorption phenomena in electrochemical sensors by analyzing experimental noise spectra of a nanofluidic redox cycling device. The evaluation of simulated and experimental results reveals an upper limit for the average adsorption time of ferrocene dimethanol of ∼200 μs. We apply our model to predict current noise spectra of further electrochemical experiments based on interdigitated arrays and scanning electrochemical microscopy. Since the spectra strongly depend on the molecular adsorption characteristics of the detected analyte, we can suggest key indicators of adsorption phenomena in noise spectroscopy depending on the geometric aspect of the experimental setup.
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Affiliation(s)
- Enno Kätelhön
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA-Fundamentals of Future Information Technology, Forschungszentrum Jülich , 52425 Jülich, Germany
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31
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Ma C, Contento NM, Bohn PW. Redox Cycling on Recessed Ring-Disk Nanoelectrode Arrays in the Absence of Supporting Electrolyte. J Am Chem Soc 2014; 136:7225-8. [DOI: 10.1021/ja502052s] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chaoxiong Ma
- Department
of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Nicholas M. Contento
- Department
of Chemical and Biomolecular Engineering, University of Notre Dame, Notre
Dame, Indiana 46556, United States
| | - Paul W. Bohn
- Department
of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
- Department
of Chemical and Biomolecular Engineering, University of Notre Dame, Notre
Dame, Indiana 46556, United States
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32
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Zhu F, Yan J, Pang S, Zhou Y, Mao B, Oleinick A, Svir I, Amatore C. Strategy for Increasing the Electrode Density of Microelectrode Arrays by Utilizing Bipolar Behavior of a Metallic Film. Anal Chem 2014; 86:3138-45. [DOI: 10.1021/ac404202p] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Feng Zhu
- State Key Laboratory
for Physical Chemistry of Solid Surfaces, and Department
of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, People’s Republic of China
| | - Jiawei Yan
- State Key Laboratory
for Physical Chemistry of Solid Surfaces, and Department
of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, People’s Republic of China
| | | | - Yongliang Zhou
- State Key Laboratory
for Physical Chemistry of Solid Surfaces, and Department
of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, People’s Republic of China
| | - Bingwei Mao
- State Key Laboratory
for Physical Chemistry of Solid Surfaces, and Department
of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, People’s Republic of China
| | - Alexander Oleinick
- CNRS UMR 8640
“PASTEUR”, Departement de Chimie, Ecole Normale Superieure, 24 rue Lhomond, Paris 75005, France
| | - Irina Svir
- CNRS UMR 8640
“PASTEUR”, Departement de Chimie, Ecole Normale Superieure, 24 rue Lhomond, Paris 75005, France
| | - Christian Amatore
- CNRS UMR 8640
“PASTEUR”, Departement de Chimie, Ecole Normale Superieure, 24 rue Lhomond, Paris 75005, France
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33
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Hüske M, Stockmann R, Offenhäusser A, Wolfrum B. Redox cycling in nanoporous electrochemical devices. NANOSCALE 2014; 6:589-598. [PMID: 24247480 DOI: 10.1039/c3nr03818a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Nanoscale redox cycling is a powerful technique for detecting electrochemically active molecules, based on fast repetitive oxidation and reduction reactions. An ideal implementation of redox cycling sensors can be realized by nanoporous dual-electrode systems in easily accessible and scalable geometries. Here, we introduce a multi-electrode array device with highly efficient nanoporous redox cycling sensors. Each of the sensors holds up to 209,000 well defined nanopores with minimal pore radii of less than 40 nm and an electrode separation of ~100 nm. We demonstrate the efficiency of the nanopore array by screening a large concentration range over three orders of magnitude with area-specific sensitivities of up to 81.0 mA (cm(-2) mM(-1)) for the redox-active probe ferrocene dimethanol. Furthermore, due to the specific geometry of the material, reaction kinetics has a unique potential-dependent impact on the signal characteristics. As a result, redox cycling experiments in the nanoporous structure allow studies on heterogeneous electron transfer reactions revealing a surprisingly asymmetric transfer coefficient.
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Affiliation(s)
- Martin Hüske
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA-Fundamentals of Future Information Technology, Forschungszentrum Jülich, D-52425 Jülich, Germany.
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34
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Hüske M, Offenhäusser A, Wolfrum B. Nanoporous dual-electrodes with millimetre extensions: parallelized fabrication and area effects on redox cycling. Phys Chem Chem Phys 2014; 16:11609-16. [DOI: 10.1039/c4cp01027b] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel fabrication techniques lead to highly sensitive electrochemical sensors (left). The large-area characteristics of redox-cycling within the sensor's nanopores further cause potential-dependent variations of the overall analyte concentration (right).
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Affiliation(s)
- Martin Hüske
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA—Fundamentals of Future Information Technology
- For-schungszentrum Jülich
- D-52425 Jülich, Germany
| | - Andreas Offenhäusser
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA—Fundamentals of Future Information Technology
- For-schungszentrum Jülich
- D-52425 Jülich, Germany
- IV. Institute of Physics
- RWTH Aachen University
| | - Bernhard Wolfrum
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA—Fundamentals of Future Information Technology
- For-schungszentrum Jülich
- D-52425 Jülich, Germany
- IV. Institute of Physics
- RWTH Aachen University
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