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Paschoalino WJ, Payne NA, Pessanha TM, Gateman SM, Kubota LT, Mauzeroll J. Charge Storage in Graphene Oxide: Impact of the Cation on Ion Permeability and Interfacial Capacitance. Anal Chem 2020; 92:10300-10307. [DOI: 10.1021/acs.analchem.0c00218] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Waldemir J. Paschoalino
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal H3A 0B8, Quebec, Canada
- Department of Analytical Chemistry, Institute of Chemistry, University of Campinas, P.O. Box 6154, 13084-971 Campinas, SP Brazil
| | - Nicholas A. Payne
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal H3A 0B8, Quebec, Canada
| | - Tatiana M. Pessanha
- Department of Analytical Chemistry, Institute of Chemistry, University of Campinas, P.O. Box 6154, 13084-971 Campinas, SP Brazil
| | - Samantha M. Gateman
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal H3A 0B8, Quebec, Canada
| | - Lauro T. Kubota
- Department of Analytical Chemistry, Institute of Chemistry, University of Campinas, P.O. Box 6154, 13084-971 Campinas, SP Brazil
| | - Janine Mauzeroll
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal H3A 0B8, Quebec, Canada
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2
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Venkatesh V, Heinemann C, Sundaresan VB. Surface-tracked scanning ion conductance microscopy: A novel imaging technique for measuring topography-correlated transmembrane ion transport through porous substrates. Micron 2019; 120:57-65. [PMID: 30776683 DOI: 10.1016/j.micron.2019.01.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 01/25/2019] [Accepted: 01/30/2019] [Indexed: 01/09/2023]
Abstract
Ion transport through porous substrates is ubiquitous in biological and synthetic materials, and fundamental for chemical separation, drug delivery and bio-sensing. Contemporary imaging techniques for simultaneously characterizing topography and ion transport through porous substrates are limited in range and resolution. In this paper, we demonstrate 'surface-tracked scanning ion conductance microscopy' as a technique to image topography of a porous substrate and simultaneously measure voltage-driven transmembrane ion transport. This technique uses the principles of 'shear-force tracking' to image the surface of a polycarbonate track-etch membrane, and chronoamperometry to reconstruct topography-correlated transmembrane ion transport through the membrane at different transmembrane potentials. Spatial transmembrane transport through individual pores is modeled using Goldman-Hodgkin-Katz (GHK) theory to examine the effects of shear-force modulation on magnitude of transmembrane currents recorded with a nanopipette. The modeled transmembrane current through the porous membrane is compared with experimental behavior, and discrepancies between predicted values and measured data are outlined. The proposed surface-tracked imaging mode allows for rapid assessment (approximately 7 s/μm2) of interfacial processes at the nanoscale and addresses a bottleneck for stable, large-area characterization of porous substrates using scanning ion conductance microscopy.
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Affiliation(s)
- Vijay Venkatesh
- Department of Mechanical and Aerospace Engineering, The Ohio State University, 201 W 19th Ave, Columbus, OH 43210, United States
| | - Christian Heinemann
- HEKA Elektronik Dr. Schulze GmbH, Wiesenstraße 71, Lambrecht, Pfalz, Germany
| | - Vishnu Baba Sundaresan
- Department of Mechanical and Aerospace Engineering, The Ohio State University, 201 W 19th Ave, Columbus, OH 43210, United States.
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3
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Izquierdo J, Knittel P, Kranz C. Scanning electrochemical microscopy: an analytical perspective. Anal Bioanal Chem 2017; 410:307-324. [PMID: 29214533 DOI: 10.1007/s00216-017-0742-7] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 10/16/2017] [Accepted: 11/02/2017] [Indexed: 10/18/2022]
Abstract
Scanning electrochemical microscopy (SECM) has evolved from an electrochemical specialist tool to a broadly used electroanalytical surface technique, which has experienced exciting developments for nanoscale electrochemical studies in recent years. Several companies now offer commercial instruments, and SECM has been used in a broad range of applications. SECM research is frequently interdisciplinary, bridging areas ranging from electrochemistry, nanotechnology, and materials science to biomedical research. Although SECM is considered a modern electroanalytical technique, it appears that less attention is paid to so-called analytical figures of merit, which are essential also in electroanalytical chemistry. Besides instrumental developments, this review focuses on aspects such as reliability, repeatability, and reproducibility of SECM data. The review is intended to spark discussion within the community on this topic, but also to raise awareness of the challenges faced during the evaluation of quantitative SECM data.
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Affiliation(s)
- Javier Izquierdo
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Peter Knittel
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
- Fraunhofer Institute for Applied Solid State Physics, Tullastraße 72, 79108, Freiburg, Germany
| | - Christine Kranz
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany.
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4
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Tan SY, Zhang J, Bond AM, Macpherson JV, Unwin PR. Impact of Adsorption on Scanning Electrochemical Microscopy Voltammetry and Implications for Nanogap Measurements. Anal Chem 2016; 88:3272-80. [PMID: 26877069 DOI: 10.1021/acs.analchem.5b04715] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Sze-yin Tan
- Department
of Chemistry, University of Warwick, Coventry, West Midlands CV4 7AL, United Kingdom
- School
of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Jie Zhang
- School
of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Alan M. Bond
- School
of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Julie V. Macpherson
- Department
of Chemistry, University of Warwick, Coventry, West Midlands CV4 7AL, United Kingdom
| | - Patrick R. Unwin
- Department
of Chemistry, University of Warwick, Coventry, West Midlands CV4 7AL, United Kingdom
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5
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Zhang MN, Ding Z, Long YT. Sensing cisplatin-induced permeation of single live human bladder cancer cells by scanning electrochemical microscopy. Analyst 2016; 140:6054-60. [PMID: 26194058 DOI: 10.1039/c5an01148e] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cisplatin is a widely used anti-cancer agent, which was believed to trigger apoptosis of cancer cells by forming DNA adducts. However, recent studies evidenced a cisplatin-induced extrinsic apoptotic pathway through interaction with plasma membranes. We present quantitative time-course imaging of cisplatin-induced permeation of ferrocenemethanol to single live human bladder cancer cells (T24) using scanning electrochemical microscopy (SECM). Simultaneous quantification of cellular topography and membrane permeability was realized by running SECM in the depth scan mode. It was demonstrated that the acute addition of cisplatin to the outer environment of T24 cells immediately induced membrane permeability change in 5 min, which indicated a loosened structure of the cellular membrane upon cisplatin dosage. The cisplatin-induced permeation of T24 cells might be a one-step action, an extrinsic mechanism, since the cell response was quick, and no continuous increase in the membrane permeability was observed. The time-lapse SECM depth scan method provided a simple and facile way of monitoring cisplatin-induced membrane permeability changes. Our study is anticipated to lead to a methodology of screening anti-cancer drugs through their interactions with live cells.
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Affiliation(s)
- Meng-Ni Zhang
- Department of Chemistry, The University of Western Ontario, London, ON, Canada N6A 5B7.
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6
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Zhang Z, Shi J, Huang W. Study of the ion-channel behavior on glassy carbon electrode supported bilayer lipid membranes stimulated by perchlorate anion. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 55:431-5. [PMID: 26117774 DOI: 10.1016/j.msec.2015.05.067] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 04/09/2015] [Accepted: 05/25/2015] [Indexed: 01/18/2023]
Abstract
In this paper, a kind of didodecyldimethylammonium bromide (DDAB) layer membranes was supported on a glassy carbon electrode (GCE). We studied the ion channel behavior of the supported bilayer lipid membrane by scanning electrochemical microscopy (SCEM) in tris(2,2'-bipyridine) ruthenium(II) solution. Perchlorate anion was used as a presence of stimulus and ruthenium(II) complex cations as the probing ions for the measurement of SECM, the lipid membrane channel was opened and exhibited the behavior of distinct SECM positive feedback curve. The channel was in a closed state in the absence of perchlorate anions while reflected the behavior of SECM negative feedback curve. The rates of electron transfer reaction in the lipid membranes surface were detected and it was dependant on the potential of SECM.
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Affiliation(s)
- Zhiquan Zhang
- College of Chemistry, Jilin University, Changchun 130012, People's Republic of China
| | - Jun Shi
- College of Chemistry, Jilin University, Changchun 130012, People's Republic of China
| | - Weimin Huang
- College of Chemistry, Jilin University, Changchun 130012, People's Republic of China.
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7
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Battistel D, Pecchielan G, Daniele S. Micropipette Contact Technique as a Tool to Reveal, Characterize, and Modify Nanopore Electrodes. ChemElectroChem 2013. [DOI: 10.1002/celc.201300147] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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8
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Thakar R, Weber AE, Morris CA, Baker LA. Multifunctional carbon nanoelectrodes fabricated by focused ion beam milling. Analyst 2013; 138:5973-82. [PMID: 23942511 DOI: 10.1039/c3an01216f] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
We report a strategy for fabrication of sub-micron, multifunctional carbon electrodes and application of these electrodes as probes for scanning electrochemical microscopy (SECM) and scanning ion conductance microscopy (SICM). The fabrication process utilized chemical vapor deposition of parylene, followed by thermal pyrolysis to form conductive carbon and then further deposition of parylene to form an insulation layer. To achieve well-defined electrode geometries, two methods of electrode exposure were utilized. In the first method, carbon probes were masked in polydimethylsiloxane (PDMS) to obtain a cone-shaped electrode. In the second method, the electrode area was exposed via milling with a focused ion beam (FIB) to reveal a carbon ring electrode, carbon ring/platinum disk electrode, or carbon ring/nanopore electrode. Carbon electrodes were batch fabricated (~35/batch) through the vapor deposition process and were characterized with scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), and cyclic voltammetry (CV) measurements. Additionally, Raman spectroscopy was utilized to examine the effects of Ga(+) ion implantation, a result of FIB milling. Constant-height, feedback mode SECM was performed with conical carbon electrodes and carbon ring electrodes. We demonstrate the utility of carbon ring/nanopore electrodes with SECM-SICM to simultaneously collect topography, ion current and electrochemical current images. In addition, carbon ring/nanopore electrodes were utilized in substrate generation/tip collection (SG/TC) SECM. In SG/TC SECM, localized delivery of redox molecules affords a higher resolution, than when the redox molecules are present in the bath solution. Multifunctional geometries of carbon electrode probes will find utility in electroanalytical applications, in general, and more specifically with electrochemical microscopy as discussed herein.
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Affiliation(s)
- Rahul Thakar
- Department of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, IN 47405, USA.
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McKelvey K, Nadappuram BP, Actis P, Takahashi Y, Korchev YE, Matsue T, Robinson C, Unwin PR. Fabrication, characterization, and functionalization of dual carbon electrodes as probes for scanning electrochemical microscopy (SECM). Anal Chem 2013; 85:7519-26. [PMID: 23795948 PMCID: PMC3971958 DOI: 10.1021/ac401476z] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Dual carbon electrodes (DCEs) are quickly, easily, and cheaply fabricated by depositing pyrolytic carbon into a quartz theta nanopipet. The size of DCEs can be controlled by adjusting the pulling parameters used to make the nanopipet. When operated in generation/collection (G/C) mode, the small separation between the electrodes leads to reasonable collection efficiencies of ca. 30%. A three-dimensional finite element method (FEM) simulation is developed to predict the current response of these electrodes as a means of estimating the probe geometry. Voltammetric measurements at individual electrodes combined with generation/collection measurements provide a reasonable guide to the electrode size. DCEs are employed in a scanning electrochemical microscopy (SECM) configuration, and their use for both approach curves and imaging is considered. G/C approach curve measurements are shown to be particularly sensitive to the nature of the substrate, with insulating surfaces leading to enhanced collection efficiencies, whereas conducting surfaces lead to a decrease of collection efficiency. As a proof-of-concept, DCEs are further used to locally generate an artificial electron acceptor and to follow the flux of this species and its reduced form during photosynthesis at isolated thylakoid membranes. In addition, 2-dimensional images of a single thylakoid membrane are reported and analyzed to demonstrate the high sensitivity of G/C measurements to localized surface processes. It is finally shown that individual nanometer-size electrodes can be functionalized through the selective deposition of platinum on one of the two electrodes in a DCE while leaving the other one unmodified. This provides an indication of the future versatility of this type of probe for nanoscale measurements and imaging.
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Affiliation(s)
- Kim McKelvey
- Molecular Organisation and Assembly in Cells (MOAC) Doctoral Training Centre, School of Life Sciences, University of Warwick, Coventry, UK
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11
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Lazenby RA, McKelvey K, Unwin PR. Hopping intermittent contact-scanning electrochemical microscopy (HIC-SECM): visualizing interfacial reactions and fluxes from surfaces to bulk solution. Anal Chem 2013; 85:2937-44. [PMID: 23373422 DOI: 10.1021/ac303642p] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Hopping intermittent contact-scanning electrochemical microscopy (HIC-SECM) is introduced as a powerful new technique for the quantitative visualization of redox activity and concentration at and above a surface of interest. HIC-SECM combines a hopping imaging mode, in which data are acquired at a tip as a function of distance (z) from the surface, at a series of x, y pixels across the surface, using the principles of intermittent contact to provide a nonelectrochemical means of determining when the tip and the substrate come into contact. The implementation of HIC-SECM is described, and SECM feedback measurements in three-dimensional (3D) space over a gold band array are presented. To demonstrate the generality of the methodology, flux imaging is also carried out over a Pt-disk ultramicroelectrode (UME) in the feedback mode and substrate generation/tip collection mode. The type of information that can be extracted from the data sets acquired include x-y current maps at a well-defined tip-substrate separation (parallel to the surface), x-z current maps (normal to the surface), 3D x-y-z profiles, approach curves at particular spots on the surface of interest, and surface topography. Moreover, because HIC-SECM utilizes an oscillating probe, alternating current data are also obtained that greatly enhances the information content compared to other types of electrochemical imaging. Furthermore, interfacial fluxes are ubiquitous in chemistry and allied areas, and HIC-SECM opens up the possibility of detailed flux visualization in three dimensions for many physicochemical processes.
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Affiliation(s)
- Robert A Lazenby
- Department of Chemistry, University of Warwick, Coventry, UK CV4 7AL
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12
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Guerrette JP, Percival SJ, Zhang B. Fluorescence Coupling for Direct Imaging of Electrocatalytic Heterogeneity. J Am Chem Soc 2012; 135:855-61. [DOI: 10.1021/ja310401b] [Citation(s) in RCA: 123] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Joshua P. Guerrette
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Stephen J. Percival
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Bo Zhang
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
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13
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SECM detection of single boron doped diamond nanodes and nanoelectrode arrays using phase-operated shear force technique. Electrochem commun 2012. [DOI: 10.1016/j.elecom.2012.08.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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14
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Momotenko D, Qiao L, Cortés-Salazar F, Lesch A, Wittstock G, Girault HH. Electrochemical Push–Pull Scanner with Mass Spectrometry Detection. Anal Chem 2012; 84:6630-7. [DOI: 10.1021/ac300999v] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Dmitry Momotenko
- Laboratoire d’Electrochimie
Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland
| | - Liang Qiao
- Laboratoire d’Electrochimie
Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland
| | - Fernando Cortés-Salazar
- Laboratoire d’Electrochimie
Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland
| | - Andreas Lesch
- Department of Pure and Applied
Chemistry, Faculty of Mathematics and Natural Sciences, Carl von Ossietzky University of Oldenburg, D-26111
Oldenburg, Germany
| | - Gunther Wittstock
- Department of Pure and Applied
Chemistry, Faculty of Mathematics and Natural Sciences, Carl von Ossietzky University of Oldenburg, D-26111
Oldenburg, Germany
| | - Hubert H. Girault
- Laboratoire d’Electrochimie
Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland
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Shen M, Ishimatsu R, Kim J, Amemiya S. Quantitative imaging of ion transport through single nanopores by high-resolution scanning electrochemical microscopy. J Am Chem Soc 2012; 134:9856-9. [PMID: 22655578 PMCID: PMC3380141 DOI: 10.1021/ja3023785] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Here we report on the unprecedentedly high resolution imaging of ion transport through single nanopores by scanning electrochemical microscopy (SECM). The quantitative SECM image of single nanopores allows for the determination of their structural properties, including their density, shape, and size, which are essential for understanding the permeability of the entire nanoporous membrane. Nanoscale spatial resolution was achieved by scanning a 17 nm radius pipet tip at a distance as low as 1.3 nm from a highly porous nanocrystalline silicon membrane in order to obtain the peak current response controlled by the nanopore-mediated diffusional transport of tetrabutylammonium ions to the nanopipet-supported liquid-liquid interface. A 280 nm × 500 nm image resolved 13 nanopores, which corresponds to a high density of 93 nanopores/μm(2). A finite element simulation of the SECM image was performed to assess quantitatively the spatial resolution limited by the tip diameter in resolving two adjacent pores and to determine the actual size of a nanopore, which was approximated as an elliptical cylinder with a depth of 30 nm and major and minor axes of 53 and 41 nm, respectively. These structural parameters were consistent with those determined by transmission electron microscopy, thereby confirming the reliability of quantitative SECM imaging at the nanoscale level.
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Affiliation(s)
- Mei Shen
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
| | | | - Jiyeon Kim
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
| | - Shigeru Amemiya
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
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16
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Patten HV, Meadows KE, Hutton LA, Iacobini JG, Battistel D, McKelvey K, Colburn AW, Newton ME, Macpherson JV, Unwin PR. Electrochemical Mapping Reveals Direct Correlation between Heterogeneous Electron-Transfer Kinetics and Local Density of States in Diamond Electrodes. Angew Chem Int Ed Engl 2012; 51:7002-6. [DOI: 10.1002/anie.201203057] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2012] [Indexed: 11/05/2022]
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17
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Patten HV, Meadows KE, Hutton LA, Iacobini JG, Battistel D, McKelvey K, Colburn AW, Newton ME, Macpherson JV, Unwin PR. Electrochemical Mapping Reveals Direct Correlation between Heterogeneous Electron-Transfer Kinetics and Local Density of States in Diamond Electrodes. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201203057] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Patten HV, Lai SCS, Macpherson JV, Unwin PR. Active sites for outer-sphere, inner-sphere, and complex multistage electrochemical reactions at polycrystalline boron-doped diamond electrodes (pBDD) revealed with scanning electrochemical cell microscopy (SECCM). Anal Chem 2012; 84:5427-32. [PMID: 22607491 DOI: 10.1021/ac3010555] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The local rate of heterogeneous electron transfer (HET) at polycrystalline boron-doped diamond (pBDD) electrodes has been visualized at high spatial resolution for various aqueous electrochemical reactions, using scanning electrochemical cell microscopy (SECCM), which is a technique that uses a mobile pipet-based electrochemical cell as an imaging probe. As exemplar systems, three important classes of electrode reactions have been investigated: outer-sphere (one-electron oxidation of ferrocenylmethyltrimethylammonium (FcTMA(+))), inner-sphere (one-electron oxidation of Fe(2+)), and complex processes with coupled electron transfer and chemical reactions (oxidation of serotonin). In all cases, the pattern of reactivity is similar: the entire pBDD surface is electroactive, but there are variations in activity between different crystal facets which correlate directly with differences in the local dopant level, as visualized qualitatively by field-emission scanning electron microscopy (FE-SEM). No evidence was found for enhanced activity at grain boundaries for any of the reactions. The case of serotonin oxidation is particularly interesting, as this process is known to lead to deterioration of the electrodes, because of blocking by reaction products, and therefore cannot be studied with conventional scanning electrochemical probe microscopy (SEPM) techniques. Yet, we have found this system nonproblematic to study, because the meniscus of the scanning pipet is only in contact with the surface investigated for a brief time and any blocking product is left behind as the pipet moves to a new location. Thus, SECCM opens up the possibility of investigating and visualizing much more complex heterogeneous electrode reactions than possible presently with other SEPM techniques.
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Affiliation(s)
- Hollie V Patten
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, United Kingdom
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19
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Topographical and electrochemical nanoscale imaging of living cells using voltage-switching mode scanning electrochemical microscopy. Proc Natl Acad Sci U S A 2012; 109:11540-5. [PMID: 22611191 DOI: 10.1073/pnas.1203570109] [Citation(s) in RCA: 157] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We describe voltage-switching mode scanning electrochemical microscopy (VSM-SECM), in which a single SECM tip electrode was used to acquire high-quality topographical and electrochemical images of living cells simultaneously. This was achieved by switching the applied voltage so as to change the faradaic current from a hindered diffusion feedback signal (for distance control and topographical imaging) to the electrochemical flux measurement of interest. This imaging method is robust, and a single nanoscale SECM electrode, which is simple to produce, is used for both topography and activity measurements. In order to minimize the delay at voltage switching, we used pyrolytic carbon nanoelectrodes with 6.5-100 nm radii that rapidly reached a steady-state current, typically in less than 20 ms for the largest electrodes and faster for smaller electrodes. In addition, these carbon nanoelectrodes are suitable for convoluted cell topography imaging because the RG value (ratio of overall probe diameter to active electrode diameter) is typically in the range of 1.5-3.0. We first evaluated the resolution of constant-current mode topography imaging using carbon nanoelectrodes. Next, we performed VSM-SECM measurements to visualize membrane proteins on A431 cells and to detect neurotransmitters from a PC12 cells. We also combined VSM-SECM with surface confocal microscopy to allow simultaneous fluorescence and topographical imaging. VSM-SECM opens up new opportunities in nanoscale chemical mapping at interfaces, and should find wide application in the physical and biological sciences.
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20
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Zhou Y, Chen CC, Baker LA. Heterogeneity of multiple-pore membranes investigated with ion conductance microscopy. Anal Chem 2012; 84:3003-9. [PMID: 22390616 DOI: 10.1021/ac300257q] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Heterogeneous conductance of individual pores on a porous membrane was studied with a four-electrode scanning ion conductance microscope (SICM). Application of a potential difference across the membrane resulted in migration of ions through nanopores, where subsequent conductance changes were measured by a nanopipet positioned above the nanopore as a change in pipet current. Current responses of single-pore membranes and individual pores within a multipore membrane were examined and demonstrated variations in ion current rectification (ICR) ratios due to the small differences in pore geometries.
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Affiliation(s)
- Yi Zhou
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
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21
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Snowden ME, Güell AG, Lai SCS, McKelvey K, Ebejer N, O’Connell MA, Colburn AW, Unwin PR. Scanning Electrochemical Cell Microscopy: Theory and Experiment for Quantitative High Resolution Spatially-Resolved Voltammetry and Simultaneous Ion-Conductance Measurements. Anal Chem 2012; 84:2483-91. [DOI: 10.1021/ac203195h] [Citation(s) in RCA: 176] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Michael E. Snowden
- Department
of Chemistry, and ‡MOAC Doctoral Training Centre, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Aleix G. Güell
- Department
of Chemistry, and ‡MOAC Doctoral Training Centre, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Stanley C. S. Lai
- Department
of Chemistry, and ‡MOAC Doctoral Training Centre, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Kim McKelvey
- Department
of Chemistry, and ‡MOAC Doctoral Training Centre, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Neil Ebejer
- Department
of Chemistry, and ‡MOAC Doctoral Training Centre, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Michael A. O’Connell
- Department
of Chemistry, and ‡MOAC Doctoral Training Centre, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Alexander W. Colburn
- Department
of Chemistry, and ‡MOAC Doctoral Training Centre, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Patrick R. Unwin
- Department
of Chemistry, and ‡MOAC Doctoral Training Centre, University of Warwick, Coventry CV4 7AL, United Kingdom
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