Scanning electrochemical microscopy (SECM) is an electrochemical technique used to measure faradaic current changes local to the surface of a sample. The incorporation of shear force (SF) feedback in SECM enables the concurrent acquisition of topographical data of substrates along with electrochemical measurements. Contemporary SECM measurements require a redox mediator such as ferrocene methanol (FcMeOH) for electrochemical measurements; however, this could prove detrimental in the imaging of biological cells. In this article, nanoscale polypyrrole membranes doped with dodecylbenzene sulfonate (PPy(DBS)) are deposited at the tip of an ultra-microelectrode (UME) to demonstrate a novel modification of the contemporary SECM-SF imaging technique that operates in the absence of a redox mediator. The effect of distance from an insulating substrate and bulk electrolyte concentration on sensor response are examined to validate this technique as a tool for correlated topographical imaging and cation flux mapping. Varying the distance of the PPy(DBS) tipped probe from the substrate in a solution containing NaCl causes a localized change in cation concentration within the vicinity of the membrane due to hindered diffusion of ions from the bulk solution to the diffusion field. The cation transport into the membrane in close proximity to the substrate is low as compared to that in the electrolyte bulk and asymptotically approaches the bulk value at the sense length. At a constant height from the base, changing the bulk NaCl concentration from 5 mM to 10 mM increases the filling efficiency from 35% to 70%. Further, the sense length of this modified electrode in NaCl is about 440 nm which is significantly lower as compared to that of a bare electrode in ferrocene methanol (5–20 μm). It is postulated that this novel technique will be capable of producing high resolution maps of surface cation concentrations, thus having a significant impact in the field of biological imaging.
Skip Nav Destination
ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
September 28–30, 2016
Stowe, Vermont, USA
Conference Sponsors:
- Aerospace Division
ISBN:
978-0-7918-5049-7
PROCEEDINGS PAPER
Investigation of Ion Transport in Polypyrrole Modified Ultra-Microelectrodes During Scanning Electrochemical Microscopy
Vinithra Venugopal,
Vinithra Venugopal
Ohio State University, Columbus, OH
Search for other works by this author on:
Vijay Venkatesh,
Vijay Venkatesh
Ohio State University, Columbus, OH
Search for other works by this author on:
Vishnu Baba Sundaresan
Vishnu Baba Sundaresan
Ohio State University, Columbus, OH
Search for other works by this author on:
Vinithra Venugopal
Ohio State University, Columbus, OH
Vijay Venkatesh
Ohio State University, Columbus, OH
Vishnu Baba Sundaresan
Ohio State University, Columbus, OH
Paper No:
SMASIS2016-9191, V002T06A014; 7 pages
Published Online:
November 29, 2016
Citation
Venugopal, V, Venkatesh, V, & Sundaresan, VB. "Investigation of Ion Transport in Polypyrrole Modified Ultra-Microelectrodes During Scanning Electrochemical Microscopy." Proceedings of the ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. Volume 2: Modeling, Simulation and Control; Bio-Inspired Smart Materials and Systems; Energy Harvesting. Stowe, Vermont, USA. September 28–30, 2016. V002T06A014. ASME. https://doi.org/10.1115/SMASIS2016-9191
Download citation file:
11
Views
Related Proceedings Papers
Related Articles
Open Data, Models, and Codes for Vanadium Redox Batch Cell Systems: A Systems Approach Using Zero-Dimensional Models
J. Electrochem. En. Conv. Stor (February,2020)
Nanoscale Temperature Distributions Measured by Scanning Joule Expansion Microscopy
J. Heat Transfer (May,1998)
Microscale and Nanoscale Thermal Characterization Techniques
J. Electron. Packag (December,2008)
Related Chapters
Radial Delayed Hydride Cracking in Irradiated Zircaloy-2 Cladding: Advanced Characterization Techniques
Zirconium in the Nuclear Industry: 20th International Symposium
Surface Analysis and Tools
Tribology of Mechanical Systems: A Guide to Present and Future Technologies
Spice Model on High Frequency Vibration for CMUT Application
International Conference on Mechanical and Electrical Technology, 3rd, (ICMET-China 2011), Volumes 1–3