Bench-Top Method for Fabricating Glass-Sealed Nanodisk Electrodes, Glass Nanopore Electrodes, and Glass Nanopore Membranes of Controlled Size

Bench-Top Method for Fabricating Glass-Sealed Nanodisk Electrodes, Glass Nanopore Electrodes, and Glass Nanopore Membranes of Controlled Size

A simple benchtop method of fabricating glass-sealed nanometer-sized Au and Pt disk electrodes, glass nanopore electrodes, and glass nanopore membranes is reported. The synthesis of all three structures is initiated by sealing the tips of electrochemically sharpened Au and Pt microwires into glass m...

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Bibliographic Details
Published in:Analytical chemistry (Washington) Vol. 79; no. 13; pp. 4778 - 4787
Main Authors: Zhang, Bo, Galusha, Jeremy, Shiozawa, Peter G, Wang, Gangli, Bergren, Adam Johan, Jones, Ronald M, White, Ryan J, Ervin, Eric N, Cauley, Chris C, White, Henry S
Format: Journal Article
Language:English
Published: Washington, DC American Chemical Society 01-07-2007
Subjects:
Analytical chemistry
Biosensing Techniques - instrumentation
Biosensing Techniques - methods
Calcium Compounds - chemistry
Chemistry
Electric Conductivity
Electrochemical methods
Electrochemistry
Electrodes
Exact sciences and technology
Glass
Gold
Gold - chemistry
Ions
Lead - chemistry
Membranes
Membranes, Artificial
Microscopy, Atomic Force
Nanostructures - chemistry
Nanotechnology
Nanowires - chemistry
Oxides - chemistry
Platinum
Platinum - chemistry
Porosity
Sensitivity and Specificity
Sodium Hydroxide - chemistry
Transistors, Electronic
Atomic force microscopy
Gold
Membrane electrode
Glass
Voltammetry
Nanostructure
Steady state
Field effect transistor
Numerical analysis
Current measurement
Platinum
Membrane
Impedance
Disk electrode
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Summary:A simple benchtop method of fabricating glass-sealed nanometer-sized Au and Pt disk electrodes, glass nanopore electrodes, and glass nanopore membranes is reported. The synthesis of all three structures is initiated by sealing the tips of electrochemically sharpened Au and Pt microwires into glass membranes at the end of a soda lime or lead glass capillary. Pt and Au nanodisk electrodes are obtained by hand polishing using a high-input impedance metal oxide semiconductor field effect transistor (MOSFET)-based circuit to monitor the radius of the metal disk. Proper biasing of the MOSFET circuit, based on a numerical analysis of the polishing circuit impedance, allows for the reproducible fabrication of Pt disk electrodes of radii as small as 10 nm. Significantly smaller background currents in voltammetric measurements are obtained using lead glass capillaries, a consequence of the lower mobility of Pb2+ (relative to Na+) in the glass matrix. Glass nanopore electrodes and glass nanopore membranes are fabricated, respectively, by removal of part or all of the metal sealed in the glass membranes. The nanostructures are characterized by atomic force microscopy, steady-state voltammetry, and ion conductivity measurements.
Bibliography:istex:F870EC38B10F51147C2808F00E45598EFF7D1B20
ark:/67375/TPS-4QW86LG9-G
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0003-2700
1520-6882
DOI:10.1021/ac070609j