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Electrochemical Roughening of Thin-Film Platinum Macro and Microelectrodes
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Structural characterization of platinum foil for neural stimulating electrodes
Polona Pečlin1, Milan Bizjak2, Samo Ribarič3
1Centre for Implantable Technology and Sensors, ITIS d. o. o. Ljubljana, Ljubljana, Republic of Slovenia.
Bio-Medical Materials and Engineering
|September 10, 2014
Summary
This study analyzed cold-rolled platinum foil for nerve cuffs. Dynamic annealing revealed resistivity changes around 280°C and significant recrystallization above 500°C, peaking at 750°C.
Area of Science:
- Materials Science
- Biomedical Engineering
Background:
- Platinum foil is crucial for manufacturing multi-electrode spiral nerve cuffs.
- Understanding its structural properties under thermal stress is essential for device performance.
Purpose of the Study:
- To investigate the structural properties of cold-rolled platinum foil.
- To correlate thermal treatment effects with material changes for nerve cuff applications.
Main Methods:
- Utilized 0.03-mm-thick, high-purity platinum foil.
- Performed resistivity measurements via 4-point probe during dynamic annealing.
- Analyzed stored energy using differential scanning calorimetry (DSC).
- Examined microstructure with optical microscopy.
Main Results:
- Observed a minor resistivity change at ~280°C, attributed to dislocation density reduction.
- Recorded a significant resistivity decrease above 500°C, peaking at ~750°C.
- DSC confirmed recrystallization between 380-800°C, with weak exothermal heat release.
Conclusions:
- Dynamic annealing alters platinum foil resistivity and microstructure.
- Recrystallization significantly impacts the material's properties, relevant for nerve cuff fabrication.
- These findings provide critical data for optimizing platinum foil processing.
