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Biofouling-Resistant Platinum Bimetallic Alloys.
Ahmed A Farghaly1,2, Rezaul K Khan3, Maryanne M Collinson3
1Advanced Photon Source , Argonne National Laboratory , Lemont , Illinois 60439-4854 , United States.
ACS Applied Materials & Interfaces
|June 16, 2018
Summary
Researchers developed a novel electrosynthesis method for creating 3D bicontinuous nanoporous platinum-based electrodes. These advanced electrodes exhibit unique microstructures and high surface areas, enabling effective electrochemical sensing in challenging biological environments.
Area of Science:
- Electrochemistry
- Materials Science
- Nanotechnology
Background:
- Fabrication of nanostructured electrodes is crucial for advanced electrochemical applications.
- Existing methods often face limitations in creating complex 3D architectures with controlled porosity.
- Platinum-based nanomaterials offer unique electrochemical properties but require sophisticated synthesis techniques.
Purpose of the Study:
- To introduce a new electrosynthetic approach for fabricating three-dimensional bicontinuous nanoporous platinum-based (3D-BC-NP-Pt(Au)) electrodes.
- To characterize the morphology, porosity, and composition of the newly developed electrodes.
- To demonstrate the electrochemical performance and biosensing capabilities of these novel electrodes.
Main Methods:
- Electrodeposition of binary Pt-Ag alloys onto gold substrates.
- Annealing and dealloying processes to form the nanoporous structure.
- Characterization using Scanning Electron Microscopy (SEM) and X-ray Photoelectron Spectroscopy (XPS).
- Electrochemical measurements to determine surface area and performance in biological media.
Main Results:
- Successful fabrication of 3D-BC-NP-Pt(Au) electrodes with a bicontinuous nanoporous gold-like microstructure (10-30 nm pores/ligaments).
- XPS analysis confirmed the formation of ternary alloys (Pt, Au, residual Ag) after processing.
- Electrochemical measurements revealed high surface area (roughness factors of 15-24).
- Demonstrated effective electrochemical measurements in biofouling solutions using a biosieving mechanism with fibrinogen and red blood cells.
Conclusions:
- The novel electrosynthetic method enables reliable fabrication of 3D bicontinuous nanoporous platinum-based electrodes.
- These electrodes possess unique nanostructures and high surface areas suitable for electrochemical sensing.
- The demonstrated biosieving capability highlights their potential for advanced biosensing applications, enriching electrochemical sensing fields.
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