Hierarchically Driven
IrO<sub>2</sub> Nanowire Electrocatalysts
for Direct Sensing of Biomolecules
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Abstract
Applying nanoscale device fabrications toward biomolecules,
ultra
sensitive, selective, robust, and reliable chemical or biological
microsensors have been one of the most fascinating research directions
in our life science. Here we introduce hierarchically driven iridium
dioxide (IrO<sub>2</sub>) nanowires directly on a platinum (Pt) microwire,
which allows a simple fabrication of the amperometric sensor and shows
a favorable electronic property desired for sensing of hydrogen peroxide
(H<sub>2</sub>O<sub>2</sub>) and dihydronicotinamide adenine dinucleotide
(NADH) without the aid of enzymes. This rational engineering of a
nanoscale architecture based on the direct formation of the hierarchical
1-dimensional (1-D) nanostructures on an electrode can offer a useful
platform for high-performance electrochemical biosensors, enabling
the efficient, ultrasensitive detection of biologically important
molecules