Reduction
of CuO Butterfly Wing Scales Generates Cu SERS Substrates for DNA
Base Detection
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Abstract
We prepare three-dimensional Cu plasmonic
structures via a reduction of CuO photonic crystals replicated from
butterfly wing scales. These Cu superstructures with high purity provide
surface-enhanced Raman scattering (SERS) substrates for the label-free
detection of DNA bases down to a micromolar level, which is achieved
for the first time on Cu and even comparable to the detection-sensitivity
for DNA bases on some Ag substrates. The generation of such superstructures
has provided a substantial step for the biotemplated SERS substrates
with high sensitivity, high reproducibility, and ultra-low cost to
detect biomolecules, and presented affordable high-quality routine
SERS consumables for corresponding biolaboratories