EAN: 9783319125343

SPRINGERBRIEFS IN MATERIALS METALLIC BUTTERFL...

This book presents a method for replicating natural butterfly wing scales using a variety of
metals for state-of-the-art applications requiring high surface-enhancement properties. During
the past decade  three dimensional (3D) sub-micrometer structures have attracted considerable
attention for optical applications. These 3D subwavelength metallic structures are  however 
difficult to prepare. By contrast  the 3D superstructures of butterfly wing scales  with more
than 175 000 morphologies  are efficiently engineered by nature. Natural butterfly wing scales
feature 3D sub-micrometer structures that are superior to many human designs in terms of
structural complexity  reproducibility  and cost. Such natural wealth offers a versatile
chemical route via the replication of these structures into functional metals. A single
versatile chemical route can be used to produce butterfly scales in seven different metals.
These synthesized structures have the potential for catalytic (Au  Pt  Pd)  thermal (Ag  Au 
Cu)  electrical (Au  Cu  Ag)  magnetic (Co  Ni)  and optical (Au  Ag  Cu) applications.
Plasmon-active Au  Cu  Ag butterfly scales have exhibited excellent properties in
surface-enhanced Raman scattering (SERS). The Au scales as SERS substrates have ten times the
analyte detection sensitivity and are one-tenth the cost of their human-designed commercial
counterparts (KlariteTM). Preliminary mechanisms of these surface-enhancement phenomena are
also reviewed.

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