Butterfly Wing–Inspired Nanotechnology - The Nanobiotechnology - page 212

50 μm

(a)

10 nm Al 2 O 3 20 nm Al 2 O 3 30 nm Al 2 O 3 40 nm Al 2 O 3

Si

O

Al

50 μm 0 1

Energy (keV)

2

(b)

(c)

200 nm

1 μm

(d)

Figure 9.5
(See companion CD for color igure.) .Alumina.replicas.of.the.butterly.wing.scales.by.atomic.layer.deposition..
(a).Optical.images.of.alumina.wing.scales.show.color.changed.from.blue.to.pink.with.the.increase.of.the.thick-
ness.of.Al 2 O3.coating..(b).SEM.image.of.the.alumina.replicas.of.the.butterly.wing.scales.on.silicon.substrates..
(c).The.energy.dispersive.x-ray.(EDX).spectrum.of.the.alumina.replica..(d).SEM.image.of.an.alumina.replicated.
scale.exhibited.the.well-preserved.lamellae.structure.of.the.original.wing.scale.template..The.broken.tip.in.the.
insert.showed.the.tubular/cylindrical.vein.structure..(Reprinted.with.permission.from.Huang,.J.,.Wang,.X.,.and.
Wang,.Z..L.,.Controlled.replication.of.butterly.wings.for.achieving.tunable.photonic.properties,. Nano Lett .,.6,.
2325-2331..Copyright.2006.American.Chemical.Society.)

(Knez.et.al..2007)..Both.the.cover.and.ground.scales.of. Morpho .butterly.have.been.replicated.
by.utilizing.the.ALD.method,.despite.the.ground.scale.having.a.higher.aspect.ratio.(Liu.
et.al..2011)..A.thin.ilm.of.Al 2 O 3 .was.deposited.on.the.butterly.wings.in.an.ALD.system.at.
80°C,.0.2.Torr.with.a.growth.rate.of.Al 2 O 3 .at.0.095.nm.per.cycle..This.demonstrated.that.the.
inorganic-organic.hybrid.structures.replicated.with.high.idelity.not.only.the.morphology.
of.the.scales,.but.also.the.homologous.iridescence.and.diffraction.property..Additionally,.
both.uncoated.and.coated.wings.show.similar.optical.features.and.hydrophobicity.that.can.
be.attributed.to.the.structures.and.not.the.chemistry.of.the.material..Similarly,.TiO 2 .wings.