
162 Biosensors Based on Nanomaterials and Nanodevices
100 nm
(vi) (vii) (viii)
(ii)
Increasing number of nanoparticles per cluster
(iii)(iv)
200 nm
Random Cluster array Stripe
FIGURE 7.2
(a) Fabrication of gold nanoparticle cluster arrays using block copolymer thin lm on a silicon or glass surface.
Representative plan-view TEM images showing gold nanoparticle clusters with systematically increasing
number of particles per cluster. (Adapted with permission from Yap, F.L., Thoniyot, P., Krishnan, S., and
Krishnamoorthy, S., Nanoparticle Cluster arrays for high-performance SERS through directed self-assembly
on at substrates and on optica ...