la6b03211_si_001.pdf (3.98 MB)
Silver Nanodisk Monolayers with Surface Coverage Gradients for Use as Optical Rulers and Protractors
journal contribution
posted on 2016-10-11, 00:00 authored by Mahmoud A. MahmoudColloidal silver nanodisks (AgNDs)
are assembled into a monolayer with a coverage density gradient (CDG)
on the surface of flat and cylindrical substrates using the Langmuir–Blodgett
(LB) technique. Compressing the LB monolayers during transfer to the
substrates causes the CDG assembly of the AgNDs. By functionalizing
the AgNDs with poly(ethylene glycol), it is possible to control their
order inside the LB monolayer assembly by changing the deposition
surface pressure. Well-separated AgNDs, 2D aggregates with different
numbers of particles, and highly packed 2D arrays are formed as the
deposition surface pressure is increased. Localized surface plasmon
resonance (LSPR) spectra collected at different separation distances
from the highest coverage spot (HCS) of the CDG AgND arrays on a flat
substrate are blue-shifted, and the shift increases systematically
upon increasing the distance. The relationship among the LSPR peak
position, the peak intensity at a fixed wavelength, and the corresponding
separation distance from the HCS is fitted exponentially. A similar
systematic blue shift in the LSPR spectrum of the CDG AgND monolayer
on a cylindrical substrate is obtained when the substrate is rotated
at different angles relative to the HCS. The fabricated CDG AgND monolayers
can potentially be used for optically measuring distances and angles.
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Keywords
CDG assemblyLocalized surface plasmon resonanceSilver Nanodisk MonolayersProtractors Colloidal silver nanodisksCDG AgND arraysSurface Coverage Gradients2 D aggregatesCDG AgND monolayersdeposition surface pressureOptical RulersLSPR peak positionHCS2 D arrayscoverage density gradientshift increasesseparation distancespeak intensityCDG AgND monolayerseparation distancesubstrates causesWell-separated AgNDsLSPR spectrumLB monolayer assemblycoverage spotLB monolayers
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