10.1021/acs.langmuir.6b03211.s001
Mahmoud A. Mahmoud
Mahmoud A.
Mahmoud
Silver Nanodisk Monolayers with Surface Coverage Gradients
for Use as Optical Rulers and Protractors
American Chemical Society
2016
CDG assembly
Localized surface plasmon resonance
Silver Nanodisk Monolayers
Protractors Colloidal silver nanodisks
CDG AgND arrays
Surface Coverage Gradients
2 D aggregates
CDG AgND monolayers
deposition surface pressure
Optical Rulers
LSPR peak position
HCS
2 D arrays
coverage density gradient
shift increases
separation distances
peak intensity
CDG AgND monolayer
separation distance
substrates causes
Well-separated AgNDs
LSPR spectrum
LB monolayer assembly
coverage spot
LB monolayers
2016-10-11 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Silver_Nanodisk_Monolayers_with_Surface_Coverage_Gradients_for_Use_as_Optical_Rulers_and_Protractors/4037307
Colloidal 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 polyÂ(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.