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A Supra-monolayer Nanopattern for Organic Nanoparticle Array Deposition
journal contribution
posted on 2013-04-10, 00:00 authored by Sunxi Wang, Daniel J. Sobczynski, Pedram Jahanian, Juxhin Xhahysa, Guangzhao MaoNanopatterns
have applications in many areas including sensors,
optoelectronics, and crystallization screening. Particle lithography
is a convenient method to manufacture nanoring nanopatterns based
on organosilane surface chemistry. The pattern thickness is generally
limited to the monolayer thickness. This work is focused on the chemical
vapor deposition conditions that yield nanopatterns with multilayer
thickness. The supra-monolayer n-octadecyltrichlorosilane (OTS) nanoring
patterns are made using polystyrene particle lithography. The supra-monolayer
nanopatterns are used as “nano-flasks” to deposit and
nucleate nanoparticles of small organic molecules including n-docosane, aspirin, and clarithromycin. The supra-monolayer
OTS nanopattern is an effective template for nanoparticle array deposition
of all three chemicals with high degree of fidelity to the substrate
pattern. The nanoparticle size is varied by solution concentration.
The preferential deposition of the organic molecules inside the nanoring
is attributed to the dewetting of the liquid film on the nanopattern.
The dewetting process effectively distributes the liquid film among
the “nano-flasks” so that millions of solution experiments
can be carried out in isolated droplets with droplet volume as small
as 1 × 10–10 nL. The research demonstrates
a method to manufacture “nano-flask”
arrays for high-throughput nanoparticle deposition trials and manufacture
of monodisperse organic/drug nanoparticles through self-assembly.
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Keywords
crystallization screeningnanoring patternsnucleate nanoparticlessolution experimentsdroplet volumeOrganic Nanoparticle Array DepositionNanopatternspolystyrene particle lithographynanoparticle sizeParticle lithographysolution concentrationorganosilane surface chemistrymethodmonolayer thicknesspattern thicknesssubstrate patternchemical vapor deposition conditionsnanoparticle array depositionfilmdewetting processmoleculenanoring nanopatternsOTS
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