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Molecular Patterning and Directed Self-Assembly of Gold Nanoparticles on GaAs
journal contribution
posted on 2017-11-15, 00:00 authored by Tianhan Liu, Timothy Keiper, Xiaolei Wang, Guang Yang, Daniel Hallinan, Jianhua Zhao, Peng XiongThe
ability to create micro-/nanopatterns of organic self-assembled monolayers
(SAMs) on semiconductor surfaces is crucial for fundamental studies
and applications in a number of emerging fields in nanoscience. Here,
we demonstrate the direct patterning of thiolate SAMs on oxide-free GaAs surface by dip-pen nanolithography (DPN) and microcontact printing
(μCP), facilitated by a process of surface etching and passivation
of the GaAs. A quantitative analysis on the molecular diffusion on
GaAs was conducted by examining the writing of nanoscale dot and line
patterns by DPN, which agrees well with surface diffusion models.
The functionality of the patterned thiol molecules was demonstrated
by directed self-assembly of gold nanoparticles (Au NPs) onto a template
of 4-aminothiophenol (ATP) SAM on GaAs. The highly selective assembly
of the Au NPs was made evident with atomic force microscopy (AFM)
and scanning electron microscopy (SEM). The ability to precisely control
the assembly of Au NPs on oxide-free semiconductor surfaces using
molecular templates may lead to an efficient bottom-up method for
the fabrication of nanoplasmonic structures.
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Keywords
dip-pen nanolithographythiol moleculesnanoscale dotSEMATPgold nanoparticlesDPNnanoplasmonic structuresself-assembled monolayersMolecular Patterningline patternstemplatesemiconductor surfacesforce microscopyoxide-free semiconductor surfacesthiolate SAMsbottom-up methodAFMassemblyability4- aminothiophenolNPscanning electron microscopyGold NanoparticlesCPsurface diffusion modelssurface etchingoxide-free GaAs surface
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