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Fabrication of electrical device based on gold nanoparticles: The impact of molecule separation and linkage on electrical conduction properties of gold nanoparticle assembly
This thesis presents experimental studies on nano-devices based on nanoparticles on two aspects: the processes of gold nanoparticles (AuNPs) self-assembled into nano-gaped electrodes to form nano-devices, and the electrical conduction properties for the gold nanoparticles modified by molecules of various lengths (with 3-carbon chain, 6-carbon chain, 8-carbon chain, 11-carbon chain). In the first aspect, microfluidic-channel confinement, dielectrophoresis method, and centrifugal method were employed for AuNP self-assembly. The comparison in morphology and electrical conduction of the AuNP assemblies from three methods is addressed. The centrifugal method may yield the AuNPs deposited in a closed-packed and single-layered structure. In the second aspect, the impact of AuNP-modification molecules on the electrical conduction of the AuNP assemblies obtained by the centrifugal method was studied. From the temperature-dependent resistance, the AuNP assemblies modified by short (3) carbon-chain molecules are metallic, while those modified by long (6,8, and 11) carbon-chain molecules are insulating. For the insulators, the resistance v.s. temperature curve exhibits a thermal activation behavior.
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