Preparation and electrical properties of cobalt-platinum nanoparticle monolayers deposited by the Langmuir-Blodgett technique

The Langmuir-Blodgett technique was utilized and optimized to produce closed monolayers of cobalt-platinum nanoparticles over vast areas. It is shown that sample preparation, "dipping angle", and subphase type have a strong impact on the quality of the produced films. The amount of ligands...

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Bibliographic Details
Published in:arXiv.org 2009-01
Main Authors: Aleksandrovic, Vesna, Greshnykh, Denis, Randjelovic, Igor, Frömsdorf, Andreas, Kornowski, Andreas, Roth, Stephan Volkher, Klinke, Christian, Weller, Horst
Format: Article
Language:English
Subjects:
Charge transport
Cobalt
Dipping
Direct current
Electrical properties
Langmuir-Blodgett films
Monolayers
Nanoparticles
Platinum
Scanning electron microscopy
Size distribution
X-ray scattering
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Summary:The Langmuir-Blodgett technique was utilized and optimized to produce closed monolayers of cobalt-platinum nanoparticles over vast areas. It is shown that sample preparation, "dipping angle", and subphase type have a strong impact on the quality of the produced films. The amount of ligands on the nanoparticles surface must be minimized, the dipping angle must be around 105\(^{\circ}\), while the glycol subphase is necessary to obtain nanoparticle monolayers. The achieved films were characterized by scanning electron microscopy (SEM) and grazing incidence x-ray scattering (GISAXS). The electrical properties of the deposited films were studied by direct current (DC) measurements showing a discrepancy to the variable range hopping transport from the granular metal model, and favoring the simple thermal activated charge transport. SEM, GISAXS as well as DC measurements confirm a narrow size distribution and high ordering of the deposited films.
ISSN:2331-8422
DOI:10.48550/arxiv.0901.1046