title: Preparation and electrical properties of cobalt-platinum nanoparticle monolayers deposited by the Langmuir-Blodgett technique.
abstract: 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 nanoparticle's surface must be minimized, the dipping angle must be around 105 degrees , 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.
authors.affiliation: Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146, Germany.
authors.forename: Vesna
authors.initials: V
authors.lastname: Aleksandrovic
authors.forename: Denis
authors.initials: D
authors.lastname: Greshnykh
authors.forename: Igor
authors.initials: I
authors.lastname: Randjelovic
authors.forename: Andreas
authors.initials: A
authors.lastname: Frömsdorf
authors.forename: Andreas
authors.initials: A
authors.lastname: Kornowski
authors.forename: Stephan Volkher
authors.initials: SV
authors.lastname: Roth
authors.forename: Christian
authors.initials: C
authors.lastname: Klinke
authors.forename: Horst
authors.initials: H
authors.lastname: Weller
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D004553:Electric Conductivity; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008567:Membranes, Artificial; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D010984:Platinum / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D008567:Membranes, Artificial; D003035:Cobalt; D010984:Platinum