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Andreas Dollinger,Christoph H. Strobel,Hannes Bleuel,서현욱,박은지,김영독,Gerd Gantef€or 한국물리학회 2015 Current Applied Physics Vol.15 No.9
Mass-selected W cluster anions in the size range of 20e3500 are deposited on highly ordered pyrolytic graphite (HOPG) surfaces. The structures of resulting thin films are studied using atomic force microscopy. Clusters with more than ~600 atoms form thin films, in which the clusters are not completely merged but survive as individual species to a certain extent. The new class of materials fabricated here (cluster-assemblies) has a potential for applications in heterogeneous catalysis and in optoelectronic devices. In addition, they are interesting from the perspective of basic research.
Dollinger, A.,Strobel, C.H.,Bleuel, H.,Seo, H.O.,Park, E.J.,Kim, Y.D.,Gantefor, G. Elsevier 2015 CURRENT APPLIED PHYSICS Vol.15 No.9
Mass-selected W cluster anions in the size range of 20-3500 are deposited on highly ordered pyrolytic graphite (HOPG) surfaces. The structures of resulting thin films are studied using atomic force microscopy. Clusters with more than ~600 atoms form thin films, in which the clusters are not completely merged but survive as individual species to a certain extent. The new class of materials fabricated here (cluster-assemblies) has a potential for applications in heterogeneous catalysis and in optoelectronic devices. In addition, they are interesting from the perspective of basic research.
Thin films of size-selected Mo clusters: growth modes and structures
Dollinger, Andreas,Park, Eun Ji,Strobel, Christoph H.,Bleuel, Hannes,Marsteller, Alexander,Seo, Hyun Ook,Kim, Young Dok,Gantefö,r, Gerd The Royal Society of Chemistry 2015 Physical chemistry chemical physics Vol.17 No.32
<P>Thin films of MoO<SUB>3</SUB> were prepared by deposition of size-selected ligand-free Mo clusters under high vacuum conditions and subsequent exposure to air. The growth pattern is highly dependent on the cluster size. At low coverage, small clusters (Mo<SUB>51</SUB>) form a continuous monolayer of fused particles. On top of this monolayer, additional clusters survive as individual entities. Medium sized clusters (Mo<SUB>251</SUB> and Mo<SUB>1253</SUB>) do not coalesce and form a monolayer of clusters. Close examination using <I>in situ</I> scanning tunneling microscopy reveals a local order of the particles. At higher coverage a new pattern of large 3-dimensional aggregations of clusters (pylons) appears. The pylons are not formed under high vacuum conditions. Their formation is most likely caused by the air exposure. For the largest clusters (Mo<SUB>3349</SUB>) studied here, no monolayer is formed. Instead, the clusters are randomly distributed as expected for particles with zero mobility. These results demonstrate the high potential of cluster deposition for the production of new types of nanostructured surfaces, thin films and nanomaterials.</P> <P>Graphic Abstract</P><P>The growth pattern of film highly depends on cluster size. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5cp03147h'> </P>