scholarly journals Direct observation of epitaxial organic film growth: temperature-dependent growth mechanisms and metastability

2015 ◽  
Vol 17 (43) ◽  
pp. 29150-29160 ◽  
Author(s):  
Helder Marchetto ◽  
Thomas Schmidt ◽  
Ullrich Groh ◽  
Florian C. Maier ◽  
Pierre L. Lévesque ◽  
...  
Keyword(s):  
Direct Observation ◽  
Growth Temperature ◽  
Film Growth ◽  
Growth Dynamics ◽  
Organic Films ◽  
Growth Mechanisms ◽  
Organic Film ◽  
Temperature Dependent ◽  
Dependent Growth

Growth dynamics and structures of organic films, and hence their properties, strongly depend on temperature and substrate morphology, as shown for the example PTCDA on Ag(111).

Temperature-dependent growth mechanisms of CaF2 on Si(111)

2004 ◽  
Vol 22 (5) ◽  
pp. 2182-2187 ◽  
Author(s):  
C. R. Wang ◽  
B. H. Müller ◽  
E. Bugiel ◽  
K. R. Hofmann
Keyword(s):  
Growth Mechanisms ◽  
Temperature Dependent ◽  
Dependent Growth

Growth and Structure of Carbide Nanorods

1995 ◽  
Vol 410 ◽  
Author(s):  
Charles M. Lieber ◽  
Eric W. Wong ◽  
Hongjie Dai ◽  
Benjamin W. Maynor ◽  
Luke D. Burns
Keyword(s):  
Carbon Nanotubes ◽  
Catalytic Mechanism ◽  
Growth Direction ◽  
Future Research ◽  
Growth Mechanisms ◽  
Temperature Dependent ◽  
Research Directions ◽  
Solid Carbide ◽  
Future Research Directions ◽  
Dependent Growth

ABSTRACTRecent research on the growth and structure of carbide nanorods is reviewed. Carbide nanorods have been prepared by reacting carbon nanotubes with volatile transition metal and main group oxides and halides. Using this approach it has been possible to obtain solid carbide nanorods of TiC, SiC, NbC, Fe3C, and BCx having diameters between 2 and 30 nm and lengths up to 20 µm. Structural studies of single crystal TiC nanorods obtained through reactions of TiO with carbon nanotubes show that the nanorods grow along both [110] and [111] directions, and that the rods can exhibit either smooth or saw-tooth morphologies. Crystalline SiC nanorods have been produced from reactions of carbon nanotubes with SiO and Si-iodine reactants. The preferred growth direction of these nanorods is [111], although at low reaction temperatures rods with [100] growth axes are also observed. The growth mechanisms leading to these novel nanomaterials have also been addressed. Temperature dependent growth studies of TiC nanorods produced using a Ti-iodine reactant have provided definitive proof for a template or topotactic growth mechanism, and furthermore, have yielded new TiC nanotube materials. Investigations of the growth of SiC nanorods show that in some cases a catalytic mechanism may also be operable. Future research directions and applications of these new carbide nanorod materials are discussed.

Impact of graphene-molecular interaction on collective orientation barrier for organic film growth

2021 ◽  
Author(s):  
Sae Nagai ◽  
Yuta Inaba ◽  
Toshio Nishi ◽  
Shigetaka Tomiya
Keyword(s):  
Temperature Regime ◽  
Molecular Interaction ◽  
Energy Barrier ◽  
Molecular Orientation ◽  
Film Growth ◽  
Organic Film ◽  
Temperature Dependent ◽  
Collective Orientation ◽  
Substrate Interaction

Abstract The temperature-dependent molecular orientation variation of pentacene (PEN) on a graphene-covered substrate (PEN/Gr) was investigated via p-polarized multiple-angle incidence resolution spectrometry (pMAIRS). The temperature regime of the orientation transition of PEN/Gr was different from that of PEN/SiO2. The collective orientation barrier (COB), an energy barrier that molecules need to overcome to form a standing orientation, was estimated via pMAIRS. Consequently, the COB of PEN/Gr was found to be 10 times larger than that of PEN/SiO2. This indicated that the COB is valuable for understanding the effect of substrate interaction on the molecular orientation.

SHAPE EVOLUTION IN ONE-DIMENSIONAL ZnO NANOSTRUCTURES GROWN FROM ZnO NANOPOWDER SOURCE: VAPOR–LIQUID–SOLID VERSUS VAPOR–SOLID GROWTH MECHANISMS

2011 ◽  
Vol 10 (01n02) ◽  
pp. 75-79 ◽  
Author(s):  
SOUMEN DHARA ◽  
P. K. GIRI
Keyword(s):  
Growth Mechanism ◽  
Growth Temperature ◽  
Shape Evolution ◽  
Zno Nanostructures ◽  
Growth Mechanisms ◽  
Vapor Liquid Solid ◽  
One Dimensional ◽  
Zno Nanopowder ◽  
Simultaneous Growth ◽  
Vapor Liquid

Here we report on the growth and evolution of ZnO nanowires grown from ZnO nanopowder as a source material using a horizontal muffle furnace. The shape evolution has been studied with variation in growth temperature and zinc vapor pressure. The structural analysis on these nanostructures shows c-axis oriented aligned growth. Scanning electron microscopy imaging of these nanostructures revealed the shape evolution from nanowires to nanoribbons and then to nanorods as the growth temperature increases from 650°C to 870°C. At 650°C, only vertical nanowires have been observed and with increase in growth temperature nanowires transform to nanoribbons and then to nanorods at 870°C. And we also observed simultaneous growth of nanorods and nanoribbons under a specific growth condition. We believe that these nanowires and nanorods were formed by vapor–liquid–solid growth mechanism (catalyst-mediated growth), whereas nanoribbons were grown by vapor–solid growth mechanism (without the aid of a metal catalyst). We observed simultaneous occurrence of vapor–liquid–solid and vapor–solid growth mechanisms at a particular growth temperature. These ZnO nanowires exhibit bound exciton related UV emission at ~379 nm, and defect-emission band in the visible region. Possible growth mechanism, shape evolution, and simultaneous growth of two types of one-dimensional ZnO nanostructures under the same growth condition are discussed.

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