Stability of organic nanowires

Balzer, Frank; Schiek, Manuela; Wallmann, Ivonne; Schäfer, Andreas; Lützen, Arne; Rubahn, Horst‐Günter

doi:10.1117/12.893374

Cited by 6 publications

(8 citation statements)

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“…The decrease in cluster density over time is shown in Figure c. Similar effects have been observed for naphthyl end-capped thiophenes , and p -hexaphenylene. , It is believed that the clusters stem from the dewetting of the initial wetting layer. However, we did not expect the moisture-induced aging to affect our XRD studies because the wetting layer was too thin to be seen by X-rays, and the crystallography as well as the epitaxy of the nanofibers remained unchanged over time.…”

Section: Resultssupporting

confidence: 66%

“…Similar effects have been observed for, e.g., naphthyl end-capped thiophenes 23,49 and para-hexaphenylene 71,72 .…”

Section: Acs Paragon Plus Environmentsupporting

confidence: 79%

“…Such a bimodal growth has been observed for many other small organic molecules. 23,49 Note that the fibers show faceting, with the amount increasing with the fiber width. The two growth directions are centered along the grooved muscovite ⟨1 1 0⟩ g,mica direction, 50 acting as a mirror plane for the enantiomorphic fibers.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Thin Film Phase and Local Chirality of Surface-Bound MOP4 Nanofibers

et al. 2016

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Vacuum deposition of the methoxy functionalized para-quaterphenylene MOP4 on muscovite mica at elevated temperatures leads to the formation of several ten micrometer long nanofibers. As shown by X-ray diffraction and by polarized optical microscopy, the fibers are formed by lying molecules, which grow epitaxially (point-on-line coincidence) along two directions on a single muscovite domain. The crystal structure of the fibers is induced by the substrate. Molecular packing is calculated by molecular dynamics simulations. A wetting layer from lying molecules is observed by low energy electron diffraction (LEED), with a different crystal structure from that of the fibers.Transfer of the sample from vacuum to ambient conditions leads to dewetting and to the formation of clusters from lying molecules. Samples age via Ostwald ripening due to the presence of water vapor, monitored by atomic force microscopy (AFM). Fibers represent chiral organization into single-handed aggregates of both handednesses, which is not affected by aging. On a global level the sample remains achiral.

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Section: Resultssupporting

confidence: 66%

“…Similar effects have been observed for, e.g., naphthyl end-capped thiophenes 23,49 and para-hexaphenylene 71,72 .…”

Section: Acs Paragon Plus Environmentsupporting

confidence: 79%

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Thin Film Phase and Local Chirality of Surface-Bound MOP4 Nanofibers

et al. 2016

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“…Similar morphological changes of organic layers under ambient conditions have recently been observed also for naphthyl end-capped thiophenes deposited on mica. 31 …”

Section: Discussionmentioning

confidence: 99%

Initial Steps of Rubicene Film Growth on Silicon Dioxide

et al. 2013

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The film growth of the conjugated organic molecule rubicene on silicon dioxide was studied in detail. Since no structural data of the condensed material were available, we first produced high quality single crystals from solution and determined the crystal structure. This high purity material was used to prepare ultrathin films under ultrahigh vacuum conditions, by physical vapor deposition. Thermal desorption spectroscopy (TDS) was applied to delineate the adsorption and desorption kinetics. It could be shown that the initial sticking coefficient is only 0.2 ± 0.05, but the sticking coefficient increases with increasing coverage. TDS further revealed that first a closed, weakly bound bilayer develops (wetting layer), which dewets after further deposition of rubicene, leading to an island-like layer. These islands are crystalline and exhibit the same structure as the solution grown crystals. The orientation of the crystallites is with the (001) plane parallel to the substrate. A dewetting of the closed bilayer was also observed when the film was exposed to air. Furthermore, Ostwald ripening of the island-like film takes place under ambient conditions, leading to films composed of few, large crystallites. From TDS, we determined the heat of evaporation from the multilayer islands to be 1.47 eV, whereas the desorption energy from the first layer is only 1.25 eV.

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“…One of the main features of this class of material is its inherent tunability through chemical synthesis of the molecular building blocks [ 16 ], which enables the tailoring of the material properties for a specific application such as modification of the color of the luminescence output [ 17 , 18 ]. In addition, the optical and electrical properties [ 19 ] combined with low costs and fairly straight-forward processing (also on flexible substrates [ 12 ]) make these materials interesting candidates for nanoscale optoelectronic and photonic devices applications. The organic semiconductor para-hexaphenylene ( p 6P) can self-assemble into crystalline nanofibers structures that emit polarized, blue light upon UV excitation [ 20 ], and it has been shown to work as light-emitting material in organic light-emitting field-effect transistors (OLEFETs) [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Organic nanofibers integrated by transfer technique in field-effect transistor devices

et al. 2011

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The electrical properties of self-assembled organic crystalline nanofibers are studied by integrating these on fieldeffect transistor platforms using both top and bottom contact configurations. In the staggered geometries, where the nanofibers are sandwiched between the gate and the source-drain electrodes, a better electrical conduction is observed when compared to the coplanar geometry where the nanofibers are placed over the gate and the source-drain electrodes. Qualitatively different output characteristics were observed for top and bottom contact devices reflecting the significantly different contact resistances. Bottom contact devices are dominated by contact effects, while the top contact device characteristics are determined by the nanofiber bulk properties. It is found that the contact resistance is lower for crystalline nanofibers when compared to amorphous thin films. These results shed light on the charge injection and transport properties for such organic nanostructures and thus constitute a significant step forward toward a nanofiber-based light-emitting device.

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Stability of organic nanowires

Cited by 6 publications

References 0 publications

Thin Film Phase and Local Chirality of Surface-Bound MOP4 Nanofibers

Thin Film Phase and Local Chirality of Surface-Bound MOP4 Nanofibers

Initial Steps of Rubicene Film Growth on Silicon Dioxide

Organic nanofibers integrated by transfer technique in field-effect transistor devices

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