Growing low-dimensional supramolecular crystals directly from 3D particles

Eberle, Alexander; Nosek, Adrian; Büttner, Johannes; Markert, T. H.; Trixler, Frank

doi:10.1039/c6ce02348g

Cited by 6 publications

(24 citation statements)

References 47 publications

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“…Testing the applicability of OSWD for single graphene layer on a copper foil as the substrate material (refer Fig. 1) revealed similar supramolecular structures as detected on a HOPG substrate [20]. Hence, the single QAC molecules arranged themselves in onedimensional chain-like structures, leading to the coverage of the substrate surface by multiple parallel and side-by-side appearing chain-like formations.…”

Section: Replacing Qac By Dmqacmentioning

confidence: 65%

“…In this respect, having analysed HOPG samples via STM measurements over a period of several weeks (with semiconductor particles and 8CB being continuously present), no significant increase in the array dimensions could be detected over time. Further, except few results showing instable bilayer structures, no case of three-dimensional growth could be detected [20]. In this regard, an approximate energetic criterion was found to predict two-dimensional vs. three-dimensional growth under conditions of thermodynamic equilibrium [53][54]: the condition for the three-dimensional growth being Ec < Ea and the inverse being true for the two-dimensional growth.…”

Section: Triggering the Oswd Without A Catalysing Dispersing Agentmentioning

confidence: 93%

“…Further, multiple parallel and side-by-side appearing chains have been reported to form supramolecular arrays (refer Fig. 1 (b)) [19][20]. Note: the abbreviation QAC is used for quinacridone in general, usually relating to either quinacridone molecules or quinacridone adsorbate structures, whereas the term γQAC is employed for the 3D gamma polymorph of quinacridone.…”

Section: Refinement Of the Standard Sample Preparation Methods By Incomentioning

confidence: 99%

“…As an alternative approach, we hence developed the Organic Solid-Solid Wetting Deposition (OSWD) technology, an environmental friendly, cheap, up-scalable, and both, straightforward and quick to perform procedure [19][20][21][22]. The OSWD being based on the solid-solid wetting effect [23][24][25], it is the gradient of surface free energy that acts as the prime driving force behind the technology.…”

Section: Introductionmentioning

confidence: 99%

“…As a consequence, a solid-solid wetting process is triggered, detaching semiconductor molecules from the attached crystal and adsorbing them to the substrate surface. Subsequently, the adsorbed molecules assemble into supramolecular architectures, covering the substrate surface [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Doping graphene via organic solid-solid wetting deposition

Eberle

Greiner

Ivleva

et al. 2017

Carbon

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Organic Solid-Solid Wetting Deposition (OSWD) enables the fabrication of supramolecular architectures without the need for solubility or vacuum conditions. The technique is based on a process which directly generates two-dimensional monolayers from three-dimensional solid organic powders. Consequently, insoluble organic pigments and semiconductors can be made to induce monolayer self-assembly on substrate surfaces, such as graphene and carbon nanotubes, under ambient conditions. The above factuality hence opens up the potential of the OSWD for bandgap engineering applications within the context of carbon based nanoelectronics. However, the doping of graphene via OSWD has not yet been verified, primarily owing to the fact that the classical OSWD preparation procedures do not allow for the analysis via Raman spectroscopyone of the main techniques to determine graphene doping. Hence, here we describe a novel approach to induce OSWD on graphene leading to samples suitable for Raman spectroscopy. The analysis reveals peak shifts within the Raman spectrum of graphene, which are characteristics for p-type doping. Additional evidence for chemical doping is found via Scanning Tunneling Spectroscopy. The results open up a very easily applicable, low-cost, and eco-friendly way for doping graphene via commercially available organic pigments.

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Section: Replacing Qac By Dmqacmentioning

confidence: 65%

Section: Triggering the Oswd Without A Catalysing Dispersing Agentmentioning

confidence: 93%

Section: Refinement Of the Standard Sample Preparation Methods By Incomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Doping graphene via organic solid-solid wetting deposition

Eberle

Greiner

Ivleva

et al. 2017

Carbon

Self Cite

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Hydrogen-Bonded One-Dimensional Chains of Quinacridone on Ag(100) and Cu(111): The Role of Chirality and Surface Bonding

et al. 2020

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The adsorption and ordering of the prochiral molecule quinacridone (QA) on the Ag(100) and Cu(111) surfaces were studied by low energy electron diffraction and scanning tunneling microscopy. Upon adsorption, the molecules form parallel homochiral chains of flat lying molecules linked together via hydrogen bonds on both surfaces, but these chains show surface dependent significant differences concerning their lateral order. On both substrates, the chains are not thermodynamically stable, but stabilized by kinetic barriers. On the Ag(100) surface, annealing induces a phase transition to a highly ordered and heterochiral structure with a reduced density of hydrogen bonds. This loss of bonding energy is overcompensated by a stronger bonding to the substrate yielding a commensurate structure. For QA on Ag(100), we propose that during the initial chain formation and the phase transition upon annealing, the molecules can change their handedness by rotating around their long axes. In contrast, the initial chain formation and the phase transitions of QA on the Cu(111) surface appear to be subject to stronger kinetic limitations. These are explained by stronger substrate molecule interactions on Cu(111), which reduce the diffusion and the possibility for a change of handedness in comparison to QA on Ag(100). We discuss how the intermolecular hydrogen bonds, the 2D chirality, and the different chemical reactivities of the two surfaces (Ag(100), Cu(111)) influence the structural formation of QA aggregates. We compare our results to results for QA on Ag(111) reported previously by Wagner et al.

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