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Shedding Light on the Crystallographic Etching of Multi-Layer Graphene at the Atomic Scale

Nano Research 2009年第9期2卷 695-705页

作者： Franziska Schäffel Jamie H.Warner Alicja Bachmatiuk Bernd Rellinghaus Bernd Büchner Ludwig Schultz Mark H.Rümmeli IFW Dresden P.O.Box 270116D-01171 DresdenGermany Department of Materials University of OxfordParks Rd.Oxford OX13PHUnited Kingdom

The controlled etching of graphite and graphene by catalytic hydrogenation is potentially a key engineering route for the fabrication of graphene nanoribbons with atomic *** hydrogenation mechanism,though,remains poorly *** this study we exploit the benefi ts of aberration-corrected high-resolution transmission electron microscopy to gain insight to the hydrogenation *** etch tracks are found to be commensurate with the graphite *** particles at the head of an etch channel are shown to be faceted and the angles between facets are multiples of 30°.Thus,the angles between facets are also commensurate with the graphite *** addition,the results of a post-annealing step suggest that all catalyst particles even if they are not involved in etching are actively forming methane during the hydrogenation ***,the data point against carbon dissolution being a key mechanism during the hydrogenation process.

关键词： Graphene graphene nanoribbons catalytic hydrogenation nanoparticles

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Experimental proof of Joule heating-induced switched-back regions in OLEDs

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Light(Science & Applications) 2020年第1期9卷 1951-1960页

作者： Anton Kirch Axel Fischer Matthias Liero Jurgen Fuhrmann Annegret Glitzky Sebastian Reineke Dresden Integrated Center for Applied Physics and Photonic Materials(IAPP)and Institute of Applied Physics Technische Universitat DresdenNothnitzer StraBe 6101187 DresdenGermany Weierstrass Institute Berlin MohrenstraBe 3910117 BerlinGermany

Organic light-emitting diodes(OLEDs)have become a major pixel technology in the display sector,with products spanning the entire range of current panel *** ability to freely scale the active area to large and random surfaces paired with flexible substrates provides additional application scenarios for OLEDs in the general lighting,automotive,and signage *** applications require higher brightness and,thus,current density operation compared to the specifications needed for general *** extended transparent electrodes pose a significant ohmic resistance,OLEDs suffering from Joule self-heating exhibit spatial inhomogeneities in electrical potential,current density,and hence *** this article,we provide experimental proof of the theoretical prediction that OLEDs will display regions of decreasing luminance with increasing driving *** a two-dimensional OLED model,we can conclude that these regions are switched back locally in voltage as well as current due to insufficient lateral thermal ***,we demonstrate this effect in lab-scale devices and derive that it becomes more severe with increasing pixel size,which implies its significance for large-area,high-brightness use cases of ***,these non-linear switching effects cannot be ignored with respect to the long-term operation and stability of OLEDs;in particular,they might be important for the understanding of sudden-death scenarios.

关键词： OLEDs switched proof

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Enhanced π-π Interactions Between a C_(60) Fullerene and a Buckle Bend on a Double-Walled Carbon Nanotube

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Nano Research 2010年第2期3卷 92-97页

作者： Sandeep Gorantla Stanislav Avdoshenko Felix Börrnert Alicja Bachmatiuk Maria Dimitrakopoulou Franziska Schäffel Ronny Schönfelder Jürgen Thomas Thomas Gemming Jamie HWarner Gianaurelio Cuniberti Jürgen Eckert Bernd Büchner Mark H.Rümmeli IFW Dresden P.O.Box 270116D-01171 DresdenGermany Institute for Materials Science and Max Bergmann Center of Biomaterials Dresden University of TechnologyDresden 01062Germany Department of Materials University of OxfordParks Rd.Oxford OX13PHUnited Kingdom

In situ low-voltage aberration corrected transmission electron microscopy(TEM)observations of the dynamic entrapment of a C_(60) molecule in the saddle of a bent double-walled carbon nanotube is *** fullerene interaction is non-covalent,suggesting that enhancedπ-πinteractions(van der Waals forces)are *** molecular dynamics calculations confirm that the increased interaction area associated with a buckle is sufficient to trap a ***,they show hopping behavior in agreement with our experimental *** findings further our understanding of carbon nanostructure interactions,which are important in the rapidly developing field of low-voltage aberration corrected TEM and nano-carbon device fabrication.

关键词： Carbon nanotubes fullerenes low-voltage transmission electron microscopy molecule trap

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