Nanostrukturierung von funktionellen Oberflächen mit Hilfe der Rasterkraftmikroskopie

Das Nanografting stellt eine wichtige Methode zur Erzeugung klar definierter, funktioneller Strukturen auf einer bestehenden Oberfläche dar, die den gezielten und ortsselektiven Aufbau weiterer Strukturen ermöglicht. Dieses Strukturierungsverfahren hat den Vorteil, dass die Form und die chemischen Eigenschaften von Einzelstrukturen individuell, mit einer hohen lateralen Auflösung und Ortsselektivität, variiert werden können

When Our Shell Fire Pours the Hell Fire into Pots-damn

Illustration of soldiers firing cannonshttps://scholarsjunction.msstate.edu/cht-sheet-music/5603/thumbnail.jp

Mobility of charge carriers in self-assembled monolayers

We present a new approach to study charge transport within 2D layers of organic semi-conductors (OSCs) using atomic force microscopy (AFM)-based lithography applied to self-assembled monolayers (SAMs), fabricated from appropriate organothiols. The extent of lateral charge transport was investigated by insulating pre-defined patches within OSC-based SAMs with regions of insulating SAM made from large band gap alkanethiolates. The new method is demonstrated using a phenyl-linked anthracenethiolate (PAT), 4-(anthracene-2-ylethynyl)benzyl thiolate. I-V characteristics of differently shaped PAT-islands were measured using the AFM tip as a top electrode. We were able to determine a relationship between island size and electrical conductivity, and from this dependence, we could obtain information on the lateral charge transport and charge carrier mobility within the thin OSC layers. Our study demonstrates that AFM nanografting of appropriately functionalized OSC molecules provides a suitable method to determine intrinsic mobilities of charge carriers in OSC thin films. In particular, this method is rather insensitive with regard to influence of grain boundaries and other defects, which hamper the application of conventional methods for the determination of mobilities in macroscopic samples. © 2019 Fu et al

Electrochemical deposition of zeolitic imidazolate framework electrode coatings for supercapacitor electrodes

Zn and Co electrodes have been successfully coated with five different zeolitic imidazolate frameworks ZIFs (ZIF-4, ZIF-7, ZIF-8, ZIF-14 and ZIF-67) via the anodic dissolution method. Careful control of the reaction conditions allows for electrode coating growth; in contrast to previous reports of electrochemical ZIF growth, which have not succeeded in obtaining ZIF electrode coatings. Coating crystallinity is also shown to be heavily dependent upon reaction conditions, with amorphous rather than crystalline material generated at shorter reaction times and lower linker concentrations. Electrochemical applications for ZIF-coated electrodes are highlighted with the observation of an areal capacitance of 10.45 mF cm−2 at 0.01 V s−1 for additive-free ZIF-67 coated Co electrodes. This is superior to many reported metal organic framework (MOF)/graphene composites and to capacitance values previously reported for additive-free MOFs