Carbon nanotubes (CNT) provide an outstanding property spectrum which can be used to improve a wide range of materials. However, the transfer of properties from the nanoscale to a macroscopic material is a limiting factor. Different approaches of functionalizing the surface of a CNT can improve the interaction with the surrounding matrix but is connected to difficult and expensive treatments, which are usually inconvenient for industrial applications. Here, a simple and eco-friendly method is presented for the oxidation of CNT, where hydrogen peroxide (H2O2) is the only chemical needed and no toxic emissions are released. Also, the extensive step of the incorporation of CNT to an epoxy matrix is simplified to an ultrasonic dispersion in the liquid hardener component. The effectiveness is proven by mechanical tests of produced CNT/CFRP and compared to a conventional processing route. The combination of those simple and cost efficient strategies can be utilized to produce multiscale composites with improved mechanical performance in an ecological and economical way.

The extensive use of perovskites as light absorbers calls for a deeper understanding of the interaction of these materials with light. Here, the evolution of the chemical and optoelectronic properties of formamidinium lead tri‐bromide (FAPbBr3) films is tracked under the soft X‐ray beam of a high‐brilliance synchrotron source by photoemission spectroscopy and micro‐photoluminescence. Two contrasting processes are at play during the irradiation. The degradation of the material manifests with the formation of Pb0 metallic clusters, loss of gaseous Br2, decrease and shift of the photoluminescence emission. The recovery of the photoluminescence signal for prolonged beam exposure times is ascribed to self‐healing of FAPbBr3, thanks to the re‐oxidation of Pb0 and migration of FA+ and Br− ions. This scenario is validated on FAPbBr3 films treated by Ar+ ion sputtering. The degradation/self‐healing effect, which is previously reported for irradiation up to the ultraviolet regime, has the potential of extending the lifetime of X‐ray detectors based on perovskites.

Controlling the edge morphology and terminations of graphene nanoribbons (GNR) allows tailoring their electronic properties and boosts their application potential. One way of making such structures is encapsulating them inside single‐walled carbon nanotubes. Despite the versatility of Raman spectroscopy to resolve strong spectral signals of these systems, discerning the response of long nanoribbons from that of any residual precursor remaining outside after synthesis has been so far elusive. Here, the terrylene dye is used as precursor to make long and ultra‐narrow armchair‐edged GNR inside nanotubes. The alignment and characteristic length of terrylene encapsulated parallel to the tube's axis facilitates the ribbon formation via polymerization, with high stability up to 750 °C when the hybrid system is kept in high vacuum. A high temperature annealing is used to remove the terrylene external molecules and a subtraction model based on the determination of a scaling factor related to the G‐band response of the system is developed. This not only represents a critical step forward toward the analysis of the nanoribbon‐nanotube system, but it is a study that enables unraveling the Raman signatures of the individual CH‐modes (the signature of edge passivation) for GNR for the first time with unprecedented detail.

We report a Kelvin-probe method to investigate the lateral charge-transport properties of semiconductors, most notably the charge-carrier mobility. The method is based on successive charging and discharging of a pre-biased metal-insulator-semiconductor stack by an alternating voltage applied to one edge of a laterally confined semiconductor layer. The charge carriers spreading along the insulator-semiconductor interface are directly measured by a Kelvin-probe, following the time evolution of the surface potential. A model is presented, describing the device response for arbitrary applied biases allowing the extraction of the lateral charge-carrier mobility from experimentally measured surface potentials. The method is tested using the organic semiconductor poly(3-hexylthiophene), and the extracted mobilities are validated through current voltage measurements on respective field-effect transistors. Our widely applicable approach enables robust measurements of the lateral charge-carrier mobility in semiconductors with weak impact from the utilized contact materials.

The synthesis of atomically precise chemically active 2D molecular overlayers may be hindered by chemical interactions with the underlying substrate, especially when based on chlorophenyl porphyrins. At the same time, the chlorination of graphene, i.e., the covalent bonding of chlorine atoms with sp 2 carbon atoms, is known to have a significant influence on the electronic properties of pristine graphene. In this study, we deposit a chlorinated porphyrin molecule, namely 5,10,15,20-tetrakis(4chlorophenyl)porphyrin (Cl 4 TPP), on graphene/Ir(111). Employing a combined experimental and theoretical approach, we demonstrate that the porphyrin layer physisorbed on graphene self-assembles into a periodic square-like arrangement. This carpetlike growth is unperturbed by the step edges of the substrate, neither in its periodicity nor in its orientation. In addition, the molecular overlayer is thermally stable and does not alter the electronic properties of graphene. Remarkably, we show that Cl 4 TPP does not experience a dechlorination reaction with the underlying substrate, even after postdeposition annealing temperatures as high as 550 K. Moreover, postdeposition annealing at 700 K suggests the Cl 4 TPP molecules desorb intact without affecting graphene's electronic properties. In so doing, we demonstrate the effectiveness of graphene physisorbed on Ir(111) to both promote the formation and preserve the properties of chemically reactive 2D overlayers based on chlorophenyl porphyrins. These results show physisorbed graphene's potential as a general templating material for the formation of highly reactive self-assembled 2D overlayers.