Hybrid molecular graphene transistor as an operando and optoelectronic platform.

Lack of reproducibility hampers molecular devices integration into large-scale circuits. Thus, incorporating operando characterization can facilitate the understanding of multiple features producing disparities in different devices. In this work, we report the realization of hybrid molecular graphene field effect transistors (m-GFETs) based on 11-(Ferrocenyl)undecanethiol (FcCSH) micro self-assembled monolayers (μSAMs) and high-quality graphene (Gr) in a back-gated configuration.

The cobalt oxidation state in preferential CO oxidation on CoO/Pt(111) investigated by X-ray photoemission spectroscopy.

The combination of a reducible transition metal oxide and a noble metal such as Pt often leads to active low-temperature catalysts for the preferential oxidation of CO in excess H gas (PROX reaction). While CO oxidation has been investigated for such systems in model studies, the added influence of hydrogen gas, representative of PROX, remains less explored. Herein, we use ambient pressure scanning tunneling microscopy and ambient pressure X-ray photoelectron spectroscopy on a CoO/Pt(111) planar model catalyst to analyze the active phase and the adsorbed species at the CoO/Pt(111) interface under atmospheres of CO and O with a varying partial pressure of H gas.

Interaction of chiral L-dialanine with Cu(100).

We report on the properties of the thin films of the short peptide L-dialanine grown on Cu(100) surfaces and compare them to those of L-alanine by using surface techniques like XPS, IRRAS and STM. The first dialanine monolayer, in contact with the metallic substrate, is found to consist of whole neutral molecules in the non-zwitterionic state forming a (2 × 4) pattern with quasi-hexagonal symmetry. The peptide bond of dialanine is preserved in the adsorption state.