A TbPc₂ sub-monolayer deposit on a titanium dioxide ultrathin film: magnetic, morphological, and chemical insights

Abstract

Thin inorganic films (i.e. metal oxides) are often used as decoupling layers to optimize the interaction between magnetic layers of molecules and metallic surfaces. For deposits of Single-Molecule Magnets (SMMs),...

Unveiling the Role of PEO-Capped TiO2 Nanofiller in Stabilizing the Anode Interface in Lithium Metal Batteries

“…Figure b reports the Ti 2p XPS region for SSE before and after the cycling procedure. The fit of the Ti 2p XPS spectrum reported in Figure b shows the main contribution (wine) at 457.9 eV attributable to Ti 4+ species. − Their relative spin–orbit coupling component (Ti 2p 1/2 ) is shifted by 5.7 eV in line with previous reports. − No additional component at lower binding energy indicating the presence of Ti 3+ was found, disproving again the anatase reaction with Li . This result does not necessarily contradict what was observed in the EPR spectra taking into account the different sensitivity of the two techniques.…”

“…Shake-up components (blue lines) are present at higher binding energies (459.5 and 465.2 eV), and additional satellite features from 471.4 to 477.6 eV (dark green) are observed . The O 1s (in FigureS5a) region shows three components: the main peak located at 531.3 eV (filled in blue) corresponds to oxygen bonded with carbon species, salt, or Ti–OH bonds and a lower component at 529.4 eV (wine) corresponding to oxygen atoms bound to Ti 4+ atoms in the TiO 2 structure. − The Ti/O XPS signal ratio is about 0.6 (considering only the wine component in the O 1s region) for all samples, confirming that the expected film stoichiometry is retained even after the cycling procedure. The sulfur, as seen in Figure S5b, does not change its chemical behavior and appears as a sulfonyl .…”

Magnetic molecules as local sensors of topological hysteresis of superconductors

“…The N 1s spectrum shows the main component at 398.5 eV and a shake-up at 400.4 eV 35 – 37 . Both C 1s and N 1s have similar shapes and energies compared with signals from the massive phase and with the same molecule deposited on other surfaces 28 , 29 , 35 , 36 , indicating that the weak surface-molecule interaction does not cause significant charge transfer effects. This is at variance with what it was observed on a TiO 2 rutile single crystal where a strong surface-molecule interaction led to a marked energy shift of the N 1s and C 1s components ascribed to molecular oxidation 35 .…”

“…Remarkable effects were found in the magnetic hysteresis loop of TbPc 2 films, which is quenched for molecules directly interacting with metals while preserved or even enhanced by using decoupling layers 25 – 27 or anchoring groups 28 . Small openings of the hysteresis loop were found for TbPc 2 monolayer on TiO 2 films 29 , graphene 25 , or HOPG 30 substrates. On the other side, MgO films separating the TbPc 2 from the metal Ag(100) surface, led to large magnetic remanence and disappearance of the quantum tunnelling of the magnetisation at zero field 26 .…”

Engineering Chemisorption of Fe4 Single‐Molecule Magnets on Gold

“…However, direct contact with a metal surface was found highly detrimental to the properties of other families of SMMs, like lanthanide double-deckers. [39][40][41] By contrast, the magnetic bistability of these materials is retained on graphene [42] and on TiO 2 thin layers, [43] and is even enhanced on an Ag(100) surface covered by an ultrathin decoupling layer of MgO. [7,8] The bulky ligand shell of Fe 4 complexes, as the carbon cage of endohedral fullerenes, [5] plays a similar role by effectively shielding the magnetic core from the metallic substrate.…”