Article
Chemistry, Physical
Astrid Ali, Eduardo Cisternas, Fernando Stavale, Emilia Annese
Summary: In this study, the electronic properties of a new cobalt doped Mn3O4 oxide surface were investigated using X-ray absorption and photoemission spectroscopy, as well as density functional theory calculations. The results showed that Co impurities preferentially adopted a 2+ oxidation state, replacing Mn2+ cations on tetrahedral sites and Mn3+ cations on octahedral sites. The formation of oxygen vacancies related to the formation of Co2+ in an octahedral site was directly observed. These Co dopant species could potentially affect the adsorption capability and electron transfer of the Mn3O4 surface, making it promising for catalytic applications.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Materials Science, Coatings & Films
Antoine Peisert, Noureddine Adjeroud, Damien Lenoble, Guillaume Lamblin
Summary: This study reports the successful synthesis of an electrochemically active cathodic material LixCoyOz for Li-ion batteries using a thermal atomic layer deposition process. Comprehensive characterizations and electrochemical results demonstrate the effectiveness of this method for growing lithiated materials, specifically LixCoyOz.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Materials Science, Multidisciplinary
Fatima Alarab, Karol Hricovini, Berengar Leikert, Laurent Nicolai, Mauro Fanciulli, Olivier Heckmann, Christine Richter, Lucie Prusakova, Zdenek Jansa, Pavol Sutta, Julien Rault, Patrick Lefevre, Michael Sing, Matthias Muntwiler, Ralph Claessen, Jan Minar
Summary: The electronic properties of SrTiO3 doped with Ni impurities were investigated through a combination of photoelectron spectroscopy and first-principles calculations, confirming the formation of localized 3d-impurity bands in the band gap of SrTiO3.
Article
Nanoscience & Nanotechnology
Ewa Malgorzata Nowik-Boltyk, Tobias Junghoefer, Mathias Glaser, Erika Giangrisostomi, Ruslan Ovsyannikov, Shuyang Zhang, Chan Shu, Andrzej Rajca, Arrigo Calzolari, M. Benedetta Casu
Summary: In this study, we investigate the degradation of radical thin films by comparing two Blatter radical derivatives. We find that the chemical and magnetic properties of the films are affected by interactions with different contaminants. Atomic H and NH2 negatively impact the magnetic properties of Blatter radicals, while molecular water specifically influences the magnetic properties of diradical thin films and contributes to their shorter lifetime in air.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Hamish Cavaye, Rebecca J. L. Welbourn, Jan G. Gluschke, Paul Hughes, Ky Nguyen, Adam P. Micolich, Paul Meredith, A. Bernardus Mostert
Summary: This study systematically investigated the hydration status of Nafion thin films at different relative humidities, using the reflection signals of H2O and D2O vapours to quantify the hydration layers. The number of hydration layers continuously increases with humidity, rather than forming abruptly. The results are crucial for quantifying the hydration dependence of Nafion thin films and understanding Nafion/semiconductor devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
P. Moras, T. O. Mentes, F. Schiller, L. Ferrari, D. Topwal, A. Locatelli, P. M. Sheverdyaeva, C. Carbone
Summary: The existence of a unique photoelectron reference plane for a stepped solid surface is discussed based on angle-resolved photoelectron spectroscopy data for Ag films grown on Pt(997). Different step morphologies at the surface and interface result in distinctly different band dispersions of quantum well states and the Shockley surface state. The findings illustrate the connection of the photoelectron reference plane with the local morphology of a solid surface and the spatial extent of the electron wave functions.
Article
Chemistry, Physical
Jun Wang, Jingjing Zhan, Hao Zhou, Xianliang Yi, Yang Liu
Summary: Tourmaline-LiCoO2 composites were synthesized and found to have high adsorption capacity for Pb2+. The optimal conditions for Pb2+ adsorption were determined to be 0.375 g tourmaline addition and sintering at 800 degrees C. The adsorption behavior of TM0.375LCO800 was influenced by solution pH and foreign cations, with Cu2+ and Zn2+ having the largest effect. XRD, ATR, SEM, TEM, UV-vis DRS, and XPS analysis revealed the physicochemical properties of the composites. The high-temperature transformation of tourmaline and LiCoO2 promoted Pb2+ removal. This study highlights the potential of tourmaline-LiCoO2 composites for heavy metal ion removal and provides scientific insights for future environmental applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Shengwei Yu, Liyuan Chen, Na Cheng, Jiyuan Lu, Liyuan Bi, Wenhui Zhang, Aiping Chen, Haibo Jiang, Chunzhong Li
Summary: Researchers synthesized Pt1.2Ni/C catalyst with excellent activity and long-term stability for oxygen reduction reaction (ORR), achieving a mass activity of 1.53 A/mgPt, which is 12 times higher than that of commercial Pt/C. The adsorption of abundant water on the Pt1.2Ni alloy surface weakens the adsorption of oxygen, contributing to the ORR performance.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Shuyu Cheng, M. Nrisimhamurty, Tong Zhou, Nuria Bagues, Wenyi Zhou, Alexander J. Bishop, Igor Lyalin, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, David W. McComb, Igor Zutic, Roland K. Kawakami
Summary: This article reports the band structure of epitaxial CoSn thin films grown on insulating substrates, and flat bands are observed using ARPES. The band structure is consistent with DFT calculations and the transport properties are quantitatively explained. This work paves the way for realizing flat band-induced phenomena through fine-tuning of flat bands in kagome materials.
Article
Chemistry, Physical
Diego Cortes-Arriagada
Summary: The research reveals that the complexes formed between PAH and phosphorene exhibit outstanding stability in solution due to the high polarity of the complexes and the strong overcompensation of destabilizing solvation energies with stabilizing electrostatic effects. Additionally, PAHs act as n-dopants for phosphorene, causing a small bandgap opening and weak effects on the photophysical fingerprint of phosphorene.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Multidisciplinary Sciences
E. Salagre, S. Quilez, R. de Benito, M. Jaafar, H. P. van der Meulen, E. Vasco, R. Cid, E. J. Fuller, A. A. Talin, P. Segovia, E. G. Michel, C. Polop
Summary: This study investigates the delithiation of LiCoO2 thin films using oxalic acid and identifies three different delithiation regimes and the balance between selective Li extraction and structural damage. The bulk delithiation regime is found to be effective, mimicking the behavior of electrochemical delithiation. The study suggests that the chemical route to Li extraction provides opportunities for further research on delithiation while simplifying in-situ measurements.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
B. G. A. L. Borges, M. Gioti, R. S. Correa, A. K. Andreopoulou, A. G. Veiga, A. Laskarakis, J. K. Kallitsis, S. Logothetidis, M. L. M. Rocco
Summary: Semiconducting aromatic aliphatic polyethers based on different chromophores were investigated and deposited as thin films onto PEDOT:PSS using XPS, depth-profiling XPS, and REELS techniques. The data confirmed the quality of the films and indicated an excess of PSS dopant in the Terpolymer B sample surface, possibly interfering with the backbone. Additionally, pi-plasmon peaks were derived from REELS data and optical properties and film thickness were evaluated through Spectroscopic Ellipsometry and Photoluminescence Spectroscopy.
Article
Chemistry, Physical
E. T. Jensen
Summary: The study found that methyl halides adsorbed on C6H6 and C6F6 display different photodissociation mechanisms, including neutral photodissociation and dissociative electron attachment pathways.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Yujun Zhang, Jiahui Chen, Keisuke Ikeda, Kohei Yamagami, Yue Wang, Yongseong Choi, Akira Yasui, Jing Ma, Yuanhua Lin, Cewen Nan, Hiroki Wadati
Summary: In this study, the magnetism and electronic structure changes across the AFM-FM transition of Ni-doped FeRh epitaxial thin films were investigated using XMCD and HAXPES techniques. The results showed that the remnant FM phase at low temperature possesses a smaller Rh moment than the normal FM phase, while an increase of Rh 4d density of state at the Fermi level and a possible well-screened Ni 2p state were found in the FM phase. In addition, the FM fluctuation of the inter-site Fe-Fe exchange coupling within the AFM phase was observed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Aravind Raji, Guillaume Krieger, Nathalie Viart, Daniele Preziosi, Jean-Pascal Rueff, Alexandre Gloter
Summary: The structural and charge distribution of NdNiO2 thin films with and without charge ordering (CO) are studied. The capped samples show Ni1+ and have a stabilized infinite-layer structure, while the uncapped samples exhibit an increase in the o-o-p parameter, indicating the presence of Ni2+. The results suggest a possible link between charge ordering and oxygen re-intercalation in infinite-layer nickelate thin films.
