Article
Materials Science, Multidisciplinary
Sebastian Dahle, John Meuthen, Rene Gustus, Alexandra Prowald, Wolfgang Vioel, Wolfgang Maus-Friedrichs
Summary: The self-assembling films were used on pine wood substrates to alter surface wettability, with monodisperse polystyrene spheres deposited onto the substrate via dip coating. The resulting film had a polycrystalline FCC-like structure with typical domain sizes of 5-15 single spheres. Functionalization of this self-assembled coating through O-2 plasma treatment introduced hydroxyl and carbonyl groups, resulting in superhydrophilic behavior.
Article
Chemistry, Physical
Weijie Zhao, Mats Gothelid, Saman Hosseinpour, Malin B. Johansson, Gen Li, Christofer Leygraf, C. Magnus Johnson
Summary: The adsorption of octadecylphosphonic acid (ODPA) on copper substrates was studied, showing that a multilayer film was formed with increasing deposition time. The robustness of the film was attributed to the formation of Cu-ODPA complexes. Preadsorbing a monolayer of octadecylthiol (ODT) prevented the adsorption of ODPA by abolishing the release of Cu(I) ions.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Daniel Baranowski, Iulia Cojocariu, Alessandro Sala, Cristina Africh, Giovanni Comelli, Luca Schio, Massimo Tormen, Luca Floreano, Vitaliy Feyer, Claus M. Schneider
Summary: On-surface chemistry allows for the miniaturization of functional devices, with porphyrins being promising building blocks for exploring advanced nanoarchitecture. Covalently connecting molecular units can result in more stable molecular materials with improved charge transfer properties. The synthesis and properties of a covalent molecular network composed of interconnected constituents derived from halogenated nickel tetraphenylporphyrin on Au(111) are addressed in this study. The pi-extended two-dimensional material exhibits dispersive electronic features, while the functional Ni cores retain their single-active site character. The high robustness of transition metal cores provided by bottom-up constructed covalent nanomeshes opens up new possibilities.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Analytical
Sachin Shendokar, Frederick Aryeetey, Moha Feroz Hossen, Tetyana Ignatova, Shyam Aravamudhan
Summary: Molybdenum disulfide (MoS2) transistors have great potential in the semiconductor industry due to their unique properties. This research presents a lower-temperature chemical vapor deposition (CVD) method for the repeatable synthesis of large-size mono- or few-layer MoS2. The samples grown using this method demonstrate uniform single-crystalline quality and have the potential for optoelectronic applications.
Article
Materials Science, Multidisciplinary
Holger Schwarz, Thomas Uhlig, Niels Roesch, Thomas Lindner, Fabian Ganss, Olav Hellwig, Thomas Lampke, Guntram Wagner, Thomas Seyller
Summary: This study analyzed thin films deposited via magnetron sputtering from two different preparation methods of CoCrFeNi High-Entropy Alloy targets and found that their stoichiometry, phase composition, and microscopic structure were almost identical after film deposition with the same parameters.
Article
Chemistry, Multidisciplinary
Minsu Kim, Minkyun Son, Dong-Bum Seo, Jin Kim, Moonjeong Jang, Dong In Kim, Seunghun Lee, Soonmin Yim, Wooseok Song, Sung Myung, Jung-Woo Yoo, Sun Sook Lee, Ki-Seok An
Summary: This study adopts simultaneous predeposition of a metal source (MoO3) and salt (NaCl) by thermal evaporation to achieve remarkable 2D growth effects, including promoted growth, easy patterning, and potential diversity of materials. Step-by-step spectroscopy combined with morphological analyses reveals a reaction path for MoS2 growth involving the formation of Na2SO4 and Na2Mo2O7 intermediates from the separate reactions of NaCl with S and MoO3, respectively. These intermediates provide a favorable environment for 2D growth, resulting in the formation of large grains of monolayer MoS2. This study contributes to understanding the principles of salt catalysis and the evolution of CVD in the preparation of 2D TMDs.
Article
Nanoscience & Nanotechnology
Sudhir Kumar Sharma, Renu Pasricha, James Weston, Thomas Blanton, Ramesh Jagannathan
Summary: In this study, a technique to synthesize free-standing, one-atom thick 2D gold crystals (goldene) and self-assembled 2D periodic arrays of goldene was reported. The goldene exhibited unique lattice structures and magnetic properties, confirming its two-dimensionality.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
James Forsythe, Oleksandr Leiko, Vitalii Uvarov, Jan Skvara, Josef Myslivecek, Karel Masek, Viktor Johanek
Summary: Heteroepitaxial layers of ordered cobalt monoxide were prepared on single crystal Cu(111) substrate using two physical deposition methods. The structure and orientation of the CoO thin films were characterized, and the surface morphology was probed using scanning tunneling microscopy. It was found that only at low oxygen pressures could the cobalt monoxide phase be established on the Cu(111) surface.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Iris Berg, Luca Schio, Justus Reitz, Elena Molteni, Linoy Lahav, Carolina Gutierrez Bolanos, Andrea Goldoni, Cesare Grazioli, Guido Fratesi, Max M. Hansmann, Luca Floreano, Elad Gross
Summary: In this study, the self-assembly of N-heterocyclic olefins (NHOs) on gold surface was investigated using experimental and computational methods. It was found that NHOs can self-assemble into dimers, trimers, and tetramers, forming stable monolayers. The study also revealed that NHOs can adsorb on gold surface in a flat-lying geometry through coordination with gold adatoms, and the surface interaction can be further increased by functionalizing the backbone with methyl groups, leading to enhanced thermal stability and impact on work-function values.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Qiucheng Li, Xiaolong Liu, Eden B. Aklile, Shaowei Li, Mark C. Hersam
Summary: The study reports the self-assembly of mixed-dimensional lateral heterostructures consisting of 2D metallic borophene and 1D semiconducting armchair-oriented graphene nanoribbons (aGNRs). The systematic study and refinement of on-surface polymerization process from monomers to organometallic intermediates to demetallization result in borophene/aGNR lateral heterojunctions with structurally and electronically abrupt interfaces, providing insight for precise nanoelectronics.
Article
Multidisciplinary Sciences
Lutfor Rahman, Salina Rahman, Bristy Biswas, Md. Farid Ahmed, Moksodur Rahman, Nahid Sharmin
Summary: M-type strontium hexaferrite (SrM) was synthesized using co-precipitation technique with different sintering temperatures and mole ratios. The synthesized SrM was characterized and its properties were investigated. The structural parameters, particle size, and magnetic properties of the samples were found to vary with calcination temperature and composition. The synthesized SrM showed potential applications in magnetic recording media and photocatalysis due to its low coercivity, high saturation magnetization, and low band gap energy.
Article
Chemistry, Physical
Xu Li, Keito Horiba, Ryoichi Sugiura, Tomoaki Yamada, Junji Yuhara
Summary: In this study, three different precursor Ba-O films on Pt(1 1 1) were characterized and oxide crystalline approximant (OCA) and oxide quasicrystal (OQC) films were prepared via Ti deposition and annealing. Analysis revealed phase transformation likely follows Ti reduction and Ba oxidation, leading to a change in surface atomic density. Structural models proposed for the OCA and OQC films involve cluster tiling of Ba atoms.
APPLIED SURFACE SCIENCE
(2021)
Article
Biochemistry & Molecular Biology
Weronika Sofinska-Chmiel, Marta Goliszek, Marek Drewniak, Aldona Nowicka, Marcin Kusmierz, Agnieszka Adamczuk, Paulina Malinowska, Ryszard Maciejewski, Malgorzata Tatarczak-Michalewska, Eliza Blicharska
Summary: Determining the composition of kidney stones is crucial for treatment plans, understanding causes, and preventing recurrence. This study investigated the shape and chemical makeup of multicomponent kidney stones using techniques such as FTIR, XRD, and electron microscopy with the EDX detector. XPS was also used to gain a better understanding of the chemical structure, and FTIR microscopy was used for chemical mapping. This comprehensive examination of nephrolithiasis was made possible by utilizing modern research methods, particularly spectroscopic techniques.
Article
Chemistry, Physical
Sebastian Kaiser, Johanna Plansky, Matthias Krinninger, Andrey Shavorskiy, Suyun Zhu, Ueli Heiz, Friedrich Esch, Barbara A. J. Lechner
Summary: Encapsulation via strong metal-support interaction (SMSI) can overcome the sintering problem of metal nanoparticles at elevated temperatures. In this study, Pt5, Pt10, and Pt19 clusters deposited on Fe3O4(001) were encapsulated, and the stability was investigated. The encapsulated clusters could still diffuse as a whole below 823 K, suppressing atom detachment and Ostwald ripening, and resulting in square-shaped crystalline Pt particles.
Article
Chemistry, Multidisciplinary
Yoon-jeong Kim, Tae Hoon Seo, Yang Hui Kim, Eun-Kyung Suh, Sukang Bae, Jun Yeon Hwang, Jaewoo Kim, Youngjong Kang, Myung Jong Kim, Seokhoon Ahn
Summary: By introducing self-assembled alkane layers between graphene layers, nanometer size defects in graphene and lateral gas pathways can be effectively blocked. The flexible nature and strong intermolecular interactions of alkane allow it to cover defects and improve the adhesion of graphene layers. This stacked structure greatly enhances the gas-barrier property without affecting the transmittance.