Article
Chemistry, Physical
Xiangzhi Meng, Manh Linh Nguyen, Alexander Weismann, Chao Li, Felix Tuczek, Richard Berndt
Summary: [Mn(I)(CO)(3)(triphyrin)] was studied on Au(111) using a low-temperature scanning tunneling microscope. The complex remains intact in the adsorbed state, but the CO ligands can be selectively removed. The diamagnetic molecule gains a spin on Au(111) and exhibits spin-flip excitations. Disorder in the molecular layer causes shifts in the frontier orbitals, influencing spin-scattering rates significantly but having little impact on spin excitation energy. Removing CO ligands from the Mn center alters the low-energy excitation spectra, with lower excitation energies and the observation of a Kondo resonance when two or one CO ligand remains.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Electrochemistry
Felix M. Matzik, Johannes M. Hermann, Ludwig A. Kibler, Timo Jacob
Summary: The kinetics of surface oxidation for Au(111) in 0.1 M HCOOH + 0.1 M HClO4 was studied using the electrocatalytic formic acid oxidation reaction (FAOR). The results showed that FAOR is dependent on the scan rate, indicating the deactivation of active surface sites. The surface oxide is inactive for FAOR. A three-step surface oxidation model was proposed to explain the recorded current-time curves.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Daniela Dombrowski, Abdus Samad, Clifford Murray, Marin Petrovic, Pascal Ewen, Thomas Michely, Marko Kralj, Udo Schwingenschlogl, Carsten Busse
Summary: Monolayers of tantalum sulfide were prepared on Au(111) by evaporating Ta in a reactive background of H2S. Different structures were formed under sulfur-rich and sulfur-poor conditions, with TaS identified as a phase derived from 2H-TaS2 by removal of the bottom S layer.
Article
Chemistry, Multidisciplinary
Ana Barragan, Roberto Robles, Lucia Vitali, Nicolas Lorente
Summary: Thioether polymers are synthesized by the thermal annealing of 4-bromo-4-mercaptobiphenyl adsorbed on the surface of Au(111), forming intermolecular C-S bonds through four reaction steps involving sulfhydryl or bromine molecular functional groups. The simultaneous occurrence of dehalogenation and dissociation of the S-Au bond is necessary to overcome the competitive formation of C-C bonds. The electronic properties of the phenyl-sulfur bond and the polymer vary with the ligand length, suggesting a broader perspective for this chemical synthesis.
Article
Chemistry, Physical
John C. Thomas, Antonio Rossi, Darian Smalley, Luca Francaviglia, Zhuohang Yu, Tianyi Zhang, Shalini Kumari, Joshua A. Robinson, Mauricio Terrones, Masahiro Ishigami, Eli Rotenberg, Edward S. Barnard, Archana Raja, Ed Wong, D. Frank Ogletree, Marcus M. Noack, Alexander Weber-Bargioni
Summary: This study investigates the impact of individual atomic defects on the macroscopic functionality of 2D materials using intelligent hyperspectral scanning tunneling spectroscopy (STS) mapping. By utilizing machine learning methods, the researchers autonomously collect and analyze spectroscopic data, and provide a customizable workflow for experimental decision-making. The results demonstrate the potential of artificial intelligence in hyperspectral STS mapping.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Henrik Ostrom, Bingjie Zhang, Tiffany Vallejo, Bryn Merrill, Jeremy Huang, Jerry LaRue
Summary: Methanol decomposition on Ni(111) surfaces has been studied in the presence and absence of oxygen, revealing that both C-H and O-H bonds break to form carbon monoxide and atomic hydrogen on the surface. The presence of oxygen stabilizes the surface H atoms, leading to slightly higher desorption temperatures.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Leh-Ping Chang, Jian-Jie Wang, Fan-Yi Ouyang
Summary: This study focuses on introducing high-density nanotwinned structure into Ag films with strong (111) surface orientation. Different substrate biases were applied during the deposition process to optimize the nanostructure and properties of the films. By increasing the applied substrate bias, the formation of undesirable transition region can be suppressed. The nanotwinned (111) Ag film with moderate substrate bias shows low resistivity and high hardness.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Shijie Sun, Baijin Li, Boyu Fu, Zilin Ruan, Hui Zhang, Wei Xiong, Yong Zhang, Gefei Niu, Jianchen Lu, Xiaoqing Zuo, Lei Gao, Jinming Cai
Summary: Nanoscale low-dimensional chiral architectures have attracted increasing scientific interest due to their potential applications in chiral recognition, separation, and transformation. In this study, large-area two-dimensional chiral networks on Au(111) and one-dimensional metal-liganded chiral chains on Cu(111) were successfully constructed and characterized. The chiral transformation of the chiral networks on Au(111) was analyzed, and the electronic state information was studied using scanning tunneling spectroscopy. The combination of scanning tunneling microscopy and non-contact atomic force microscopy techniques enabled ultra-high-resolution characterization of chiral structures on low-dimensional surfaces.
CHINESE CHEMICAL LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Xiaoguo Song, Zubin Chen, Min Dan, Bin Han
Summary: Ion bombardment is a powerful method to modify the surface characteristics of materials. This study investigates the effects of Ar ion bombardment on the surface microstructure and wetting behavior of SiC ceramic. The results show that ion bombardment can generate an amorphous layer and twinning structure on the SiC surface, leading to improved bonding quality at the SiC/AgCu-Ti interface.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Ann Julie U. Holt, Sahar Pakdel, Jonathan Rodriguez-Fernandez, Yu Zhang, Davide Curcio, Zhaozong Sun, Paolo Lacovig, Yong-Xin Yao, Jeppe Lauritsen, Silvano Lizzit, Nicola Lanata, Philip Hofmann, Marco Bianchi, Charlotte E. Sanders
Summary: Through ARPES, direct measurements of the electronic dispersion of single-layer CoO2 were conducted, and the material was determined to be a moderately correlated metal. The study also discussed the effects of substrate and hydroxylation on the electronic structure of CoO2 SL.
Article
Chemistry, Physical
Osamu Endo, Fumihiko Matsui, Satoshi Kera, Wang-Jae Chun, Masashi Nakamura, Kenta Amemiya, Hiroyuki Ozaki
Summary: The geometric and electronic structures of perylene monolayers on gold single-crystal surfaces and the impact of Br doping were investigated. The study found that perylene molecules adsorbed on the Au(110)(1 x 2) surface form a monolayer with a specific orientation, while on the Au(111) surface, parallel molecular planes are observed. Additionally, the study found that doped Br can penetrate the perylene monolayer and cause a significant change in molecular orientation. Cationic perylene exhibits resonance with the singly unoccupied molecular orbital (SUMO) in the C K NEXAFS spectra.
JOURNAL OF PHYSICAL CHEMISTRY C
(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
Jakob Genser, Daniele Nazzari, Viktoria Ritter, Ole Bethge, Kenji Watanabe, Takashi Taniguchi, Emmerich Bertagnolli, Friedhelm Bechstedt, Alois Lugstein
Summary: Silicene shows promising potential for high-performance devices due to its unique electronic and optical properties, but its outstanding characteristics are not preserved on certain growth templates.
Article
Chemistry, Physical
Devaiah Damma, Aaron Welton, Punit Boolchand, Junhang Dong, Panagiotis G. Smirniotis
Summary: FeCeCoOx ferrite exhibited the best HT-WGS activity among the Ce and Cr/Co co-doped iron oxide, showing stable performance and suppression of coke formation during the reaction. Co-doping of Cr or Co into the iron oxide lattice enhanced the stability of the active magnetite phase, resulting in a high fraction of nanoparticles in the catalysts. The surface structure of the ternary spinel ferrites remained unchanged even after the reaction, contributing to the stable activity of the catalysts.
JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Physical
Xia Li, Thomas Haunold, Stefan Werkovits, Laurence D. Marks, Peter Blaha, Guenther Rupprechter
Summary: This study investigated the adsorption and dissociation of CO on perfect and defect-rich Ir(111) surfaces using various surface-analytical techniques. It was found that at high coverage, CO adsorbed ordered and tilted on the perfect surface, while on the defect-rich surface, it adsorbed less ordered and preferentially upright. The adsorption of CO was reversible under low pressure/high temperature and high pressure/low temperature conditions, but upon heating at near mbar CO pressure, irreversible modification of the surfaces occurred due to carbon deposits resulting from CO disproportionation.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Tamas Keszthelyi, Gabor Hollo, Gabriella Nyitrai, Julianna Kardos, Laszlo Heja
Article
Biochemistry & Molecular Biology
Gabriella Nyitrai, Tamas Keszthelyi, Attila Bota, Agnes Simon, Orsolya Toke, Gergo Horvath, Ildiko Pal, Julianna Kardos, Laszlo Heja
BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES
(2013)
Article
Chemistry, Medicinal
Patrizia Iavicoli, Hong Xu, Tamas Keszthelyi, Judit Telegdi, Klaus Wurst, Bernard Van Averbeke, Wojciech J. Saletra, Andrea Minoia, David Beljonne, Roberto Lazzaroni, Steven De Feyter, David B. Amabilino
Article
Chemistry, Physical
Tamas Keszthelyi, Katalin Hill, Eva Kiss
JOURNAL OF PHYSICAL CHEMISTRY B
(2013)
Article
Physics, Condensed Matter
Z. Paszti, T. Keszthelyi, O. Hakkel, L. Guczi
JOURNAL OF PHYSICS-CONDENSED MATTER
(2008)
Article
Chemistry, Physical
Katalin Hill, Csanad Botond Penzes, Donat Schnoeller, Kata Horvati, Szilvia Bosze, Ferenc Hudecz, Tamas Keszthelyi, Eva Kiss
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2010)
Article
Chemistry, Physical
Orsolya Hakkel, Zoltan Paszti, Tamas Keszthelyi, Krisztina Frey, Laszlo Guczi
REACTION KINETICS AND CATALYSIS LETTERS
(2009)
Article
Polymer Science
Eva Kiss, Tamas Keszthelyi, Gabor Kormany, Orsolya Hakkel
Article
Chemistry, Physical
T Keszthelyi, Z Pászti, T Rigó, O Hakkel, J Telegdi, L Guczi
JOURNAL OF PHYSICAL CHEMISTRY B
(2006)
Article
Chemistry, Physical
I Varga, T Keszthelyi, R Mészáros, O Hakkel, T Gilányi
JOURNAL OF PHYSICAL CHEMISTRY B
(2005)
Article
Chemistry, Physical
A Tóth, T Ujvári, I Bertóti, E Szilágyi, T Keszthelyi, A Juhász
SURFACE AND INTERFACE ANALYSIS
(2004)
Article
Chemistry, Physical
N Dam, T Keszthelyi, LK Andersen, KV Mikkelsen, PR Ogilby
JOURNAL OF PHYSICAL CHEMISTRY A
(2002)
Article
Chemistry, Multidisciplinary
JM Zwier, AM Brouwer, T Keszthelyi, G Balakrishnan, JF Offersgaard, R Wilbrandt, F Barbosa, U Buser, J Amaudrut, G Gescheidt, SF Nelsen, CD Little
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2002)
Article
Chemistry, Physical
T Keszthelyi, TD Poulsen, PR Ogilby, KV Mikkelsen
JOURNAL OF PHYSICAL CHEMISTRY A
(2000)