Article
Chemistry, Physical
Peter M. Spurgeon, Da-Jiang Liu, Theresa L. Windus, James W. Evans, Patricia A. Thiel
Summary: Chemisorbed species, particularly sulfur, can enhance the decay rate of 2D Au islands on metal surfaces, leading to surface pitting and reconstruction. The formation and diffusion of Au-S complexes contribute to the enhanced coarsening of Au islands at lower sulfur coverages.
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, Physical
H. Farrokhpour, M. Gerami
Summary: This study investigates the interaction between M@Au-12 nanoclusters and different forms of cysteine mediated by the formation of Au-S bond, considering the type of core-metal (M = Au, Ag, Pd, and Pt). The adsorption energy, adsorption mode, strength of the Au-S bond, and IR spectrum of cysteine are also considered. The results suggest that the type of core-metal atoms influences the interaction between cysteine and the core-shell nanoparticles.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Analytical
Hailin Shen, Wei Wang, Min Wang, Wei Zhang, Yuheng Zhang, Xianqiang Kong, Xiaowei Cao
Summary: The novel ITO/Au/L-Cys electrode shows high sensitivity and selectivity for detecting DA in the presence of UA, with a wide linear response range and low detection limit, making it a promising DA sensor with excellent biocompatibility.
MICROCHEMICAL JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Yuta Kataoka, Jun Haruyama, Osamu Sugino
Summary: We calculated the diffusion coefficient of hydrogen on metal surfaces using a method that combines diagonalization of the potential energy surface with transition state theory. By including quantum effects and entropy effects in the transition state theory without stochastic simulations, our method provides more accurate results. However, more sophisticated quantum mechanical schemes are needed for cryogenic temperatures.
Article
Chemistry, Multidisciplinary
Zhewen Liang, Shiru Wu, Jiamin Wang, Yifan Qin, Fang Cheng, Liang Cao, Hai Xu
Summary: In this study, a method was proposed to construct chiral metal-organic networks on Au(111) surface using PTCDA molecules and low-cost NaCl in a controllable manner. The results showed that the incorporation of Na ions disrupted intermolecular hydrogen bonds and initiated a collective sliding motion of PTCDA molecules. The chirality transfer process was disrupted when intermolecular hydrogen bonds were completely replaced by Na ions. This study provides fundamental insights into the mechanism of coordination-induced chirality and offers potential strategies for synthesizing large homochiral metal-organic networks.
Article
Chemistry, Physical
Sicheon Seong, Hungu Kang, Seulki Han, Young Ji Son, Jiung Jang, Hyo Jae Yoon, Shoichi Maeda, Subin Song, Debabrata Palai, Tomohiro Hayashi, Jaegeun Noh
Summary: The formation and surface structure of pentafluorobenzeneselenolate (PFB-Se) self-assembled monolayers (SAMs) on Au(111) were examined by scanning tunneling microscopy (STM). Results showed that the structural order of the SAMs was improved by vapor deposition compared to solution deposition. Kelvin probe force microscopy measurements exhibited a significant difference in the work function between pentafluorobenzenethiolate and PFB-Se SAMs due to their different domain and packing structures.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Kwan Ho Au-Yeung, Tim Kuehne, Oumaima Aiboudi, Suchetana Sarkar, Olga Guskova, Dmitry A. Ryndyk, Thomas Heine, Franziska Lissel, Francesca Moresco
Summary: This article demonstrates that the ring-closure reaction of a single vinylheptafulvene adsorbed on the Au(111) surface can be induced by voltage pulses from the tip of a scanning tunneling microscope. The cyclization is accompanied by the elimination of HCN. Further experiments show that when inducing lateral movements by applying voltage pulses, the response of the single molecules changes with the ring closing reaction.
NANOSCALE ADVANCES
(2022)
Article
Chemistry, Physical
Sebastian Schneider, Kushtrim Bytyqi, Stephan Kohaut, Patrick Buegel, Benjamin Weinschenk, Michael Marz, Amina Kimouche, Karin Fink, Regina Hoffmann-Vogel
Summary: The self-assembly behavior of DBBA molecules on Au(111) was investigated using FM-SFM and ab initio calculations. It was found that the assembly morphology of the molecules changes with increasing coverage, and different phases coexist at intermediate coverage. Additionally, the adsorption behavior and interactions of the molecules were discussed and compared with the results from ab initio calculations.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Riku Muneyasu, Takashi Yamada, Megumi Akai-Kasaya, Hiroyuki S. Kato
Summary: Investigation of heterogeneous bilayer self-assembly on Au substrates revealed that the formation of a bilayer stratified by H bonds and Au-S bonds is flexible and adaptable.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Engineering, Environmental
Jingjie Luo, Sihan Yang, Yu Ling, Wenhao Yang, Hongyu Niu, Wenlong Li, Huibin Liu, Changhai Liang
Summary: In this study, defective Au nanoparticles were successfully fabricated through the strong interplay between Au and crystal lattices of layered double hydroxides-MgxAl-LDH. The formation of a preferential-oriented LDH(0 1 5) plane at Mg/Al ratio of 3.0-3.5 enabled the surface configuration for defective Au centers, with a maximized number of step sites. The optimized Au/Mg3.5Al-LDH catalyst showed a high catalytic activity for benzyl alcohol oxidation at only 80 degrees C without the presence of alkali, with the lowest activation energy. This work provides a new insight for alkali-free selective oxidations by manipulating the interplay between Au and LDH.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Corinna Stumm, Sebastian Grau, Florian D. Speck, Felix Hilpert, Valentin Briega-Martos, Karl Mayrhofer, Serhiy Cherevko, Olaf Brummel, Joerg Libuda
Summary: This study investigates the oxidation and subsequent reduction processes of Au(111) electrodes in an acidic electrolyte, finding that the reduction rate influences the formation of holes on the surface. Slow reduction leads to larger atomic holes and dissolved Au species in the electrolyte, while fast reduction results in smaller holes and additional two-dimensional Au islands, with almost no dissolved Au detected. These differences are attributed to competing processes of dissolved Au diffusion and direct renucleation during reduction.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Yixuan Jiang, Saiyu Bu, Dechun Zhou, Xiaoguang Shi, Feng Pan, Qingmin Ji, Tianchao Niu
Summary: The study investigates the growth mechanism of mono- and bilayer iron oxide on the gold substrate, demonstrating the strong interfacial Fe-Au bonds and significant charge transfer. The second layer of FeO exhibits a modulated ellipsoidal Moire pattern due to the strong Fe-Fe bonds and varying interlayer distances at different sites, promoting future research on metal oxide-substrate interactions in catalysis.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Analytical
Li Jiang, Zizhen Yu, Weidan Zhao, Ziheng Yang, Yuyan Peng, Yan Zhou, Xiang Lin, Shangzhong Jin
Summary: Early diagnosis and treatment of pathogenic bacteria are crucial in preventing further infection. Photothermal therapy (PTT) is a promising method for sterilization, with minimal invasiveness and high efficiency. In this study, Ti3C2-Au nanomaterials were prepared with modulated absorption characteristics to achieve high photothermal conversion efficiency and sensitive label-free SERS bacterial detection. The results showed that Ti3C2-Au had better SERS performance than Au, allowing for direct and sensitive detection of E. coli and S. aureus. Ti3C2-Au NBPs exhibited enhanced photothermal conversion efficiency and broad-spectrum antibacterial properties.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Analytical
Feng Shao, Liqing Zheng, Jinggang Lan, Renato Zenobi
Summary: In this study, the local information of binary self-assembled monolayers (SAMs) on Au(111) coadsorbed from an equimolar mixture of p-cyanobenzenethiol (pCTP) and p-aminothiophenol (pATP) was investigated using tip-enhanced Raman spectroscopy (TERS) and density functional theory (DFT) calculations. The results revealed the coadsorption behavior, phase segregation, plasmon-induced photocatalysis, and solvation effects of the binary SAMs.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Andrea Gerbi, Renato Buzio, Cesar Gonzalez, Fernando Flores, Pedro L. de Andres
Summary: We propose a phase-space ab-initio formalism to calculate the current-voltage relationship of Ballistic Electron Emission Spectroscopy in a metal-semiconductor interface. The injection of electrons or holes under direct or reverse bias is studied. This research is important for determining the key technological characteristic of metal-semiconductor rectifying interfaces - the Schottky barrier.
APPLIED SURFACE SCIENCE
(2023)
Article
Biophysics
Irene Palacio, Miguel Moreno, Almudena Nanez, Agnes Purwidyantri, Telma Domingues, Patricia D. Cabral, Jerome Borme, Marzia Marciello, Jesus Ignacio Mendieta-Moreno, Beatriz Torres-Vazquez, Jose Ignacio Martinez, Maria Francisca Lopez, Mar Garcia-Hernandez, Luis Vazquez, Pavel Jelinek, Pedro Alpuim, Carlos Briones, Jose Angel Martin-Gago
Summary: Biosensors based on covalently functionalized graphene have been developed for ultra-sensitive aptamer-based detection of hepatitis C virus core protein. The induced polarization at the graphene interface causes a net shift of the Dirac cone, enhancing the sensitivity for attomolar detection. This unexpected effect opens up possibilities for ultrasensitive and real-time diagnostics of various diseases using graphene-based functionalized platforms.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Physics, Multidisciplinary
F. Ming, X. Wu, C. Chen, K. D. Wang, P. Mai, T. A. Maier, J. Strockoz, J. W. F. Venderbos, C. Gonzalez, J. Ortega, S. Johnston, H. H. Weitering
Summary: Adatoms on a Si(111) substrate form a triangular lattice with unpaired electrons. Doping the Sn layer results in a superconducting state, which may exhibit chiral d-wave symmetry. Experiments confirm a doping-dependent critical temperature, fully gapped order parameter, time-reversal symmetry breaking, and enhanced zero-bias conductance near superconducting domain edges.
Article
Chemistry, Physical
Yann Girard, Sarah Benbouabdellah, Outhmane Chahib, Cyril Chacon, Amandine Bellec, Vincent Repain, Jerome Lagoute, Yannick J. Dappe, Cesar Gonzalez, Wei-Bin Su
Summary: The coupling of graphene with cobalt allows for technological advances in spintronics. The study focuses on cobalt intercalation between graphene and a buffer layer, which results in cobalt islands covered by graphene. These islands exhibit distinct shapes and properties, including small atomic islands and flat cobalt nanodots encapsulated by graphene.
Article
Chemistry, Physical
Jose Abad, Jose I. Martinez, Paula Gomez, Miriam Mas-Montoya, Luis Rodriguez, Albano Cossaro, Alberto Verdini, Luca Floreano, Jose A. Martin-Gago, David Curiel, Javier Mendez
Summary: The control of molecular structures at the nanoscale is crucial for material and application development. The adsorption of a polyheteroaromatic molecule on Au(111) has been studied, revealing the formation of highly organized linear structures due to intermolecular hydrogen bonding. Different arrangements, including extended brick-wall and herringbone packing, were observed. Comprehensive experimental and theoretical characterizations were conducted to study the 2D hydrogen-bonded domains and the on-surface thermal stability of the physisorbed material.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Physics, Condensed Matter
Federico Frezza, Ana Sanchez-Grande, Martin Ondracek, Martin Vondracek, Qifan Chen, Oleksandr Stetsovych, Victor Villalobos-Vilda, Ezequiel Tosi, Francisco Javier Palomares, Maria Francisca Lopez, Carlos Sanchez-Sanchez, Karl-Heinz Ernst, Jose Angel Martin-Gago, Jan Honolka, Pavel Jelinek
Summary: We investigate the atomic structure and electronic properties of epitaxial SnSe structures grown on a metallic Au(111) substrate. We observe a coverage-dependent transition from metallic beta-SnSe to semiconducting alpha-SnSe phases. Comprehensive characterization techniques, combined with density functional theory, allow us to study the geometric and electronic properties of both phases.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Nanoscience & Nanotechnology
Roberto Munoz, Laia Leon-Boigues, Elena Lopez-Elvira, Carmen Munuera, Luis Vazquez, Federico Mompean, Jose Angel Martin-Gago, Irene Palacio, Mar Garcia-Hernandez
Summary: The modification of graphene surface with polymers allows for expanding its applications as a hybrid material. However, the chemical inertness of graphene poses a challenge for covalent functionalization. Researchers have developed a clean and scalable method to enhance the graphene chemical activity and synthesized a large-scale graphene-polymer hybrid material.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Microbiology
Victor Munoz-Hisado, Fatima Ruiz-Blas, Jesus Manuel Sobrado, Eva Garcia-Lopez, Emma Martinez-Alonso, Alberto Alcazar, Cristina Cid
Summary: The exploration of Mars is important for understanding its potential habitability. Recent studies have suggested the presence of liquid water in subglacial lakes below the South pole of Mars. In this study, two bacterial species were subjected to a simulated Martian environment to investigate their adaptation mechanisms. The results showed that the bacteria employed different strategies for survival.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Nerea Ruiz del arbol, Carlos Sanchez-Sanchez, Jose I. Martinez, Luis Rodriguez, David Serrate, Alberto Verdini, Luca Floreano, Peter Jacobson, Leonhard Grill, Jose A. Martin-Gago, Maria F. Lopez
Summary: Two different metal-organic frameworks were grown on Cu(111) with different structures, a honeycomb or Kagome structure, using para-aminophenol molecules and native surface adatoms. Despite the same chemical species, their structural difference highlights the critical role of reaction conditions during growth. This work emphasizes the importance of balancing thermodynamics and kinetics in the final structure of surface-supported metal-organic networks.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Sebastien E. Hadjadj, Carmen Gonzalez-Orellana, James Lawrence, Djuro Bikaljevic, Marina Pena-Diaz, Pierluigi Gargiani, Lucia Aballe, Jan Naumann, Miguel Aprimengel Nino, Michael Foerster, Sandra Ruiz-Gomez, Sangeeta Thakur, Ivar Kumberg, James M. Taylor, Jack Hayes, Jorge Torres, Chen Luo, Florin Radu, Dimas G. de Oteyza, Wolfgang Kuch, Jose Ignacio Pascual, Celia Rogero, Maxim Ilyn
Summary: The growth of magnetic 2D semiconductor FeBr2 has been widely studied, and the epitaxial growth on Au(111) substrate was investigated in this study. It was found that the single-layer FeBr2 exhibited different magnetic behavior compared to its bulk counterpart, which can be attributed to the modifications in the crystal structure due to the interaction with the substrate.
CHEMISTRY OF MATERIALS
(2023)
Article
Multidisciplinary Sciences
Rut Martinez-Moro, Maria del Pozo, Luis Vazquez, Jose A. Martin-Gago, Maria Dolores Petit-Dominguez, Elena Casero, Carmen Quintana
Summary: We have developed an electrochemical sensor for melatonin determination using MoS2 nanosheets and cucurbit[8]uril. After optimization, the sensor showed a low detection limit and high recovery.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Multidisciplinary
Meryem Bouaziz, Aymen Mahmoudi, Geoffroy Kremer, Julien Chaste, Cesar Gonzalez, Yannick J. Dappe, Francois Bertran, Patrick Le Fevre, Marco Pala, Fabrice Oehler, Jean-Christophe Girard, Abdelkarim Ouerghi
Summary: Recently, intriguing physical properties have been discovered in anisotropic semiconductors, where the non-uniformity of the in-plane electronic band structure often stems from low crystal symmetry. Atomic chains, which represent the ultimate downsizing limit for electronic materials, have emerged as a frontier in the field of one-dimensional quantum materials. Investigating the electronic and structural properties of chain-like InTe is crucial for understanding its applications in devices such as thermoelectrics. In this study, we employed scanning tunneling microscopy/scanning tunneling spectroscopy (STS) and density functional theory (DFT) calculations to directly observe the in-plane structural anisotropy in tetragonal InTe. Our results demonstrate the presence of one-dimensional In1+ chains in InTe and reveal a bandgap of approximately 0.40 +/- 0.02 eV located at the M point of the Brillouin zone. Additionally, we observed line defects in our sample, which were attributed to vacancies in the In1+ chains along the c-axis, a common feature in other TlSe-like compounds. Our STS and DFT findings confirm that the presence of In1+ induces a localized gap state near the valence band maximum, explaining the high intrinsic p-type doping of InTe that we also confirmed using angle-resolved photoemission spectroscopy.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Chemistry, Physical
Fatma Ibraheem, Hany El-Bahnasawy, Iman A. Mahdy, Manal A. Mahdy, Esmat A. Mahmoud, J. Enrique Ortega, Martina Corso, Celia Rogero, Afaf El-Sayed
Summary: In this study, a new class of diluted magnetic quantum dots (DMQDs) was designed by hybridizing inorganic CdS quantum dots with organic iron phthalocyanine (FePc) molecules. Experimental results showed that FePc molecules transformed the CdS quantum dots into room-temperature soft ferromagnets, while effectively preserving the structure of the quantum dots.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
M. N. Nair, I. Palacio, A. Mascaraque, E. G. Michel, A. Taleb-Ibrahimi, A. Tejeda, C. Gonzalez, A. Martin-Rodero, J. Ortega, F. Flores
Summary: This study reports an experimental and theoretical investigation of the electron-phonon coupling in α-Sn/Ge(111). The results show the presence of a significant electron-phonon interaction in a specific phase of α-Sn/Ge(111), which may play a role in the formation of different phases at low temperatures.