Article
Chemistry, Physical
Fabio Ronci, Stefano Colonna, Roberto Flammini, Maurizio De Crescenzi, Manuela Scarselli, Matteo Salvato, Isabelle Berbezier, Holger Vach, Paola Castrucci
Summary: In this paper, an in-depth study was conducted on the growth of nickel silicides under different conditions. It was found that two different nickel silicides form progressively as the annealing temperature increases. The presence of a graphene layer does not alter the nature of the silicide phases but affects the morphology of the silicide overlayer.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Alice Apponi, Domenica Convertino, Neeraj Mishra, Camilla Coletti, Mauro Iodice, Franco Frasconi, Federico Pilo, Narcis Silviu Blaj, Daniele Paoloni, Ilaria Rago, Giovanni De Bellis, Gianluca Cavoto, Alessandro Ruocco
Summary: In this study, accurate transmission measurements of electrons below 1 keV through suspended monolayer graphene were reported. The monolayer graphene was grown using chemical vapor deposition and transferred onto transmission electron microscopy (TEM) grids. The transparency of graphene was obtained by measuring the direct beam current and transmitted current. The experimental results showed a transmission rate ranging from about 20% to about 80% for monolayer graphene within the experimental electron energy range. The high quality and grid coverage of the suspended graphene were confirmed through various characterization techniques. Additionally, evidence of suspended monolayer graphene was observed after annealing the samples in vacuum at 550 degrees C.
Article
Chemistry, Multidisciplinary
Kenan Elibol, Peter A. Van Aken
Summary: Controlled fabrication of devices for plasmonics on suspended graphene enables tunable localized surface plasmon resonances and the creation of hybrid 3D-2D systems, which have potential applications in adjustable dipole-dipole coupling and plasmon-mediated catalysis.
Article
Materials Science, Multidisciplinary
Yueguo Hu, Junping Peng, Mengchun Pan, Weicheng Qiu, Ruinan Wu, Jiafei Hu, Nan Hu, Feiyu Cheng, Rong Huang, Fangsen Li, Dixiang Chen, Qi Zhang, Peisen Li
Summary: This paper successfully prepared an epitaxial wafer-scale single-crystalline Ni(111) film on a commercial alpha-Al2O3(0001) substrate, and synthesized an ultra-flat and wrinkle-free graphene monolayer on it, demonstrating the key role of clean and uniform sapphire surface in the single crystallization of Ni films.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Kenan Elibol, Peter A. van Aken
Summary: We report the adjustment of charge-transfer-plasmon (CTP) resonances in aluminum bowties on graphene through controlled nanofabrication and focused electron-beam irradiation. The CTP resonances show different frequency shifts and decay behaviors with changes in the junction width and electron-beam irradiation, revealing the tunability and sensitivity of the resonances.
Article
Multidisciplinary Sciences
Kyung Yeol Ma, Leining Zhang, Sunghwan Jin, Yan Wang, Seong In Yoon, Hyuntae Hwang, Juseung Oh, Da Sol Jeong, Meihui Wang, Shahana Chatterjee, Gwangwoo Kim, A-Rang Jang, Jieun Yang, Sunmin Ryu, Hu Young Jeong, Rodney S. Ruoff, Manish Chhowalla, Feng Ding, Hyeon Suk Shin
Summary: Large-area single-crystal trilayer hBN has been successfully grown using a chemical vapour deposition (CVD) method. The hBN film acts as a protective layer and shows potential in the fabrication of 2D semiconductors.
Article
Multidisciplinary Sciences
Feng Shao, Wei Wang, Weimin Yang, Zhilin Yang, Yao Zhang, Jinggang Lan, A. Dieter Schlueter, Renato Zenobi
Summary: This study investigates plasmon-induced [4+4]-cycloaddition polymerization within anthracene-based monomer monolayers on Au(111) using TERS imaging. The experimental results combined with DFT calculations show that this two-dimensional polymerization occurs via a hot electron tunneling mechanism on Au(111).
NATURE COMMUNICATIONS
(2021)
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, 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
B. P. Reed, M. E. Bathen, J. W. R. Ash, C. J. Meara, A. A. Zakharov, J. P. Goss, J. W. Wells, D. A. Evans, S. P. Cooil
Summary: The research investigates the evolution of the diamond (111) surface as it undergoes reconstruction and subsequent graphene formation using various techniques and analysis. It shows that the C(111)-(2 x 1) reconstructed surface is metallic with intersecting electronic states at the Fermi level, contributing to resolving controversies in the literature. Graphene can be formed at higher temperatures above this reconstructed surface, with little substrate interaction, and the underlying diamond surface can be hydrogen-terminated through plasma processing without removing the graphene layer, forming a graphene-semiconductor interface.
Article
Chemistry, Multidisciplinary
Luzhao Sun, Buhang Chen, Wendong Wang, Yanglizhi Li, Xiongzhi Zeng, Haiyang Liu, Yu Liang, Zhenyong Zhao, Ali Cai, Rui Zhang, Yeshu Zhu, Yuechen Wang, Yuqing Song, Qingjie Ding, Xuan Gao, Hailin Peng, Zhenyu Li, Li Lin, Zhongfan Liu
Summary: This study found that trace amounts of oxygen enhance the interaction between graphene and Cu(111) substrate, eliminating misoriented graphene domains. Through a modified anomalous grain growth method and a self-designed pilot-scale CVD system, high-quality single-crystal graphene films were produced on Cu(111) foils in batch production. The findings and strategies provided in this work could accelerate the mass production of high-quality misorientation-free graphene films.
Article
Chemistry, Physical
Y. Yang, K. H. Gao, W. J. Wang, G. Yu, Y. Sun, X. H. Zhang, Z. Q. Li
Summary: An anomalous carrier-concentration dependence of electron-electron interactions was observed in epitaxial graphene on SiC, offering a new route to control EEI in graphene.
Article
Chemistry, Physical
Stefano Veronesi, Georg Pfusterschmied, Filippo Fabbri, Markus Leitgeb, Omer Arif, Daniel Arenas Esteban, Sara Bals, Ulrich Schmid, Stefan Heun
Summary: Nanoporous materials, such as graphene, with a three-dimensional porous structure, have shown great potential for various applications. In this study, we report the successful three-dimensional growth of graphene on a porousified crystalline 4H-SiC(0001) substrate. The high quality and uniformity of the graphene were confirmed by Transmission Electron Microscopy and Raman spectroscopy.
Article
Chemistry, Physical
John R. Rumptz, Kun Zhao, Jackson Mayo, Charles T. Campbell
Summary: The use of carbon supports for late transition-metal nanoparticle catalysts has increased in recent years. However, there is limited understanding of the bonding energetics between metal nanoparticles and carbon supports. In this study, the growth morphology and heats of adsorption of Ni on graphene/Ni(111) were investigated, providing insights into Ni chemical potential and Ni/graphene adhesion energy.
Article
Chemistry, Physical
Rocco Davi, Giovanni Carraro, Marija Stojkovska, Marco Smerieri, Letizia Savio, Jean-Jacques Gallet, Fabrice Bournel, Mario Rocca, Luca Vattuone
Summary: We investigated the influence of vacancies on graphene exposed to CO using synchrotron radiation-induced core level photoemission spectroscopy. CO reacted with graphene to produce additional carbon atoms and CO2. CO intercalates and CO2 molecules bind to vacancies, forming covalently bonded species containing C and O, repairing the defects.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Jaakko Mastomaki, Stefano Roddaro, Mirko Rocci, Valentina Zannier, Daniele Ercolani, Lucia Sorba, Ilari J. Maasilta, Nadia Ligato, Antonio Fornieri, Elia Strambini, Francesco Giazotto
Article
Physics, Applied
Federico Paolucci, Giorgio De Simoni, Paolo Solinas, Elia Strambini, Nadia Ligato, Pauli Virtanen, Alessandro Braggio, Francesco Giazotto
PHYSICAL REVIEW APPLIED
(2019)
Article
Physics, Applied
D. Alesini, D. Babusci, C. Barone, B. Buonomo, M. M. Beretta, L. Bianchini, G. Castellano, F. Chiarello, D. Di Gioacchino, P. Falferi, G. Felici, G. Filatrella, L. G. Foggetta, A. Gallo, C. Gatti, F. Giazotto, G. Lamanna, F. Ligabue, N. Ligato, C. Ligi, G. Maccarrone, B. Margesin, F. Mattioli, E. Monticone, L. Oberto, S. Pagano, F. Paolucci, M. Rajteri, A. Rettaroli, L. Rolandi, P. Spagnolo, A. Toncelli, G. Torrioli
JOURNAL OF LOW TEMPERATURE PHYSICS
(2020)
Article
Physics, Applied
C. Puglia, G. De Simoni, N. Ligato, F. Giazotto
APPLIED PHYSICS LETTERS
(2020)
Article
Nanoscience & Nanotechnology
Elia Strambini, Andrea Iorio, Ofelia Durante, Roberta Citro, Cristina Sanz-Fernandez, Claudio Guarcello, Ilya V. Tokatly, Alessandro Braggio, Mirko Rocci, Nadia Ligato, Valentina Zannier, Lucia Sorba, F. Sebastian Bergeret, Francesco Giazotto
NATURE NANOTECHNOLOGY
(2020)
Article
Physics, Applied
Federico Paolucci, Nadia Ligato, Vittorio Buccheri, Gaia Germanese, Pauli Virtanen, Francesco Giazotto
PHYSICAL REVIEW APPLIED
(2020)
Article
Physics, Applied
Federico Paolucci, Vittorio Buccheri, Gaia Germanese, Nadia Ligato, Riccardo Paoletti, Giovanni Signorelli, Massimiliano Bitossi, Paolo Spagnolo, Paolo Falferi, Mauro Rajteri, Claudio Gatti, Francesco Giazotto
JOURNAL OF APPLIED PHYSICS
(2020)
Review
Chemistry, Multidisciplinary
Federico Paolucci, Nadia Ligato, Gaia Germanese, Vittorio Buccheri, Francesco Giazotto
Summary: This article reviews the design and experimental realization of two bias-current-tunable sensors based on one dimensional fully superconducting Josephson junctions: the nanoscale transition edge sensor (nano-TES) and the Josephson escape sensor (JES. The nano-TES promises a state-of-the-art noise equivalent power (NEP) of about 5x10(-20) W/root Hz, while the JES active region is expected to show an unprecedented NEP of the order of 10(-25) W/root Hz, making them strong candidates to push radio astronomy to the next level.
APPLIED SCIENCES-BASEL
(2021)
Article
Multidisciplinary Sciences
Nadia Ligato, Elia Strambini, Federico Paolucci, Francesco Giazotto
Summary: The proposed superconducting memory cell utilizes the hysteretic phase-slip transition in long aluminum nanowire Josephson junctions to encode logic states, disentangling it from the large-inductance constraint and providing topological protection against stochastic phase-slips and magnetic-flux noise. This makes it a promising solution for advanced superconducting classical logic architectures or flux qubits.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Nadia Ligato, Federico Paolucci, Elia Strambini, Francesco Giazotto
Summary: Researchers have demonstrated the phase control of heat currents by utilizing the superconducting proximity effect. They have designed a T-SQUIPT device, which consists of an aluminum nanowire embedded in a superconducting ring. By changing the magnetic flux through the ring, the phase bias can be controlled, leading to temperature modulations. The device also exhibits hysteresis in the local density of states due to phase-slip transitions, allowing it to operate as a phase-tunable thermal memory.
Article
Multidisciplinary Sciences
E. Strambini, M. Spies, N. Ligato, S. Ilic, M. Rouco, Carmen Gonzalez-Orellana, Maxim Ilyn, Celia Rogero, F. S. Bergeret, J. S. Moodera, P. Virtanen, T. T. Heikkila, F. Giazotto
Summary: Diodes are important elements in electronics and optics, and their evolution towards low dissipation electronics has led to the development of supercurrent diodes with zero resistance in one direction. In this study, researchers demonstrate a superconducting tunnel diode with zero conductance in one direction by utilizing a thin ferromagnetic insulator. This cryogenic spintronic rectifier shows promise in highly-sensitive radiation detection and future low-dissipation and fast superconducting electronics.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
Giorgio De Simoni, Nadia Ligato, Francesco Giazotto, Lorenzo Cassola, Giuseppe C. Tettamanzi
Summary: This paper reports an aluminum double-loop bi-SQUID based on proximitized mesoscopic copper Josephson junctions, which is important for quantum sensing and signal processing in the radio-frequency range. The new fabrication approach allows for adjustable junction characteristics and device responses through the geometry of the metallic weak links, which is different from conventional tunnel-junction-based interferometers.
PHYSICAL REVIEW APPLIED
(2022)
Article
Engineering, Electrical & Electronic
Giorgio De Simoni, Sebastiano Battisti, Nadia Ligato, Maria Teresa Mercaldo, Mario Cuoco, Francesco Giazotto
Summary: In this study, an Al superconducting quantum interference device with gate-controlled proximity Cu mesoscopic weak links for the Josephson junctions was demonstrated. These metallic weak links behave similarly to genuine superconducting metals in response to electrostatic gating and show good performance in terms of current-modulation visibility. Static gate voltage can modify the interferometer current-flux relation, suggesting compatibility with the introduction of p-channels within the gated weak link.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Physics, Multidisciplinary
Alberto Hijano, Stefan Ilic, Mikel Rouco, Carmen Gonzalez-Orellana, Maxim Ilyn, Celia Rogero, P. Virtanen, T. T. Heikkila, S. Khorshidian, M. Spies, N. Ligato, F. Giazotto, E. Strambini, F. Sebastian Bergeret
Summary: The research focuses on the spin splitting phenomenon in ferromagnetic insulator/superconductor bilayers and its significance for superconducting spintronics and Majorana fermion realization. The study determines the impact of the thickness of the superconductor layer on the magnitude of spin splitting, as well as the range of parameters suitable for coexisting exchange field and superconductivity. By comparing theory with experimental results, the accuracy and importance of the theory are confirmed.
PHYSICAL REVIEW RESEARCH
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
D. Alesini, D. Babusci, C. Barone, B. Buonomo, M. M. Beretta, L. Bianchini, G. Castellano, F. Chiarello, D. Di Gioacchino, P. Falferi, G. Felici, G. Filatrella, L. G. Foggetta, A. Gallo, C. Gatti, F. Giazotto, G. Lamanna, F. Ligabue, N. Ligato, C. Ligi, G. Maccarrone, B. Margesin, F. Mattioli, E. Monticone, L. Oberto, S. Pagano, F. Paolucci, M. Rajteri, A. Rettaroli, L. Rolandi, P. Spagnolo, A. Toncelli, G. Torrioli
14TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS2019)
(2020)
Article
Chemistry, Physical
Erhao Gao, Wenjing Feng, Qi Jin, Li Han, Yi He
Summary: The influence of K-doping on the reactive oxygen species and elementary reactions of HCHO catalytic oxidation was investigated using density functional theory (DFT). The introduction of K-doping changed the electronic structures of Ce and O, facilitating the adsorption and activation of HCHO and O2 molecules, enhancing lattice oxygen mobility, and reducing the energy barrier for HCHO oxidation. K-doping also promoted the formation of hydroxyl groups, facilitating HCHO adsorption and oxidation.
Article
Chemistry, Physical
Hao Fu, Zhangliang Xu
Summary: In this study, the adsorption mechanisms and detection performance of formaldehyde, ammonia, and sulfur dioxide on undoped and metal-doped ZnO surfaces were investigated using density functional theory. The results showed that formaldehyde and ammonia were physically adsorbed on the undoped ZnO surface, while sulfur dioxide was weakly chemisorbed. The adsorption energy was enhanced when ZnO was doped with metals. These findings provide theoretical guidance for the application of ZnO substrate materials in gas sensitivity research.
Article
Chemistry, Physical
Atsushi Nomura, Tohru Kurosawa, Migaku Oda, Satoshi Demura, Shogo Kuwahara, Sora Kobayashi, Hideaki Sakata
Summary: The study investigates the tunneling spectra of 1T-TiSe2 in the CDW state and the dip structure below the Fermi level, aiming to determine whether this dip is a CDW gap. The answer to this question is crucial for understanding the driving mechanism of CDW.
Article
Chemistry, Physical
A. S. Petrov, D. I. Rogilo, A. I. Vergules, V. G. Mansurov, D. V. Sheglov, A. V. Latyshev
Summary: This study investigates Si mass transport and morphological transformations on the Si(111) surface during (root 3 x root 3)-Sn reconstruction formation and Si homoepitaxy. The research shows that the formation of different Sn phases at different temperatures affects the Si island nucleation and monatomic step shift, which in turn impact the morphology of the Sn/Si(111) interface. Electromigration-induced drift of disordered Sn domains leads to enhanced noncompensated Si mass transport and surface roughening.
Article
Chemistry, Physical
D. V. Gruznev, L. V. Bondarenko, A. Y. Tupchaya, A. A. Yakovlev, A. N. Mihalyuk, A. V. Zotov, A. A. Saranin
Summary: Deposition of thallium (Tl) onto the Au/Si(111)5 x 2 reconstruction followed by annealing results in the formation of a surface structure with 4 x 2 periodicity. The immiscibility of Au and Tl leads to the migration of Tl atoms over the Si chains. Thallium donates electrons to the surface, converting the metallic surface into an insulating state and altering the inter-chain distance within the array of Au atomic wires.
Article
Chemistry, Physical
Simone Giusepponi, Francesco Buonocore, Barbara Ferrucci, Massimo Celino
Summary: Using ab-initio calculations, the interaction between lead adatom and both clean and doped iron (100) surfaces was investigated. It was found that the lead adatom prefers to adsorb in the hollow site, which is more stable compared to the top and bridge sites, and in this position, it is energetically favorable over the iron adatom. Moreover, lead adsorbed in the hollow site of the iron (100) surface doped with chromium was found to create a more stable system compared to nickel-doped surfaces with an iron adatom in the same position. The study also explored inter-layer distances, bonding mechanisms, magnetic behaviors, and charge density differences. The results provide insights into the role of doping in the interaction between lead adatom and iron surface, and have implications for the analysis of corrosion processes caused by liquid lead.
Article
Chemistry, Physical
Shuo Zhang, Jin-Ho Choi
Summary: The recent synthesis of two-dimensional layered WSi2N4 has attracted attention due to its potential applications. This study investigates the catalytic performance of WSi2N4 monolayers with nitrogen vacancies in the hydrogen evolution reaction using first-principles calculations. The results show that the defective WSi2N4 monolayers exhibit remarkably high catalytic activity comparable to platinum catalysts. Electronic structure calculations also reveal the emergence of spin-polarized states due to the introduction of nitrogen vacancies.
Article
Chemistry, Physical
Xiaoyan Yu, Xin Cao, Wei Kang, Shanhua Chen, Ao Jiang, Yuhao Luo, Wenwei Deng
Summary: First-principles calculations were used to investigate the electronic properties of a TiO2 heterostructure modified with Bi2Te3 co-catalyst. The study revealed that the Bi2Te3/TiO2 interface introduced optimal band offsets, effectively suppressing electron-hole recombination and enhancing the utilization efficiency of photo-generated carriers. Additionally, the Bi2Te3 co-catalyst introduced extra catalytic active sites, further boosting the photo-catalytic hydrogen evolution efficiency.
Article
Chemistry, Physical
Filippo Longo, Emanuel Billeter, Selim Kazaz, Alessia Cesarini, Marin Nikolic, Aarati Chacko, Patrik Schmutz, Zbynek Novotny, Andreas Borgschulte
Summary: Alkaline water electrolysis is a simple and efficient method for renewable hydrogen production, utilizing cheap and abundant transition metals. The catalytic properties of Ni materials are enhanced by the formation of oxidized compounds on the surface. The high electrocatalytic activity of Ni (oxy)-hydroxides is directly related to water intercalation in the passivation layer, supporting the hypothesis of a water mediated OH- diffusion mechanism. The self-organization of the surface structure during passivation layer formation enables high electrode performance.
Article
Chemistry, Physical
Mohan Kumar Kuntumalla, Miriam Fischer, Alon Hoffman
Summary: By investigating the bonding, retention, and thermal stability of nitrogen in H-Diamond (100), it was found that nitrogen can partially recover its bonding with carbon atoms after high-temperature annealing, indicating a high thermal stability of nitrogen in diamond.
Article
Chemistry, Physical
Dong Yue, Liangying Wen, Rong Chen, Jianxin Wang, Zhongqing Yang
Summary: The adsorption behavior of Cl2 molecules on the TiC surface and the formation and transfer of reaction products were studied using first-principles ab initio calculations. The results show that the Cl atoms bonded to the surface Ti atoms are more stable, and the TiCl3 intermediate is easier to form than the TiCl2 intermediate.
Article
Chemistry, Physical
Yatao Wang, Peng Zhang, Hongjuan Li, Qiuju Xu, Shujun Liu, Xiaopeng Liu, Xuehua Guo, Yitao Li, Jinzhang Liu, Sen Dong, Zhi Wei Seh, Qianfan Zhang
Summary: In this study, the adsorption performance of two types of metal-organic frameworks (MOFs) for thiophene and benzene was experimentally investigated. The results showed that IZE-1 exhibited high selectivity and superior adsorption capacity for thiophene, especially at low concentrations. First-principles calculations and molecular dynamics simulations provided insights into the mechanism of thiophene adsorption and the high selectivity observed. This research demonstrates the potential of MOFs for thiophene adsorption, particularly at high concentrations.
