Article
Materials Science, Multidisciplinary
Junji Yuhara, Hiroaki Muto, Masaaki Araidai, Masato Kobayashi, Akio Ohta, Seiichi Miyazaki, Sho-ichi Takakura, Masashi Nakatake, Guy Le Lay
Summary: In this study, single phase monolayer germanene has been successfully obtained on aluminum thin films using atomic segregation epitaxy, exhibiting unique structural characteristics that can be potentially explored for future research on its properties.
Article
Chemistry, Physical
Junji Yuhara, Hiroki Shimazu, Masato Kobayashi, Akio Ohta, Seiichi Miyazaki, Sho-ichi Takakura, Masashi Nakatake, Guy Le Lay
Summary: The epitaxial growth of low-dimensional nanostructures formed by surface segregation of germanium on single crystalline Ag(110) thin films supported by a Ge(110) template was investigated. Various quantum structures were observed, including commensurate and incommensurate structures, narrow stripes, and one-dimensional Ge nanostructures. These structures are proposed to be zig-zag germanene nanoribbons with potentially exciting electronic, spintronic, and topological properties.
APPLIED SURFACE SCIENCE
(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
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, Multidisciplinary
Qiwei Tian, Sahar Izadi Vishkayi, Meysam Bagheri Tagani, Li Zhang, Yuan Tian, Long-Jing Yin, Lijie Zhang, Zhihui Qin
Summary: Researchers have successfully constructed two types of artificial germanium superlattices and confined the position of germanium atoms using a bismuth-induced electronic kagome lattice. The results show that at low temperature, germanium atoms form a single-atom superlattice, while at room temperature, germanium atoms and clusters are confined in different positions of the kagome lattice potential valleys, forming an artificial honeycomb superlattice.
Article
Chemistry, Multidisciplinary
Kai Zhang, Marie-Christine Hanf, Romain Bernard, Yves Borensztein, Hervei Cruguel, Andrea Resta, Yves Garreau, Alina Vlad, Alessandro Coati, Davide Sciacca, Bruno Grandidier, Mickael Derivaz, Carmelo Pirri, Philippe Sonnet, Reigis Stephan, Geoffroy Prevot
Summary: Through scanning tunneling microscopy (STM), surface X-ray diffraction (SXRD), and density functional theory, we have revealed a Ge-induced (root 109 x root 109)R +/- 24.5 degrees reconstruction on Ag(111). We have demonstrated the possibility of solving a giant surface reconstruction using SXRD and STM. The reconstructed structure consists of Ge pentagons, hexagons, and heptagons, with the inclusion of a few dispersed Ag atoms.
Article
Chemistry, Physical
Tsutomu Kikuchi, Takashi Yokoyama
Summary: Triangular islands composed of six Ag adatoms are observed on the Ge(111)-Ag surface after the formation of the 3×3 structure, disappearing at room temperature. Furthermore, structural evolution from the triangular islands to 3×3 and 6×6 superstructures is observed after additional deposition of Ag at room temperature.
Article
Physics, Multidisciplinary
Hu Jin-Ping, He Bing-Chen, Wang Hong-Bing, Zhang Huan, Huang Chao-Qin, Xie Lei, Guo Xiao, Liang Zhao-Feng, Chen Shi, Huang Han, Song Fei
Summary: The growth behaviors of semimetallic bismuth (Bi) on Ag(111) and Au(111) substrates were studied using scanning tunneling microscopy (STM) and density flooding theory (DFT). The results showed different growth patterns of Bi atoms on Ag(111) and Au(111) substrates, indicating the significance of the interaction between Bi atoms and the substrate.
ACTA PHYSICA SINICA
(2022)
Article
Physics, Multidisciplinary
M. Omidian, J. Brand, N. Neel, S. Crampin, J. Kroeger
Summary: Epitaxially grown Fe nanostructures on Pb(111) were studied using low-temperature scanning tunneling microscopy and spectroscopy. The Fe assemblies were categorized into two groups based on their electronic behavior near the Fermi energy. One group exhibited a metallic behavior with a wide energy gap of 0.7 eV that remained temperature-independent. These Fe islands lacked the superconductivity proximity effect in their interior. The other group displayed a metallic behavior at the Fermi level, with the substrate superconducting phase locally entering these islands, evidenced by sharp resonance at the Fermi energy indicating possible Andreev reflection at the magnet-superconductor interface.
NEW JOURNAL OF PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Andreas Jeindl, Jari Domke, Lukas Hoermann, Falko Sojka, Roman Forker, Torsten Fritz, Oliver T. Hofmann
Summary: The fabrication of nanomaterials involves self-organization processes of functional molecules on inorganic surfaces. By equipping molecules with functional groups, specific molecular arrangements can be obtained. However, the complexities of processes at interfaces can lead to unexpected structures, as shown in the example of a series of quinones on Ag(111). The study reveals a nonintuitive interplay of important interaction mechanisms, challenging the design of functional interfaces despite the ability to devise design principles for self-assembly of functionalized molecules.
Article
Chemistry, Physical
Rubem Caetano, Astrid Ali, Jade Barreto, Guilherme Felix, Maria I. Ramos, Braulio S. Archanjo, Carlos A. Achete, Emilia Annese, Fernando Stavale
Summary: This study examines the structure of Mn3O4 (110) thin films and finds that the surface contains both Mn3+ and Mn2+ ions, which contribute to its catalytic activity. The film surface has a fully oxidized layer of Mn2+ and Mn3+ ions at the interface with Cu metal.
Article
Chemistry, Physical
Sandra Stanionyte, Tadas Malinauskas, Gediminas Niaura, Martynas Skapas, Jan Devenson, Anunas Krotkus
Summary: Bismuth films with different thicknesses were grown on a Si (111) substrate by molecular beam epitaxy, where the crystal structures and strain properties were studied using high-resolution X-ray diffraction and Raman measurements. It was found that different phases of bismuth exhibit distinct structural features and physical properties depending on the layer thickness.
Article
Physics, Condensed Matter
Shivani Varshney, Longxing Chi, Chandra Veer Singh, Jun Nogami
Summary: Ultra-thin PbBr2 overlayers on Ag (111) surface were grown using thermal evaporation. The surface structure of these films was studied by scanning tunneling microscopy, verified by low energy electron diffraction, and simulated using density functional theory. This study is important for understanding the growth of CsPbBr3 perovskite thin films under similar conditions.
SOLID STATE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Donglin Li, Luye Sun, Yuanqi Ding, Mengxi Liu, Lei Xie, Yinfu Liu, Lina Shang, Yangfan Wu, Hui-Jun Jiang, Lifeng Chi, Xiaohui Qiu, Wei Xu
Summary: This study focuses on the role of water molecules in driving chiral separation on the surface when RNA base uracil selfassembles into homochiral structures upon water exposure. The findings provide insights into the general role of water molecules in the origin of homochirality in living systems, with implications for other biologically relevant molecules such as amino acids and sugars.
Article
Multidisciplinary Sciences
Alexander Kerelsky, Carmen Rubio-Verdu, Lede Xian, Dante M. Kennes, Dorri Halbertal, Nathan Finney, Larry Song, Simon Turkel, Lei Wang, Kenji Watanabe, Takashi Taniguchi, James Hone, Cory Dean, Dmitri N. Basov, Angel Rubio, Abhay N. Pasupathy
Summary: This study demonstrates the formation of emergent correlated phases in multilayer rhombohedral graphene without the need for twisted van der Waals layers. The study shows that two layers of bilayer graphene twisted by a tiny angle can host large regions of uniform rhombohedral four-layer graphene with a sharp van Hove singularity. Furthermore, the study suggests that the broken symmetry state in ABCA graphene could be attributed to a charge-transfer excitonic insulator or a ferrimagnet.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Review
Chemistry, Physical
Akitoshi Shiotari, Hiroyuki Koshida, Hiroshi Okuyama
Summary: The study focuses on the interaction between nitric oxide (NO) and metal surfaces, mainly on the valence electronic states, and recent research has used STM and AFM to study individual molecules.
SURFACE SCIENCE REPORTS
(2021)
Article
Multidisciplinary Sciences
Shinichiro Hatta, Ko Obayashi, Hiroshi Okuyama, Tetsuya Aruga
Summary: The study revealed that the vdW interface in Bi2Te3 films can lead to a significant increase in conductivity with increasing thickness due to the confinement of conduction band states at the interface.
SCIENTIFIC REPORTS
(2021)
Review
Chemistry, Physical
Yoshiyuki Ohtsubo, Shin-ichi Kimura, Fumitoshi Iga
Summary: This article reviews the peculiar metallic electronic states proposed and observed in Kondo insulators, and the importance of topological Kondo insulators. The controversial conclusions from experimental studies of these states are mainly due to the difficulty and inhomogeneity of the single crystal surfaces of the TKI candidates. Recent progress in forming homogeneous and well-defined clean surfaces has provided a better understanding of the surface electronic states in SmB6 and YbB12.
ELECTRONIC STRUCTURE
(2022)
Article
Chemistry, Physical
H. Okuyama, S. Kuwayama, Y. Nakazawa, S. Hatta, T. Aruga
Summary: The structure and electronic states of copper phthalocyanine (CuPc) on Cu(100) and Cu(110) surfaces were investigated using scanning tunneling microscopy/spectroscopy (STM/STS). It was found that CuPc adsorbs flat on Cu(100) with the lowest unoccupied molecular orbital (LUMO) shifted below the Fermi level. On Cu(110), CuPc adsorbs in a low-symmetry configuration and preferentially forms dimers, causing the split LUMO to shift below the Fermi level. The hybridization with surface d band was proposed to play a crucial role in the energy level alignment and structure dependence of CuPc on Cu surfaces.
Article
Multidisciplinary Sciences
Yoshiyuki Ohtsubo, Toru Nakaya, Takuto Nakamura, Patrick Le Fevre, Francois Bertran, Fumitoshi Iga, Shin-Ichi Kimura
Summary: The breakdown of in-plane rotation symmetry in topological surface states (TSSs) of SmB6 is shown to be related to the importance of surface atomic structure. Experimentally, it is found that TSSs are anisotropic and lack the fourfold rotation symmetry observed in the bulk on the SmB6(001)-p(2 x 2) surface. These results suggest that engineering the surface atomic structure could provide a new pathway to tailor various properties of TSSs.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
H. Okuyama, D. Yamamoto, S. Hatta, T. Aruga
Summary: The interaction between Ag atoms and graphene moire on Rh(111) was investigated using scanning tunneling microscopy. At 15 K, Ag atoms mainly existed as monomers at specific sites in the moire unit cell due to suppressed thermal diffusion. The presence of Ag(5s)-C(2pz) anti-bonding state was identified by the dI/dV peak at around 0.5 V above the Fermi level. At higher temperatures, Ag adatoms were thermally activated to diffuse and form clusters, with the barrier for activation depending on the moire periodicity. Additionally, injection of tunneling electrons into the anti-bonding state induced migration. This study provides atomic-scale insight into the aggregation process of metal adatoms on metal-supported graphene.
Article
Chemistry, Physical
Shigemi Terakawa, Shinichiro Hatta, Hiroshi Okuyama, Tetsuya Aruga
Summary: Magnetic van der Waals (vdW) materials have gained significant attention for their potential applications in spintronics. 3d transition metal dihalides are a promising class of materials with intriguing magnetic and electronic properties. In this study, we successfully grew (0001)-oriented FeBr2 films from the monolayer using molecular beam epitaxy on the Bi(111) surface. The atomic structure of the films was confirmed to be identical to the bulk FeBr2 crystal. Angle-resolved photoelectron spectroscopy revealed that the FeBr2 films are insulating down to the monolayer.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Takuto Nakamura, Toru Nakaya, Yoshiyuki Ohtsubo, Hiroki Sugihara, Kiyohisa Tanaka, Ryu Yukawa, Miho Kitamura, Hiroshi Kumigashira, Keiichiro Imura, Hiroyuki S. Suzuki, Noriaki K. Sato, Shin-ichi Kimura
Summary: The electronic structure changes on the SmS surface under K doping are investigated using core-level photoelectron spectroscopy and angle-resolved photoelectron spectroscopy. The results show that the mean valence of Sm on the surface increases from nearly divalent to trivalent states with increasing K deposition. This carrier-induced valence transition (CIVT) from Sm2+ to Sm3+ is opposite to the conventional electron doping. The excess electrons from K atoms transfer to S sites, and the liberated electrons from Sm3+ ions due to CIVT are trapped around the Sm3+ ions like local excitons.
Article
Materials Science, Multidisciplinary
Takuto Nakamura, Yoshiyuki Ohtsubo, Ayumi Harasawa, Koichiro Yaji, Shik Shin, Fumio Komori, Shin-ichi Kimura
Summary: In this study, the spin-orbit texture in a surface Rashba system on Bi/InAs(110)-(2 x 1) was investigated, revealing odd fluctuations in the spin polarization and unexpected freedom for spin manipulation.
Article
Materials Science, Multidisciplinary
Shigemi Terakawa, Shinichiro Hatta, Hiroshi Okuyama, Tetsuya Aruga
Summary: We report on the formation of triple-atomic-layer metal films on Si(111) by depositing Mg onto In double-layer films. The (In, Mg) triple-layer phase exhibits a unique electronic structure, characterized by a circular Fermi surface composed of two circles with different radii.
Article
Chemistry, Physical
Kenta Kuroishi, Muhammad Rifqi Al Fauzan, Thanh Ngoc Pham, Yuelin Wang, Yuji Hamamoto, Kouji Inagaki, Akitoshi Shiotari, Hiroshi Okuyama, Shinichiro Hatta, Tetsuya Aruga, Ikutaro Hamada, Yoshitada Morikawa
Summary: In this study, the reaction of nitric oxide (NO) on Cu(100) was investigated using various techniques, revealing a high reactivity of NO on the surface with N2O and O as the main products. The formation of (NO)(2) and a flat-lying ONNO are considered to be the key factors leading to the exceptionally high reactivity of NO on Cu(100).
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Qi-Wen Chen, Ze-Qing Guo, Jian-Ping Zhou
Summary: Multifunctional continuous solid solutions NFMTO-x were successfully synthesized via a one-step hydrothermal method by controlling the ratio of Mg and Fe. The NFMTO-x materials exhibited enhanced visible light response, effective adsorption and photocatalytic degradation of organic pollutants, CO2 methanation capability, and easy recyclability due to their magnetic properties. This research provides a significant multifunctional material for water purification.
APPLIED SURFACE SCIENCE
(2024)
Review
Chemistry, Physical
George E. Stan, Maziar Montazerian, Adam Shearer, Bryan W. Stuart, Francesco Baino, John C. Mauro, Jose M. F. Ferreira
Summary: Bioactive glasses have the ability to form strong bonds with tissues and release therapeutic ions. However, their biomechanical compatibility limits their use in load-bearing applications. The use of magnetron sputtering technology to fabricate BG coatings shows promise in improving their efficacy and potential for application.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Zhaoxuan Wang, Zhicheng Yan, Zhigang Qi, Yu Feng, Qi Chen, Ziqi Song, Meng Huang, Peng Jia, Ki Buem Kim, Weimin Wang
Summary: The corrosion behavior of Fe-60 and Fe-83 ribbons in 0.6 M NaCl was studied. Fe-60 exhibited a local corrosion mode and formed a stable passivation film with higher corrosion resistance, while Fe-83 showed a combination of local and global corrosion modes and had lower corrosion resistance. Controlling the precipitation of nanocrystalline phases and increasing the POx content in the passivation film significantly improved the corrosion resistance of Fe-based glassy alloys.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Hao-Kai Peng, Sheng-Yen Zheng, Wei-Ning Kao, Ting-Chieh Lai, Kai-Sheun Lee, Yung- Hsien Wu
Summary: This study investigates the effects of high energy/fluence proton radiation on the performance of HfZrOx-based FeFETs memory with different Zr content. The results show that the characteristics of FeFETs are influenced by proton radiation, and the extent of the influence depends on the Zr content. FeFETs with 50% Zr content exhibit minimal changes in memory window and demonstrate good endurance and retention performance.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Zongyi Yue, Guangyi Wang, Zengguang Huang, Sihua Zhong
Summary: In this study, AZO and ITO films were successfully tuned as excellent passivation layers for c-Si surfaces, achieving effective minority carrier lifetime and outstanding optical properties through the optimization of annealing temperature and interfacial silicon oxide.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Martin Hruska, Jan Kejzlar, Jaroslav Otta, Premysl Fitl, Michal Novotny, Jakub Cizek, Oksana Melikhova, Matej Micusik, Peter Machata, Martin Vrnata
Summary: This paper presents a detailed study on the hydrogen sensing capabilities of highly nanoporous black gold films. The films exhibit fast response and recovery times at low temperatures. Different levels of nanoporosity were prepared and tested to investigate the sensing properties, and it was found that nanoporous black gold is suitable for hydrogen sensing. The sensitivity of the film depends on its nanoporosity.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Yupu Wang, Gaofeng Teng, Chun To Yiu, Junyi Zhu
Summary: In the study of BM-SCO and HSCO thin films, it was found that H vacancies tend to prefer sites near the external surface or oxygen vacancy channels (OVCs), while H interstitials prefer sites of oxygen on a layer that contains six-fold coordinated Co. These findings not only enrich the understanding of complex surface phenomena of defect formation but also provide an explanation for the reversibility during phase transformation.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Jiafeng Lu, Linping Teng, Qinxiao Zhai, Chunhua Wang, Matthieu Lancry, Ye Dai, Xianglong Zeng
Summary: In this study, we achieved full control of fiber nanograting orientation by manipulating laser polarization, and tailored space variant fiber nanogratings, which expanded the diversity in fiber nanograting engineering.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Yibo Liu, Yujie Tao, Yue Liu, Qi Sun, Qinrong Lin, Kexin Kang, Qinghua Zhang, Qingjie Sun
Summary: This study investigates the wettability of the Ti-Cu-Fe multi-metal system, specifically the wetting behaviors of CuSi3 droplets on TC4 and 304SS plates. The results show that the CO2 + Ar gas atmosphere significantly affects interfacial mass transfer, thus influencing the wettability of the systems.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Jimei Liu, Fei Wang, Rong Guo, Yuqi Liu, Mengyu Zhang, Jaka Sunarso, Dong Liu
Summary: This study developed Co/MXene composites with anti-corrosion properties by varying the cobalt content. These composites exhibited remarkable electromagnetic absorption performance and high resistance to corrosion under various corrosive conditions. The study also revealed the mechanism of electron transfer from cobalt to MXene and the electromagnetic dissipation behavior originated from polarization loss alone.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Moujie Huang, Yongsong Ma, Jingbo Yang, Lingyun Xu, Hangqi Yang, Miao Wang, Xin Ma, Xin Xia, Junhao Yang, Deli Wang, Chuang Peng
Summary: Strong metal-support interactions (SMSIs) are important for enhancing catalytic activities and stability in thermal catalysis. This study demonstrates a method to create SMSIs in electrocatalysis using carbon nanotubes and Ru nanoparticles, resulting in excellent catalytic activity and stability.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Ravi Trivedi, Brinti Mondal, Nandini Garg, Brahmananda Chakraborty
Summary: This study explores the potential of biphenylene as a nanocarrier for the delivery of the anticancer drug cisplatin. It is found that biphenylene offers physical stability, rapid release rate, solubility, and bio-compatibilities compared to other nanocarriers. The adsorption of cisplatin on the surface of biphenylene involves charge transfer from cisplatin to biphenylene. The drug is shown to be released at body temperature in an acidic environment. Biphenylene also exhibits excellent cytotoxicity activity and cellular uptake of the drug. Overall, biphenylene shows promise as a potential nanocarrier for cisplatin delivery.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Hyun Jeong, Hyeong Chan Suh, Ga Hyun Cho, Rafael Salas-Montiel, Hayoung Ko, Ki Kang Kim, Mun Seok Jeong
Summary: In this study, a potential platform to enhance Raman scattering and increase the number of observable Raman modes in monolayer transition metal dichalcogenides (TMDs) was proposed. The platform consisted of large-scale arrays of gold micropillars (MPs), which were able to enhance the Raman intensity of TMDs and make difficult-to-detect Raman modes observable. The platform showed great industrial advantages and wide applicability due to its low cost, simple process, large controllable area, and short process time.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Yasir Abbas, Shafqat Ali, Sajjad Ali, Waqar Azeem, Zareen Zuhra, Haoliang Wang, Mohamed Bououdina, Zhenzhong Sun
Summary: In this study, FeOx@SPNO-C core-shell nanospheres as a catalyst for degradation of sulfamethoxazole (SMX) were successfully synthesized. The synergistic interaction between FeOx and SPNO-C, high carbon charge density, and the presence of C = O groups and N/Fe-Nx sites were found to be key factors for the enhanced degradation of SMX.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Qiaoting Yang, Yuxiao Gong, Yan Qian, Zhou-Qing Xiao, Serge Cosnier, Xue-Ji Zhang, Robert S. Marks, Dan Shan
Summary: This study proposes a hierarchical confinement strategy to design Prussian blue nanoparticles (PB NPs) with satisfactory electrocatalytic ability and stability. The catalytic synthesis of PB NPs is achieved through a hydrothermal process, and the as-prepared PB@NH2MIL exhibits efficient electronic transmission and enhanced electrocatalytic properties.
APPLIED SURFACE SCIENCE
(2024)
