Article
Chemistry, Multidisciplinary
Kaihui Li, Feiping Xiao, Wen Guan, Yulong Xiao, Chang Xu, Jinding Zhang, Chenfang Lin, Dong Li, Qingjun Tong, Si-Yu Li, Anlian Pan
Summary: Moire superlattices exhibit a magnification effect and are sensitive to both external disturbances and internal atomic reconstructions. Long-wavelength WS2 superlattices can be reconstructed into various moire morphologies, ranging from regular hexagons to heavily deformed shapes. The interaction between external nonuniform heterostrain and intrinsic atomic reconstruction is responsible for this interesting evolution of moire structures.
Article
Chemistry, Multidisciplinary
Nicolas Neel, Joerg Kroeger
Summary: The study revealed that the formation of a chemical bond between a CO molecule and a Cu(111) surface is accompanied by bending of the molecular probe due to van der Waals attraction and Pauli repulsion, resulting in characteristic changes in the vertical force between CO and Cu(111) as a function of molecule-surface distance. Experimental data were successfully reproduced by model calculations, shedding new light on vertical-force extrema in scanning probe experiments.
Article
Chemistry, Multidisciplinary
Yuhiro Segawa, Kenji Yamazaki, Jun Yamasaki, Kazutoshi Gohara
Summary: A new method for measuring the 3D atomic structure of free-standing graphene ripples using TEM is proposed and experimentally validated. The specimen in the experiment was found to be moving upward, and the ripple was approximated as a composite of sinusoidal waves while measuring the time dependence of its height and lateral size.
Review
Chemistry, Physical
Chunlei Yang, Tianhui Su, Yanbo Hua, Liming Zhang
Summary: This review summarizes the latest results of electrochemical scanning probe microscopy techniques in studying the interfacial properties of electrocatalysts and photoelectrodes, and offers some perspectives on future research directions.
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
Chemistry, Physical
Lu Cao, Yang Song, Ya-Bin Liu, Qi Zheng, Guangyuan Han, Wenyao Liu, Meng Li, Hui Chen, Yuqing Xing, Guang-Han Cao, Hong Ding, Xiao Lin, Shixuan Du, Yu-Yang Zhang, Geng Li, Ziqiang Wang, Hong-Jun Gao
Summary: CaKFe4As4, a new type of iron-based superconductor, shows promise as a platform for observing Majorana zero modes. Using scanning tunneling microscopy/spectroscopy, two types of surface structures were identified, providing insight for future studies on the surface of iron-pnictide superconductors.
Article
Chemistry, Physical
Liangguang Jia, Fei Gao, Yu Zhang, Yaoyao Chen, Baofei Hou, Zeping Huang, Quanzhen Zhang, Xu Wu, Liwei Liu, Shiwu Gao, Mads Brandbyge, Hong-Jun Gao, Yeliang Wang
Summary: This study reports the influence of defects in vdW crystals on the local atomic configurations and interlayer coupling. The findings show that Se vacancies in few-layer NbSe2 can cause atomic distortions and generate in-gap states in single-layer NbSe2. Moreover, these vacancies lead to a significant suppression of interlayer coupling in the bilayer system.
Article
Chemistry, Physical
Wenhao Zhang, Degong Ding, Jingjing Gao, Kunliang Bu, Zongxiu Wu, Li Wang, Fangsen Li, Wei Wang, Xuan Luo, Wenjian Lu, Chuanhong Jin, Yuping Sun, Yi Yin
Summary: Intercalation is an effective method to modify physical properties and induce novel electronic states of transition metal dichalcogenide materials. In this study, the successful synthesis of copper-intercalated 1T-TaS2 is reported, and the structural and electronic modifications are characterized using various techniques. The intercalated copper atom suppresses the commensurate charge density wave phase and two specific electronic modulations are discovered in the near-commensurate charge density wave phase.
Article
Chemistry, Multidisciplinary
Yuan Zhang, Daniel J. Trainer, Badri Narayanan, Yang Li, Anh T. Ngo, Sushila Khadka, Arnab Neogi, Brandon Fisher, Larry A. Curtiss, Subramanian K. R. S. Sankaranarayanan, Saw Wai Hla
Summary: By using a q+ atomic force microscopy at low temperature, researchers observed lateral force anisotropy of a sexiphenyl molecule moving on an atomically flat Ag(111) surface. The one-dimensional shape of the molecule was identified as the origin of this phenomenon, which was confirmed through molecular dynamics simulations. This finding may have significant implications for atomic scale frictional phenomena on materials surfaces.
Article
Chemistry, Multidisciplinary
Leonard-Alexander Lieske, Mario Commodo, Jacob W. W. Martin, Katharina Kaiser, Vasiliki Benekou, Patrizia Minutolo, Andrea D'Anna, Leo Gross
Summary: This study used high-resolution atomic force microscopy and scanning tunneling microscopy to investigate the initial formation of soot in flames. The research revealed the atomic structure and orbital densities of single soot molecules, as well as the formation mechanisms of aromatic compounds through cross-linking and cyclodehydrogenation reactions. The findings also detected the presence of nonhexagonal rings in flame aromatics, indicating simultaneous growth through aromatic cross-linking/cyclodehydrogenation and hydrogen abstraction acetylene addition. Furthermore, the study identified three classes of open-shell π-radical species and their implications for soot formation and cleaner combustion.
Article
Chemistry, Multidisciplinary
Xinzuo Sun, Yan Chen, Dongyang Zhao, Takashi Taniguchi, Kenji Watanabe, Jianlu Wang, Jiamin Xue
Summary: This study demonstrates the significant modulation of the band structure of few-layer MoS2 using a ferroelectric P(VDF-TrFE) gate. The fully polarized P(VDF-TrFE) gate creates an electric field of up to 0.62 V/nm through the MoS2 layers, which greatly affects the band structure. The experimental results show a strong band bending effect and an enlarged energy separation between quantum-well subbands. This study intuitively showcases the potential of ferroelectric gates in manipulating the band structure of 2D materials.
Article
Chemistry, Multidisciplinary
Yi-Ying Sung, Harmina Vejayan, Christopher J. Baddeley, Neville V. Richardson, Federico Grillo, Renald Schaub
Summary: On-surface synthesis with designer precursor molecules is an effective method for preparing graphene nanoribbons (GNRs) with tunable electronic properties. The band gap of GNRs doped with heteroatoms remains unchanged, but hydrogenation can engineer a tunable band gap. Surface-confined hydrogenation studies on 7-armchair GNRs grown on Au(111) surfaces reveal a self-limited hydrogenation process. The electronic properties of the GNR/Au(111) system can be modified by edge and basal-plane hydrogenation, and a mechanism for the hydrogenation process is proposed.
Article
Chemistry, Multidisciplinary
Euihwan Do, Jae Whan Park, Oleksandr Stetsovych, Pavel Jelinek, Han Woong Yeom
Summary: In this study, the low-temperature structural distortion of a one-dimensional electronic system formed on Au-decorated vicinal silicon surfaces is unambiguously identified using high-resolution atomic force microscopy and scanning tunneling microscopy. The buckling of the step-edge Si chains, forming trimer unit cells, is found to be the most important structural element of this surface. This observation supports the recent model of rehybridized dangling bonds and contradicts the previously proposed antiferromagnetic spin ordering.
Article
Chemistry, Multidisciplinary
Wenze Gao, Faming Kang, Xia Qiu, Zewei Yi, Lina Shang, Mengxi Liu, Xiaohui Qiu, Yi Luo, Wei Xu
Summary: The configuration of carbon allotropes in condensed phases, whether linear or cyclic, has long been a mystery. In this study, a molecule with a C-6 skeleton was designed to address this issue. The C-6 ring intermediate resulting from complete debromination was found to be energetically unstable at room temperature. It subsequently underwent a ring-opening process and polymerized into an organometallic polyyne.
Article
Chemistry, Multidisciplinary
Xunshan Liu, Adam Matej, Tim Kratky, Jesus Mendieta-Moreno, Sebastian Guenther, Pingo Mutombo, Silvio Decurtins, Ulrich Aschauer, Jascha Repp, Pavel Jelinek, Shi-Xia Liu, Laerte L. Patera
Summary: In this study, selective C-H activation of hexaazatriphenylene by Scholl reaction was reported for the first time, achieving dehydrogenative C-C couplings. The formation of one-dimensional polymers with a double-chain structure was revealed using low-temperature scanning tunneling microscopy and atomic force microscopy. Density functional theory calculations rationalized the growth process, highlighting the cooperative catalytic action of Na and Ag adatoms in steering the C-H selectivity for polymerization.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)