Article
Materials Science, Multidisciplinary
Adnan Fareed, Julian M. Rosalie, Sourabh Kumar, Satyakam Kar, Tilmann Hickel, Sebastian Faehler, Robert Maass
Summary: Stress-induced austenite-martensite transition in Ni-Mn-Ga shape-memory alloys was studied in single crystalline austenitic thin films. The behavior of the transition varied with the thickness of the films, with smaller thickness leading to instabilities and larger thickness allowing fully reversible transformations. The findings provide insights into the effects of reduced dimensions and constraints on the transformation stress.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Zizhao Wang, Tongjun Xia, Yongzhi Shi, Zhenyu Jiang, Kaigui Zhu
Summary: This study investigates the effect of helium (He) on the mechanical properties of tungsten (W) by fabricating novel He-charged W films. Nanoindentation tests reveal that the hardness of the films increases with higher He content, and the hardness-depth relationship agrees well with the Nix-Gao model. Molecular dynamics simulations demonstrate that He bubbles facilitate the nucleation and propagation of dislocations while hindering dislocation movement, resulting in a smoother transition from elastic to plastic deformation during the indentation process.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Kefu Gan, Dingshun Yan, Shuya Zhu, Zhiming Li
Summary: Metastable high-entropy alloys exhibit excellent strength-plasticity synergy through partial dislocation-assisted twinning and/or displacive transformation. This study provides quantitative insights into dislocation nucleation and the effects of interstitial alloying elements using instrumented nanoindentation experiments and statistical physical modeling, shedding light on the fundamental mechanisms in these emerging materials.
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
Materials Science, Multidisciplinary
Shuo Sun, Yang Yang, Chenxu Han, Guixun Sun, Yan Chen, Hongxiang Zong, Jiangjiang Hu, Shuang Han, Xiaozhou Liao, Xiangdong Ding, Jianshe Lian
Summary: The incipient plasticity and dislocation behavior in a nanocrystalline CrCoNi medium-entropy alloy were systematically investigated. The grain boundaries (GBs) were found to have significant effects on the initial stages of plastic deformation. The chemically complex GBs hindered diffusive GB activities but facilitated dislocation nucleation. Moreover, the extremely small grain sizes and high-volume fraction of GBs severely restricted the lengths of dislocation source and the sizes of dislocation loop.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
L. J. Zhang, P. F. Yu, C. Z. Zhang, J. T. Fan, G. Li
Summary: The stress-dependent incipient plasticity was investigated in a face-centered-cubic-based Al0.3CoCrFeNi multi-principal element alloy with nano-scaled phase separation. The bimodal distribution of maximum shear stress was found to be associated with different dislocation nucleation sites, which can be used to characterize the structural heterogeneity of the alloy. The activation volume and dislocation nucleation rate were calculated to further investigate the different dislocation nucleation mechanisms.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Quanqing Zeng, Kefu Gan, Fei Chen, Dongyao Wang, Songsheng Zeng
Summary: This study investigates the interstitial concentration effects of carbon atoms on the mechanical properties of FeNiCr medium-entropy alloys using nanoindentation. The results show that interstitial atoms play a role in triggering plasticity and increasing the average maximum shear stress. Moreover, interstitial carbon atoms hinder the movement of dislocations, which suppresses plastic deformation. This study provides important insights into the interstitial effects on the mechanical properties of multicomponent alloys and can assist in the development of new strengthening strategies for structural materials with remarkable performance.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
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
Chemistry, Physical
Umamahesh Thupakula, Priya Laha, Gertjan Lippertz, Koen Schouteden, Asteriona-Maria Netsou, Aleksandr Seliverstov, Herman Terryn, Lino M. C. Pereira, Chris Van Haesendonck
Summary: Two-dimensional allotropes of tellurium, known as tellurene, have recently attracted attention in materials research due to their exotic properties in ultrathin form. This study reports the observation of three different 2D superstructures of tellurene on Au(111) surfaces using an alternative experimental deposition approach. The superstructures were characterized using scanning tunneling microscopy and spectroscopy, Auger electron spectroscopy, and field emission AES. The study found that the formation of these superstructures led to changes in the surface reconstruction of Au(111), and the electronic properties of the tellurium atoms showed a strong dependence on their structural arrangement. The emergence of band gaps with a p-type charge character was observed in two of the superstructures on Au(111).
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Xun Cao, Dongdong Peng, Cao Wu, Yongmin He, Chaojiang Li, Bowei Zhang, Changcun Han, Junsheng Wu, Zheng Liu, Yizhong Huang
Summary: In this study, nanoimprint lithography was used to fabricate flexible Au micro-array electrodes with nearly 100% coverage, allowing for direct visualization of atomic-scale three-dimensional nanostructures and crystal growth. The research found that Au micro-arrays outperformed planar samples in ethanol oxidation reaction, with higher mesh grade arrays showing greater active site utilization ratios. Further improvement in active site utilization is expected to lead to enhanced electrocatalytic performance and potential applications in direct ethanol fuel cells.
Article
Chemistry, Multidisciplinary
Mingjun Zhong, Qimeng Wu, Liang Ma, Jie Li, Yifan Wang, Yansong Wang, Xin Li, Yajie Zhang, Jingtao Lue, Yongfeng Wang
Summary: In this study, Fe-tetraphenyl porphyrin (FeTPP) was synthesized on the surface and characterized using low-temperature scanning tunneling microscopy and spectroscopy. The research revealed that FeTPP exhibits robust magnetic properties on metallic substrates and undergoes structural distortion upon adsorption. The spin distribution of FeTPP and the electron transport mechanism were investigated through density functional theory calculations.
CHINESE CHEMICAL LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Jalil Shah, W. Wang, Hafiz M. Sohail, R. I. G. Uhrberg
Summary: Atomic and electronic structure investigations were conducted on the substitutional Au2Sn surface alloy formed on Au(111). The study revealed a specific local periodic structure with a longer periodicity compared to clean Au(111), as well as a band split phenomenon in the alloy surface, attributed to its unique atomic structure.
Article
Chemistry, Physical
Yiming Song, Antoine Hinaut, Sebastian Scherb, Yves Pellmont, Remy Pawlak, Shuyu Huang, Zhao Liu, Thilo Glatzel, Ernst Meyer
Summary: The structural and superlubric properties of single layer MoS2 on Au(1 1 1) forming moire superlattice structures have been investigated. It was found that there is a superlubric regime between the tip apex and the moire corrugated MoS2 surface, with an ultralow friction force that remains independent from normal load. These findings offer a new avenue for minimizing friction in nanoscale electronic devices and aerospace lubrication.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Nassar Doudin, Kayahan Saritas, Min Li, Inga Ennen, J. Anibal Boscoboinik, Petr Dementyev, Andreas Hutten, Sohrab Ismail-Beigi, Eric I. Altman
Summary: The intrinsic properties of two-dimensional SiO2 were revealed by forming the material on inert Au(111). The formation of a crystalline phase consisting of tetrahedral [SiO4] building units was enabled by SiO deposition. The twisting and rippling of the 2D kagome lattice provide 2D silica with the flexibility to adapt to strain and changes in the crystallographic direction without introducing defects.
ACS MATERIALS LETTERS
(2022)
Article
Multidisciplinary Sciences
Pai Li, Feng Ding
Summary: In this study, a machine learning force field was trained to explore the atomic-level explanation of herringbone reconstruction on the Au(111) surface. It was found that the lattice deformation in deeper layers of Au plays a critical role in the herringbone reconstruction, and the herringbone reconstruction is energetically favored over stripe reconstruction when the slab thickness exceeds 12 atomic layers. Additionally, the study revealed the high stability of herringbone reconstruction at high temperatures, and a slight strain can induce a transition from herringbone to stripe pattern, consistent with experimental observations.
Article
Instruments & Instrumentation
Omur E. Dagdeviren, Yoichi Miyahara, Aaron Mascaro, Peter Grutter
REVIEW OF SCIENTIFIC INSTRUMENTS
(2019)
Article
Chemistry, Multidisciplinary
Antoine Roy-Gobeil, Yoichi Miyahara, Kirk H. Bevan, Peter Grutter
Article
Optics
Madeleine Anthonisen, Yuning Zhang, M. Hussain Sangji, Peter Grutter
Article
Multidisciplinary Sciences
Zeno Schumacher, Rasa Rejali, Raphael Pachlatko, Andreas Spielhofer, Philipp Nagler, Yoichi Miyahara, David G. Cooke, Peter Grutter
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Chemistry, Multidisciplinary
Omur E. Dagdeviren, Aaron Mascaro, Shuaishuai Yuan, Javad Shirani, Kirk H. Bevan, Peter Grutter
Article
Nanoscience & Nanotechnology
Omur E. Dagdeviren, Ogulcan Acikgoz, Peter Grutter, Mehmet Z. Baykara
NPJ 2D MATERIALS AND APPLICATIONS
(2020)
Article
Chemistry, Multidisciplinary
Khadija Yazda, Katarina Bleau, Yuning Zhang, Xavier Capaldi, Thomas St-Denis, Peter Grutter, Walter W. Reisner
Summary: The study shows that high osmotic power density can be obtained in systems that do not possess the thinness of atomic monolayers by combining a new pore fabrication method with a hybrid membrane technology. The high osmotic performance is attributed to charge separation induced by the highly charged hBN surface. Investigation into the effects of pore-pore interaction reveals that an optimum pore-to-pore spacing of approximately 500 nm is needed for maintaining an efficient selective transport mechanism.
Article
Chemistry, Multidisciplinary
Zeno Schumacher, Rasa Rejali, Megan Cowie, Andreas Spielhofer, Yoichi Miyahara, Peter Grutter
Summary: Inducing an inversion layer in organic semiconductors is a critical achievement for producing OFET devices, and a new pulsed bias technique is developed to characterize the dopant type of different organic material systems. This technique accurately identifies n-doping in pentacene/PTCDI heterostructure, demonstrating that nanometer-scale lateral extent and thickness are sufficient for an OFET device to operate in the inversion regime.
Article
Chemistry, Multidisciplinary
Omur E. Dagdeviren, Daniel Glass, Riccardo Sapienza, Emiliano Cortes, Stefan A. Maier, Ivan P. Parkin, Peter Grutter, Raul Quesada-Cabrera
Summary: The impact of photoinduced surface oxygen vacancies (PI-SOV) on the dynamics of hole migration in MOS films, such as titanium dioxide, was measured using time-resolved atomic force microscopy. The results show that the time constant associated with hole migration is strongly affected by PI-SOV in a reversible manner, providing insights into hole dynamics physics and enabling the development of emerging technologies.
Article
Nanoscience & Nanotechnology
Megan Cowie, Rikke Plougmann, Yacine Benkirane, Leonard Schue, Zeno Schumacher, Peter Grutter
Summary: Transition metal dichalcogenides (TMDCs) have important properties for optoelectronic, photovoltaic and photoelectrochemical applications. Different methods for measuring the height of exfoliated MoSe2 flakes on SiO2 surfaces using photoluminescence spectroscopy, Raman spectroscopy, and atomic force microscopy (AFM) show significant discrepancies. The often overlooked electrostatic forces can also mislead the AFM height measurements of MoSe2 flakes.
Article
Materials Science, Multidisciplinary
Megan Cowie, Rikke Plougmann, Zeno Schumacher, Peter Gruetter
Summary: This paper experimentally demonstrates two-state fluctuations in a metal-insulator-semiconductor device made of a metallic atomic force microscopy tip, vacuum gap, and multilayer MoSe2 sample. The research shows that noise in this device depends on the bias due to the bias-dependent surface potential, and it is not necessary for the frequency or magnitude of individual dopant fluctuations to be bias-dependent. Additionally, spatial nonhomogeneities in band bending timescales are measured.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Galih R. R. Suwito, Vladimir G. G. Dubrovskii, Zixiao Zhang, Weizhen Wang, Sofiane Haffouz, Dan Dalacu, Philip J. J. Poole, Peter Grutter, Nathaniel J. J. Quitoriano
Summary: Controlling the size of the liquid-vapour interface allows for the control of the morphology and composition of semiconductor nano- and micro-structures. Si-Ge semiconductor nanostructures were fabricated using photolithographically defined micro-crucibles on Si substrates. The morphology and composition of these structures depend on the size of the liquid-vapour interface during the CVD deposition of Ge, resulting in the formation of unique semiconductor nanostructures with different sizes of openings.
Article
Chemistry, Physical
Yuning Zhang, Yoichi Miyahara, Nassim Derriche, Wayne Yang, Khadija Yazda, Xavier Capaldi, Zezhou Liu, Peter Grutter, Walter Reisner
