Article
Chemistry, Multidisciplinary
Gang Wang, Yun-Peng Wang, Songge Li, Qishuo Yang, Daiyue Li, Sokrates T. Pantelides, Junhao Lin
Summary: This study selectively created sulfur and MoSn point defects in monolayer MoS2 using helium and gallium-ion-beam lithography, and found that these defects can reduce the stiffness of the monolayer while enhancing its fracture toughness. By monitoring the atomic structure of the cracks, distinct atomic structures of the cracks and fracture behaviors were observed in the two types of defect-containing monolayer MoS2. Molecular dynamics simulations revealed that individual S and MoSn point defects play a key role in the fracture process and contribute to the enhanced fracture toughness.
Article
Chemistry, Physical
Michal Bodik, Michaela Sojkova, Martin Hulman, Milan Tapajna, Martin Truchly, Karol Vegso, Matej Jergel, Eva Majkova, Marianna Spankova, Peter Siffalovic
Summary: The tribological properties of MoS2 films can be optimized by adjusting the crystallographic orientation, leading to different friction behaviors. Horizontally oriented MoS2 sheets exhibit a lower coefficient of friction compared to vertically oriented sheets.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Jae Hwan Jeong, Yeonjoon Jung, Jang-Ung Park, Gwan-Hyoung Lee
Summary: This study investigates the gate-tunable electrostatic friction of grain boundaries (GBs) in chemically vapor deposition (CVD)-grown MoS2 films. It is found that the electrostatic friction is generated by the Coulomb interaction between the tip and the carriers of MoS2, which is related to the localized band structure of GBs. The results show a strong correlation between electrostatic friction and localized band structure, providing a novel method for identifying and characterizing GBs in polycrystalline 2D materials.
Article
Chemistry, Multidisciplinary
Emanuela Schiliro, Raffaella Lo Nigro, Salvatore E. Panasci, Simonpietro Agnello, Marco Cannas, Franco M. Gelardi, Fabrizio Roccaforte, Filippo Giannazzo
Summary: The authors demonstrated the growth of highly homogeneous and ultrathin Al2O3 films with good insulating properties on monolayer MoS2 exfoliated on gold using atomic layer deposition. The study showed that the nucleation process of the high-k film is better on the 1L MoS2/Au system compared to common insulating substrates, and the density of Al2O3 on bilayer MoS2 is significantly reduced. Raman and photoluminescence spectroscopy indicated p-type doping and tensile strain in the MoS2 induced by the Au substrate after Al2O3 deposition.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Mechanics
Vasilina A. Lapitskaya, Tatyana A. Kuznetsova, Anastasiya Khabarava, Sergei A. Chizhik, Sergei M. Aizikovich, Evgeniy Sadyrin, Boris Mitrin, Weifu Sun
Summary: In this study, the crack resistance of silicon wafers was evaluated using the Vickers tip indentation method, and parameters such as critical stress intensity factor K-IG and fracture energy G(IG) were determined. The correlation of these parameters with specific surface energy, Young's modulus E, and microhardness H was analyzed, along with the evaluation of E and H values using nanoindentation. The dependence of K-IG and G(IG) on the load of silicon wafers of different crystallographic orientations was obtained.
ENGINEERING FRACTURE MECHANICS
(2022)
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
Multidisciplinary Sciences
Hewan Li, Jian Liu, Laigui Wang, Tianjiao Ren
Summary: This paper proposes a method to analyze rock samples with different inclination angles from the standpoint of energy, using the bond-base peridynamic theory and the PMB model of brittle materials, combined with laboratory experiments. The whole process of shearing is analyzed, and the LAMMPS software is used to simulate the internal energy change of rock-like materials under shear conditions. The result shows that prefabricated cracks and the inclination of cracks are important factors for specimen damage, which has important theoretical value for rock mechanics research. The research results can reduce the occurrence of rock burst accidents, the difficulty of mine support, and the cost of mining engineering, as well as improve mine safety levels.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Mechanical
Masoud Yekani Fard, Alek Pensky
Summary: This study focuses on the size of multi-wall carbon nanotube (MWCNT) bundles and their interphase with the matrix, as well as the influence of single layer and multiple layers of carbon fiber nanocomposites on fracture toughness. The AFM PFQNM technique was used to characterize the CNT bundle size and interphase. The results showed that laminates with 1wt% CNT in all laminas had higher fracture energy consistency compared to reference and CNT laminates.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Serrae N. Reed-Lingenfelter, Yifeng Chen, Milad Yarali, David J. Charboneau, Julia B. Curley, David J. Hynek, Mengjing Wang, Natalie L. Williams, Nilay Hazari, Su Ying Quek, Judy J. Cha
Summary: The surface functionalization of two-dimensional (2D) material MoS2 with organic electron donors (OEDs) has been successfully achieved using the novel molecular dopant Me-OED, which demonstrates record-breaking molecular doping with significantly higher carrier density compared to other OEDs. The impressive doping power of Me-OED is attributed to its compact size, enabling high surface coverage and molecular interactions with MoS2.
Article
Nanoscience & Nanotechnology
Keivan Asadi, Junghoon Yeom, Hanna Cho
Summary: Investigating internal resonance (IR) mechanisms in micro/nanoresonators reveals that intermodal coupling between second and third flexural modes in asymmetric structures provides an optimal condition for strong IR, with high energy transfer to the resonated mode. This study introduces design strategies that can be easily integrated into typical micro/nanoelectromechanical systems, offering potential for paradigm-shifting applications in micro/nanosystems.
MICROSYSTEMS & NANOENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Saima A. Sumaiya, Jun Liu, Mehmet Z. Baykara
Summary: The atomic-scale structure and properties of material surfaces play a significant role in various chemical and mechanical phenomena. However, current methods for characterizing surfaces at the atomic level are limited by the need for strict environmental conditions. This study presents a new approach utilizing conductive atomic force microscopy (C-AFM) to achieve atomic-resolution surface imaging under ambient conditions. The results demonstrate the capability of this method to manipulate and observe surface structure and electronics in real time, with wide-ranging applicability.
Article
Nanoscience & Nanotechnology
Le Lei, Yingzhuo Lun, Feiyue Cao, Lan Meng, Shuya Xing, Jianfeng Guo, Haoyu Dong, Shangzhi Gu, Kunqi Xu, Sabir Hussain, Yan Jun Li, Yasuhiro Sugawara, Fei Pang, Wei Ji, Jiawang Hong, Rui Xu, Zhihai Cheng
Summary: This study investigated the strain-induced structure and properties of CVD-grown MoS2 flakes, revealing sharp-corner regions in small flakes and vein-like nanoripple structures in large flakes. Through experiments and estimations, the critical size of these two types of flakes was roughly estimated at about 17 µm, providing new insights into the design of devices based on 2D materials.
Editorial Material
Multidisciplinary Sciences
Telmo O. Paiva, Albertus Viljoen, Yves F. Dufrene
Summary: Advancements in atomic force microscopy (AFM) techniques and methodologies in microbiology have enhanced our understanding of microbial cell surfaces. Recent studies have shown that AFM imaging of cells and membranes at or near molecular resolution enables detailed visualization of membrane-drug interactions.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Ogulcan Acikgoz, Enrique Guerrero, Alper Yanilmaz, Omur E. Dagdeviren, Cem Celebi, David A. Strubbe, Mehmet Z. Baykara
Summary: In this study, atomic force microscopy was used to measure the friction on Re-doped MoS2. Unlike the common observation of decreasing friction with increasing number of layers in two-dimensional materials, Re-doped MoS2 exhibits friction that is inversely proportional to the number of layers. Raman spectroscopy measurements and ab initio calculations reveal that this phenomenon is related to Re intercalation, with an increase in out-of-plane stiffness inversely correlating with the number of layers as the physical mechanism behind this remarkable observation, revealing a distinctive regime of puckering for 2D materials.
Article
Physics, Applied
Shiquan Lin, Zhong Lin Wang
Summary: Inspired by TENG, scanning TENG is proposed for local surface charge density measurement using atomic force microscopy. The technique taps a conductive tip above a charged dielectric surface to induce an AC, with Fourier analysis showing a linear relation to surface charge density. Results demonstrate its power in probing nanoscale charge transfer in contact-electrification.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Ryan Selhorst, Zhuohang Yu, David Moore, Jie Jiang, Michael A. Susner, Nicholas R. Glavin, Ruth Pachter, Mauricio Terrones, Benji Maruyama, Rahul Rao
Summary: Layered Transition Metal Dichalcogenides (TMDs) are important materials with a diverse range of optoelectronic properties. This study investigates the spatial tailoring of TMDs through electron-beam patterning, achieving high resolution and demonstrating potential for nanoscale functionalization. The modulated properties were found to be dependent on various parameters, and the results were confirmed through spectroscopic analysis and density functional theory modeling. This research provides a robust method for property modulation and functionalization of TMDs at the nanoscale.
Editorial Material
Chemistry, Physical
Nianjun Yang, Mauricio Terrones
Article
Chemistry, Multidisciplinary
Min Fu, Wei Chen, Yu Lei, Hao Yu, Yuxiao Lin, Mauricio Terrones
Summary: A general biomimetic mineralization synthetic strategy was proposed to synthesize ferrite quantum dot/graphene heterostructures. The optimized heterostructure exhibited exceptional capacitance and cycling performance, indicating its potential as advanced electrode materials for supercapacitors.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Katherine L. Thompson, Rowan R. Katzbaer, Mauricio Terrones, Raymond E. Schaak
Summary: Ion exchange reactions of colloidal nanoparticles allow for modification of composition while maintaining morphology and crystal structure, which is crucial for tuning properties and producing otherwise inaccessible materials. In this study, tellurium anion exchange of copper selenide nanoparticles was conducted, resulting in the formation of solid solutions with tunable compositions. The post-exchange reactivity of the solid solution nanoparticles, including transformation of composition, surface chemistry, and colloidal dispersibility, was observed due to the apparent metastability of the product.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Jie Fang, Suichu Huang, Kan Yao, Tianyi Zhang, Mauricio Terrones, Wentao Huang, Yunlu Pan, Yuebing Zheng
Summary: Tunable exciton-photon couplings have been demonstrated in monolayer TMDs, showing strong bright-exciton-photon couplings and revealing the novel interactions between bright and dark exciton-photon hybrids in a single optical cavity. The waveguide mode can be tuned in wavelengths by controlling the spacer thickness, and the relative contribution from the antenna mode coupled with dark excitons can be dynamically enlarged by increasing the excitation angle. This study opens new possibilities in tunable QED and provides insights into the coexistence of bright and dark exciton-photon couplings.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Ji-Hoon Park, Ang-Yu Lu, Mohammad Mahdi Tavakoli, Na Yeon Kim, Ming-Hui Chiu, Hongwei Liu, Tianyi Zhang, Zhien Wang, Jiangtao Wang, Luiz Gustavo Pimenta Martins, Zhengtang Luo, Miaofang Chi, Jianwei Miao, Jing Kong
Summary: Wafer-scale monolayer two-dimensional (2D) materials have been achieved through epitaxial chemical vapor deposition (CVD) in recent years. To scale up the synthesis of 2D materials, a comprehensive analysis of the growth dynamics and its dependence on the growth parameters is important. However, most studies on CVD-grown 2D materials have considered each parameter as an independent variable, which is not comprehensive for growth optimization. In this study, monolayer hexagonal boron nitride (hBN) was synthesized on single-crystalline Cu(111) using CVD, and the growth parameters were varied to regulate hBN domain sizes. The correlation between two growth parameters was explored, and a more comprehensive understanding of the growth mechanism for 2D materials was provided through machine learning.
Article
Chemistry, Multidisciplinary
Pouria Fattahi, Yin-Ting Yeh, Tiankai Zhao, Mousa Younesi, Changjin Huang, Mauricio Terrones, Siyang Zheng, Justin L. Brown, Dan Dongeun Huh, Sulin Zhang, Peter J. Butler
Summary: Endothelial cells (ECs) exhibit different shapes and mechanical properties depending on the flow in their environment, and these factors affect the uptake of therapeutic nanoparticles (NPs). Cells with elongated shape and higher stiffness show higher uptake of NPs, while those with polygonal shape and lower stiffness show lower uptake. The elongated cells in areas of high laminar shear exhibit less NP uptake compared to nonelongated cells in chaotic, lower shear areas. These findings suggest that manipulating the morphology and mechanical properties of ECs can enhance the uptake of therapeutic NPs for preventing atherosclerosis.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Yolanda Manzanares-Negro, Jiamin Quan, Maedeh Rassekh, Mohammed Moaied, Xiaoqin Li, Pablo Ares, Juan Jose Palacios, Julio Gomez-Herrero, Cristina Gomez-Navarro
Summary: The performance of electronic and optoelectronic devices is strongly influenced by charge carrier injection through metal-semiconductor contacts. A new strategy to reduce the contact resistance of MoS2 through local pressurization is reported. Theoretical simulations and experimental results show significant improvements in contact resistance and field-effect mobility of MoS2 devices under high pressure conditions. This research suggests a novel approach for improving the performance of MoS2 devices and exploring emergent phenomena through mechano-electric modulation.
Article
Chemistry, Physical
Shannon McGee, Andres Fest, Cierra Chandler, Nabila N. Nova, Yu Lei, James Goff, Susan B. Sinnott, Ismaila Dabo, Mauricio Terrones, Lauren D. Zarzar
Summary: In this study, we synthesized multimetal catalysts using a laser synthesis method and found that adding a small amount of chromium to the catalyst can enhance the hydrogen evolution efficiency. This research provides new insights for future electrocatalytic design.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jie Fang, Kan Yao, Mingsong Wang, Zhuohang Yu, Tianyi Zhang, Taizhi Jiang, Suichu Huang, Brian A. Korgel, Mauricio Terrones, Andrea Alu, Yuebing Zheng
Summary: In this study, we achieved on-demand exciton-polariton emission from a wide range of TMDs at room temperature by hybridizing excitons with broadband Mie resonances. The system demonstrated stable polaritonic photoluminescence and multiple Rabi splittings.
Article
Materials Science, Multidisciplinary
Gowtham Polumati, Barbara A. Muniz Martinez, Chandra Sekhar Reddy Kolli, Venkatarao Selamneni, Mario Flores Salazar, David Emanuel Sanchez, Andres Fest Carreno, Mauricio Terrones, Andres De Luna Bugallo, Parikshit Sahatiya
Summary: This work demonstrates the band-type engineering and charge transport mechanism of vertically stacked monolayers of MoS2-ReS2 under visible light illumination. The study investigates the impact of stacking order on band alignment and validates the formation of the vertically stacked heterostructure. The results show the significant role of stacking configuration in the optoelectronic properties.
Article
Chemistry, Multidisciplinary
Tianyi Zhang, Andrew Voshell, Da Zhou, Zachary D. Ward, Zhuohang Yu, Mingzu Liu, Kevin O. Diaz Aponte, Tomotaroh Granzier-Nakajima, Yu Lei, He Liu, Humberto Terrones, Ana Laura Elias, Mukti Rana, Mauricio Terrones
Summary: The ultraflat and dangling bond-free features of 2D transition metal dichalcogenides (TMDs) allow their integration with 3D substrates, forming mixed-dimensional 2D/3D heterostructures. This study investigates the impact of sample preparation conditions and different substrates on the photoluminescence (PL) and other optoelectronic properties of monolayer TMD/Ge heterostructures. The results show that post-transfer low-pressure annealing improves interface quality and homogenizes the PL signal, and the integration of TMD on Ge significantly quenches the PL intensity.
Article
Chemistry, Physical
F. D. V. Araujo, F. W. N. Silva, T. Zhang, C. Zhou, Zhong Lin, Nestor Perea-Lopez, Samuel F. Rodrigues, Mauricio Terrones, Antonio Gomes Souza Filho, R. S. Alencar, Bartolomeu C. Viana
Summary: In this study, the behavior of monolayer WS2 on a drilled Si3N4 substrate was investigated through Raman spectroscopy and photoluminescence measurements. It was found that the Si3N4 substrate affects the optical properties of monolayer WS2. Density functional theory and quantum molecular dynamics simulations showed that strain and charge transfer mechanism are important factors for the decrease in photoluminescence.
Article
Chemistry, Multidisciplinary
Yolanda Manzanares-Negro, Aitor Zambudio, Guillermo Lopez-Polin, Soumya Sarkar, Manish Chhowalla, Julio Gomez-Herrero, Cristina Gomez-Navarro
Summary: This study investigates the mechanical reliability and fatigue response of MoS2 with controlled atomic vacancies. The research finds that high-quality MoS2 demonstrates exceptional fatigue response, while the introduction of atomic defect densities reduces the fatigue strength.
