Article
Materials Science, Multidisciplinary
Dan Mu, Wei Zhou, Yundan Liu, Jin Li, Ming Yang, Jincheng Zhuang, Yi Du, Jianxin Zhong
Summary: The study reported the growth of controllable BiI3 thin film on graphene-terminated substrate using molecular beam epitaxy method, and investigated its growth kinetic processes and crystalline properties through scanning tunneling microscopy and spectroscopy. The results revealed a discrepancy in bandgap values for monolayer and few-layer BiI3 due to the edge effect, providing insights into fabricating high-quality BiI3 films and understanding its bandgap properties.
MATERIALS TODAY PHYSICS
(2021)
Article
Chemistry, Physical
Nan Hong, Qishen Zhao, Dongmei Chen, Kenneth M. Liechti, Wei Li
Summary: A novel method to estimate the adhesion energy of as-grown graphene during the roll-to-roll dry transfer process is developed, and an energy balance model is established to derive the adhesion energy based on web tension and bending curvature measurements. Experimental results show that the adhesion energy of as-grown graphene on copper foil depends on the peeling front geometry and ranges from 1.22 J/m2 to 2.58 J/m2. This method is compatible with large-scale graphene transfer processes and can be used for monitoring and controlling.
Article
Nanoscience & Nanotechnology
Chengxin Jiang, Lingxiu Chen, Huishan Wang, Chen Chen, Xiujun Wang, Ziqiang Kong, Yibo Wang, Haomin Wang, Xiaoming Xie
Summary: Graphene on hexagonal boron nitride (h-BN) demonstrates excellent electrical properties, which are affected by its domain size and boundaries. Chemical vapor deposition (CVD) is a hopeful method for large graphene crystal growth, but increasing the coverage of monolayer graphene on h-BN remains a challenge due to weak control of nucleation and vertical growth. In this study, an auxiliary source strategy using silicon carbide and methyl methacrylate is adopted to enhance graphene nucleation density and achieve continuous graphene films on h-BN. By optimizing the growth temperature, vertical accumulation of graphitic materials can be suppressed. This work provides an effective approach for preparing continuous graphene film on h-BN and offers insights for the growth of high-quality graphene.
Article
Nanoscience & Nanotechnology
Mengqing Yin, Liqiong Wu, Hua Chen, Xiaohui Zhang, Wei Wang, Zhaoping Liu
Summary: This paper investigates the performance of transparent UHF RFID tags fabricated with graphene films. Experimental tests reveal that increasing the number of graphene film layers can improve the reading distance of the tags. Moreover, the study demonstrates that transparent graphene-based RFID tags possess good flexibility and stability.
Article
Multidisciplinary Sciences
Ata Keskekler, Oriel Shoshani, Martin Lee, Herre S. J. van der Zant, Peter G. Steeneken, Farbod Alijani
Summary: The experimental study shows enhanced nonlinear damping in graphene nanodrums close to internal resonance conditions, supporting the microscopic theory. It reveals that engineered nonlinear dissipation in resonators can be achieved through parametric resonance and internal resonance interactions.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Ceramics
Furkan Turker, Omer R. Caylan, Goknur Buke
Summary: The study found that the morphology of Mo2C crystals varies on a liquid copper surface, and the rate-limiting step for the growth of Mo2C on graphene is the diffusion of Mo to the copper surface.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Heng Wang, Gaurav Jayaswal, Geetanjali Deokar, John Stearns, Pedro M. F. J. Costa, Garret Moddel, Atif Shamim
Summary: This study demonstrates geometric diodes based on CVD-grown monolayer graphene, with experiments showing improved diode parameters when reducing neck widths. The smallest reported neck width for a graphene geometric diode was studied, with results indicating enhanced diode performance characteristics such as nonlinearity and responsivity.
Article
Polymer Science
Sunghun Cho, Jun Seop Lee, Hyeji Jang, Seorin Park, Ji Hyun An, Jyongsik Jang
Summary: The study demonstrates a facile method of controlling the crystalline structures of polyketone films by combining plasma surface treatment with chemical vapor deposition (CVD) technique. The graphene sheets produced by CVD method play a crucial role in promoting the crystallization of beta-form polyketone and suppressing the growth of alpha-form polyketone crystals. Surface functionality of the CVD-grown graphene is found to be a significant factor in determining the crystalline structure of the polyketone.
Article
Nanoscience & Nanotechnology
Junhyung Kim, Geonwoo Lee, Sergey G. Menabde, Yong Jai Cho, Carsten Rockstuhl, Min Seok Jang
Summary: Graphene plasmons have dynamic tunability and extreme field confinement. The temperature effects are significant for graphene-based tunable plasmonic devices operating at low temperatures.
Article
Chemistry, Multidisciplinary
Kishan Thodkar, Milivoj Plodinec, Fabian Gramm, Karsten Kunze
Summary: Quantifying the intrinsic properties of 2D materials is crucial for their applications. This study demonstrates a method for preparing suspended chemical vapor deposition (CVD) graphene films directly on their growth substrates, allowing for the quantification of intrinsic strain and doping. The results show consistent patterns of compressive strain in the films and highlight the importance of studying materials directly on their growth substrates to avoid transfer-induced alterations.
Article
Multidisciplinary Sciences
Ryota Okuda, Kazuhiko Niwano, Kaname Hatada, Kei Kokubu, Ryosuke Suga, Takeshi Watanabe, Shinji Koh
Summary: Graphene was applied to coplanar waveguide transmission lines in this study, and different types of graphene were tested and simulated. The results validated the transmission properties of graphene and provided parameters for improvement.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Mechanical
Mauro Ricotta, Giovanni Meneghetti
Summary: A theoretical model is proposed to estimate the intrinsic dissipation in tension-tension fatigue of metals, based on the second-harmonic temperature signal obtained from Fourier analysis. The model suggests that self-heating due to intrinsic dissipation spreads out into all harmonics of the temperature signal, including that modulated at the same frequency as the applied load, which primarily captures the thermoelastic effect. Furthermore, the model can adapt to estimating the intrinsic dissipation from the second-harmonic temperature even when the command signal generated by the closed-loop digital controller of the fatigue test machine contains high-order harmonics.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Alaa Y. Ali, Natalie P. Holmes, Mohsen Ameri, Krishna Feron, Mahir N. Thameel, Matthew G. Barr, Adam Fahy, John Holdsworth, Warwick Belcher, Paul Dastoor, Xiaojing Zhou
Summary: This study demonstrates the production of graphene thin films with good conductivity and transparency using chemical vapour deposition. The graphene films were successfully used as transparent electrodes in organic photovoltaics, resulting in improved performance of the solar cells.
Article
Chemistry, Multidisciplinary
M. Bahri, B. Shi, K. Djebbi, M. A. Elaguech, D. Zhou, M. Ben Ali, C. Tlili, D. Wang
Summary: Graphene, known for its exceptional electron mobility and thermal conductivity, has been widely used in various applications since the discovery of the mechanical exfoliation method over a decade ago. However, achieving defect-free ultra-clean transfer of graphene remains crucial for the efficiency of large-area graphene devices.
MATERIALS TODAY CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Xiaoqiang Feng, Zhengyi He, Lingyan Yu, Zhiduo Liu, Gang Wang, Siwei Yang, Guqiao Ding
Summary: The study demonstrates the growth of VAGAs on FTO substrates using PECVD technology, enhancing the performance of SERS substrates with improved photoelectric properties and adsorption capacity. The electronic interactions in the VAGA-FTO heterostructure result in hybrid SERS substrates with high sensitivity, reusability, and stability.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Physics, Applied
Brahmanandam Javvaji, Ranran Zhang, Xiaoying Zhuang, Harold S. Park
Summary: Atomistic simulations demonstrate that flexoelectricity can generate electricity from crumpled graphene sheets. By creating localized developable (d)-cones through indentation of circular graphene sheets, it is found that the voltage generated from crumpling graphene exceeds the expected generation by about an order of magnitude.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
Jeong-Ho Lee, Harold S. Park, Douglas P. Holmes
Summary: The study reveals that elastic instabilities play a crucial role in the morphogenesis of the eye during development, especially in the formation of the optic cup. If the optic vesicle is too slender, it may cause buckling and break axisymmetry, thus hindering normal development.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Lucia Stein-Montalvo, Jeong-Ho Lee, Yi Yang, Melanie Landesberg, Harold S. Park, Douglas P. Holmes
Summary: In this study, we demonstrate that by restricting the active area to the shell boundary, the size of the shell can be significantly reduced, resulting in a decrease in energy input required for actuation. Through theoretical simulations and experimental validation, we elucidate the underlying mechanics of snap-through and provide an intuitive route to efficient design.
EUROPEAN PHYSICAL JOURNAL E
(2022)
Review
Computer Science, Interdisciplinary Applications
Wing Kam Liu, Shaofan Li, Harold S. Park
Summary: This article presents a comprehensive historical account of the development of finite element methods, with a specific focus on developments related to solid mechanics. It provides a historical overview starting from the theoretical formulations and origins of the FEM, discussing important developments that have made the FEM the preferred numerical method for solid mechanics problems.
ARCHIVES OF COMPUTATIONAL METHODS IN ENGINEERING
(2022)
Correction
Computer Science, Interdisciplinary Applications
Wing Kam Liu, Shaofan Li, Harold S. Park
ARCHIVES OF COMPUTATIONAL METHODS IN ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
N. Vu-Bac, T. Rabczuk, H. S. Park, X. Fu, X. Zhuang
Summary: In this study, a novel formulation using nonlinear kinematics and material models is proposed to couple elasticity and solvent transport in stimuli-responsive gels. The identification of external stimuli to generate specific target shapes is achieved through an inverse methodology that chemomechanically couples large deformation and mass transport. Numerical examples demonstrate the capability of identifying the required external stimuli and accurately reconstructing target shapes, including those involving elastic instabilities or softening.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Lingxiao Yuan, Harold S. Park, Emma Lejeune
Summary: There has been an increased interest in applying data driven methods to mechanics problems, with a focus on predictive modeling and design of materials. However, traditional machine learning methods can be sensitive to data distribution shifts and violate the assumption of independent and identically distributed data. Out-of-distribution (OOD) generalization methods have been proposed to address this issue, but their performance on regression problems in mechanics is yet to be explored. This study investigates OOD generalization methods for mechanics-specific regression problems and suggests the need for more robust methods that can handle multiple OOD scenarios.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Jong-Hyun Seo, Sung-Gyu Kang, Yigil Cho, Harold S. Park, Youngdong Yoo, Bongsoo Kim, In-Suk Choi, Jae-Pyoung Ahn
Summary: Buckling is a loss of structural stability, particularly in long slender structures or thin plate structures subjected to compressive forces. This study utilizes the buckling instability of Au nanowires for electrical measurement and confirms that high-strength single crystalline Au nanowires can exhibit classical Euler buckling under constant compressive force without failure. The study suggests the use of Au nanowire probes with structural instability for stable and precise electrical measurements at the nanoscale.
Article
Physics, Applied
Li-Kai Wan, Yi-Xuan Xue, Jin-Wu Jiang, Harold S. S. Park
Summary: Lateral heterostructures of graphene/hexagonal boron nitride exhibit unique electronic and optical properties, and the mechanical properties of the interface play a crucial role in their stability. Through molecular dynamics simulations and machine learning, a study on the fracture properties of the interface in these heterostructures was conducted. It was found that the shape of the interface significantly affects the fracture stress and strain, and a machine learning model was able to identify the strongest interfaces. The findings also revealed the importance of interface roughness and chemical bond strength in determining interface strength, and the correlation between fracture properties and thermal conductivity.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Mohamed Shaat, Harold S. Park
Summary: There is significant interest in studying the functionality of odd elastic solids, which are a specific class of active matter that cannot be described by a free energy function. This paper proposes the coupling of non-symmetric elasticity with chiral, nonreciprocal elasticity as a means to achieve isotropic elastic solids exhibiting non-symmetric elasticity.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Jeong-Ho Lee, Harold S. Park, Douglas P. Holmes
Summary: Soft matter mechanics involves finite deformations and instabilities of structures in response to mechanical and non-mechanical stimuli. Modeling plates and shells is challenging due to their nonlinear response to loads, and non-mechanical loads further complicate matters by modifying the shell's energy functional. This work demonstrates a mechanical interpretation of non-mechanical stimuli, transforming their effects into effective external loadings and enabling the use of standard analytical and computational tools. The theory is validated by benchmark problems and applied to examples such as the snapping of the Venus flytrap and leaf growth.
MATHEMATICS AND MECHANICS OF SOLIDS
(2023)
Article
Chemistry, Multidisciplinary
Lijie He, Guangming Cheng, Yong Zhu, Harold S. Park
Summary: We use a hybrid diffusion- and nucleation-based kinetic Monte Carlo model to explain the significant influence of adatom diffusion on incipient surface dislocation nucleation in metal nanowires. We discover a stress-regulated diffusion mechanism that promotes the accumulation of diffusing adatoms near nucleation sites, explaining the experimental observations of temperature-dependent nucleation strength but weak strain-rate dependence. Additionally, our model shows that a decreasing rate of adatom diffusion with increasing strain rate leads to stress-controlled nucleation becoming the dominant mechanism at higher strain rates. Overall, our model provides new mechanistic insights into how surface adatom diffusion directly affects the nucleation process and mechanical properties of metal nanowires.
Article
Engineering, Mechanical
Hai D. Huynh, Xiaoying Zhuang, Harold S. Park, S. S. Nanthakumar, Yabin Jin, Timon Rabczuk
Summary: The Willis coupling, which couples momentum to strain in elastic metamaterials, has been extensively studied for its potential in enabling novel wave propagation phenomena. Recent work has shown that the momentum can also be coupled to electrical stimulus in piezoelectric composites, resulting in a new form of electro-momentum coupling. In this study, a topology optimization approach is presented to maximize the electro-momentum coupling in piezoelectric composites, allowing for the design of composites that support novel wave phenomena excited through non-mechanical means.
EXTREME MECHANICS LETTERS
(2023)
Article
Thermodynamics
Yixuan Xue, Harold S. Park, Jin-Wu Jiang
Summary: In this study, we demonstrate that the interfacial thermal resistance in graphene/fullerene/graphene sandwiches can be switchable and show a step-like change by varying the number of fullerenes. This switchable phenomenon is achieved by a structural transition between the graphene layers. The study also shows that mechanical strain or temperature variation can achieve the same switchable effect. This work highlights the potential application of sandwich-like nanoscale heterostructures in switchable thermal devices.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Materials Science, Multidisciplinary
Yan Lu, Harold S. Park
Summary: A computational methodology is presented for the systematic design of continuous two-dimensional square phononic metamaterials with C-4(v) and C-2(v) symmetry, resulting in the emergence of double Dirac degeneracy and topologically protected interface propagation based on the quantum spin Hall effect. Numerical simulations demonstrate helical edge states at the interface between two topologically distinct square phononic metamaterials, offering the possibility of pseudospin-dependent transport beyond hexagonal lattices.
Article
Chemistry, Multidisciplinary
Laetitia Bardet, Herve Roussel, Stefano Saroglia, Masoud Akbari, David Munoz-Rojas, Carmen Jimenez, Aurore Denneulin, Daniel Bellet
Summary: The thermal instability of silver nanowires leads to increased electrical resistance in AgNW networks. Understanding the relationship between structural and electrical properties of AgNW networks is crucial for their integration as transparent electrodes in flexible optoelectronics. In situ X-ray diffraction measurements were used to study the crystallographic evolution of Ag-specific Bragg peaks during thermal ramping, revealing differences in thermal and structural transitions between bare and SnO2-coated AgNW networks.
Article
Chemistry, Multidisciplinary
Nathalia Cancino-Fuentes, Arnau Manasanch, Joana Covelo, Alex Suarez-Perez, Enrique Fernandez, Stratis Matsoukis, Christoph Guger, Xavi Illa, Anton Guimera-Brunet, Maria V. Sanchez-Vives
Summary: This study provides a comprehensive characterization of graphene-based solution-gated field-effect transistors (gSGFETs) for brain recordings, highlighting their potential clinical applications.
Article
Chemistry, Multidisciplinary
Sikandar Aftab, Hailiang Liu, Dhanasekaran Vikraman, Sajjad Hussain, Jungwon Kang, Abdullah A. Al-Kahtani
Summary: This study examines the effects of hybrid nanoparticles made of NiO@rGO and NiO@CNT on the active layers of polymer solar cells and X-ray photodetectors. The findings show that these hybrid nanoparticles can enhance the charge carrier capacities and exciton dissociation properties of the active layers. Among the tested configurations, the NiO@CNT device demonstrates superior performance in converting sunlight into electricity, and achieves the best sensitivity for X-ray detection.
Article
Chemistry, Multidisciplinary
Hyo Jung Shin, Seung Gyu Choi, Fengrui Qu, Min-Hee Yi, Choong-Hyun Lee, Sang Ryong Kim, Hyeong-Geug Kim, Jaewon Beom, Yoonyoung Yi, Do Kyung Kim, Eun-Hye Joe, Hee-Jung Song, Yonghyun Kim, Dong Woon Kim
Summary: This study investigates the role of SOX9 in reactive astrocytes following ischemic brain damage using a PLGA nanoparticle plasmid delivery system. The results demonstrate that PLGA nanoparticles can reduce ischemia-induced neurological deficits and infarct volume, providing a potential opportunity for stroke treatment.
Article
Chemistry, Multidisciplinary
Anurag Chaudhury, Koushik Debnath, Nikhil R. Jana, Jaydeep K. Basu
Summary: The study investigates the interaction between nanoparticles and cell membranes, and identifies key parameters, including charge, crowding, and membrane fluidity, that determine the adsorbed concentration and unbinding transition of nanoparticles.
Article
Chemistry, Multidisciplinary
Sina Sadeghi, Fazel Bateni, Taekhoon Kim, Dae Yong Son, Jeffrey A. Bennett, Negin Orouji, Venkat S. Punati, Christine Stark, Teagan D. Cerra, Rami Awad, Fernando Delgado-Licona, Jinge Xu, Nikolai Mukhin, Hannah Dickerson, Kristofer G. Reyes, Milad Abolhasani
Summary: In this study, an autonomous approach for the development of lead-free metal halide perovskite nanocrystals is presented, which integrates a modular microfluidic platform with machine learning-assisted synthesis modeling. This approach enables rapid and optimized synthesis of copper-based lead-free nanocrystals.
Article
Chemistry, Multidisciplinary
Zahir Abbas, Nissar Hussain, Surender Kumar, Shaikh M. Mobin
Summary: The rational construction of free-standing and flexible electrodes for electrochemical energy storage devices is an emerging research focus. In this study, a redox-active metal-organic framework (MOF) was prepared on carbon nanofibers using an in situ approach, resulting in a flexible electrode with high redox-active behavior and unique properties such as high flexibility and lightweight. The prepared electrode showed excellent cyclic retention and rate capability in supercapacitor applications. Additionally, it could be used as a freestanding electrode in flexible devices at different bending angles.
Article
Chemistry, Multidisciplinary
Lishan Zhang, Xiaoting Zhang, Hui Ran, Ze Chen, Yicheng Ye, Jiamiao Jiang, Ziwei Hu, Miral Azechi, Fei Peng, Hao Tian, Zhili Xu, Yingfeng Tu
Summary: Photodynamic therapy (PDT) is a promising local treatment modality in cancer therapy, but its therapeutic efficacy is restricted by ineffective delivery of photosensitizers and tumor hypoxia. In this study, a phototactic Chlorella-based near-infrared (NIR) driven green affording-oxygen microrobot system was developed for enhanced PDT. The system exhibited desirable phototaxis and continuous oxygen generation, leading to the inhibition of tumor growth in mice. This study demonstrates the potential of using a light-driven green affording-oxygen microrobot to enhance photodynamic therapy.
Article
Chemistry, Multidisciplinary
Yujin Li, Jing Xu, Xinqi Luo, Futing Wang, Zhong Dong, Ke-Jing Huang, Chengjie Hu, Mengyi Hou, Ren Cai
Summary: In this study, hollow heterostructured materials were constructed using an innovative template-engaged method as cathodes for zinc-ion batteries. The materials exhibited fast Zn2+ transport channels, improved electrical conductivity, and controlled volume expansion during cycling. The designed structure allowed for an admirable reversible capacity and high coulombic efficiency.
Article
Chemistry, Multidisciplinary
Paritosh Mahato, Shashi Shekhar, Rahul Yadav, Saptarshi Mukherjee
Summary: This study comprehensively elucidates the role of the core and electrostatic surface of metal nanoclusters in catalytic reduction reactions. The electrostatic surface dramatically modulates the reactivity of metal nanoclusters.
Article
Chemistry, Multidisciplinary
Pei Liu, Mengdi Liang, Zhengwei Liu, Haiyu Long, Han Cheng, Jiahe Su, Zhongbiao Tan, Xuewen He, Min Sun, Xiangqian Li, Shuai He
Summary: This study demonstrates a simple and environmentally-friendly method for the synthesis of zinc oxide nanozymes (ZnO NZs) using wasted hop extract (WHE). The WHE-ZnO NZs exhibit exceptional peroxidase-like activity and serve as effective catalysts for the oxidation of 3,3,5,5-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide (H2O2). In addition, a straightforward colorimetric technique for detecting both H2O2 and glucose was developed using the WHE-ZnO NZs as peroxidase-like catalysts.
Article
Chemistry, Multidisciplinary
Hyunkyu Oh, Young Jun Lee, Eun Ji Kim, Jinseok Park, Hee-Eun Kim, Hyunsoo Lee, Hyunjoo Lee, Bumjoon J. Kim
Summary: Mesoporous carbon particles have unique structural properties that make them suitable as support materials for catalytic applications. This study investigates the impact of channel nanostructures on the catalytic activity of porous carbon particles (PCPs) by fabricating PCPs with controlled channel exposure on the carbon surface. The results show that PCPs with highly open channel nanostructures exhibit significantly higher catalytic activity compared to those with closed channel nanostructures.
Article
Chemistry, Multidisciplinary
Yunjie Lu, Zhaohui Li, Zewei Li, Shihao Zhou, Ning Zhang, Jianming Zhang, Lu Zong
Summary: A tough, long-lasting adhesive and highly conductive nanocomposite hydrogel (PACPH) was fabricated via the synergy of interfacial entanglement and adhesion group densification. PACPH possesses excellent mechanical properties, interfacial adhesion strength, and conductivity, making it a promising material for long-term monitoring of human activities and electrocardiogram signals.
Article
Chemistry, Multidisciplinary
Zichao Wei, Audrey Vandergriff, Chung-Hao Liu, Maham Liaqat, Mu-Ping Nieh, Yu Lei, Jie He
Summary: We have developed a simple method to prepare polymer-grafted plasmonic metal nanoparticles with pH-responsive surface-enhanced Raman scattering. By using pH-responsive polymers as ligands, the aggregation of nanoparticles can be controlled, leading to enhanced SERS. The pH-responsive polymer-grafted nanoparticles show high reproducibility and sensitivity in solution, providing a novel approach for SERS without the need for sample pre-concentration.
Article
Chemistry, Multidisciplinary
Melis Ozge Alas Colak, Ahmet Gungor, Merve Buldu Akturk, Emre Erdem, Rukan Genc
Summary: This research investigates the effect of functionalizing carbon dots with hydroxyl polymers on their performance as electrode materials in a supercapacitor. The results show that the functionalized carbon dots exhibit excellent electrochemical performance and improved stability.
