Article
Engineering, Electrical & Electronic
Quanwei Zhang, Cun Li, Yulong Zhao, Zichao Zhang
Summary: The quartz resonant pressure sensor designed has high precision and stability, with high sensitivity and accuracy under ultra-high pressure, suitable for special fields such as deep-sea exploration.
IEEE SENSORS JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Saumil Desai, Ankur Pandya, Vipul Bhojawala, Prafulla K. Jha
Summary: The theoretical proposal of a graphene nanoribbon (GNR) based nanoelectromechanical resonator (NEMR) is presented, considering its vibrational characteristics and the effect of different dopants (F, Li, and K) on the device. The calculated results show that the proposed device has a Q-factor in the range of 10^2-10^4 and a force sensitivity of 5.8-29.5 aN/ root Hz (Li-doped), 7.09-36.42 aN/ root Hz (F-doped), and 6.21-31.87 aN/ root Hz (K-doped) for the temperature range of 200 K-300 K. This study is significant for nanoscale electromechanical applications and graphene-based pressure sensor design.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Chemistry, Physical
Tiantian Wang, Yuxiao Zou, Yurong Shi, Xin Wang, Fang Wang, Guofeng Song, Weihai Fang, Ying Liu
Summary: By studying the magnetic and non-magnetic defects on the surface of graphene, it was found that magnetic defects can produce strong quasi-particle quantum interference patterns, and structural transformations between magnetic and non-magnetic defects were observed during the experiment.
APPLIED SURFACE SCIENCE
(2022)
Article
Cell Biology
Eleni Priglinger, Juergen Strasser, Boris Buchroithner, Florian Weber, Susanne Wolbank, Daniela Auer, Eva Grasmann, Claudia Arzt, Dmitry Sivun, Johannes Grillari, Jaroslaw Jacak, Johannes Preiner, Mario Gimona
Summary: Interest in using mesenchymal stem cell derived extracellular vesicles (MSC-EVs) as therapeutic agents has grown in the past decade. This study established and verified quartz crystal microbalance (QCM) as a highly sensitive label-free immunosensing technique for characterizing clinically approved umbilical cord MSC-EVs. By using QCM along with common characterization methods, specific detection of EVs via EV and MSC markers was achieved, allowing for quantitative determination of the ratio of marker-specific EVs versus non-vesicular particles.
JOURNAL OF EXTRACELLULAR VESICLES
(2021)
Article
Chemistry, Physical
Xinran Zhang, Jiangang Guo, Weigao Zhao
Summary: The adhesion force between a single phenyl ring and monolayer graphene was measured and calculated through experimental and theoretical methods. The single-bond force played a key role in the desorption process and can be divided into two stages.
APPLIED SURFACE SCIENCE
(2021)
Article
Physics, Applied
J. Smulko, K. Drozdowska, A. Rehman, T. Welearegay, L. Osterlund, S. Rumyantsev, G. Cywinski, B. Stonio, A. Krajewska, M. Filipiak, P. Sai
Summary: We investigated the electrical properties and noise characteristics of Au nanoparticle-decorated graphene-Si Schottky barrier diodes. By introducing organic vapors or yellow light illumination, we observed shifts in the DC characteristics and differences in low-frequency noise, suggesting the potential for utilizing flicker noise for gas detection in these devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Polymer Science
Dane Hintermueller, Ravi Prakash
Summary: Pristine and doped PVDF materials are widely used in pressure sensing and energy harvesting. This study presents an optimal procedure to prepare high-quality PVDF films and verifies their electromechanical properties. A novel stationary AFM technique is also introduced for extracting the piezoelectric coefficients of PVDF films.
Article
Multidisciplinary Sciences
Yink Loong Len, Tuvia Gefen, Alex Retzker, Jan Kolodynski
Summary: The impact of measurement imperfections on quantum metrology protocols has been investigated in this study. By generalizing the concept of quantum Fisher information, the authors propose tractable methods to evaluate its approximate value. The findings show that the control operations play a crucial role in counterbalancing the measurement imperfections and achieving optimal sensitivity.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Thomas Hofmann, Xinguo Ren, Alfred J. Weymouth, Daniel Meuer, Alexander Liebig, Andrea Donarini, Franz J. Giessibl
Summary: This study presents a method for the transition from graphite to diamond on the atomic scale and reveals the local rehybridization of the structure during this transition. The experimental observation of harmonics at specific thresholds and force reduction provides evidence for the existence of this transition.
NEW JOURNAL OF PHYSICS
(2022)
Article
Chemistry, Physical
Umit Celik, Kuebra Celik, Ihsan Kehribar, Suleyman Celik, Mehmet Z. Baykara
Summary: Forming a fundamental understanding of tribological processes on the atomic scale has the potential to revolutionize the control of friction and wear in macroscopic mechanical systems. However, current methods for studying tribology at the nanoscale, such as atomic force microscopy, are limited in scanning speed compared to macroscopic mechanical processes. In this study, a new method combining atomic force microscopy with quartz crystal microbalance measurements is proposed for high-speed nanoscale tribology.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Chemical
Zhiping Shi, Bin Ran, Liyan Liu
Summary: This study determines the interaction energy of fine particles at different pH levels and provides a framework for improving the solid-liquid separation performance of clay-rich tailings.
Article
Chemistry, Physical
Chen Xiao, Liang Peng, Cyrian Leriche, Feng-Chun Hsia, Bart Weber, Steve Franklin
Summary: In this work, the interfacial capillary adhesion and its influence on the friction response of rough polycrystalline diamond (PCD) surfaces were quantified. It was found that the increased friction force on electrochemically-corroded PCD surfaces was mainly attributed to the enhanced capillary adhesion at the contact interface due to increased surface hydrophilicity and environmental humidity.
Article
Chemistry, Multidisciplinary
Simon A. Svatek, Valentina Sacchetti, Laura Rodriguez-Perez, Beatriz M. Illescas, Laura Rincon-Garcia, Gabino Rubio-Bollinger, M. Teresa Gonzalez, Steven Bailey, Colin J. Lambert, Nazario Martin, Nicolas Agrait
Summary: The thermoelectric properties of molecular junctions consisting of [60]fullerene derivatives covalently bound to a graphene electrode were studied using a conducting-probe atomic force microscope (c-AFM). The [60]fullerene derivatives were linked to the graphene electrode through different phenyl ring configurations. The results showed that the magnitude of the Seebeck coefficient was up to nine times larger than that of Au-C60-Pt molecular junctions, and the thermopower sign depended on the binding geometry and Fermi energy.
Article
Materials Science, Multidisciplinary
Jiadong Shi, Guozheng Ma, Guolu Li, Qingsong Yong, Weiling Guo, Zhiguo Xing, Haidou Wang
Summary: The uniform coating of graphene on the DLC surface is achieved through argon protection and low-temperature heating. The generation of graphene nanoscrolls is induced by high-contact stress and frictional heat. The Graphene/DLC coatings exhibit a stable low friction coefficient in atmospheric and vacuum environments.
Article
Automation & Control Systems
Kangwagye Samuel, Roberto Oboe, Sehoon Oh
Summary: This article introduces a reduced-order multisensor-based force observer for accurately estimating the force exerted on a load, which excels in noise attenuation and offset compensation. The observer design includes tools for analysis and evaluation of its performance.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Alfred John Weymouth, Elisabeth Riegel, Bianca Simmet, Oliver Gretz, Franz J. Giessibl
Summary: The research shows that on the surfaces of Cu(111) and Ag(111), even without inelastic events, the presence of the tip can induce rotations of CuPc molecules, and closer approach results in the rotated states being favored. Additionally, the long-range attraction of the tip can change the potential energy landscape of the CuPc molecular switch, and the geometry of the rotated and ground states of CuPc differs on Cu(111) and Ag(111).
Article
Instruments & Instrumentation
Dominik Kirpal, Jinglan Qiu, Korbinian Puerckhauer, Alfred J. Weymouth, Michael Metz, Franz J. Giessibl
Summary: This study demonstrates the use of a qPlus sensor in atomic force microscopy to achieve atomic resolution in various environments, and shows how any qPlus AFM setup can be modified to work as a biaxial sensor for simultaneous measurement of lateral and vertical force components.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Multidisciplinary Sciences
Fabian Stilp, Andreas Bereczuk, Julian Berwanger, Nadine Mundigl, Klaus Richter, Franz J. Giessibl
Summary: This study utilized an atomic force microscope to investigate the bonding properties of a quantum corral, finding that confined electrons in the corral showed covalent attraction to metal tips and Pauli repulsion to CO-terminated tips. Repulsion at close distances and appropriately scaled forces with corral size were observed.
Article
Biochemistry & Molecular Biology
Franz J. Giessibl
Summary: The nature of the chemical bond is crucial in various natural sciences, and the AFM technology allows for the study of individual chemical bonds. Experimental AFM data covers a range of chemical bonds, while density functional theory calculations are related to these studies. Frequency modulation AFM is a precise method that has enabled high precision measurements of bonding strengths.
Article
Nanoscience & Nanotechnology
Oliver Gretz, Alfred J. Weymouth, Thomas Holzmann, Korbinian Purckhauer, Franz J. Giessibl
Summary: In lateral force microscopy, utilizing the scanning tunneling microscopy channel for acquiring amplitude and tilt data provides a more accurate and reliable method.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2021)
Review
Physics, Applied
Alfred J. Weymouth, Oliver Gretz, Elisabeth Riegel, Franz J. Giessibl
Summary: In this study, we used lateral force microscopy to investigate the energy dissipation in sliding friction. We found that the CO molecule on the tip bends in different directions as it oscillates over pairs of atoms, leading to energy dissipation. Surprisingly, friction was observed only within a specific range of tip heights, indicating the sensitivity of friction to the local potential energy landscape.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Multidisciplinary
Thomas Hofmann, Xinguo Ren, Alfred J. Weymouth, Daniel Meuer, Alexander Liebig, Andrea Donarini, Franz J. Giessibl
Summary: This study presents a method for the transition from graphite to diamond on the atomic scale and reveals the local rehybridization of the structure during this transition. The experimental observation of harmonics at specific thresholds and force reduction provides evidence for the existence of this transition.
NEW JOURNAL OF PHYSICS
(2022)
Article
Chemistry, Physical
Alexander Liebig, Christoph Setescak, Adrian Weindl, Franz J. Giessibl
Summary: This study utilizes high-resolution atomic force microscopy to observe and analyze surface defects in Bi2Se3. The researchers find that all Se vacancies have a positive polarity, confirming them as electron donors. This work provides a new method for accurately determining the physical properties of defects in topological insulators.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Nanoscience & Nanotechnology
Alfred J. Weymouth, Emily Roche, Franz J. Giessibl
Summary: This study investigates the effect of an electron donor on the electronic state by studying mixed islands of PTCDA and CuPc. The results show that the 2DEG state disappears and new states emerge under submonolayer coverage.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2022)
Article
Chemistry, Physical
Andrea Auer, Bernhard Eder, Franz J. Giessibl
Summary: This paper presents a combined AFM/STM instrument realized with a qPlus sensor and a home-built potentiostat for electrochemical applications. It demonstrates the potential of the instrument by simultaneously imaging graphite with atomic resolution in acidic electrolytes and precisely measuring the interfacial solvent layering as a function of the applied potential.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Theresa Seeholzer, Daniela Tarau, Lea Hollendonner, Andrea Auer, Reinhard Rachel, Dina Grohmann, Franz J. Giessibl, Alfred J. Weymouth
Summary: Researchers compared the S-layer proteins extracted from the archaeon Pyrobaculum aerophilium using atomic force microscopy (AFM) in liquid and ambient conditions with transmission electron microscopy (TEM) images under vacuum conditions. Improved AFM scanning and sample preparation methods allowed the observation of the crystalline structure of the S-layer samples.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Physics, Multidisciplinary
Norio Okabayashi, Thomas Frederiksen, Alexander Liebig, Franz J. Giessibl
Summary: This study reveals the complete manipulation process of a CO molecule on a Cu(110) surface using a combination of noncontact atomic force microscopy and density functional theory simulations. An intermediate state crucial for understanding dynamic friction is found in the reaction pathway during manipulation.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Norio Okabayashi, Thomas Frederiksen, Alexander Liebig, Franz J. Giessibl
Summary: Friction, a complex phenomenon, is studied by simplifying the system through molecular manipulation. In this paper, the authors use noncontact atomic force microscopy, inelastic electron tunneling spectroscopy, and density functional theory calculations to investigate the molecular manipulation process of a single CO molecule on Cu(110) and Cu(111) surfaces. They discover the presence of an important adsorption site that plays a role in the manipulation process and contributes to understanding the dynamics of manipulation and dynamic friction.
Article
Chemistry, Physical
Alexander Liebig, Christoph Setescak, Adrian Weindl, Franz J. Giessibl
Summary: Topological insulators are a type of materials that exhibit semiconducting or insulating properties in their bulk form but possess topologically protected gapless states at their boundaries. This study used high-resolution atomic force microscopy to observe and determine the polarity of surface defects in Bi2Se3. The findings showed that all Se vacancies are electron donors, providing valuable information for accurately determining the physical properties of defects in topological insulators.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Alfred J. Weymouth, Mats Persson, Franz J. Giessibl
Summary: This study investigates the growth and structure of a thin insulating layer on Pt(111) by growing monolayer islands of NaCl and using scanning tunneling microscopy (STM) and atomic force microscopy (AFM). The STM images show a square lattice of Cl anions, while the AFM images only resolve approximately two-thirds of the Cl ions. Density functional theory (DFT) calculations reveal the bimodal distribution of the adsorption heights of the Cl anions above the surface, which can explain the AFM observations.