Article
Chemistry, Multidisciplinary
Paul Burger, Gyanendra Singh, Christer Johansson, Carlos Moya, Gilles Bruylants, Gerhard Jakob, Alexei Kalaboukhov
Summary: Magnetic nanoparticles (MNPs) are important for fabrication of tailored nanomagnetic structures. In this study, precise and controllable manipulation of individual magnetite MNPs using atomic force microscope was demonstrated. Placing MNPs on a two-dimensional electron gas and observing hysteresis loop verified the approach. Additionally, the effective coercivity of the hysteresis loop could be changed by altering the cooling field angle, which is related to the alignment of magnetic moment along the easy axis in magnetite.
Article
Chemistry, Multidisciplinary
Shantanu Mishra, Shadi Fatayer, Saleta Fernandez, Katharina Kaiser, Diego Pena, Leo Gross
Summary: We report the on-surface synthesis of a non-benzenoid triradical through dehydrogenation of truxene (C27H18) on coinage metal and insulator surfaces. The final product truxene-5,10,15-triyl (1) retains its open-shell quartet ground state on a two monolayer-thick NaCl layer on a Cu(111) surface, and its frontier orbital densities correspond to spin-split singly occupied molecular orbitals.
Article
Materials Science, Multidisciplinary
Patricia Haremski, Lars Epple, Matthias Wieler, Piero Lupetin, Leonid Klinger, Eugen Rabkin, Michael J. Hoffmann
Summary: This study investigates surface self-diffusion in nickel bicrystals through experiments and numerical simulations. The results indicate that surface diffusion is the dominant mechanism of grain boundary grooving and the anisotropy of surface diffusion coefficients is determined accurately.
Article
Cell Biology
Elma Sakinatus Sajidah, Keesiang Lim, Tomoyoshi Yamano, Goro Nishide, Yujia Qiu, Takeshi Yoshida, Hanbo Wang, Akiko Kobayashi, Masaharu Hazawa, Firli R. P. Dewi, Rikinari Hanayama, Toshio Ando, Richard W. Wong
Summary: Small extracellular vesicles (sEVs) play a crucial role in cell communication and can be used for drug delivery and structural characterization of nanoparticles. The high-speed atomic force microscopy (HS-AFM) can evaluate the structural changes of sEVs under different physicochemical stresses.
JOURNAL OF EXTRACELLULAR VESICLES
(2022)
Article
Nanoscience & Nanotechnology
Shidong Li, Anqi Sng, Dan Daniel, Hon Chung Lau, Ole Torsaeter, Ludger P. Stubbs
Summary: Silica nanoparticles or nanofluids can alter the wettability of surfaces, making them hydrophilic and oil-repellent under water. The adsorption of nanoparticles onto surfaces forms a porous layer that reduces contact between oil droplets and solid substrates, thereby significantly lowering the adhesion force.Experimental findings suggest that even a small addition of nanoparticles can improve oil recovery rates in micro-models with glass channels resembling physical rock networks.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Jing Chang, Bo Liu, James S. Grundy, Huaizhi Shao, Rogerio Manica, Zhen Li, Qingxia Liu, Zhenghe Xu
Summary: In this study, atomic force microscopy was used to image the surface lattice structure of kaolinite basal planes in liquids, revealing distinct ion adsorption characteristics in the presence and absence of monovalent and divalent cations through different mechanisms.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Materials Science, Paper & Wood
Claudia Gusenbauer, Karolina Peter, Etienne Cabane, Johannes Konnerth
Summary: Chemical force microscopy allows visualization of chemical nano-properties of materials and analysis of their surface behavior, making it valuable for studying natural substrates like wood. By studying adhesion forces and pK(a) values, this method provides insights into the complex chemical surface properties of materials.
Article
Biochemistry & Molecular Biology
Fanny Buchau, Franziska Vielmuth, Jens Waschke, Thomas M. Magin
Summary: Desmosomes are intercellular junctions that mediate cohesion and communication in tissues exposed to mechanical strain. The expression of K17 prevents the formation of stable, hyperadhesive desmosomes, while overexpression of Dsg3 or DPII enhances the formation of hyperadhesive desmosomes.
CELLULAR AND MOLECULAR LIFE SCIENCES
(2022)
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
Shinichiro Ido, Kei Kobayashi, Noriaki Oyabu, Yoshiki Hirata, Kazumi Matsushige, Hirofumi Yamada
Summary: Water structuring on the outer surface of protein molecules, known as the hydration shell, is crucial for the biological activities of protein molecules in vivo. The three-dimensional force mapping technique has been successfully used to investigate the molecular-scale hydration structure of native purple membrane patches.
Article
Physics, Multidisciplinary
D. Stryukov, A. Pavlenko, Ya Yu Matyash, A. Nazarenko
Summary: High quality Ba2NdFeNb4O15 epitaxial films with thicknesses ranging from 10 nm to 1 μm have been successfully fabricated by RF cathode sputtering. The films exhibit orientational domains with a 18.4-degree in-plane rotation and tetragonal unit cell. The surface of the films is smooth and the presence of orientational domains does not affect the surface relief. X-ray diffraction, atomic force microscopy and energy dispersive elemental analysis confirm the absence of impurities in the obtained films.
Article
Engineering, Electrical & Electronic
Ryota Fukuzawa, Daichi Kobayashi, Takuji Takahashi
Summary: Electrostatic force microscopy (EFM) is used to examine the electrostatic force between an AFM tip and sample surface, allowing evaluation of their capacitance and surface potential. The dependences of the electrostatic force on dc voltage and ac voltage frequency can be used to investigate carrier density, carrier type, and deep-level states in a semiconductor. Proper distance control is necessary in EFM to ensure accurate measurements, and the oscillation amplitude of a cantilever can be effectively used for feedback control. The 1 A-mode operation in EFM shows good robustness against the strong electrostatic force and allows proper measurements of tip-sample capacitance.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
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
Materials Science, Ceramics
Ana Violeta Filip, Alexandra Maria Isabel Trefilov, Lucica Boroica, Marius Catalin Dinca, Mihail Elisa, Ileana Cristina Vasiliu, Nicolae Tigau, Simona Brajnicov, Marius Dumitru, Catalin Luculescu, Oana Gherasim Fufa, Bogdan Alexandru Sava
Summary: Boro-phosphate glass-graphene oxide nanocomposites combine nanocarbon electrical properties with the optical and host properties of glass, making them potential candidates for optoelectronic, photonic materials, and bio-applications.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Physics, Condensed Matter
P. Pranav Pradeep, P. C. Shyni, Vishnu Gopal, Shwetha G. Bhat, P. S. Anil Kumar
Summary: This study provides a comprehensive investigation of influential parameters on the surface termination of LSAT (001), and identifies annealing parameter optimizations that directly affect the size and density of SrO mounds. The study also demonstrates the potential of lanthanum vapor in reducing the formation of these mounds.
PHYSICA B-CONDENSED MATTER
(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.