Article
Chemistry, Multidisciplinary
Wei Nie, Qianhong Zhu, Yuying Gao, Ziyuan Wang, Yong Liu, Xun Wang, Ruotian Chen, Fengtao Fan, Can Li
Summary: The study reveals locally enhanced electron transfer (ET) current at corner sites on single Au triangular nanoplates due to mass transport effect, showing a 2-fold increase in ET rate constant compared to basal {111} plane. Additionally, the spatial heterogeneity of local inner potential differences at Au nanoplates/solution interfaces is found to play a key role in the ET process.
Article
Chemistry, Analytical
David Klenerman, Yuri Korchev, Pavel Novak, Andrew Shevchuk
Summary: The reduction in ion current near a cell surface when a fine pipette approaches allows imaging of cell surface topography with nanoscale resolution without damaging the delicate surface. By combining various methods such as single-channel recording, force application, and fluorescence imaging, there is great potential to image and map live cell surfaces at the nanoscale with high resolution and speed.
ANNUAL REVIEW OF ANALYTICAL CHEMISTRY, VOL 14, 2021
(2021)
Article
Chemistry, Multidisciplinary
Chi Zhang, Jason M. Bartell, Jonathan C. Karsch, Isaiah Gray, Gregory D. Fuchs
Summary: A time-resolved near-field magnetic microscope based on magnetothermal interactions is developed, providing spatial resolution on the scale of 100 nm and a temporal resolution below 100 ps. This microscope offers an accessible and comparatively low-cost approach for nanoscale spatiotemporal magnetic microscopy in laboratories.
Article
Nanoscience & Nanotechnology
Andrew C. Lang, D. Scott Katzer, Neeraj Nepal, David J. Meyer, Rhonda M. Stroud
Summary: Epitaxial transition metal nitrides (TMNs) are a new class of crystalline thin film metals that can be integrated with common group III-nitride semiconductors. This study used high-resolution transmission electron microscopy to identify different phases of tantalum nitrides with N-sublattice ordering, revealing Ta-deficient films with specific planar defects. These findings lay the foundation for the application of this epitaxial TMN material in new electronic and superconducting device structures.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Junxi Yu, Rajiv Giridharagopal, Yuhao Li, Kaichen Xie, Jiangyu Li, Ting Cao, Xiaodong Xu, David S. Ginger
Summary: By studying graphene with ABAB and ABCA stacking, it was found that the surface potential of ABCA regions is approximately 15 mV higher than that of ABAB regions, due to stacking-dependent electronic structure. The moire superlattice visualized by LPFM can change with time, while imaging the surface potential distribution via SKPM appears more stable for mapping ABAB and ABCA regions.
Review
Chemistry, Physical
Prachi Ghoderao, Sanjay Sahare, Shern-Long Lee, Prashant Sonar
Summary: Scanning probe microscopy (SPM) is a powerful technique that allows for the observation and analysis of nanoscale materials and biological molecules through the use of sharp probes that scan the sample surface. This method, which includes scanning tunneling microscopy (STM) and atomic force microscopy (AFM), provides valuable insights into the properties and behavior of these materials at a molecular level. This review highlights the applications of SPM in biomolecule imaging and the study of physiological processes, as well as the challenges and potential solutions in biological sample preparation. It also discusses the recent advancements in STM and AFM applications on biomolecules, such as DNA, proteins, and carbohydrates, and their potential applications in fields like drug delivery and biosensors.
Review
Chemistry, Physical
Chunlei Yang, Tianhui Su, Yanbo Hua, Liming Zhang
Summary: This review summarizes the latest results of electrochemical scanning probe microscopy techniques in studying the interfacial properties of electrocatalysts and photoelectrodes, and offers some perspectives on future research directions.
Article
Engineering, Biomedical
Yuji Nashimoto, Minori Abe, Ryota Fujii, Noriko Taira, Hiroki Ida, Yasufumi Takahashi, Kosuke Ino, Javier Ramon-Azcon, Hitoshi Shiku
Summary: This study evaluates the role of scanning probe microscopy (SPM) as an analytical tool for microphysiological systems (MPS), providing a new solution for real-time high spatial resolution imaging. A simple vascular model was used for permeability and topographical analysis, paving the way for the application of SPM technology in MPS.
ADVANCED HEALTHCARE MATERIALS
(2021)
Article
Chemistry, Physical
Renato Buzio, Andrea Gerbi, Cristina Bernini, Luca Repetto, Andrea Vanossi
Summary: This study investigates the frictional response of micrometric silica beads sliding on graphite under ambient conditions using colloidal probe atomic force microscopy. The experiment reveals that tribotransferred graphene flakes act as lubricious nanoasperities, reducing the true contact area and governing mechanical dissipation. The load-driven atomic-scale transition from superlubric sliding to stick-slip behavior is consistent with the Prandtl-Tomlinson model.
Article
Cell Biology
Mikhail Petrov, Igor Sokolov
Summary: By introducing machine learning methods for the analysis of adhesion maps, we are able to distinguish precancerous and cancerous cervical cells with good precision, which is significant for improving cervical cancer screening.
Article
Chemistry, Multidisciplinary
Nicolas Neel, Joerg Kroeger
Summary: The study revealed that the formation of a chemical bond between a CO molecule and a Cu(111) surface is accompanied by bending of the molecular probe due to van der Waals attraction and Pauli repulsion, resulting in characteristic changes in the vertical force between CO and Cu(111) as a function of molecule-surface distance. Experimental data were successfully reproduced by model calculations, shedding new light on vertical-force extrema in scanning probe experiments.
Article
Physics, Applied
Tal I. Sommer, Ori Katz
Summary: The ultrasound pixel-reassignment (UPR) technique adapts the pixel-reassignment method from confocal fluorescent microscopy to improve resolution and signal to noise ratio in ultrasound imaging. The theoretical analysis and experimental evaluation demonstrate a 25% resolution improvement and 3 dB SNR improvement in in vitro scans without any hardware or acquisition scheme changes.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Kohei Yamasue, Yasuo Cho
Summary: Scanning nonlinear dielectric microscopy (SNDM) is a near-field microwave-based scanning probe microscopy method that has wide applications. It is often combined with contact-mode atomic force microscopy (AFM) for topography imaging and contact force regulation. However, SNDM with intermittent contact AFM may result in a lower signal-to-noise ratio. To improve this, we propose a boxcar averaging based signal acquisition method and demonstrate its enhancement on SNDM combined with peak-force tapping AFM. The proposed method is also applicable to other scanning near-field microwave microscopes.
Article
Chemistry, Analytical
Pengfei Fan, Jian Gao, Hui Mao, Yanquan Geng, Yongda Yan, Yuzhang Wang, Saurav Goel, Xichun Luo
Summary: This article presents the mechanism, current research, and application characteristics of scanning probe lithography (SPL) nanofabrication technique, and analyzes the effects of thermal, chemical, electric, and magnetic fields on this technology. The article also compares different fabrication capabilities, throughput, and attainable resolution, and points out that SPL has yet to achieve its full commercial potential.
Article
Energy & Fuels
Christian Kameni Boumenou, Amala Elizabeth, Finn Babbe, Alice Debot, Harry Moeenig, Alex Redinger
Summary: The study investigated the buried MoSe2/CuInSe2 interface of stoichiometric absorbers in thin film solar cells, revealing differences in local density of states compared to the front-side properties. This sheds new light on the complex interface formation in CuInSe2-based thin film solar cells grown under Cu-rich conditions.
PROGRESS IN PHOTOVOLTAICS
(2021)
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
Philipp Wagner, Adam Foster, Insook Yi, Masayuki Abe, Yoshiaki Sugimoto, Regina Hoffmann-Vogel
Summary: The study revealed complex behaviors of tip apex distortion during non-contact scanning force microscopy measurements, showing variations in rigidity and atomic composition of the tips on different surfaces. Atomistic simulations and first principles simulations were used for comparison, indicating differences in force minima between different types of terminated tips. Additionally, it was found that tip apex atoms can undergo atomic jumps at room temperature, changing the atomic configuration of the tip apex.
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
Physics, Applied
P. Milde, M. Langenhorst, H. Hoelscher, J. Rottmann-Matthes, D. Hundertmark, L. M. Eng, R. Hoffmann-Vogel
Summary: The fundamental sensitivity limit of atomic force microscopy is closely related to the thermal noise of cantilever oscillation, and reducing measurement bandwidth has limitations. Increasing laser power can induce nonlinear optomechanical effects, enhancing the effective quality factor of the cantilever and leading to out-of-equilibrium noise.
JOURNAL OF APPLIED PHYSICS
(2021)
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
Nanoscience & Nanotechnology
Julia Hauser, Daniel Rothhardt, Robert Pfender-Siedle, Regina Hoffmann-Vogel
Summary: This study highlights the importance of electromigration in interconnects and demonstrates the observation of quantum size and shell effects in Cu nanocontacts, even in the presence of oxidation.
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
Physics, Condensed Matter
Michael Marz, Andrew Issac, Veronika Fritsch, Amina Kimouche, Regina Hoffmann-Vogel
Summary: C-60 is a model system used to study molecule-surface interactions and phase transitions. It exhibits high symmetry and strong covalent and pi bonding within the molecule, while weak van-der-Waals coupling is present between neighboring molecules. The orientation of C-60 represents classic spins and serves as a model for disordered spin systems with frustration. Scanning tunneling microscopy reveals the rotational structure of C-60 islands on graphite, showing a combination of rotationally ordered and disordered layers. The weak interactions between neighboring molecules are confirmed by scanning tunneling spectroscopy data.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Chemistry, Physical
Sebastian Schneider, Kushtrim Bytyqi, Stephan Kohaut, Patrick Buegel, Benjamin Weinschenk, Michael Marz, Amina Kimouche, Karin Fink, Regina Hoffmann-Vogel
Summary: The self-assembly behavior of DBBA molecules on Au(111) was investigated using FM-SFM and ab initio calculations. It was found that the assembly morphology of the molecules changes with increasing coverage, and different phases coexist at intermediate coverage. Additionally, the adsorption behavior and interactions of the molecules were discussed and compared with the results from ab initio calculations.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
