Article
Chemistry, Physical
Philip Harder, Andreas Nielsen, Ann-Katrin Sassnau, Dennis Bonatz, Markus Perbandt, Tobias Kipp, Alf Mews
Summary: The study investigates the structural properties of CdS, CdSe, and CdTe semiconductor nanowires grown by the SLS method through a detailed experimental and simulation approach. The different samples show varying fractions of Wurtzite and Zincblende, as determined by high-resolution TEM and p-XRD analysis of selected wires and a large amount of NWs.
CHEMISTRY OF MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Noori S. Anad, Zakaria M. Abd El-Fattah, M. Attallah, Hanaa M. Ahmed, M. M. El-Okr, H. H. El-Bahnasawy
Summary: Pristine and chromium-doped ZnO nanowires were synthesized using the co-precipitation method, and their properties were characterized using various techniques. The study showed that chromium doping had minimal effect on the optical band gap, and the successful doping was confirmed through spectroscopic analysis.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Duyen Thi Nguyen, Seohyun Mun, HyunBum Park, Uidon Jeong, Geun-ho Kim, Seongsil Lee, Chung-Sam Jun, Myung Mo Sung, Doory Kim
Summary: The increase in the number and complexity of process levels in semiconductor production has driven the need for new measurement methods that can evaluate fine patterns and simultaneously detect nanoscale contaminants or defects. This study successfully imaged semiconductor nanostructures as small as 30 nm and detected individual 20 nm-diameter contaminants using the STORM technique. The study demonstrates the potential of STORM for nanoscale metrology and defect inspection in semiconductor integrated circuits.
Article
Optics
Maoji Wang, Lauren R. Richey-Simonsen, Jordan M. Gerton
Summary: To investigate the optical modes in nanophotonic devices, researchers demonstrated a probe-free, far-field method to characterize the optical modes within GaN nanowires, observing spectral signatures resulting from lateral leakage of waveguide modes. By using an analytical model coupled with finite element simulations, they were able to accurately deduce the transverse dimension of the nanowires from hyperspectral images.
Article
Materials Science, Multidisciplinary
Rabeea D. Abdel-Rahim, Adham M. Nagiub, Osman A. Pharghaly, Mahmoud A. Taher, El Sayed Yousef, Essam R. Shaaban
Summary: The study investigated the advanced optical properties of silver nanowires (AgNWs) synthesized by the polyol method, exploring the relationship between diameter and optical properties, with decreasing energy gap values as diameter increased. It was found that dielectric values were higher for thin film samples compared to suspension samples, making them suitable for manufacturing optoelectronic and sensing devices.
Review
Engineering, Electrical & Electronic
Stephen A. Church, Ruqaiya Al-Abri, Patrick Parkinson, Dhruv Saxena
Summary: This review focuses on the common techniques and analytical approaches used in the study of semiconductor nanowire lasers. Potential pitfalls in their application are outlined, and best practices and experimental methods for characterizing the material, cavity, and lasing performance of nanowires are discussed. The aim is to advance the understanding and application of nanowires in fields such as biology, photonics, and telecommunications.
PROGRESS IN QUANTUM ELECTRONICS
(2022)
Article
Nanoscience & Nanotechnology
Lily Yang, Stephan Steinhauer, Elia Strambini, Thomas Lettner, Lucas Schweickert, Marijn A. M. Versteegh, Valentina Zannier, Lucia Sorba, Dmitry Solenov, Francesco Giazotto
Summary: Our study investigates the effects of optical-frequency light on InAs/Al Josephson junctions based on highly n-doped InAs nanowires, finding that the junctions are surprisingly robust and only interact with incident radiation through heating. It is suggested that these junctions can be used for optical-frequency photon detection by measuring a shift in critical current.
Article
Optics
Misha Sumetsky, Victor Vassiliev
Summary: We have demonstrated the precise fabrication of surface nanoscale axial photonics bottle microresonators using a flame. We have observed strong non-scalable behavior of the cutoff wavelengths of the whispering gallery mode with different radial quantum numbers along the length of the fiber.
LASER PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Je Myoung Park, Sol Lee, Woongki Na, Kwanpyo Kim, Hyeonsik Cheong
Summary: ReS2 crystals exhibit low symmetry and in-plane anisotropy, with inequivalent vertical orientations but parallel Re-chain directions. Optical measurements reveal optical contrast between the two types of domains, and polarized optical microscopy enables a quick determination of the crystallographic orientations of the domains.
Article
Computer Science, Information Systems
Yue Zhang, Chengtao Peng, Liying Peng, Yingying Xu, Lanfen Lin, Ruofeng Tong, Zhiyi Peng, Xiongwei Mao, Hongjie Hu, Yen-Wei Chen, Jingsong Li
Summary: This paper presents an interactive liver tumor segmentation method based on deep learning, which incorporates user-provided marks to improve the segmentation results. The method predicts tumor boundaries using a three-step framework, and utilizes contextual and boundary information to enhance the accuracy. The proposed approach outperforms the state-of-the-art interactive segmentation methods and produces promising segmentation results.
IEEE JOURNAL OF BIOMEDICAL AND HEALTH INFORMATICS
(2022)
Article
Engineering, Aerospace
Stefan Marz, Anja Schlicht, Urs Hugentobler
Summary: This study simulates and analyzes the impact of geosynchronous orbit (GSO) satellites in Global Navigation Satellite Systems (GNSS). The integration of GSO satellites into a Medium Earth Orbit (MEO) satellite constellation, such as the Galileo satellite constellation, significantly improves the MEO satellite orbits and enables precise determination of GSO satellite orbits. The use of optical links, including Optical Inter-Satellite Links (OISL) and Optical Two-Way Links (OTWL), together with GNSS microwave observations greatly enhances the precision of orbit determination.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Thomas Kanne, Dags Olsteins, Mikelis Marnauza, Alexandros Vekris, Juan Carlos Estrada Saldana, Sara Loric, Rasmus D. Schlosser, Daniel Ross, Szabolcs Csonka, Kasper Grove-Rasmussen, Jesper Nygard
Summary: The core platform of several recent quantum device proposals relies on parallel 1D semiconductor channels connected by a superconducting strip, utilizing Andreev processes or topological effects. A strategy for synthesizing double InAs nanowires using III-V molecular beam epitaxy is presented, allowing for the deposition of a superconducting layer onto nanowires without breaking the vacuum in order to ensure pristine interfaces between the superconductor and the semiconductor nanowires. The method demonstrates the utility of high yield merged or separate parallel nanowires with full or half-shell superconductor coatings in complex quantum devices through electron transport measurements.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Andres Gomez, Jose Manuel Vila-Fungueirino, Claire Jolly, Ricardo Garcia-Bermejo, Judith Oro-Sole, Etienne Ferain, Narcis Mestres, Cesar Magen, Jaume Gazquez, Juan Rodriguez-Carvajal, Adrian Carretero-Genevrier
Summary: This study focuses on the chemical synthesis of a novel SMO hollandite-type manganese oxide nanowire thin film on silicon, revealing its unique crystal structure and ferroelectric and piezoelectric properties. The material shows excellent deformability and high interface recombination, indicating the possibility of engineering the integration of ferroelectric oxides on silicon.
Article
Chemistry, Multidisciplinary
Aaron Gerwien, Frederik Gnannt, Peter Mayer, Henry Dube
Summary: This paper presents a light-fuelled molecular gearing system that allows for precise control and direction change of motion. Compared to passive thermally activated gears, this system demonstrates superior efficiency and flexibility, offering potential for future mechanical nano-systems.
Article
Chemistry, Multidisciplinary
Aaron Gerwien, Frederik Gnannt, Peter Mayer, Henry Dube
Summary: This article presents a light-fuelled molecular gearing system that enables precise motion transmission and direction change, providing an important technological foundation for future mechanical nano-systems.
Article
Chemistry, Multidisciplinary
Heike Lisa Kerstin Stephanie Stolle, Andrea Csaki, Jan Dellith, Wolfgang Fritzsche
Summary: In this study, two methods for modifying gold nanospheres by depositing palladium were investigated, including reduction with ascorbic acid and light-induced metal deposition utilizing the plasmonic effect. Both methods were found effective in depositing Pd on the surface of gold nanoparticles, with the light-assisted method resulting in thinner Pd layers compared to the reduction method with ascorbic acid. The plasmonic effect and hot electron play significant roles in Pd acetate reduction on the gold particle surface.
Article
Chemistry, Multidisciplinary
Ekaterina Podlesnaia, Andrea Csaki, Wolfgang Fritzsche
Summary: This study successfully determined the necessary reaction time for each step of synthesizing shape-anisotropic plasmonic nanoparticles like gold nanotriangles by replicating a seed-mediated synthesis method with high reproducibility. Real-time investigations elucidated the kinetics of the individual stages, leading to the optimization of the complete synthesis, reducing the synthesis time from three days to one without any loss in sample quality.
Article
Physics, Multidisciplinary
A. Alidoust Ghatar, D. Jahani, W. Fritzsche, F. Garwe
Summary: In this study, visible surface plasmon resonances were excited in one-dimensional photonic crystals coated with a graphene layer under the Kretschmann configuration. By numerically studying the plasmonic Bloch wave properties beyond Dirac points, it was found that emergent plasmonic dips in the reflectance spectra showed tunable characteristics upon modulation of the chemical potential and the hopping parameter in the suggested photonic sensing structure. The sensitivity of the sensor in the visible domain was evaluated numerically and compared with that of sensors utilizing surface plasmon resonances in the terahertz regime.
Article
Chemistry, Analytical
Joanna Kosman, Krzysztof Zukowski, Andrea Csaki, Wolfgang Fritzsche, Bernard Juskowiak
Summary: In this study, we investigated the effect of a DNA oligonucleotide sequence on the activity of a DNAzyme with covalently attached hemin. We developed a sandwich assay for detecting DNA sequences using the DNAzyme, which proved to be selective and versatile.
Article
Multidisciplinary Sciences
Stephan Kastner, Pia Pritzke, Andrea Csaki, Wolfgang Fritzsche
Summary: The immobilization chemistry choice in gold nanoparticle LSPR-based bioanalytics can influence the sensitivity of the analysis. Experimental results showed that the LSPR shift triggered by the binding event decreases with increasing distance to the gold surface.
SCIENTIFIC REPORTS
(2022)
Article
Spectroscopy
Faten Farouk, Shereen Essam, Amany Abdel-Motaleb, Rana El-Shimy, Wolfgang Fritzsche, Hassan Mohamed El-Said Azzaz
Summary: A comprehensive assay utilizing FTIR and spectral classification algorithm was developed for fast and accurate detection of bacterial contamination in fresh produce. The procedure involved sample soaking, magnetic nanoparticles capturing, and FTIR scanning, followed by comparison with a bacterial species database. The developed method demonstrated excellent accuracy in detecting bacterial contamination in market samples.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Nanoscience & Nanotechnology
Kirill Gubanov, Manuel Johnson, Melda Akay, Benedikt C. C. Wolz, Dan Shen, Xing Cheng, Silke Christiansen, Rainer H. H. Fink
Summary: Advances in organic materials manufacturing have enabled the creation of electronic devices using solution-processing techniques. This study demonstrates the use of micro-contact for high-quality structured electrodes in top-contact organic field-effect transistors (OFETs) by depositing poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) polymer ink. The optimized solution-processing fabrication of OFETs shows promising potential for simple and cost-effective roll-to-roll manufacturing processes, with comparable electrical performance to transistors with gold electrodes and lower contact resistance (R-c) due to carbon-based organic electrodes.
ADVANCED ELECTRONIC MATERIALS
(2023)
Review
Electrochemistry
Yahia A. A. Yahia, Mohamed W. W. Tawfik, Wolfgang Fritzsche, Hassan M. E. Azzazy
Summary: This review classifies interleukin electrochemical biosensors developed since 2015 into noble metals, ceramics, and carbon-based materials based on the material of the working electrode. The advantages and limitations of each material are discussed and compared, including hybrid ones. Additionally, the designs and performance criteria of these biosensors are compared.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Stephan Kastner, Anne-Kathrin Dietel, Florian Seier, Shaunak Ghosh, Daniel Weiss, Oliwia Makarewicz, Andrea Csaki, Wolfgang Fritzsche
Summary: The need for rapid, simple, and accurate bioassays for nucleic acid detection has increased in recent years. This study utilized localized surface plasmon resonance (LSPR) spectroscopy to detect the antimicrobial resistance gene, sulfhydryl variable beta-lactamase (blaSHV), which confers resistance against a broad spectrum of beta-lactam antibiotics. The system was able to detect a 23 nucleotide DNA sequence at a limit of 25 nm, with signal intensity inversely correlated to sequence length. It was also capable of real-time monitoring and distinguishing single nucleotide polymorphism (SNP) variants of blaSHV.
Article
Materials Science, Multidisciplinary
Lamborghini Sotelo, Tommaso Fontanot, Sanjana Vig, Patrick Herre, Peyman Yousefi, Maria Helena Fernandes, George Sarau, Gerd Leuchs, Silke Christiansen
Summary: This study investigates the effect of the initial surface roughness of TiAl6V4 samples on laser-induced periodic surface structures (LIPSS), surface wettability, and chemistry. Different polishing grain sizes were used to adjust the surface roughness of the samples. Laser irradiation was performed with varying laser power and distance. The resulting structures were characterized by SEM, AFM, Raman spectroscopy, and contact angle measurements. The study also explores the bone implant viability of the generated structures. The results demonstrate that initial surface roughness affects the wettability and orientation of the resulting LIPSS, and structures with higher integrated fluence enhance cell differentiation and reduce bacterial activity, making them promising for bone implant compatibility and durability.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Nanoscience & Nanotechnology
Lucia H. Prado, David Boehringer, Anca Mazare, Lamborghini Sotelo, George Sarau, Silke Christiansen, Ben Fabry, Patrik Schmuki, Sannakaisa Virtanen, Wolfgang H. Goldmann, Alexander B. Tesler
Summary: Researchers have developed a convenient UV-grafting technique to covalently attach silicone-based coatings to solid substrates. The short-time exposure to UV light results in the formation of lubricant-infused slippery surfaces (LISS), while longer exposure leads to the formation of semi-rigid cross-linked polydimethylsiloxane (PDMS) coatings. These coatings exhibit excellent resistance to corrosion and biofouling in aquatic environments. Due to its simple fabrication, low cost, rapid binding kinetics, eco-friendliness, non-toxicity to aquatic life, and excellent wetting-repellent characteristics, this technology has great potential for implementation in aquatic environments.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
Johanna Meier, Patrick Haeuser, Christian Blumberg, Tim Smola, Werner Prost, Nils Weimann, Gerd Bacher
Summary: Site- and polarity-controlled core-shell InGaN/GaN nanorod LED structures were grown on Si(111) using metal organic vapor phase epitaxy. Uniform multiple quantum wells on polarization-free sidewalls were observed through scanning transmission electron microscope images. Spatially resolved photoluminescence mapping confirmed the emission at 3.0 eV from the polarization-free m-plane, with a fast recombination lifetime of about 490 ps at low temperatures. Quasi-resonant laser excitation demonstrated predominant radiative recombination at low excitation densities, while efficiency was decreased by Auger recombination and/or carrier leakage at high excitation densities.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Stephan Kastner, Matthias Urban, Anne-Kathrin Dietel, Andrea Csaki, Wolfgang Fritzsche
Summary: This paper introduces a simple and reliable device setup for time-resolved LSPR measurements using inexpensive array sensor chips. Gold nanoparticles are spotted onto glass substrates under different conditions to achieve optimal signal-to-noise ratio. Bulk sensitivity measurements with solutions of varying refractive index and surface sensitivity measurements with layer-by-layer deposition are performed to verify the setup and sensor chips. The presented cost-effective system allows parallel reading of more than 100 spots in a label-free platform, providing an interesting alternative for the development of future on-site diagnostics.
ADVANCED PHOTONICS RESEARCH
(2023)
Article
Computer Science, Interdisciplinary Applications
Benedikt Christopher Wolz, Christian Jaremenko, Florian Vollnhals, Lasse Kling, Jan Wrege, Silke Christiansen
Summary: Through silicon vias (TSVs) are a key enabling technology for interconnection and realization of complex three-dimensional integrated circuit (3D-IC) components. X-ray microscopy (XRM) is a rising method for analyzing the internal structure of samples without destructive sample preparation. However, there is a lack of evaluated scan recipes or best practices for studying TSVs using XRM. In recent years, there has been increased interest in automated machine learning and deep learning approaches for qualitative and quantitative inspection processes.
ENGINEERING REPORTS
(2022)
Review
Biochemical Research Methods
Andreas Kleiber, Daniel Kraus, Thomas Henkel, Wolfgang Fritzsche
Summary: Conventional flow cytometry (FC) has evolved as a powerful measurement method in clinical diagnostics, biology, life sciences and healthcare within the last decades. Imaging flow cytometry (IFC) extends the power of traditional FC by adding high resolution optical and spectroscopic information. Tomographic imaging flow cytometry (tIFC) was developed to access 3D information about the target particles, aiming to visualize surfaces and internal structures in a holistic way.