Article
Nanoscience & Nanotechnology
Felix Jungwirth, Fabrizio Porrati, Alfons G. Schuck, Michael Huth, Sven Barth
Summary: Two new precursors for focused electron beam-induced deposition (FEBID) of cobalt silicides have been synthesized, showing low sensitivity to changes in FEBID parameters and high growth rates. The deposits contain about 80% cleaved carbonyl ligands and exhibit temperature-dependent electrical properties, with magnetoresistance behavior indicative of tunneling magnetoresistance. Postgrowth irradiation treatment substantially reduces the observed magnetoresistance.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Felix Jungwirth, Daniel Knez, Fabrizio Porrati, Alfons G. Schuck, Michael Huth, Harald Plank, Sven Barth
Summary: The material composition and electrical properties of nanostructures obtained from focused electron beam-induced deposition (FEBID) using manganese and vanadium carbonyl precursors were investigated. The study found differences in composition and properties between FEBID and chemical vapor deposition (CVD) deposits, with FEBID deposits having insulating properties and a tendency for postgrowth oxidation.
Article
Materials Science, Multidisciplinary
P. Muusha, B. Stanford, M. Kolbe, D. M. Matson
Summary: When predicting microstructural evolution in spray-forming processes, it is crucial to understand the cooling rates during solidification. Evaluating cooling rates in the mushy-zone stage is challenging due to the simultaneous removal of sensible and latent heat. This study develops a model that relates liquid and solid cooling rates, considering melt thermophysical properties and the influence of phase change on radiative transport.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
H. Y. Hong, D. H. Kim, S. O. Won, J. K. Lee, S. D. Park, S. M. Choi, S. H. Bae, K. Park
Summary: By introducing Cu2-ySe nanoinclusions into the Bi0.86Ba0.14CuSeO matrix, the electrical conductivity and thermoelectric properties can be improved while reducing lattice thermal conductivity, leading to enhanced thermoelectric performance.
Increasing the content of Cu2-ySe significantly boosts the electrical conductivity of the composite materials, with the best dimensionless figure-of-merit achieved at x = 0.15.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Jun Hwan Moon, Seunghyun Kim, Taesoon Kim, Yoo Sang Jeon, Yanghee Kim, Jae-Pyoung Ahn, Young Keun Kim
Summary: Nanoscale ruthenium and ruthenium alloys with low resistivity values are potential candidates for interconnect and barrier materials in integrated circuits. Electrodeposition can produce ruthenium nanowires with excellent resistivity and microstructure.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Lijuan Xu, Yunfei Zheng, Zhenquan Liang, Xiang Xue, Shiwei Han, Shulong Xiao, Jing Tian, Yuyong Chen
Summary: The microstructure evolution, high temperature tensile properties, and creep behavior of TiB, TiC, and Y2O3/α-Ti composite were investigated. It was found that reinforcements could effectively impede the movement of dislocations and improve the creep resistance. The dominant mechanism of creep process was dislocation climbing at both 650 degrees C and 700 degrees C.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Jia Ju, Kang Yin, Mengfei Fang, Hong Cai, Huan Liu
Summary: N-type Bi-doped Mg-2(Si0.3Ge0.04Sn0.66)(1-x)Bi-x (0<= 0.03) compounds were successfully fabricated by solid-state reaction-spark plasma sintering (SPS). The prepared samples exhibited nearly phase pure Bi-doped solid solutions according to XRD results. The lattice constant and electrical conductivity increased with increasing Bi content, while the Seebeck coefficient decreased. The figure of merit (ZT) decreased at low temperatures and increased at high temperatures as the Bi content increased. At a temperature of 800K, the ZT value for x = 0.03 was about 1.3, compared to 1.1 for x = 0.01.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Ceramics
O. R. K. Montedo, R. B. Nuernberg, R. H. Piva, J. Jiusti, S. Arcaro, D. H. Piva
Summary: This study evaluated the electrical behavior of a glass ceramic LZSA composition monolith as a function of the thickness of crystalline layer formed on the monolith surface. The results showed that the resistivity increased with higher thermal treatment temperature, leading to a decrease in electrical conductivity. Monoliths thermally treated at 850 degrees C showed potential for dielectric industrial applications based on their electrical behavior.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
T. Miruszewski, K. Dzierzgowski, P. Winiarz, S. Wachowski, A. Mielewczyk-Gryn, M. Gazda
Summary: In this study, the partial conductivity of oxygen ions in BaCe0.6Zr0.2Y0.2O3 was investigated using a modified DC Hebb-Wagner polarization method. The results showed that protons have an influence on the conduction mechanism of oxygen ions, providing valuable information for the analysis of charge carrier interactions in mixed-conducting materials.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Engineering, Electrical & Electronic
Tian Tian, Guorong Li, Slavko Bernik, Mateja Podlogar, Xue Shi, Xuezheng Ruan, Liaoying Zheng
Summary: By doping with Co3O4 at a concentration of 0.5 mol.%, the ZnO-Cr2O3-based ceramics exhibit a high coefficient of nonlinearity (alpha) of 73 and a low leakage current of less than 0.2 mu A/cm2, indicating improved performance.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
Zishuai Zhang, Benjamin A. W. Mowbray, Colin T. E. Parkyn, Chris T. E. Waizenegger, Aubry S. R. Williams, Eric W. Lees, Shaoxuan Ren, Yongwook Kim, Ryan P. Jansonius, Curtis P. Berlinguette
Summary: This study introduces an electrochemical flow reactor that converts limestone into a chemical precursor of cement while also generating pure streams of oxygen, hydrogen, and carbon dioxide, potentially reducing carbon emissions in cement production.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Chemistry, Physical
Yunfei Zheng, Lijuan Xu, Jianxin Yu, Zhenquan Liang, Xiang Xue, Shulong Xiao, Jing Tian, Yuyong Chen
Summary: Two kinds of (TiB + TiC + Y2O3)/alpha-Ti composites with different compositions were prepared, and the properties of these composites, including tensile strength and creep resistance, were investigated. The composites showed stable structures and exhibited enhanced strength and improved creep resistance compared to the matrix alloy. The reinforcements played a crucial role in load transfer strengthening and impeding dislocation movement, leading to the observed improvements in mechanical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Sajeevi S. Withanage, Saiful Khondaker
Summary: This study reports the low pressure chemical vapor deposition (LPCVD) growth of PdSe2 at a significantly lower growth temperature of 250 degrees C. The study examines the structural and electrical properties of the synthesized films and demonstrates the potential applications of PdSe2 in electronic devices.
Article
Materials Science, Ceramics
K. Hembram, T. N. Rao, R. S. Srinivasa, A. R. Kulkarni
Summary: The study found that CaO doping significantly affects the microstructure and electrical properties of the ZnO-Bi2O3 system, resulting in changes in grain size and density. Analysis through X-ray diffraction and impedance spectroscopy revealed the crystal growth mechanism and conductivity behavior after CaO doping.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Key Simfroso, Shena Ramyr Cabo, Romnick Unabia, Angelito Britos, Pawel Sokolowski, Rolando Candidato
Summary: This work reports the microstructural characteristics and phase composition of solution precursor plasma-sprayed (SPPS) titania-based coatings using a catalyst-free precursor. The thermal behavior of the solution precursor changed with increasing molar concentration. The coatings exhibited a porous structure at lower concentrations and dense coating formation with micropores at higher concentrations.
Article
Nanoscience & Nanotechnology
Raphael Boeckle, Masiar Sistani, Martina Bazikova, Lukas Wind, Zahra Sadre-Momtaz, Martien den Hertog, Corban G. E. Murphey, James F. Cahoon, Walter M. Weber
Summary: Metal-semiconductor heterostructures with geometrically reproducible and abrupt Schottky nanojunctions are crucial for emerging electronic technologies. By implementing a nanoscale Al-Si-Al heterostructure with single elementary, monocrystalline Al leads and sharp Schottky junctions, and utilizing a three top-gate architecture, transistor-level reconfiguration is enabled, expanding device functionality and providing additional logical inputs. The demonstrated material system and logic gates show high compatibility with state-of-the-art complementary metal-oxide semiconductor technology, potentially paving the way for future adaptive computing systems.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Wolfgang E. Ernst, Maximilian Lasserus, Daniel Knez, Ferdinand Hofer, Andreas W. Hauser
Summary: Nanoparticles of gold and vanadium oxide were synthesized by doping cold helium droplets in a molecular beam apparatus, and characterized using various techniques. Janus particles of Au and V2O5 were identified after deposition, with V2O5 reducing to V2O3 at high temperatures and restructuring of gold atoms into a Wulff-shaped cluster layer. The temperature-dependent dynamic interplay between gold and vanadium oxide in structures of a few nanometers size was the central topic of this study.
FARADAY DISCUSSIONS
(2023)
Article
Materials Science, Multidisciplinary
Michael Oberaigner, Alexander Clausen, Dieter Weber, Gerald Kothleitner, Rafal E. Dunin-Borkowski, Daniel Knez
Summary: Position averaged convergent beam electron diffraction (PACBED) is a convenient and precise technique for determining thickness in a scanning transmission electron microscope. The method can be automated using convolutional neural networks (CNNs) to enhance speed and ease of application, but simulation and training can be computationally expensive. To simplify the process, a server-based database of pretrained CNN models accessed through a web service is proposed. A working prototype with a shared CNN database for three material systems demonstrates the usability of the method, allowing microscope operators to determine specimen thickness quickly and reproducibly during a session, without prior knowledge of machine learning or multislice modeling. The service can also be integrated into other software and workflows through the API.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Chemistry, Multidisciplinary
Raphael Behrle, Vanessa Krause, Michael S. Seifner, Benedikt Koestler, Kimberly A. Dick, Matthias Wagner, Masiar Sistani, Sven Barth
Summary: Si1-xGex nanowires (NWs) were prepared using a single-source precursor with preformed Si-Ge bonds through gold-supported chemical vapor deposition (CVD). The process reduces the control parameters associated with decomposition characteristics and dosing of individual precursors. The synthesized Si1-xGex/Au core-shell NWs exhibit metal-like behavior and show potential for applications in nano- and quantum-electronics.
Article
Chemistry, Multidisciplinary
Efthymia Vakalopoulou, Daniel Knez, Marco Sigl, Gerald Kothleitner, Gregor Trimmel, Thomas Rath
Summary: Silver bismuth sulfide (AgBiS2) has shown impressive properties in thermoelectric and photovoltaic applications, and has the potential to replace toxic semiconductors. A new synthesis route using metal xanthates as precursors for AgBiS2 nanocrystals has been reported. The study revealed that the decomposition and formation of AgBiS2 nanocrystals can be initiated at room temperature by the ligand's amine functionality, even though the silver xanthate is insoluble in the solvent mixture.
Article
Chemistry, Multidisciplinary
Fabrizio Porrati, Sven Barth, Gian Carlo Gazzadi, Stefano Frabboni, Oleksii M. Volkov, Denys Makarov, Michael Huth
Summary: Recent advancements in additive manufacturing have allowed the fabrication of free-shaped 3D objects with micrometer-scale feature sizes. Among these methods, focused electron beam and focused ion beam-induced deposition offer high flexibility and accuracy, providing a wide range of materials for growth. The combination of 3D nanowriting and chemical vapor deposition techniques enables the synthesis of complex core-shell heterostructures, showcasing great potential for unlocking further functionalities.
Article
Physics, Applied
R. Behrle, M. Sistani, A. Lugstein, Z. Sadre Momtaz, M. I. den Hertog, D. Pogany, W. M. Weber
Summary: This study focuses on the analysis of low-frequency noise in Al2O3-passivated, monolithic, and crystalline Al-Ge-Al heterostructure nanowire field effect transistors. It investigates the occurrence of 1/f noise and random telegraph noise (RTN) in an accumulation mode, where a hole channel is formed by applying a back-gate potential V-G. The results suggest that 1/f noise can be analyzed using both the mobility and carrier number fluctuation models (MFM and CNFM) respectively.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Harald Fitzek, Martin Sterrer, Daniel Knez, Horst Schranger, Angelina Sarapulova, Sonia Dsoke, Hartmuth Schroettner, Gerald Kothleitner, Bernhard Gollas, Qamar Abbas
Summary: The charging of nanoporous carbon via electrodeposition of solid iodine from iodide-based electrolyte is an efficient and ecofriendly method to produce battery cathodes. The interactions at the carbon/iodine interface during different stages of the electrochemical process are investigated using in situ and ex situ methods. The results show the flushing out of water from the pores during iodine formation, irreversible oxidation of the carbon surface, and the reversible structural modifications of carbon electrodes during iodine formation in the nanopores.
Article
Chemistry, Multidisciplinary
Robert Winkler, Michele Brugger-Hatzl, Lukas Matthias Seewald, David Kuhness, Sven Barth, Thomas Mairhofer, Gerald Kothleitner, Harald Plank
Summary: Magnetic force microscopy (MFM) is extended by the additive direct-write fabrication of magnetic nano-cones via focused electron beam-induced deposition (FEBID) using an HCo3Fe(CO)(12) precursor. Highly crystalline nano-tips with minimal surface contamination and sub-15 nm apex radii are fabricated and benchmarked against commercial products. The results demonstrate high performance during MFM operation and virtually loss-free behavior after almost 8 hours of continuous operation, as well as no performance loss after more than 12 months of storage in ambient conditions for the FEBID-based Co3Fe MFM nano-probes introduced in this study.
Article
Nanoscience & Nanotechnology
Andreas Fuchsberger, Lukas Wind, Masiar Sistani, Raphael Behrle, Daniele Nazzari, Johannes Aberl, Enrique Prado Navarrete, Lada Vukusic, Moritz Brehm, Peter Schweizer, Lilian Vogl, Xavier Maeder, Walter M. Weber
Summary: Reconfigurable field-effect transistors, such as SiGe-based transistors, offer dynamic programming capabilities, reducing transistor count and circuit path delay. However, Ge-based prototypes have faced issues with interface instability and current-voltage symmetry. A new SiGe-based technology has been developed, featuring a vertical Si-Si0.67Ge0.33 heterostructure and monolithic integration with Al contacts for stability and improved performance. The design includes a three top-gate transistor and a hysteresis-free Si/SiO2/HfO2 gate stack for polarity control and leakage current suppression. This technology represents a breakthrough in Ge-based transistor performance and stability.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Robert Winkler, Michele Brugger-Hatzl, Fabrizio Porrati, David Kuhness, Thomas Mairhofer, Lukas M. Seewald, Gerald Kothleitner, Michael Huth, Harald Plank, Sven Barth
Summary: This study provides solid evidence on the decomposition process of the HFeCo3(CO)(12) precursor, emphasizing the influence of microstructure and composition on the properties of electron beam-induced deposits. It reveals the activity of different fragmentation channels during single-spot growth processes.
Article
Chemistry, Multidisciplinary
Sebastian Lamb-Camarena, Fabrizio Porrati, Alexander Kuprava, Qi Wang, Michal Urbanek, Sven Barth, Denys Makarov, Michael Huth, Oleksandr V. Dobrovolskiy
Summary: Magnonics is a rapidly developing field in nanomagnetism, with potential applications in information processing systems. This study demonstrates the fabrication of 3D magnonic nanoconduits using the focused-electron-beam induced deposition (FEBID) technique. The researchers use Brillouin light scattering (BLS) spectroscopy to compare the spin-wave resonances of 2D and 3D nanostructures, revealing significant qualitative differences due to the non-uniformity of the internal magnetic field. This work highlights the additive manufacturing capability of FEBID for magnetic 3D nanoarchitectures and presents the first characterization of FEBID conduits using BLS spectroscopy.
Article
Materials Science, Biomaterials
Cristina de la Encarnacion, Felix Jungwirth, David Vila-Liarte, Carlos Renero-Lecuna, Safiyye Kavak, Inaki Orue, Claire Wilhelm, Sara Bals, Malou Henriksen-Lacey, Dorleta Jimenez de Aberasturi, Luis M. Liz-Marzan
Summary: Hyperthermia has been shown to be an effective and selective cancer therapy strategy by heating malignant cells above 42 degrees C to trigger cell death. Magnetic and photothermal hyperthermia can benefit from the use of nanomaterials. This hybrid colloidal nanostructure, consisting of plasmonic gold nanorods covered by a silica shell and subsequently grown with iron oxide nanoparticles, is responsive to both external magnetic fields and near-infrared irradiation, enabling targeted magnetic separation and photothermal heating.
JOURNAL OF MATERIALS CHEMISTRY B
(2023)