A5078471465- Carbon Nanotubes in Composites
- GaN-based semiconductor devices and materials
- Metal and Thin Film Mechanics
- Acoustic Wave Resonator Technologies
- Graphene research and applications
- Gas Sensing Nanomaterials and Sensors
- Semiconductor materials and devices
- Diamond and Carbon-based Materials Research
- Surface Modification and Superhydrophobicity
- Quantum Dots Synthesis And Properties
- Magnetic properties of thin films
- Advanced materials and composites
- Advanced Battery Technologies Research
- Force Microscopy Techniques and Applications
- Conducting polymers and applications
- Advanced battery technologies research
- Advancements in Battery Materials
- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- MXene and MAX Phase Materials
- Perovskite Materials and Applications
- ZnO doping and properties
- Mechanical and Optical Resonators
- Chalcogenide Semiconductor Thin Films
- Advanced Memory and Neural Computing
GNS Science
2018-2024
Riga Technical University
2024
Grace (Germany)
2024
MacDiarmid Institute for Advanced Materials and Nanotechnology
2017-2021
Victoria University of Wellington
2017-2021
Chemnitz University of Technology
2011-2014
Fraunhofer Institute for Electronic Nano Systems
2014
Carl Zeiss (Germany)
1996
Otto-von-Guericke University Magdeburg
1980
Water electrolysis has been used to produce green hydrogen, for which identifying optimum operation parameters is crucial improve its energy efficiency and consumption. This paper a commercial proton exchange membrane (PEM) water electrolyser stack (180 W) demonstrate the correlation between operating current change, temperature, flow rate their impact on thermal electrical performance of stack. It was found that control regime temperature can offset voltage ageing in long-term with no...
Tungsten carbides have an electronic density of states near the Fermi level similar to platinum and are predicted exhibit high intrinsic activity toward hydrogen evolution reaction (HER). However, traditional fabrication routes typically require synthesis temperatures, resulting in undesirable agglomeration losses electrocatalytic performance. Herein, we demonstrate use thermal spikes, a high-energy transient phenomenon from ion implantation, synthesize tungsten carbide nanoparticle films...
Abstract Piezoelectric energy generation is relevant for developing advanced electronics. However, the poor understanding of influence triboelectricity as an alternate charge mechanism has, in many cases, resulted reporting exaggerated piezoelectric outputs. Herein, signal output systematically investigated from a range organic materials (poled polyvinylidene fluoride (PVDF)), moderately (heat‐treated PVDF), and non‐piezoelectric (non‐poled polytetrafluoroelthylene (Teflon) nylon) under...
Magnetic sensors are key elements in many industrial, security, military, and biomedical applications. Heusler alloys promising materials for magnetic sensor applications due to their high spin polarization tunable properties. The dynamic field range of is strongly related the perpendicular anisotropy (PMA). By tuning PMA, it possible modify sensing direction, sensitivity even accuracy sensors. Here, we report PMA a Co2MnGa alloy film via argon (Ar) ion irradiation. MgO/Co2MnGa/Pd films with...
Modern computing technology is based on silicon. To date, a cost-effective and easy to implement method obtain isotopically pure silicon highly desirable for attaining efficient heat dissipation in microelectronic devices hosting spin qubits quantum computing. We propose that it possible use 28Si+ ion beam an near-surface region wafer However, this requires stable, high current, 28Si beam. This work presents discusses the instrumentation details experimental parameters involved generating...
Abstract Molybdenum carbides are promising low‐cost electrocatalysts for electrolyzers, fuel cells, and batteries. However, synthesis of ultrafine, phase‐pure carbide nanoparticles ( diameter < 5 nm) with large surface areas remains challenging due to uncontrollable agglomeration that occurs during traditional high temperature syntheses. This work presents a scalable, physical approach synthesize molybdenum at room by ion implantation. By tuning the implantation conditions, various...
A novel approach to introduce catalytic sites carbon and graphite felts in order improve electrode activity investigate the effectiveness of specific active for vanadium flow battery (VFB) has been achieved via ion beam implantation. Here, both N2+ Ne+ implantation is used show that positive (VO2+/VO2+) redox reaction preferentially occurs at introduced defect sites, not nitrogen-containing groups. This shown through short charge discharge tests electrochemical impedance spectroscopy, with...
We report on and emphasize the versatility of conductive atomic force microscopy in characterizing vertically aligned carbon nanotubes (CNTs) aimed to be used via interconnect technology. The study is conducted multi-walled CNT arrays grown a copper-based metal line. Voltage-dependent current mapping current-voltage characteristics recorded down single allow for comprehensive insight into electric behaviour hybrid structure.
Nanocrystal-based electronic devices with multiple functionalities offer one avenue toward novel passive and active components. Here, we exhibit a planar fully air-processed thin film device that demonstrates photoinduced memristive behavior can be used as transistor, photodetector, or memory device. Following long-term (60 h) air exposure, unpackaged nanocrystal films develop reliable characteristics in tandem temperature, gate, photoresponse. The on/off values of more than 50 are achieved,...
The piezoelectric modulus of wurtzite aluminum nitride (AlN) is a critical material parameter for electrical components, ultimately contributing to the energy efficiency and achievable bandwidth modern communication devices. Here, we demonstrate that introduction metallic point-defects (Ti, Zr, Hf) improves as-received, unstrained, epitaxially grown AlN. metals are incorporated by ion implantation with an acceleration 30 keV fluence 1015 at cm−2, which causes elongation along c-axis. stored...
This manuscript outlines current research activities based on ion beam science at GNS Science in New Zealand. Ion analysis methods include Rutherford backscattering and nuclear reaction which trace back to Rutherford's famous 'gold foil' 'splitting the atom' experiments. These beam-based generally offer ability analyse materials for every element of periodic table, ppm concentrations, with depth profiles ranging from a few nm several microns. are now also used modify create new precisely....
Abstract Aluminum nitride (AlN) is a material for wide range of microwave‐frequency electronics devices, because its piezoelectric properties and high chemical stability. To improve the performance AlN‐based such as acoustic wave filters energy harvesters, an increased modulus desirable. Here, increase d 33 this achieved by ion implantation noble gases. For fluence 3 × 10 16 at cm −2 Ar + , 30% AlN obtained. The improvement attributed to gas atoms implanted into interstitial sites wurtzite...
Zusammenfassung Hintergrund und Ziel Letzte-Hilfe-Kurse können Bürger befähigen, mehr Menschen ein Sterben zu Hause ermöglichen. der Studie ist die Evaluation neu etablierten für Kinder Jugendliche. Materialien Methoden Neun Jugendliche mit insgesamt 128 Teilnehmern von 9–17 Jahren wurden durchgeführt. Die basiert auf mixed-methods erfolgte mittels eines Fragebogens. Ergebnisse 120 (94 %) nahmen an teil. Teilnehmer schätzten Möglichkeit, über Tod reden. 94 % fanden den Kurs hilfreich alle 92...
The instability of pyrite nanocrystals’ (NCs) surfaces toward defect formation has until now impeded most applications these materials. Here, we synthesize FeS2/FeSex core/shell NCs, with a shell largely composed hexagonal-phase FeSe. direct band gap was not significantly changed due to the iron selenide coating while reduced trap state influence on charge carriers revealed after reaction forming FeSex layer. NCs had higher surface electrical resistivity compared pyrite. In addition, net...