A5061945130- Transition Metal Oxide Nanomaterials
- Graphene research and applications
- 2D Materials and Applications
- Advanced Memory and Neural Computing
- Chalcogenide Semiconductor Thin Films
- Electronic and Structural Properties of Oxides
- Gas Sensing Nanomaterials and Sensors
- Electron and X-Ray Spectroscopy Techniques
- Catalytic Processes in Materials Science
- MXene and MAX Phase Materials
- Diamond and Carbon-based Materials Research
- Ferroelectric and Piezoelectric Materials
- Ferroelectric and Negative Capacitance Devices
- Catalysis and Oxidation Reactions
- Quantum Dots Synthesis And Properties
- Carbon Nanotubes in Composites
- Phase-change materials and chalcogenides
- Corrosion Behavior and Inhibition
- Vehicle emissions and performance
- ZnO doping and properties
- Ga2O3 and related materials
- Advanced Photocatalysis Techniques
- Advancements in Battery Materials
- Intermetallics and Advanced Alloy Properties
- Advanced Thermoelectric Materials and Devices
University of Groningen
2020-2025
Indian Institute of Science Bangalore
2023
Delft University of Technology
2019-2021
University of Tehran
2008-2021
Interface (United States)
2021
Islamic Azad University, Science and Research Branch
2019
University of Puerto Rico System
2012-2016
Oregon State University
2015
Corvallis Environmental Center
2015
Islamic Azad University Saveh
2011
We report on the temperature dependence of in-plane E2g and out-of-plane A1g Raman modes in high-quality few-layer MoS2 (FLMS) prepared using a high-temperature vapor-phase method. The materials obtained were investigated transmission electron microscopy. frequencies these two phonon found to vary linearly with temperature. first-order coefficients for E12g be (1.32 1.23) × 10–2 cm–1/K, respectively. thermal conductivity suspended FLMS at room was estimated ∼52 W/mK.
MoS2 is an important member of the transition metal dichalcogenides that emerging as a potential 2D atomically thin layered material for low power electronic and optoelectronic applications. However, critical fundamental question significant importance how surface energy hence wettability altered at nanoscale in particular, role crystallinity orientation. This work reports on synthesis large area films insulating substrates (SiO2/Si Al2O3) with different morphology via vapor phase deposition...
Unconventional ferroelectricity exhibited by hafnia-based thin films-robust at nanoscale sizes-presents tremendous opportunities in nanoelectronics. However, the exact nature of polarization switching remains controversial. We investigated a La0.67Sr0.33MnO3/Hf0.5Zr0.5O2 capacitor interfaced with various top electrodes while performing situ electrical biasing using atomic-resolution microscopy direct oxygen imaging as well synchrotron nanobeam diffraction. When electrode is reactive, we...
The surface chemistry of colloidal semiconductor nanocrystals (QDs) profoundly influences their physical and chemical attributes. insulating organic shell ensuring stability impedes charge transfer, thus limiting optoelectronic applications. Exchanging these ligands with shorter inorganic ones enhances mobility stability, which is pivotal for using materials as active layers LEDs, photodetectors, transistors. Among those, InP QDs also serve a model investigations. This study focuses on group...
A representation of the continuous flow microwave-assisted synthesis metal organic framework, MOF-74(Ni). Precursor solutions through a microwave nucleation zone leading to formation
We investigate the temperature dependent (83 K≤T≤523 K) frequency shift of 2Ag1 and 1Eg2 phonon modes in three dimensional topological insulator Bi2Se3, using Raman spectroscopy. The high quality single crystals Bi2Se3 were grown a modified Bridgman technique characterized by Laue diffraction resolution transmission electron microscopy. A significant broadening line shape red-shift frequencies observed with increase temperature. Polarized scattering measurement shows strong polarization...
Lead-free, silicon compatible materials showing large electromechanical responses comparable to, or better than conventional relaxor ferroelectrics, are desirable for various nanoelectromechanical devices and applications. Defect-engineered electrostriction has recently been gaining popularity to obtain enhanced at sub 100 Hz frequencies. Here, we report record values of electrostrictive strain coefficients (M
The crystal structure of LiNi0.5Mn1.5O4 (LNMO) can adopt either low-symmetry ordered (Fd3̅m) or high-symmetry disordered (P4332) space group depending on the synthesis conditions. A majority published studies agree superior electrochemical performance LNMO, but underlying reasons for improvement remain unclear due to fact that different thermal history samples affects other material properties such as oxygen content and particle morphology. In this study, were prepared with a new strategy...
Lead halide perovskite nanocrystals are highly attractive for next-generation optoelectronics because they easy to synthesize and offer great compositional morphological tunability. However, the replacement of lead by tin sustainability reasons is hampered unstable nature Sn2+ oxidation state an insufficient understanding chemical processes involved in synthesis. Here, optimized synthetic route demonstrated obtain stable, tunable, monodisperse CsSnI3 nanocrystals, exhibiting well-defined...
We report the optical and vibrational properties of nanocrystalline MoS2 thin films, which are comprised stripe-like partially edge-terminated vertically aligned (ETVA) nano-size crystals dispersed in ⟨001⟩ oriented regions, grown on large insulating substrates. From high-resolution transmission electron microscopy experiments, average grain size ETVA layers was found to be ∼5 nm consist three five monolayers. The flat regions were equivalent proportions films. films highly transparent...
3D superlattices made of colloidal quantum dots are a promising candidate for the next generation optoelectronic devices as they expected to exhibit unique combination tunable optical properties and coherent electrical transport through minibands. While most previous work was performed on 2D arrays, control over formation these systems is lacking, where limited long-range order energetical disorder have so far hindered potential metamaterials, giving rise disappointing properties. Here, it...
Metal borides, a class of materials intensively used in industry as superconductors, magnetic materials, or hot cathodes, remain largely unexplored at the nanoscale mainly due to difficulty synthesizing single-phase nanocrystals. Recent works have shown that synthetic methods lower temperatures (<400 °C) yield amorphous polydisperse nanoparticles, while phase purity is an issue higher temperatures. Among all metal-rich nickel borides (NixB) could be potential catalyst for broad range...
Abstract Germanane (GeH), a germanium analogue of graphane, has recently attracted considerable interest because its remarkable combination properties makes it an extremely suitable candidate to be used as 2D material for field effect devices, photovoltaics, and photocatalysis. Up now, the synthesis GeH been conducted by substituting Ca H in β‐CaGe 2 layered Zintl phase through topochemical deintercalation aqueous HCl. This reaction is generally slow takes place over 6 14 days. The new...
Efficient and sustainable synthesis of performant metal/nitrogen-doped carbon (M–N–C) catalysts for oxygen reduction evolution reactions (ORR/OER) is vital the global switch to green energy technologies–fuel cells metal–air batteries. This study reports a solid-phase template-assisted mechanosynthesis Fe–N–C, featuring low-cost FeCl3, 2,4,6-tri(2-pyridyl)-1,3,5-triazine (TPTZ), NaCl. A NaCl-templated Fe-TPTZ metal–organic material was formed using facile liquid-assisted grinding/compression....
Concurrent structural and electronic transformations in VO2 thin films are of 2-fold importance: enabling fine-tuning the emergent electrical properties functional devices, yet creating an intricate interfacial domain structure transitional phases. Despite importance understanding films, a detailed real-space atomic analysis which oxygen columns also resolved is lacking. Moreover, intermediate structures have remained elusive due to lack robust atomically quantitative analysis. Here, we...
Candle wax was used as a precursor for the production of diamond-nanotube composite in single step. The films were fabricated by sulfur-assisted hot-filament chemical vapor deposition technique. morphology analyzed scanning electron microscopy and transmission microscopy. Raman spectra show characteristic diamond band at 1,332 cm-1, D-band around 1,342 graphitic G-band 1,582 cm-1. energy-loss spectroscopy recorded carbon K-edge region shows signature features nanotube material. ability to...
Hafnia-based thin films exhibit unconventional ferroelectricity. These materials also show rich polymorphism, and thus temperature field-driven phase transitions, as well oxygen migration. In a bigger context of exploring the synergy between ferroelectricity diffusion-based structural phenomena, here we study temperature-dependent transitions in epitaxial Hf0.5Zr0.5O2(HZO)/La0.67Sr0.33MnO3 (LSMO, bottom electrode) heterostructures. We report topotactic their clear pathways both LSMO HZO...
Abstract The areal footprint of memristors is a key consideration in material‐based neuromorphic computing and large‐scale architecture integration. Electronic transport the most widely investigated memristive devices mediated by filaments, posing challenge to their scalability implementation. Here, compelling alternative device presented it demonstrated that downscaling leads enhancement memory window, while maintaining analog behavior, contrary expectations. designs directly integrated on...