Search results for "layer"
showing 10 items of 2667 documents
Visualization of Moiré Magnons in Monolayer Ferromagnet
2023
| openaire: EC/H2020/788185/EU//E-DESIGN Two-dimensional magnetic materials provide an ideal platform to explore collective many-body excitations associated with spin fluctuations. In particular, it should be feasible to explore, manipulate, and ultimately design magnonic excitations in two-dimensional van der Waals magnets in a controllable way. Here we demonstrate the emergence of moiré magnon excitations, stemming from the interplay of spin-excitations in monolayer CrBr3 and the moiré pattern arising from the lattice mismatch with the underlying substrate. The existence of moiré magnons is further confirmed via inelastic quasiparticle interference, showing the appearance of a dispersion …
Surface modification of gold nanoparticles and nanoclusters
2016
Gold nanoparticles are used in many beneficial technological applications in biochemistry, medicine and electronics. Among them, monolayer protected gold nanoclusters (MPCs) have received a significant attention in the scientific community due to their well-defined atomic structure, which is important for fundamental studies of nanoparticles properties and their functionalization. These particles, with a precise number of atoms, exhibit size-dependent optical, chemical and electronic properties. The thesis focuses on the structure, preparation, characterization, and properties of MPCs. For multifunctional applications, gold nanoparticles are an ideal class of compounds for surface functiona…
Mixed Finite Elements for multilayered smart plates nonlocal analysis
2022
A mixed finite element formulation for the Eringen’s nonlocal analysis of smart, magneto-electro-elastic, multilayered plates is presented. Finite elements for different refined higher order plate layerwise theories are systematically developed. They ensure interface continuity and allow associating different values of the nonlocal parameter to the laminate layers. Standard 9-node and 16-node isoparametric, quadrilateral finite elements have been implemented and tested, showing the characteristics and limitations of the proposed approach.
A unified formulation for multilayered smart plate advanced models
2017
Magneto-electro-elastic (MEE) composite materials are attracting increasing consideration as they couple mechanical, electrical and magnetic fields and this makes them particularly suitable for smart applications. They are often employed as multilayered configurations that appear to be more effective than bulk MEE composites. Thus, reliable and efficient modelling tools are required for an effective design. The present talk deals with a unified formulation to derive advanced models for multilayered MEE plates. The approach is based on the condensation of the electro-magnetic state into the plate kinematics. This leads to models involving kinematical variables only, which takes the multifiel…
The Role of Donor and Acceptor Substituents on the Nonlinear Optical Properties of Gold Nanoclusters
2018
In recent years, a large number of monolayer-protected clusters (MPCs) have been studied by means of single crystal structure characterization. A central aspect of research on MPCs is the correlation of their interesting optical properties with structural features and the formulation of a theoretical framework that allows interpretation of their unique properties. For this, superatom and jellium models have been proven successful. Little attention, however, has been paid to the influence of the protecting ligands. Here, we investigate the effect of changes in [Au25(SR)18-x(SR′)x]−, where SR′ represents a para-substituted thiophenolate derivative (SPh-4-X). We computed the first hyperpolariz…
Optical and electronic properties of the two-dimensional materials InSe, WSe2 and MoS2
2017
El camp dels materials bidimensionals ha atret recentment l’atenció de la comunitat científica. Les propietats particulars que aquests materials presenten quan el seu espessor és reduït fins l’escala nanomètrica permeten preveure el seu potencial per a aplicacions de recerca, tant fonamental com tecnològica, en una varietat de camps que inclou la catàlisi, l’emmagatzematge d’energia, la detecció, els dispositius optoelectrònics i la informació quàntica. Aquesta tesi presenta l’estudi de les propietats òptiques i electròniques de diferents materials van der Waals bidimensionals: les àmpliament estudiades formes bidimensionals dels dicalcogenurs de metals de transició MoS2 i WSe2, i les menys…
Activation of Stainless Steel 316L Anode for Anion Exchange Membrane Water Electrolysis
2023
The increased emphasis on renewable energy has resulted in a surge of R&D efforts into hydrogen and battery research. The intensive electrochemical environment surrounding the anodic oxygen evolution reaction (OER) has plagued both the activity and stability of the catalytic layer, substrate and porous transport layer, ultimately affecting both these industries. Herein, we report the benefits of potential cycling (PC) a 316L stainless steel felt porous transport layer (PTL) for use in anion exchange membrane water electrolysis. The PC increased surface roughness and created a CrFe5Ni2-OxHy layer through the oxidation of iron as shown by SEM, EDS, XPS, XRD and Raman spectroscopy. Post-PC tes…
"Rokuja et pääse karkuun ilman jumpbootseja" : nonce borrowings in video gaming environment
2015
Videopelit ovat viime vuosina nousseet valtavirran vapaa-ajan aktiviteetiksi esimerkiksi television katselun ja urheilun ohelle. Videopelejä voi pelata monilla eri laitteilla kuten pelikonsoleilla, tietokoneilla sekä puhelimilla ja muilla kannettavilla laitteilla. Internet on myös mahdollistanut pelaamisen sekä kommunikoinnin pelaajien välillä paikasta riippumatta. Pelien ollessa valtaosin englanninkielisiä, pelaajat, jotka pelaavat yhdessä muiden kansalaisuuksien kanssa, valitsevat yleensä englannin yhteiseksi kommunikoinnin välineeksi. Englannin kielen asema sekä peleissä että tietokoneympäristössä yleensä on johtanut siihen, että esimerkiksi suomalaiset pelaajat käyttävät englanninkielis…
Structural and optical characterization of ZnS ultrathin films prepared by low-temperature ALD from diethylzinc and 1.5-pentanedithiol after various …
2019
The structural and optical evolution of the ZnS thin films prepared by atomic layer deposition (ALD) from the diethylzinc (DEZ) and 1,5-pentanedithiol (PDT) as zinc and sulfur precursors was studied. A deposited ZnS layer (of about 60 nm) is amorphous, with a significant S excess. After annealing, the stoichiometry improved for annealing temperatures &ge
Mechanical and optical properties of as-grown and thermally annealed titanium dioxide from titanium tetrachloride and water by atomic layer deposition
2021
Funding Information: This work was carried out within the MECHALD project funded by Business Finland (Tekes) and is linked to the Finnish Centers of Excellence in Atomic Layer Deposition (ref. 251220) and Nuclear and Accelerator Based Physics (refs. 213503 and 251353) of the Academy of Finland. Funding Information: This work was carried out within the MECHALD project funded by Business Finland (Tekes) and is linked to the Finnish Centers of Excellence in Atomic Layer Deposition (ref. 251220 ) and Nuclear and Accelerator Based Physics (refs. 213503 and 251353 ) of the Academy of Finland. Publisher Copyright: © 2021 The use of thin-films made by atomic layer deposition (ALD) is increasing in …