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New Developments in Physics of Advanced Materials
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New Developments in Physics of Advanced Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Physics".

Deadline for manuscript submissions: closed (10 March 2023) | Viewed by 9896

Special Issue Editors

Dr. Jan Lancok

E-Mail Website
Guest Editor
Head of Department Analyses of Functional Materials at Institute of Physics Czech Academy of Sciences, Prague, Czech Republic
Interests: fabrication of thin films by physical vapor deposition techniques; development of new hybrid deposition systems combining deposition techniques and processes such as laser ablation, magnetron sputtering, plasma jet, r.f. discharges, and electron beam evaporations; characterization of functional properties of thin films and nanostructures for sensors and optoelectronics applications
Dr. Daniel Moraru

E-Mail Website
Guest Editor
Department of Electronics and Materials Science, Faculty of Engineering, Graduate School of Science and Technology, Shizuoka University, Johoku 3-5-1, Shizuoka 432-8011, Japan
Interests: semiconductor nanoscale devices; single-electron tunneling via dopant-atoms in Si nano-transistors (low and high temperatures); atomistic effects in transport through low-dimensional pn diodes and pin diodes (including tunnel diodes); nanostructure/nanodevice fabrication and basic characterization; first-principles simulations of semiconductor nanostructures
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Felicia Iacomi

E-Mail Website1 Website2
Guest Editor
Faculty of Physics, Alexandru Ioan Cuza University, 700506 Iasi, Romania
Interests: physics of advanced materials–nanoparticle synthesis; thin film deposition (sputtering, thermal vacuum deposition, spin coating); characterization (XRD, XPS, UV-Vis, FTIR, EPR) transport phenomena; functional properties (electrical properties, effect hall, optical properties, magnetic properties, sensing properties); advanced applications
Special Issues, Collections and Topics in MDPI journals
Dr. Isabelle Berbezier

E-Mail Website
Guest Editor
Institut Materiaux Microelectronique Nanosciences de Provence, 142 Av. Escadrille Normandie Niemen, 13013 Marseille, France
Interests: nanostructures Si (Ge); self-assembly, nanostructuring; doping type n (Sb) and type p (B); instability of growth and ionic erosion; relaxation of constraints
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is devoted to new developments in the physics of advanced materials and includes all types of materials (inorganic, organic, hybrid, bulk, low dimensional systems, thin films, layers, powders, nanocomposites), materials design, simulation models, preparation, characterization, and advanced applications (modern electronics, spintronics, photonics, energy and environment, sensors, medical applications).

The issue covers structural studies and studies on all type of phenomena observed at the interaction of advanced materials with electrical, magnetic, and electromagnetic fields, and controlled atmospheres and includes but is not limited to the following topics:

  • Thin films and nanostructures for modern electronics;
  • Laser–material interactions and processing;
  • Materials for energy and environment;
  • Magnetic materials, spintronics, and related devices;
  • Nanostructures and low dimensional systems;
  • Emerging electronic memory materials and devices;
  • Polymer materials and composites;
  • Functional materials and applications;
  • New developments in sensing materials and sensor devices;
  • Trends in condensed matter theory

Dr. Jan Lancok
Dr. Daniel Moraru
Prof. Dr. Felicia Iacomi
Dr. Isabelle Berbezier
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • advanced materials
  • interaction phenomena
  • surface and interface processes
  • transport phenomena
  • simulation models
  • applications

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (5 papers)

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Research

12 pages, 4422 KiB  
Article
Subthreshold Laser Ablation Measurements by Langmuir Probe Method for ns Irradiation of HfO2 and ZrO2
by Radu Udrea, Stefan Andrei Irimiciuc and Valentin Craciun
Materials 2023, 16(2), 536; https://doi.org/10.3390/ma16020536 - 5 Jan 2023
Cited by 1 | Viewed by 1636
Abstract
The unbiased Langmuir probe (LP) method was used to perform measurements on HfO2 and ZrO2 samples around the laser ablation threshold on a wide range of irradiation conditions. Important changes in the lifetime (from ms to μs) and the shape of [...] Read more.
The unbiased Langmuir probe (LP) method was used to perform measurements on HfO2 and ZrO2 samples around the laser ablation threshold on a wide range of irradiation conditions. Important changes in the lifetime (from ms to μs) and the shape of the charge particle current were seen with the increase of the laser fluence. The ablation threshold was estimated by evaluating the overall average ablated charge as a function of the laser fluence. Above the ablation threshold, the generation of high kinetic species is seen, which can reach several keV. An important jump in ion acceleration potential is observed for values above 1 J/cm2, which coincides with the dominant presence of negative ions in the plasma. The evolution of several plasma parameters (ion density, expansion velocity, electron temperature, Debye length) was investigated and correlated with the fundamental ablation mechanism involved in various irradiation regimes. The LP data were correlated with COMSOL simulations on the maximum surface temperature reached during irradiation. Important correlations between the evaporation and melting processes and ablation threshold fluence and ion acceleration phenomena are also reported. Full article
(This article belongs to the Special Issue New Developments in Physics of Advanced Materials)
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14 pages, 8846 KiB  
Article
Producing Soft Magnetic Composites by Spark Plasma Sintering of Pseudo Core–Shell Ni–Fe Alloy@Mn0.5Zn0.5Fe2O4 Powders
by Loredana Cotojman, Traian Florin Marinca, Florin Popa, Bogdan Viorel Neamțu, Virgiliu Călin Prică and Ionel Chicinaș
Materials 2023, 16(2), 501; https://doi.org/10.3390/ma16020501 - 4 Jan 2023
Cited by 2 | Viewed by 1624
Abstract
Soft magnetic composite (SMC) cores have been obtained by Spark Plasma Sintering (SPS) using pseudo core–shell powders. Pseudo core–shell powders are formed by a core of soft magnetic particle (nanocrystalline permalloy or supermalloy) surrounded by a thin layer (shell) of nanosized soft ferrite [...] Read more.
Soft magnetic composite (SMC) cores have been obtained by Spark Plasma Sintering (SPS) using pseudo core–shell powders. Pseudo core–shell powders are formed by a core of soft magnetic particle (nanocrystalline permalloy or supermalloy) surrounded by a thin layer (shell) of nanosized soft ferrite (Mn0.5Zn0.5Fe2O4). Three compositions of pseudo core–shell powders were prepared, with 1, 2 and 3 wt.% of manganese–zinc mixt ferrite. The pseudo core–shell powders were compacted by SPS at temperatures between 500 and 700 °C, with a holding time ranging from 0 to 10 min. Several techniques have been used for characterization of the samples, both, powders and compacts X-ray diffraction (XRD, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), magnetic hysteresis measurements (DC and AC) and electrical resistivity. The electrical resistivity is in the order of 1 × 10−2 Ωm, 3–4 orders of magnitude higher than supermalloy electrical resistivity. The SPS at lower temperatures (500 °C) conserves the initial phases of the composite, but increasing the sintering temperature and/or sintering time produces a solid-state reaction between the alloy and ferrite phases, with negative consequence on the magnetic properties of the compacts. The initial relative permeability is around 40 and remains constant until to 2000 Hz. The power losses are lower than 2 W/kg until to 2000 Hz. Full article
(This article belongs to the Special Issue New Developments in Physics of Advanced Materials)
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16 pages, 7534 KiB  
Article
Langmuir Probe Perturbations during In Situ Monitoring of Pulsed Laser Deposition Plasmas
by Ștefan-Andrei Irimiciuc, Sergii Chertopalov, Michal Novotný, Valentin Craciun, Jan Lancok and Maricel Agop
Materials 2022, 15(8), 2769; https://doi.org/10.3390/ma15082769 - 9 Apr 2022
Viewed by 1563
Abstract
The recent advancements in pulsed laser deposition (PLD) control via plasma diagnostics techniques have been positive and raised questions on the limitation of some techniques, such as the Langmuir probe (LP). The particularities of laser-produced plasma can lead to incorrect interpretation of collected [...] Read more.
The recent advancements in pulsed laser deposition (PLD) control via plasma diagnostics techniques have been positive and raised questions on the limitation of some techniques, such as the Langmuir probe (LP). The particularities of laser-produced plasma can lead to incorrect interpretation of collected electrical signal. In this paper, we explored the limitations of LP as a technique for in situ PLD control by performing investigations on several metallic plasmas, expanding in various Ar atmosphere conditions. Sub-microsecond modulation was seen in the reconstructed IV characteristics attributed to non-equilibrium dynamics of the ejected charges. A perturbative regime was recorded for Ar pressures higher than 2 Pa, where ionic bursts were observed in the electron saturation region. This perturbation was identified as a plasma fireball. A non-linear multifractal model was developed here to explore these new regimes of the LP. The strange attractors characterizing each fireball were reconstructed, and their evolution with the Ar pressure is discussed. Both short- and long-time non-linear behavior were correlated via probe bias, and the pressure effect on the strange attractor’s defining the fireball-like behavior was investigated. A good correlation was noticed between the simulated data and experimental findings. Full article
(This article belongs to the Special Issue New Developments in Physics of Advanced Materials)
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14 pages, 6416 KiB  
Article
Influence of Random Plasmonic Metasurfaces on Fluorescence Enhancement
by Veronica Anăstăsoaie, Roxana Tomescu, Cristian Kusko, Iuliana Mihalache, Adrian Dinescu, Catalin Parvulescu, Gabriel Craciun, Stefan Caramizoiu and Dana Cristea
Materials 2022, 15(4), 1429; https://doi.org/10.3390/ma15041429 - 15 Feb 2022
Cited by 5 | Viewed by 2281
Abstract
One of the strategies employed to increase the sensitivity of the fluorescence-based biosensors is to deposit chromophores on plasmonic metasurfaces which are periodic arrays of resonating nano-antennas that allow the control of the electromagnetic field leading to fluorescence enhancement. While artificially engineered metasurfaces [...] Read more.
One of the strategies employed to increase the sensitivity of the fluorescence-based biosensors is to deposit chromophores on plasmonic metasurfaces which are periodic arrays of resonating nano-antennas that allow the control of the electromagnetic field leading to fluorescence enhancement. While artificially engineered metasurfaces realized by micro/nano-fabrication techniques lead to a precise tailoring of the excitation field and resonant cavity properties, the technological overhead, small areas, and high manufacturing cost renders them unsuitable for mass production. A method to circumvent these challenges is to use random distribution of metallic nanoparticles sustaining plasmonic resonances, which present the properties required to significantly enhance the fluorescence. We investigate metasurfaces composed of random aggregates of metal nanoparticles deposited on a silicon and glass substrates. The finite difference time domain simulations of the interaction of the incident electromagnetic wave with the structures reveals a significant enhancement of the excitation field, which is due to the resonant plasmonic modes sustained by the nanoparticles aggregates. We experimentally investigated the role of these structures in the fluorescent behaviour of Rhodamine 6G dispersed in polymethylmethacrylate finding an enhancement that is 423-fold. This suggests that nanoparticle aggregates have the potential to constitute a suitable platform for low-cost, mass-produced fluorescent biosensors. Full article
(This article belongs to the Special Issue New Developments in Physics of Advanced Materials)
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13 pages, 4263 KiB  
Article
On the Dynamics of Transient Plasmas Generated by Nanosecond Laser Ablation of Several Metals
by Stefan Andrei Irimiciuc, Sergii Chertopalov, Michal Novotný, Valentin Craciun and Jan Lancok
Materials 2021, 14(23), 7336; https://doi.org/10.3390/ma14237336 - 30 Nov 2021
Cited by 5 | Viewed by 1777
Abstract
The dynamics of transient plasma generated by UV ns-laser ablation of selected metals (Co, Cu, Ag, Bi) were investigated by the Langmuir Probe method in angle- and time-resolved modes. Multiple ionic and electronic structures were seen for all plasmas with some corresponding to [...] Read more.
The dynamics of transient plasma generated by UV ns-laser ablation of selected metals (Co, Cu, Ag, Bi) were investigated by the Langmuir Probe method in angle- and time-resolved modes. Multiple ionic and electronic structures were seen for all plasmas with some corresponding to anions or nanoparticle-dominated structures. The addition of an Ar atmosphere energetically confined the plasma and increased the charge density by several orders of magnitude. For pressure ranges exceeding 0.5 Pa fast ions were generated in the plasma as a result of Ar ionization and acceleration in the double layer defining the front of the plasma plume. Several correlations between the target nature plasma properties were attempted. The individual plasma structure expansion velocity increases with the melting point and decreases with the atomic mass while the corresponding charged particle densities decrease with the melting point, evidencing the relationship between the volatility of the sample and the overall abated mass. Full article
(This article belongs to the Special Issue New Developments in Physics of Advanced Materials)
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