Article
Chemistry, Multidisciplinary
Blandine Fontaine, Youssef Benrkia, Jean-Francois Blach, Christian Mathieu, Pascal Roussel, Ahmad I. Ayesh, Adlane Sayede, Sebastien Saitzek
Summary: Two polymorphic phases (alpha- and beta-Cu2V2O7) of copper pyrovanadate were synthesized and the mechanisms of phase transitions were studied using TGA and DSC. High temperature X-ray diffraction revealed negative thermal expansion coefficients of the lattice parameters. The optimal conditions for producing dense thin films were determined using thermogravimetric analysis and differential scanning calorimetry. The thin films exhibited a beta-Cu2V2O7 polycrystalline phase and showed absorption in the visible range, making them suitable for use as photoanodes.
Article
Chemistry, Physical
Yongjian Luo, Zhenxun Tang, Xiaozhe Yin, Chao Chen, Zhen Fan, Minghui Qin, Min Zeng, Guofu Zhou, Xingsen Gao, Xubing Lu, Jiyan Dai, Deyang Chen, Jun -Ming Liu
Summary: This study demonstrates that ferroelectric properties can be observed in non-capped dopant-free HfO2 thin films by adjusting the deposition temperature, oxygen pressure, and thickness. A maximum polarization strength of 14.7 mu C/cm(2) was achieved in a 7.4 nm-thick film, suggesting a new method for fabricating high-quality ferroelectric HfO2 thin films.
JOURNAL OF MATERIOMICS
(2022)
Article
Chemistry, Physical
Stefan Andrei Irimiciuc, Sergii Chertopalov, Maksym Buryi, Zdenek Remes, Martin Vondracek, Ladislav Fekete, Michal Novotny, Jan Lancok
Summary: CuI thin films were deposited with controlled morphology, structure, and defect nature in different Ar atmospheres. Band gap tailoring was achieved by controlling the plasma ion kinetic energy. Variation in Ar pressure allowed control over the nature of vacancies. Addition of Ar resulted in preferential scattering and energy losses of Cu ions in the plasma.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Rovena Veronica Pascu, George Epurescu, Iulian Boerasu, Ana -Maria Banici Niculescu, Dumitru Manica, Alexandra Maria Isabel Trefilov, Bogdan Alexandru Sava
Summary: Samarium doped ceria thin films were successfully deposited on Si (100) substrates at 500 and 600 degrees C using Pulsed Laser Deposition. X-ray Diffraction confirmed the presence of Samarium Doped Cerium Oxide crystalline compound in the films. Atomic Force Microscopy and Scanning Electron Microscopy revealed high quality films with low roughness, especially for the sample deposited at 600 degrees C. X-ray Photoelectron Spectroscopy showed an increased proportion of Ce3+ in the deposited films compared to the target. Spectroscopic Ellipsometry analysis calculated a refractive index under 2.2 in the visible and near-infrared domain. Nanoindentation tribometric measurements indicated a decrease in elasticity modulus and hardness with increasing substrate temperature. These films show potential as electrolyte materials for new generation electrochemical devices.
APPLIED SURFACE SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Prashant Bisht, Arvind Kumar, Abhishek Ghosh, Per Erik Vullum, Martin Fleissner Sunding, Branson D. Belle, Bodh Raj Mehta
Summary: In this study, WS2 thin films with controllable growth orientation were synthesized using pulsed laser deposition. The effect of growth parameters on the formation and properties of the films was investigated. The study found significant differences in the growth mechanisms, gas sensing parameters, and underlying mechanisms between vertically and horizontally grown films.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Coatings & Films
Falko Jahn, Steffen Weissmantel
Summary: Boron carbide is a super-hard material suitable for wear resistant coatings. Its hardness is significantly influenced by substrate temperature, with little effect from laser fluence.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Chemistry, Physical
Xiangnan Gong, Menglei Feng, Hong Wu, Hongpeng Zhou, Chunhung Suen, Hanjun Zou, Lijie Guo, Kai Zhou, Shijian Chen, Jiyan Dai, Guoyu Wang, Xiaoyuan Zhou
Summary: This work focuses on improving the quality of highly (100)-oriented SnSe thin films for thermoelectric applications. By controlling key parameters during pulsed-laser deposition and performing vacuum thermal annealing, the film quality was enhanced. The best crystal quality and uniform orientation were achieved on SiO2/Si substrate at 673 K followed by thermal annealing at 673 K for 30 min, showcasing promising Seebeck coefficient and power factor values.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Ryo Nakayama, Yuto Kawaguchi, Ryota Shimizu, Kazunori Nishio, Hiroyuki Oguchi, Sangryun Kim, Shin-ichi Orimo, Taro Hitosugi
Summary: Complex hydrides are important reducing agents, hydrogen storage materials, and ionic conductors. However, it is challenging to fabricate epitaxial thin films of complex hydrides due to the difficulty in maintaining stable [BH4]- complex anions during deposition. This study successfully achieved the growth orientation control of NaBH4 thin films and discussed the influence of lattice mismatch and stacking sequence on the control. The findings provide a basis for advanced investigations of complex hydrides and their surface and interfacial phenomena.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Analytical
T. V. Beatriceveena, K. I. Gnanasekar
Summary: Research on delafossite compounds has been focused on their layered structure and chemical or optoelectronic properties for industrial applications. However, synthesizing thin films has been challenging due to the low symmetry rhombohedral structures. This study successfully deposited AgInO2 thin films on glass substrate using pulsed laser deposition with high oxygen pressure, and the films exhibited n-type behavior and high selectivity towards hydrogen.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Multidisciplinary
Simon Shindler, Rong Yang
Summary: The detailed study of hydrolysis kinetics of marginally reactive fluoroacrylates demonstrates the full capability and limitations of the post-synthesis reaction. The hydrolysis of two fluoroacrylates, poly(1H,1H,2H,2H-perfluorooctyl acrylate) (pPFOA) and poly(2,2,3,4,4,4-hexafluorobutyl acrylate) (pHFBA), is characterized using X-ray photoelectron spectroscopy. The films degrade rapidly during hydrolysis without crosslinking or grafting, and an SN2 mechanism well describes the hydrolysis process.
Article
Materials Science, Multidisciplinary
Jakub Holovsky, Eva Horynova, Lukas Horak, Katarina Ridzonova, Zdenek Remes, Lucie Landova, Rupendra Kumar Sharma
Summary: Molybdenum oxide is a material with high bandgap, work function, and other interesting properties. Using Pulsed Laser Deposition, researchers were able to deposit high transparency MoO3 layers from stoichiometric MoO3 and metal Mo targets at different temperatures and oxygen pressures. Optical properties were accurately tracked using Photothermal Deflection Spectroscopy and Spectral Ellipsometry, while crystallinity and surface morphology were monitored using X-ray diffraction and Scanning Electron Microscopy. Increasing temperature led to smoother, denser layers, narrowing bandgap, and increased sub-gap absorption, with crystallization occurring above 400 degrees C. Sub-gap absorption around 1000 nm depended on temperature and weakly on oxygen pressure.
Article
Chemistry, Physical
Valter Kiisk, Michal Novotny, Margus Kodu, Siim Pikker, Tea Avarmaa, Jan Remsa, Jan Lancok, Martin Vrnata, Raivo Jaaniso
Summary: Many research activities focus on functional luminescent materials based on metal oxides and trivalent rare earth ions. Specific applications require optimizing material preparation, annealing, and excitation-detection techniques. In this study, pulsed laser deposition was used to obtain thin TiO2 films containing 1 at% of samarium or neodymium impurity ions. The effects of pulsed laser annealing on their structure and luminescent properties were investigated.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
C. W. Bond, Y. Jin, P. Gomez-Rodriguez, E. Nieto-Pinero, R. L. Leonard, J. Gonzalo, R. Serna, A. K. Petford-Long, J. A. Johnson
Summary: Optically-active thin films can act as photon energy converters in applications like LEDs and photovoltaics. By using novel synthesis techniques, control at the nanoscale level can lead to improved efficiency. Layered thin films with nanocrystalline layers and precise dopant distribution have shown steady emission with chromaticity coordinates close to pure white light, making them advantageous for UV-pumped white light LED applications.
Article
Chemistry, Physical
N. R. Checca, F. F. Borghi, A. M. Rossi, A. Mello, A. L. Rossi
Summary: This study investigated the nanostructure of calcium phosphate films formed by pulsed laser deposition under high-pressure gas environment, using infrared and green laser sources. Five different calcium phosphate structures were identified, highlighting the complexity of the deposition and growth mechanism in this process.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Santosh Kumar Yadav, Subhabrata Dhar
Summary: The study demonstrates that using pulsed laser deposition technique, continuous epitaxial films as thin as 3 nm of NiO can be grown on c-sapphire substrates with high crystalline quality and smooth surface. It also reveals the co-existence of 60 degrees-rotated (111) triangular domains and a very low density of 60 degrees dislocations in the films.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2021)
Article
Instruments & Instrumentation
E. Georgali, N. Patronis, A. Anastasiadis, M. Axiotis, S. Harissopulos, K. Karfopoulos, M. Kokkoris, A. Lagoyannis, C. Potiriadis, R. Vlastou
Summary: In this work, a peak analysis and unfolding method for low energy gamma-ray spectroscopy is introduced, which is based on extensive Monte Carlo simulations to determine the peak integral of a photopeak.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2021)
Article
Nanoscience & Nanotechnology
Yasmin Esqueda-Barron, Angel Perez del Pino, Pablo Garcia Lebiere, Arevik Musheghyan-Avetisyan, Enric Bertran-Serra, Eniko Gyorgy, Constantin Logofatu
Summary: Research has shown that hybrid electrodes fabricated using laser processing technology exhibit excellent performance in electrochemical capacitor applications, significantly increasing the capacitance of the electrodes. In addition, asymmetric aqueous and solid-state ECs display excellent stability over tens of thousands of charge-discharge cycles. Building electrodes composed of graphene nanowalls and transition metal oxide, with the laser-induced crystallization and coating of metal oxide nanostructures on the surface of graphene nanowalls, has been proven to be an effective and feasible method.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Correction
Nanoscience & Nanotechnology
Yasmin Esqueda-Barron, Angel Perez del Pino, Pablo Garcia Lebiere, Arevik Musheghyan-Avetisyan, Enric Bertran-Serra, Eniko Gyorgy, Constantin Logofatu
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Geochemistry & Geophysics
Konstantinos Kollias, Athanasios Godelitsas, Jose Manuel Astilleros, Spyridon Ladas, Anastasios Lagoyannis, Thomas Mavromoustakos
Summary: The study investigated the interaction of aluminosilicate/silicate and carbonate materials with natural Acid Mine Drainage (AMD) to understand the chemical processes at the interface. The results showed that carbonates are more effective in neutralizing AMD due to better metal removal, whereas aluminosilicate/silicates are more resistant but have lower metal removal rates. Changes in surface topography on zeolite and calcite crystals were observed, suggesting simultaneous dissolution and sorption phenomena. Proposed models in nano(molecular)-scale can explain the interaction of AMD with mineral surfaces.
APPLIED GEOCHEMISTRY
(2021)
Article
Physics, Multidisciplinary
S. Harissopulos, M. Andrianis, M. Axiotis, A. Lagoyannis, A. G. Karydas, Z. Kotsina, A. Laoutaris, G. Apostolopoulos, A. Theodorou, T. J. M. Zouros, I Madesis, E. P. Benis
Summary: The Tandem Accelerator Laboratory of NCSR Demokritos in Athens, Greece, provides a technical description of the laboratory, installed setups, currently implemented upgrades, and associated funded projects. Highlights, future upgrade plans, and access possibilities for external users are also presented.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Materials Science, Ceramics
Pablo Garcia Lebiere, Eniko Gyorgy, Constantin Logofatu, Denys Naumenko, Heinz Amenitsch, Piu Rajak, Regina Ciancio, Angel Perez del Pino
Summary: Understanding the charge storage mechanisms in complex composite electrodes is crucial for the development of advanced electrochemical capacitors. By nitrogen functionalization, the structural configuration of the composite electrodes changed significantly, leading to enhanced capacitance. The composite electrodes prepared with urea precursor exhibited the highest capacitance, which was attributed to the presence of pyridinic nitrogen.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Fluids & Plasmas
P. Tsavalas, A. Lagoyannis, K. Mergia, M. Axiotis, S. Harissopulos, G. Provatas, S. Fazinic, T. Tadic, A. Widdowson, M. Rubel
Summary: This study analyzed castellated beryllium marker tiles from different locations in the JET tokamak and found that the amounts of carbon and deuterium deposition and retention on the castellation sides decrease with depth from the plasma-facing surface. There is no systematic difference between the deposition and retention on different castellation sides with respect to the ion/electron drift direction. The carbon and deuterium content is generally lower on the plasma-facing surface compared to the surfaces in the gaps of the castellation.
Article
Chemistry, Physical
Enric Bertran-Serra, Arevik Musheghyan-Avetisyan, Stefanos Chaitoglou, Roger Amade-Rovira, Islam Alshaikh, Fernando Pantoja-Suarez, Jose-Luis Andujar-Bella, Tariq Jawhari, Angel Perez-del-Pino, Eniko Gyorgy
Summary: It is possible to grow flat graphene nanostructures from gas phase on planar substrates. Vertical graphene nanowalls can achieve a large specific surface area and exhibit high vertical and in-plane electrical conductivity, suitable for electrochemical applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Ceramics
Carmen Mita, Nicoleta Cornei, Georgiana Bulai, Marius Dobromir, Mihaela Girtan, Alexander Doroshkevich, Eniko Gyorgy, Diana Mardare
Summary: In this paper, the photocatalytic properties of SmFe0.7Co0.3O3 and Sm0.7Sr0.3Fe0.7Co0.3O3 thin films for rhodamine B degradation were compared in the absence and presence of hydrogen peroxide. The effects of Sr doping on film properties were investigated using various techniques. The presence of Sr atoms in the film resulted in increased photocatalytic efficiency, increased oxygen vacancies, and reduction of Fe4+ to Fe3+ and Fe2+. In the presence of co-catalyst, the degradation efficiency reached 100% after 120 min for the doped film and 150 min for the undoped film.
CERAMICS INTERNATIONAL
(2023)
Article
Instruments & Instrumentation
M. Kokkoris, K. Bosmpotinis, V. Foteinou, A. F. Gurbich, A. Lagoyannis, F. Maragkos, N. Patronis, E. Taimpiri, A. Ziagkova
Summary: In this study, the experimental differential cross sections of O-nat(p,p0) elastic scattering were measured in the proton beam energy range of 4-6 MeV using the relative measurement technique. The measurements were conducted at six backscattering detector angles and a thin, selfsupporting target was used. The theoretical calculations also support the obtained results and show good agreement with existing literature data.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2023)
Article
Multidisciplinary Sciences
R. Ivan, C. Popescu, V. A. Antohe, S. Antohe, C. Negrila, C. Logofatu, A. Perez del Pino, E. Gyorgy
Summary: Hybrid layers composed of Fe oxide, Fe hydroxide, and nitrogen doped graphene-like platelets were synthesized using an eco-friendly laser-based method for photocatalytic applications. The complex composite layers exhibited high photodecomposition efficiency in degrading antibiotic molecules under visible light irradiation. The efficiency was affected by the relative concentrations of base materials and the photodecomposition mechanism was primarily attributed to synergistic effects between the constituent materials, efficient electron-hole pair separation, and the presence of conducting graphene-like platelets.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Nuclear
E. Georgali, N. Patronis, A. Anastasiadis, X. Aslanoglou, M. Axiotis, S. Chasapoglou, Z. Eleme, S. Harissopulos, A. Kalamara, M. Kokkoris, A. Lagoyannis, E. Mitsi, M. Savva, I. E. Stamatelatos, T. Vasilopoulou, R. Vlastou
Summary: In this study, the cross section of the 156Dy (n, 2n) 155Dy reaction was measured at neutron beam energies above 17 MeV, specifically at 17.1, 18.1, and 19.0 MeV. The experimental measurements were complemented by theoretical calculations performed using the TALYS code version 1.95.
Article
Physics, Nuclear
S. Harissopulos, E. Vagena, P. Dimitriou, M. Axiotis, S. Galanopoulos, V Foteinou, A. Lagoyannis
Summary: This study systematically investigates proton capture reactions on Sr isotopes to validate different models of OMP, NLD, and gamma SF through extensive comparisons between HF calculations and experimental data. The experimental results match well with the default models in the TALYS 1.95 code, highlighting the importance of continued efforts in studying proton-capture reactions to improve global nuclear models.
Article
Chemistry, Physical
Pablo Garcia Lebiere, Angel Perez del Pino, Guillem Domenech Domingo, Constantin Logofatu, Immaculada Martinez-Rovira, Ibraheem Yousef, Eniko Gyorgy
Summary: The research focuses on investigating novel composite materials to improve the energy storage performance of electrochemical capacitors. By combining different types of materials, synergistic effects are crucial for enhancing performance. Through RIMAPLE technique, electrodes composed of a mixture of carbon nanoentities, graphene oxide, cerium, and manganese oxides were fabricated, showing excellent performance and stability in symmetric electrochemical capacitors.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
