Article
Polymer Science
Valentina Grumezescu, Alexandru Mihai Grumezescu, Anton Ficai, Irina Negut, Bogdan Stefan Vasile, Bianca Galateanu, Ariana Hudita
Summary: This article presents the preparation and characterization of composite coatings based on hydroxyapatite (HAp), chitosan (CS), and FGF2, and investigates their effects on attachment, growth, and differentiation of cells through in vitro experiments. The results suggest that these coatings are suitable for bone tissue engineering applications.
Article
Polymer Science
Maria Elena Zarif, Sasa Alexandra Yehia-Alexe, Bogdan Bita, Irina Negut, Claudiu Locovei, Andreea Groza
Summary: In this study, calcium phosphate-chitosan composite layers were synthesized, and the effect of substrate temperature on the incorporation of chitosan was investigated. The degree of chitosan incorporation significantly influenced the properties and adherence strength of the composite layers. The adherence strength was diminished after chitosan deposition.
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
Automation & Control Systems
Yunze Li, Dongzhe Zhang, Zhipeng Ye, Gaihua Ye, Rui He, Hui Wang, Weilong Cong
Summary: This study investigates the application and reinforcement mechanisms of carbon-based nanomaterials in metal matrix and ceramic matrix composites. GO-Ti and GO-ZTA parts were fabricated using a laser DED process, and the forms of GO in the fabricated composites were analyzed using Raman spectrum, XRD analysis, and EDS analysis. The study also examines the effects of GO on the microhardness and compressive properties of the composites.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Lenka Volfova, Stefan Andrei Irimiciuc, Sergii Chertopalov, Petr Hruska, Jakub Cizek, Martin Vondracek, Michal Novotny, Maik Butterling, Maciej Oskar Liedke, Andreas Wagner, Jan Lancok
Summary: The influence of oxygen pressure on the structural and physical properties of various copper oxide phases grown by Pulsed Laser Deposition (PLD) on MgO (100) was investigated. Positron annihilation spectroscopy revealed the presence of positrons trapped at vacancies and large vacancy clusters with lifetimes ranging from 400 ps to 500 ps. Single copper vacancies were found in the CuO phase, while copper vacancy complexes coupled with oxygen vacancies were observed in the Cu2O phase. Suitable O-2 atmosphere conditions that induced a mixture of copper oxide phases were identified. In situ diagnostic techniques based on Optical Emission Spectroscopy and Langmuir Probe were used to monitor the deposition process and correlate with film properties.
APPLIED SURFACE SCIENCE
(2023)
Article
Crystallography
Yuxuan Wang, Bin Zou, Bruno Rente, Neil Alford, Peter K. Petrov
Summary: In this study, multilayer graphene thin films (MLG) were grown without a catalyst on Si/SiO2 using pulsed laser deposition (PLD). It was found that 500 laser pulses were required to produce fully covered samples, which contained approximately 5 layers of graphene. The number of layers was not affected by the laser fluence and the sample cooling rate, but increasing the laser fluence resulted in a reduction in MLG resistance. PLD method is suitable for producing nanocrystalline MLG with similar electrical conductivity as commercial CVD graphene.
Article
Chemistry, Physical
Tianqi Wang, Qingshi Meng, Sherif Araby, Guang Yang, Pengxu Li, Rui Cai, Sensen Han, Wei Wang
Summary: This study presents a fast and reliable approach to prepare graphene-based aluminum nanocomposites with high mechanical strength, ductility, and thermal conductivity using laser deposition manufacturing. 3D printed Al-alloy/graphene nanocomposites exhibited significant improvements in mechanical properties compared to pure aluminum alloy, showing potential for various applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Jianguo Zhang, Wei Wang, Simiao Wu, Zhiming Geng, Jinfu Zhang, Li Chen, Ningtao Liu, Xuejun Yan, Wenrui Zhang, Jichun Ye
Summary: This study reports the controlled growth of metastable gallium oxide films by pulsed laser deposition (PLD) and explores a comprehensive phase evolution picture tuned by synthesis parameters, substrate orientations, and Sn dopants. The stabilization of both undoped and Sn-doped α-Ga2O3 films on a-plane sapphire substrates is demonstrated, and Sn dopants can broaden the growth window of α-Ga2O3. Sn-doped ε-Ga2O3 is more favored than β-Ga2O3 to be stabilized on c-plane substrates, and oxygen pressure is critical for ε-Ga2O3 formation. The structural impact on thermal transport among these metastable Ga2O3 films is investigated, showing different thermal conductivities. This study provides a synthesis guideline for metastable Ga2O3 polymorphs and insights into selective phase stabilization of transition metal oxides.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Dominik Maskowicz, Rafal Jendrzejewski, Wioletta Kopec, Maria Gazda, Jakub Karczewski, Pawel Niedzialkowski, Armin Kleibert, Carlos A. F. Vaz, Yann Garcia, Miroslaw Sawczak
Summary: This study successfully prepared uniform and functional thin films of Fe(pz)Pt[CN](4) nanoparticles on Si and/or glass substrates using a tunable pulsed laser. Temperature-dependent Raman and UV-Vis spectroscopy confirmed the spin transition in the temperature range of 275 to 290 K.
Article
Energy & Fuels
Jie Miao, Fengyong Lv, Raza Gulfam, Weiping Zhao
Summary: In this study, an innovative solar vapor generator consisting of copper foam and graphene oxide has been manufactured by simple chemical oxidation and physical precipitation. The micro/nanostructure and superhydrophilic properties of the material contribute to the enhancement of solar evaporation efficiency.
Article
Chemistry, Multidisciplinary
Luminita Nicoleta Dumitrescu, Eusebiu-Rosini Ionita, Ruxandra Birjega, Andrada Lazea-Stoyanova, Maria-Daniela Ionita, George Epurescu, Ana-Maria Banici, Simona Brajnicov, Florin Andrei, Andreea Matei
Summary: This study presents the deposition of thin films of lamellar clays using laser techniques, focusing on the optimization of deposition parameters to achieve highly oriented crystalline films. The films were characterized using various techniques and different wetting properties were achieved by adjusting the deposition techniques and parameters.
Article
Materials Science, Multidisciplinary
Xing-Nan Hao, Xia Liu
Summary: In this study, the sintering behavior of graphene/aluminum composites was investigated using MD simulations. The results showed that higher sintering temperature and smaller aluminum particle size contribute to improved sintering quality. Additionally, residual stresses predominantly occur at voids, microcracks, and Gr/Al interfaces.
Article
Chemistry, Multidisciplinary
Jan Plsek, Karolina Anna Drogowska-Horna, Valentino L. P. Guerra, Jiri Miksatko, Vaclav Vales, Martin Kalbac
Summary: Porous graphene decorated with catalytically active ceria nanoparticles was prepared using PLD on graphene produced through CVD, confirming the important role of graphene support in stabilizing reduced ceria nanoparticles and demonstrating enhanced dehydrogenation activity in graphene with ceria nanoparticles.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Materials Science, Ceramics
Alexander W. Auner, Mark A. Burton, Lauren A. Nagel, Jonathan C. Crowhurst, David G. Weisz, Kimberly B. Knight
Summary: Different cerium oxides can be formed in high-temperature laser experiments by varying the availability of oxygen and the use of different laser heating methods. X-ray diffraction and Raman spectroscopy suggest the formation of a low structural order Ce2O3/CeO2 mixed structure using pulsed laser ablation in a 1% O2 atmosphere. Crystalline A-type Ce2O3 is formed near the point of laser impingement when using continuous wave laser heating in a 1% O2 environment. The Raman spectrum of Ce218O3 is reported for the first time through experiments conducted with 18O2.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Huiming Guo, Xin Wang, Alexander D. Dupuy, Julie M. Schoenung, William J. Bowman
Summary: In this study, high-entropy oxide thin films were synthesized using pulsed laser deposition, and the effects of laser fluence on crystal structure and morphology were investigated. The results showed that increasing laser fluence promoted film crystallization and increased film thickness, while reducing the formation of undesirable droplets.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Chemistry, Physical
N. C. Zoita, M. Dinu, A. E. Kiss, C. Logofatu, M. Braic
Summary: The hybrid DCMS / HiPIMS method was found to improve the structural and electrical properties of TiC thin films compared to the films grown using R-DCMS, with the former exhibiting better resistivity values.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
M. Sima, E. Matei, E. Vasile, A. Sima, N. Preda, C. Logofatu
Summary: The research results show that hematite nanowires grown on FTO/TiO2 substrate exhibit higher stability, density, and length compared to those grown on FTO substrate. The film of hematite on FTO substrate also demonstrated good uniform coverage and thickness.
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)
Article
Multidisciplinary Sciences
Ana-Maria Bratu, Cristina Popa, Mihaela Bojan, Petre Catalin Logofatu, Mioara Petrus
Summary: This research focuses on the evolution of various apple varieties over time and their applications in quality storage maintenance. Two methods, laser photoacoustic spectroscopy and multispectral imaging, were used to evaluate long-stored apples for sorting and degradation assessment. Results showed that the ethylene content decreased and the ethanol content increased over time, reflecting a potential degradation of the apples. The non-invasive, real-time inspection methods can help identify the beginning of the degradation process, improving sorting capabilities and maintaining quality and storability.
SCIENTIFIC REPORTS
(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
Chemistry, Physical
M. Sima, E. Vasile, N. Preda, A. Sima, E. Matei, C. Logofatu
Summary: Ferroelectric alpha-Fe2O3/BaTiO3 photoanodes were prepared and the influence of ferroelectric polarization on their photoelectrochemical performance was investigated. Results showed that positive poling improved photocurrent density, and different directions of ferroelectric polarization had a significant impact on the performance. Electrochemical impedance spectroscopy measurements confirmed the effect of ferroelectric polarization on charge transfer kinetics.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(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)
Review
Thermodynamics
Rajesh Kumar, Angel Perez del Pino, Sumanta Sahoo, Rajesh Kumar Singh, Wai Kian Tan, Kamal K. Kar, Atsunori Matsuda, Ednan Joanni
Summary: This review summarizes recent studies on laser-assisted synthesis and modification of graphene-based materials, as well as their application as electrodes for supercapacitors and batteries. It provides an overview of the physical properties of graphene and different types of laser processing operations, with a detailed discussion on the practical uses of laser techniques for fabricating electrode materials.
PROGRESS IN ENERGY AND COMBUSTION SCIENCE
(2022)
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
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
Materials Science, Ceramics
Angel Perez del Pino, Pablo Garcia Lebiere, Alifhers Mestra, Eniko Gyorgy, Carlos Garcia Lopez, Wolfgang Bacsa, Constantin Logofatu
Summary: The development of new synthetic methods is crucial for the versatile production of complex multi-component electrodes for supercapacitors. The reactive inverse matrix assisted pulsed laser evaporation (RIMAPLE) technique has potential in depositing complex functional nanocomposites in a simple way. This study successfully obtained hybrid supercapacitor electrodes composed of reduced graphene oxide (rGO) and carbon nanotubes (CNTs) decorated with a variety of cerium and manganese oxide nanoparticles using RIMAPLE targets. The post-annealing treatments led to a further reduction of rGO and CNTs, as well as changes in the oxidation states of the Ce and Mn oxides, resulting in a significant increase in electrode capacitance.
CERAMICS INTERNATIONAL
(2023)
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)