Article
Materials Science, Ceramics
Woochan Jin, Kyounghee Park, Jun Young Cho, Sung-Hwan Bae, Muhammad Siyar, Chan Park
Summary: A smart window based on VO2 is a promising thermochromic glass that can regulate heat flow through windows by solar modulation near room temperature. It requires TC glass with high visible-light transmittance and large difference in infrared transmittance between high- and low-temperature VO2 phases to save energy.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Coatings & Films
Camille Pallier, Philippe Djemia, Daniele Fournier, Laurent Belliard, Jun Lu, Fredrik Eriksson, Per Eklund, Grzegorz Greczynski, Arnaud le Febvrier
Summary: Cr-N based materials are commonly used as hard and corrosion-resistant coatings. In this study, low nitrogen containing Cr thin films were deposited by high ion assisted magnetron sputtering. The films exhibited a multiphase nanostructure, resulting in a hardening effect. The mechanical properties of the films were affected by residual stress, h-Cr2N1-delta phase content, and nanostructuring.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Coatings & Films
Camille Pallier, Philippe Djemia, Daniele Fournier, Laurent Belliard, Jun Lu, Fredrik Eriksson, Per Eklund, Grzegorz Greczynski, Arnaud le Febvrier
Summary: Low nitrogen containing Cr thin films deposited by high ion assisted magnetron sputtering were studied, revealing a hardening effect due to the multiphase nanostructure. The mechanical properties of these films depend on residual stress and nanostructuring nature, with a maximum hardness of 37 GPa achieved.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Chemistry, Physical
Ning Zhang, Yongsheng Wang, Zihao Chen, Bin Zhou, Jie Gao, Yanxia Wu, Yong Ma, Hongjun Hei, Shengwang Yu
Summary: The quality of β-Ga2O3 films with top layer doping of nitrogen was found to be related to the N content and annealing atmosphere, leading to high transmittance and ultraviolet emission properties.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
M. Nyborg, K. Karlsen, K. Bergum, E. Monakhov
Summary: The relationship between Li concentration and the electrical properties of Cu2O was investigated, revealing that higher Li concentrations lead to an increase in hole concentration and a decrease in the activation energy for the dominant acceptors in Cu2O.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Materials Science, Multidisciplinary
Justin Ryan Phelps, Ashwin Kumar Saikumar, Reza Abdolvand, Kalpathy B. B. Sundaram
Summary: This study reports the material properties of gallium-doped zinc oxide grown from a high impulse magnetron sputtering system (HiPIMS) and compares them to those of radio frequency (RF) sputtering deposition. The results show that HiPIMS and RF processes yield similar outcomes under the same average power conditions. RF depositions exhibit slightly higher band gap and deposition rate, as well as lower resistivity and optical absorption coefficient. Both methods show that band gaps and grain size increase with deposition power.
Article
Chemistry, Analytical
Aoyun Zhuang, Ke Wu, Yao Lu, Jianping Yu
Summary: This study prepared superhydrophobic ZnO/PTFE films on glass substrates by RF magnetron sputtering, exhibiting high water droplet contact angle of 165° and sliding angle of less than 1°. The PTFE coating provided excellent UV resistance compared to HDTMS hydrophobic agents, and the ZnO/PTFE films showed better photocatalytic property and mechanical robustness.
Article
Materials Science, Multidisciplinary
Tomasz Moscicki, Justyna Chrzanowska-Gizynska, Rafal Psiuk, Piotr Denis, K. Mulewska, Lukasz Kurpaska, Marcin Chmielewski, Maria Wisniewska, Dariusz Garbiec
Summary: Magnetron sputtered WB2 coatings with different amounts of zirconium (8, 11, and 16 at.%) were analyzed, and it was found that the coatings had alpha-AlB2 and omega-W2B5 prototype structures. The proportion of omega-W2B5 phase increased with the increase in zirconium content. The hardness of all the coatings was around 45 GPa, while the Young's modulus slightly decreased with the increase in zirconium content. Furthermore, it was observed that the addition of zirconium improved the phase stability of the coatings.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Chemistry, Physical
Florian Bocchese, David Cornil, Emile Haye, Jerome Cornil, Stephane Lucas
Summary: This study investigates the structural, morphological, and optical properties of TAZO films deposited by reactive magnetron using experiments and Density Functional Theory (DFT) simulations. The results show that TiO2 units substitute Zn atoms in the ZnO structure and the formation of Al2O3 occurs. A three-regime model is proposed to explain the evolution of properties at different Ti contents.
SURFACES AND INTERFACES
(2022)
Article
Physics, Multidisciplinary
Cristian L. Teran, Jorge A. Calderon, Heiddy P. Quiroz, A. Dussan
Summary: This study investigates the resistive switching behavior of ZnO thin films deposited via DC magnetron sputtering. The research explores the structural and optical properties of the films, as well as the changes in transport mechanism due to high defect concentration in the samples. The correlation between synthesis parameters, structural characterization, and shape of bipolar switching effect is analyzed, providing insights into the fabrication and control of resistive random access memories.
CHINESE JOURNAL OF PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Giovanni Morello, Stefania Milanese, Maria Luisa De Giorgi, Nicola Calisi, Stefano Caporali, Francesco Biccari, Naomi Falsini, Anna Vinattieri, Marco Anni
Summary: Halide perovskites are recognized as real contenders for the next generation of optoelectronic devices due to their high optical efficiency, low-cost fabrication, and wide variety in composition and bandgap. This study reports the amplified spontaneous emission (ASE) properties of CsPbBr3 films obtained through RF-magnetron sputtering. The films exhibited ASE over a broad temperature range, with the best performance occurring at around 50 K. The results indicate the potential for large-area, high-quality perovskite thin films for optoelectronic applications.
Article
Materials Science, Multidisciplinary
Simindokht Khademjafari, Sayed Mahmood Rabiee, Salman Nourouzi, Reza Shabannia Rami
Summary: RF magnetron sputtering was used to deposit ZnO nanoparticles on hydroxyapatite tablets in this study, resulting in improved bioactivity and ion release. Various analyses including FE-SEM, EDS, MAP, AFM, XRD, antibacterial assay, AAS, and flame photometer were conducted to confirm the successful coating and enhanced performance of the ZnO-coated tablets. The results showed that the ZnO coating led to decreased surface roughness, higher bioactivity against E. coli, and increased release of Zn2+ and Ca2+ ions.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Li-Ping Peng, A-Ling He, Liang Fang, Xiao-Fei Yang
Summary: High conductive and transparent indium-doped zinc oxide (IZO) thin films were successfully deposited on glass substrates using radio-frequency magnetron sputtering at low temperature. The influence of deposition pressure on the properties of the films was significant, and the film deposited at 2.0 Pa showed the best performance.
Article
Chemistry, Physical
N. Jalalian Karazmoudeh, M. Soltanieh, M. Hasheminiasari
Summary: Undoped and Zn-doped CuO thin films were successfully fabricated by reactive magnetron sputtering. The effect of Zn dopant concentration on the photocatalytic behavior and structural properties of CuO thin films was investigated. Optimal conditions for CuO deposition and Zn doping were determined to achieve high photocatalytic degradation efficiency of methylene blue.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Multidisciplinary
Devendra Kumar, Chiranji Lal, Dharm Veer, Deshraj Singh, Pawan Kumar, Ram S. Katiyar
Summary: CdSe and CdSe:Te thin films were grown on glass substrates by RF magnetron sputtering. The doping percentage of Tellurium (Te) in CdSe was 7% for the CdSe:Te thin film. The microscopic images of the films were found to be uniform and homogeneous in nature with a uniform grain and no cracks, and the grain size of CdSe was higher than CdSe:Te thin film. CdSe:Te thin film shows a higher absorption coefficient compared to CdSe in the visible region. The Energy band gaps were found to be 2.01 and 1.73 eV for CdSe and CdSe:Te thin films, respectively. The incorporation of Te atom into the CdSe structure has enhanced the mobility and changed the type of conductivity from n-type to p-type.
Article
Chemistry, Analytical
N. Pessoa Barradas, N. Farjallah, A. Vieira, M. Blaauw
Summary: This article explores the potential of artificial intelligence methods for data analysis in neutron activation analysis (NAA). Using data augmentation techniques and optimized architecture, an efficient artificial neural network (ANN) was developed to analyze NAA data of simple problems. The results are presented, and the extension of this work to more challenging NAA problems is discussed.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Diana Gaspar, Jorge Martins, Jose Tiago Carvalho, Paul Grey, Rogerio Simoes, Elvira Fortunato, Rodrigo Martins, Luis Pereira
Summary: The market for flexible, hybrid, and printed electronic systems is uncertain, but these systems are emerging daily, allowing for devices and systems that can be folded and stored in pockets. Cellulose-based modified nanopapers were developed as a physical support and gate dielectric layer for recyclable field-effect transistors (FETs). Impregnation of the nanopapers with sodium ions enabled low voltage FETs (<3 V), with high mobility (>10 cm2 V-1 s-1), current modulation (>105), and improved dynamic response. These transistors were successfully implemented into simple circuits such as inverters, showing clear discrimination between logic states. Besides improved electrical performance, these devices are a promising alternative for reliable, sustainable, and flexible electronics, even under stress conditions.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Energy & Fuels
Paulo Joaquim Nunes, Rui Francisco Pinto Pereira, Sonia Pereira, Maria Manuela Silva, Elvira Fortunato, Veronica de Zea Bermudez, Mariana Fernandes
Summary: Two di-ureasils with oxyethylene segments were prepared by the sol-gel method, doped with ionic liquid and lithium salt. The resulting films were translucent, flexible, hydrophobic, and had low surface roughness. The optimized sample exhibited good ionic conductivity and was used in prototype electrochromic devices with promising performance.
Review
Medicine, General & Internal
Maria Joao Meneses, Rita Susana Patarrao, Tomas Pinheiro, Ines Coelho, Nuno Carrico, Ana Carolina Marques, Artur Romao, Joao Nabais, Elvira Fortunato, Joao Filipe Raposo, Maria Paula Macedo
Summary: Diabetes is a heterogeneous and multifactorial disease, and besides glycemia and glycated hemoglobin, the evaluation of other biochemical parameters is necessary for better diagnosis and management. Indexes of insulin secretion, sensitivity/resistance, and metabolism have been developed to provide a more comprehensive view of individual metabolic states. New technologies, such as sensors and software applications, have the potential to improve diabetes diagnosis and management, empowering patients and simplifying disease management.
EUROPEAN JOURNAL OF CLINICAL INVESTIGATION
(2023)
Article
Nanoscience & Nanotechnology
Bo He, Gang He, Shanshan Jiang, Jiangwei Liu, Elvira Fortunato, Rodrigo Martins
Summary: Thin-film transistors based on metal oxide semiconductors are widely used in driving low-cost backplanes of active matrix liquid crystal displays. Solution-based 1D nanofiber networks have been proven to be a simpler and higher-throughput approach for transistor fabrication. Double channel heterojunction transistors composed of In2O3 and ZnO layers show high electron mobility and operational stability, which can be optimized by adjusting the stacking order and density of the layers.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Biochemistry & Molecular Biology
Ana Sofia Figueiredo, Ana Maria Ferraria, Ana Maria Botelho do Rego, Silvia Monteiro, Ricardo Santos, Miguel Minhalma, Maria Guadalupe Sanchez-Loredo, Rosa Lina Tovar-Tovar, Maria Norberta de Pinho
Summary: The antibacterial properties of cellulose acetate/silver nanoparticles (AgNP) ultrafiltration membranes were studied and the results showed that the distinct features of each side of the membranes, the active and porous layers surfaces, played a role in the antibacterial activity. The composition and structure of the membranes affected the accessibility of the silver to Escherichia coli (E. coli), leading to different levels of growth inhibition. The findings suggest that the membrane design and silver distribution can be optimized to enhance the antibacterial performance.
Article
Biochemistry & Molecular Biology
Rita F. Nunes, Daniel Costa, Ana M. Ferraria, Ana Botelho M. do Rego, Filipa Ribeiro, Angela Martins, Auguste Fernandes
Summary: Due to the need to reduce global CO2 emissions, bio-based fuels are being explored. To reduce oxygen content, bio-oils need to be upgraded through catalytic hydrodeoxygenation (HDO) using bifunctional catalysts with metal and acid sites. Pt-Al2O3 and Ni-Al2O3 catalysts containing heteropolyacids (HPA) were prepared, and their properties were characterized. Ni-based catalysts showed higher conversion and selectivity to deoxygenated compounds, making them the most promising, despite suffering from deactivation over time.
Article
Physics, Multidisciplinary
C. M. Vitor, E. Alves, R. C. da Silva, R. Mateus, J. Cruz, N. Catarino
Summary: In this study, ion beam analysis techniques were used to investigate the Be-related plasma-wall interactions. New data sets for the differential cross sections Be-9(He-3,p( i ))B-11 were obtained, and the results were found to be consistent with previous studies. A benchmarking measurement was performed to validate the results.
Article
Chemistry, Analytical
Beatriz J. Coelho, Joana P. Neto, Barbara Sieira, Andre T. Moura, Elvira Fortunato, Rodrigo Martins, Pedro V. Baptista, Rui Igreja, Hugo Aguas
Summary: Microfluidic-based platforms are powerful tools for chemical and biological assays. The fusion of different microfluidic technologies has the potential to overcome limitations and enhance their strengths.
Article
Polymer Science
Beatriz J. Coelho, Joana V. Pinto, Jorge Martins, Ana Rovisco, Pedro Barquinha, Elvira Fortunato, Pedro V. Baptista, Rodrigo Martins, Rui Igreja
Summary: Poly(p-xylylene) derivatives, also known as Parylenes, have been extensively studied for their thermal, structural, and electrical properties. This article explores the application of Parylene C in various electronic devices, including transistors, capacitors, and digital microfluidic devices. The results show that Parylene C can be used as a dielectric, substrate, and encapsulation layer in transistors, producing high performance devices with steep transfer curves, low gate leak currents, and good mobilities. The study also demonstrates the functionality of Parylene C in MIM structures and its capability to enable faster droplet motion and nucleic acid amplification reactions in DMF devices.
Article
Nuclear Science & Technology
Y. Zayachuk, N. Catarino, C. Smith, I. Jepu, C. Ayres, A. Widdowson, E. Alves, M. Rubel, JET Contributors
Summary: In this study, beryllium samples with co-deposits or surface cracks caused by melt damage were immersed into boiling water to simulate the impact of coolant water ingress into a tokamak. The results showed that there was no thermomechanical damage to the samples during exposure, and no measurable release of deuterium occurred. Only some degree of surface oxidation was observed, but no thick oxide films were formed.
NUCLEAR MATERIALS AND ENERGY
(2023)
Article
Materials Science, Multidisciplinary
J. Figueira, R. M. Bonito, J. T. Carvalho, E. M. F. Vieira, C. Gaspar, Joana Loureiro, J. H. Correia, E. Fortunato, R. Martins, L. Pereira
Summary: Flexible thermal touch sensors were produced by optimizing ethyl cellulose and graphite flakes inks for screen-printing. The best electrical-TE output combination was achieved by printing two layers of the ink with 20 wt% of graphite on an office paper substrate. The results showed that the screen-printed graphite-based inks are highly suitable for flexible TE sensing applications.
FLEXIBLE AND PRINTED ELECTRONICS
(2023)
Article
Biochemistry & Molecular Biology
Nenad Bundaleski, Carolina F. Adame, Eduardo Alves, Nuno P. Barradas, Maria F. Cerqueira, Jonas Deuermeier, Yorick Delaup, Ana M. Ferraria, Isabel M. M. Ferreira, Holger Neupert, Marcel Himmerlich, Ana Maria M. B. do Rego, Martino Rimoldi, Orlando M. N. D. Teodoro, Mikhail Vasilevskiy, Pedro Costa Pinto
Summary: There has been growing interest in using amorphous carbon thin films with low secondary electron yield (SEY) to reduce electron multipacting in particle accelerators and RF devices. Previous studies have shown that the SEY increases with the amount of hydrogen and is correlated with the Tauc gap. In this study, films produced by magnetron sputtering with varying amounts of hydrogen and deuterium were analyzed, and it was found that the maximal SEY decreases with the fraction of the graphitic phase in the films.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Review
Engineering, Electrical & Electronic
Maria Elias Pereira, Rodrigo Martins, Elvira Fortunato, Pedro Barquinha, Asal Kiazadeh
Summary: Neuromorphic computing is gaining popularity as a replacement for outdated technology in conventional computing systems. Artificial neural networks composed of memristor crossbars in hardware offer power, cost, and area-efficient in-memory computing and storage. Optoelectronic memristors (OEMs) can control resistive switching (RS) through both optical and electronic signals, solving crosstalk issues and providing a high-speed non-destructive method. This review summarizes recent advances in inorganic OEMs, analyzing the device structure and assessing their potential applications in logic gates, artificial neural networks, and artificial visual systems with consideration for their performance.
NEUROMORPHIC COMPUTING AND ENGINEERING
(2023)
Article
Chemistry, Analytical
Maria Joao Oliveira, Soraia Caetano, Ana Dalot, Filipe Sabino, Tomas R. Calmeiro, Elvira Fortunato, Rodrigo Martins, Eulalia Pereira, Miguel Prudencio, Hugh J. Byrne, Ricardo Franco, Hugo Aguas
Summary: Early and accurate detection of pathogenic microorganisms is crucial for diagnosis and patient outcomes. The combination of a polystyrene-based microfluidic device and Surface-Enhanced Raman Spectroscopy shows excellent sensitivity and specificity in detecting malaria. The system can be easily adapted for other pathogens and has the potential for early diagnosis of infectious diseases.
