Article
Energy & Fuels
Fahad Alnjiman, Agathe Virfeu, David Pilloud, Sebastien Diliberto, Emile Haye, Alaa E. Giba, Sylvie Migot, Jaafar Ghanbaja, Pascal Boulet, Hamad Albrithen, Jean Francois Pierson
Summary: MgSnN2 thin films were deposited on fused silica and silicon substrates by reactive magnetron co-sputtering. The properties of the films were studied as a function of deposition temperature. The films exhibited a wurtzite-like structure with a strong preferred orientation along the [002] direction. The electron mobility increased at high deposition temperature, and the optical band gap of the films also increased.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Chemistry, Multidisciplinary
Ahmad M. M. Alsaad, Qais M. M. Al-Bataineh, Issam A. A. Qattan, Ihsan A. A. Aljarrah, Areen A. A. Bani-Salameh, Ahmad A. A. Ahmad, Borhan A. A. Albiss, Ahmad Telfah, Renat F. F. Sabirianov
Summary: We fabricated and characterized ferroelectric films of the organic molecular diisopropylammonium chloride using various methods. Our findings suggest that these films could be a promising alternative to lead-based perovskites for various applications such as piezoelectric devices and optoelectronics.
Article
Chemistry, Physical
Cristiane B. Goncalves, Rafael T. da Silva, Gustavo Dalenogare, Isabelle M. D. Gonzaga, Lucia H. Mascaro, Mateus M. Ferrer, Marcelo Assis, Elson Longo, Hugo B. de Carvalho, Antonio C. Doriguetto
Summary: This study presents a comprehensive analysis of morphology, microstructure, and optical properties of electrodeposited Cu2O thin films on SnO2:F substrates. The films exhibited stability, purity, and crystallinity, with various morphologies and growth orientations. These findings make a significant contribution to the exploration of multifunctional semiconductor materials for various advanced technologies.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Physical
Astrid Ali, Eduardo Cisternas, Fernando Stavale, Emilia Annese
Summary: In this study, the electronic properties of a new cobalt doped Mn3O4 oxide surface were investigated using X-ray absorption and photoemission spectroscopy, as well as density functional theory calculations. The results showed that Co impurities preferentially adopted a 2+ oxidation state, replacing Mn2+ cations on tetrahedral sites and Mn3+ cations on octahedral sites. The formation of oxygen vacancies related to the formation of Co2+ in an octahedral site was directly observed. These Co dopant species could potentially affect the adsorption capability and electron transfer of the Mn3O4 surface, making it promising for catalytic applications.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Mohd. Shkir, Z. R. Khan, Abdullah S. Alshammari, M. Gandouzi, I. M. Ashraf, S. AlFaify
Summary: La@CdS nanostructured thin films were successfully fabricated on glass substrates with hexagonal wurtzite structure and demonstrated excellent opto-nonlinear and visible light photo-detection properties. The optical band gap values of the films ranged from 2.40 to 2.42 eV, while the third order nonlinear optical susceptibility values were remarkably enhanced after La doping.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Jie Zhang, Yuanyuan Zhang, Qianqian Chen, Xuefeng Chen, Genshui Wang, Xianlin Dong, Jing Yang, Wei Bai, Xiaodong Tang
Summary: The microstructures and physical properties of ferroelectric/antiferroelectric multilayer films were investigated, showing that the layer structure can tune electric field-dependent phase transitions and leakage current behaviors. The electric breakdown strength of PZT/PZO multilayer structure was enhanced, leading to a higher recoverable energy-storage density.
Article
Materials Science, Multidisciplinary
W. Belhadj, A. Timoumi, F. A. Alamer, O. H. Alsalmi, S. N. Alamri
Summary: Nanostructured TiO2-GO thin films were successfully synthesized using spin coating technique, exhibiting excellent structural, morphological, and optical properties with high transparency and smooth surfaces. Increasing spin coating speed was found to decrease film thickness and optical band gap, making TiO2-GO thin films promising candidates for transparent conducting oxide electrodes in solar cells.
RESULTS IN PHYSICS
(2021)
Article
Materials Science, Ceramics
Xiaokuo Er, Hongliang Wang, Pao-Wen Shao, Qinghua Ma, Ying-Hao Chu, Qian Zhan
Summary: The PbZr0.52Ti0.48O3 (PZT) tetragonal ferroelectric films fabricated on flexible mica and rigid silicon substrates via a low-cost sol-gel process showed differences in microstructure and properties. The PZT film on mica substrate demonstrated superior piezoelectric performance, attributed to the weak van der Waals interaction between the film and substrate.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Xinjie Wang, Yi-Chi Wang, Biaolin Peng, Jianyu Deng, Ya Yang, Wenhong Sun, Zhonglin Wang
Summary: This paper investigates the influence of thickness on the performance of ferroelectric thin films and reveals that thicker films enhance spontaneous polarization but decrease dielectric permittivity, coercivity field, residual polarization, efficiency, and energy density, and gradually transition the positive electrocaloric effect into a negative regime. These changes can be attributed to the variation of in-plane tensile stresses with thickness, resulting in an increase in the tetragonal phase and a decrease in the rhombohedral phase structure.
Article
Nanoscience & Nanotechnology
A. Berenov, P. Petrov, B. Moffat, J. Phair, L. Allers, R. W. Whatmore
Summary: This study investigated the properties of Nb-doped lead zirconate titanate films and found that Nb doping affects the orientation and ferroelectric response of the films, while also increasing the internal field and pyroelectric coefficient. Nb-doped films showed an increase in photocurrent, exhibiting a complex relationship between photovoltaic and pyroelectric effects.
Article
Engineering, Electrical & Electronic
Yudong Xu, Kunzhuang Hu, Min Shi, Ruzhong Zuo, Guannan Qiu, Zhuolin Si, Enyang Men
Summary: Lead-free films of Bi4-xNdxTi3O12 exhibit clear interfaces, blue and yellow light emission peaks, and varying properties such as band gaps, dielectric constant values, and dielectric loss with different concentrations of Nd3+. The films possess the minimum of band gap energy, minimal leakage current density, and maximal remanent polarization, showing promise for potential applications in multi-functional devices.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Reihane Ghomashi, Marzieh Rabiei, Shakila Ghomashi, Ahmad Reza Massah, Majid Kolahdoozan, Mozhgan Hosseinnezhad, Reza Ebrahimi-Kahrizsangi, Arvydas Palevicius, Sohrab Nasiri, Giedrius Janusas
Summary: In this study, four new low-emitting fluorescent dyes were designed and investigated. These dyes showed promising optical properties for use in dye sensitized solar cells, with the -NO2 substitution group having a significant effect on the performance of the dyes.
Article
Chemistry, Multidisciplinary
Anastasiia S. Kholtobina, Evgenia A. Kovaleva, Julia Melchakova, Sergey G. Ovchinnikov, Alexander A. Kuzubov
Summary: The atomic and electronic structure of vanadium phosphide thin films and their composites with zinc oxide substrate were modeled using quantum chemistry. A favored orientation between vanadium phosphide and ZnO was determined to be consistent across all structures. The electronic structure of the composites was detailed analyzed, including discussions on charge and spin density distribution features.
Article
Materials Science, Ceramics
U. C. Matur, I. P. Duru, D. Akcan
Summary: In this study, Mg-doped zinc oxide (MZO) thin films were deposited by sol-gel dip coating method to improve their physical properties. The structural and optical properties were investigated using XRD analysis, UV-VIS spectroscopy, and PL spectroscopy. The electronic properties were determined using the DFTB+ method. The experimental results were compared with theoretical calculations.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Multidisciplinary
Virendra Kumar, Anand Pandey, Lokendra Kumar, Manohar Singh, Ashwani Kumar, Shyam Kishor, Kalpna Jain, Khundrakpma Saratchandra Singh, Beer Pal Singh
Summary: In this study, the structural, morphological, and optical properties of pure and fullerene-doped perovskite thin films were investigated. The addition of fullerene resulted in larger grain size and a more compact surface. The perovskite thin films exhibited direct band-gap, making them suitable for solar cell applications.
Article
Materials Science, Multidisciplinary
K. M. Srinivasamurthy, A. El-Denglawey, K. Manjunatha, Jagadeesha Angadi, M. C. Oliveira, E. Longo, S. R. Lazaro, R. A. P. Ribeiro
Summary: This study investigated the structural, electronic, magnetic, and dielectric properties of novel ferrite (CNF) Co1-xNixFe2O4 (x = 0.0, 0.25, 0.5, 0.75, and 1.0) nanoparticles synthesized via a low-cost combustion synthesis technique. The results confirmed the formation of single-phase ferrite with a cubic spinel structure. The electrical properties exhibited dispersion behavior associated with interfacial polarization mechanism and charge carrier hopping. DFT calculations supported the experimental findings and indicated a ferrimagnetic ground state with increased band gap and decreased dielectric constant as the amount of Ni increased. The low dielectric loss of CNF with Ni2+ substitution at higher frequencies makes it a promising candidate for energy-harvesting devices in the electronics industry.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Biochemistry & Molecular Biology
Pedro Simao Sousa Mendonca, Jeziel Rodrigues dos Santos, Osmair Vital de Oliveira, Jose Divino dos Santos, Elson Longo
Summary: Computational chemistry methods were used to study the potential of a silicon nanotube as a virucidal agent against COVID-19. The results showed that the nanotube had high reactivity and favorable binding energy with the receptor-binding domain of the SARS-CoV-2 spike protein.
JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS
(2023)
Article
Engineering, Electrical & Electronic
Isabela C. F. Vaz, Carlos Eugenio Macchi, Alberto Somoza, Leandro S. R. Rocha, Elson Longo, Luis Cabral, Edison Z. da Silva, Alexandre Zirpoli Simoes, Giulia Zonta, Cesare Malagu, P. Mariela Desimone, Miguel Adolfo Ponce, Francisco Moura
Summary: This study explores the electrical properties of Nd-doped cerium oxide films synthesized using microwave assisted hydrothermal method. The increase in Nd content leads to structural disorder and the formation of defective clusters, which results in an increase in conductivity. The films demonstrate fast response time and show potential for gas sensor devices. Ab initio investigations reveal that oxygen vacancies play a fundamental role in enhancing the electrical conduction, mainly due to the presence of reduced Nd2+.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Thaiane Robeldo, Lucas S. Ribeiro, Lida Manrique, Andressa Mayumi Kubo, Elson Longo, Emerson Rodrigues Camargo, Ricardo Carneiro Borra
Summary: Low oxygen concentration in the tumor microenvironment is a major obstacle for photodynamic therapy of malignant tumors. Titanium dioxide (Ti(OH)(4)) shows potential as a photosensitizer for bladder cancer treatment due to its ability to produce high levels of reactive oxygen species (ROS) regardless of oxygen concentrations. In this study, exposure of Ti(OH)(4) to visible light stimulated ROS production and dose-dependently induced necrosis in tumor cells. Ti(OH)(4) also inhibited cell proliferation and migration in low concentrations. Mechanistically, Ti(OH)(4) may initiate type II cell death through autophagic dysfunction mechanisms associated with high ROS production.
Article
Materials Science, Multidisciplinary
Samantha Custodio Silva Lemos, Thais Karine de Lima Rezende, Marcelo Assis, Fernanda da Costa Romeiro, Diego Alves Peixoto, Eduardo de Oliveira Gomes, Gabriel Marques Jacobsen, Marcio Daldin Teodoro, Lourdes Gracia, Jefferson Luis Ferrari, Elson Longo, Juan Andres, Renata Cristina de Lima
Summary: Zn1-xNixO and Zn1-xFexO structures synthesized by the microwave-assisted hydrothermal method showed the best photocatalytic degradation performance for RhB and 4-NP. The specific dopant positions significantly influenced the separation and transport of electron-hole pairs. Morphological analysis revealed that the incorporation of dopant ions not only inhibited particle growth but also triggered a nucleation process, leading to morphology changes.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Nanoscience & Nanotechnology
Marisa Carvalho de Oliveira, Marcelo Assis, Luiz Gustavo Pagotto Simoes, Daniel Tamassia Minozzi, Renan A. . P. Ribeiro, Juan Andres, Elson Longo
Summary: This research reveals the biocidal activity of SiO2-Ag composites, which can eliminate Staphylococcus aureus and SARS-CoV-2 virus in just 2 minutes. The material destroys the virus structure by generating reactive oxygen species, as predicted by first-principles calculations.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Electrical & Electronic
Joao Paulo de Campos da Costa, Leonelio Cichetto Junior, Estacio Paiva de Araujo, Adryelle do Nascimento Arantes, Elson Longo, Adenilson Jose Chiquito, Joao Paulo Carmo
Summary: This article presents the development of a VOC gas sensor based on a PCB multiplexed IDE sensor, highlighting the use of graphite as a sensing material and describing the design and manufacturing of the sensors. Acetone exhibited the highest detection sensitivity, and the sensors maintained stability and repeatability after six months of evaluation.
IEEE SENSORS JOURNAL
(2022)
Article
Chemistry, Physical
Laura O. Libero, Lara K. Ribeiro, Luis I. Granone, Maria S. Churio, Josiane C. Souza, Valmor R. Mastelaro, Juan Andres, Elson Longo, Lucia H. Mascaro, Marcelo Assis
Summary: This study reports on the immobilization of Fe-2(MoO4)(3) in chitosan films and its effect on the oxidation reaction of sulfide derivatives. The catalyst showed good yields and excellent selectivity, even tolerating oxidatively sensitive functional groups. The key success of the selective oxidation was attributed to the presence of hydroxyl radical, center dot OH, and the Fe3+/Fe2+ Fenton-like process. Additionally, the synergistic effect between Fe-2(MoO4)(3) and chitosan was demonstrated in the selective oxidation of sulfides to sulfones. This work provides a design strategy for efficient catalysts that can be applied to other semiconductors and oxidation processes.
Article
Chemistry, Multidisciplinary
Amanda F. Gouveia, Samantha C. S. Lemos, Edson R. R. Leite, Elson Longo, Juan Andres
Summary: In this article, a simple computational model was developed using density functional theory calculations of ZnO surface energies and the Wulff construction to predict available morphologies and guide the search for field-emission scanning electron microscopy images. This model allows for understanding the routes of morphological evolution and their correlation with material properties based on theoretical calculations. It provides insights into enhancing the efficiency of metal-oxide-based materials through matching.
Article
Nanoscience & Nanotechnology
Krishtappa Manjunatha, Hsin-Hao Chiu, Ming-Kang Ho, Tsu-En Hsu, Shih-Lung Yu, Chu-En Chin, Chia-Liang Cheng, Marisa Carvalho de Oliveira, Elson Longo, Renan A. P. Ribeiro, Hanumanthappa Nagabhushana, Sheng Yun Wu
Summary: By using the co-precipitate method, Mg-doped CoCr2O4 nanoparticles with controlled particle size were synthesized and their properties were investigated. The magnetic inhomogeneity of the nanoparticles was identified as the cause of the observed exchange bias effect. The nanoparticles showed potential applications in magnetic memory and magnetocaloric effect fields.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
D. C. Amaral, L. S. R. Rocha, L. I. Granone, M. M. Lage, M. S. Churio, M. D. Sanchez, E. Longo, H. M. S. Nascimento, M. Assis, F. Moura, M. A. Ponce
Summary: The influence of manganese modification on the spectroscopic features of manganese-doped CeO2 systems synthesized by the microwave-assisted hydrothermal route and their correlation with the presence of O defective structures were verified. Raman and electron paramagnetic resonance studies confirmed the presence of defective clusters formed by dipoles and/or quadrupoles. The number of paramagnetic species was found to be inversely proportional to the doping concentration, resulting in an increase in the Mn2+ signal, likely due to the reduction of Mn3+ species after the interaction with CO. X-ray photoelectron spectroscopy data showed significant changes in the Ce3+ and Mn2+ configurations with the introduction of manganese modification, suggesting the formation of nonparamagnetic Ce4+ species and the persistence of paramagnetic Mn2+ species.
INORGANIC CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Guilhermina Ferreira Teixeira, Heitor Secco Seleghini, Wagner Benicio Bastos, Natalia Jacomaci, Bojan Stojadinovic, Zorana Dohcevic-Mitrovic, Flavio Colmati, Miguel Angel San-Miguel, Elson Longo, Maria Aparecida Zaghete
Summary: Na2Nb2O6•H2O fibers were synthesized using a microwave-assisted hydrothermal method and used as a precursor for obtaining NaNbO3 fibers with piezoelectric characteristics. The NaNbO3 fibers consist of a mix of antiferroelectric and ferroelectric orthorhombic phases. Piezoresponse force microscopy revealed that the fibers have regions with ferroelectric domains and regions with no ferroelectric characteristics.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Roumanos Georges Dib Neto, Wagner Costa Macedo, Jose Diego Fernandes, Agda Eunice de Souza, Silvio Rainho Teixeira, Kleper de Oliveira Rocha, Elson Longo
Summary: Manganese oxides were synthesized via Microwave-Assisted Hydrothermal (MAH) method and characterized at different temperatures. The analysis results revealed the presence of five distinct phases and the occurrence of oxidation and reduction reactions. The chemical characterization indicated the presence of sodium ions, which can be used as intercalation compounds for energy storage device optimization.
MATERIA-RIO DE JANEIRO
(2022)
Article
Chemistry, Inorganic & Nuclear
Ivo M. Pinatti, Ana C. M. Tello, Paula F. S. Pereira, Aline B. Trench, Marcio D. Teodoro, Ieda L. V. Rosa, Alberico B. F. da Silva, Elson Longo, Juan Andres, Alexandre Z. Simoes
Summary: A systematic study was conducted to investigate the relationship between photoluminescence emissions and photocatalytic activity of Ag2SeO4 obtained by different synthesis methods. Experimental characterization techniques and density functional theory calculations were used to understand its structural order and surface properties. The results showed that the Ag2SeO4 synthesized by the coprecipitation method exhibited the most intense photoluminescence band and the best photocatalytic activity for rhodamine B degradation under UV light irradiation.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Physical
Cristian Dias Fernandes, Mateus Meneghetti Ferrer, Cristiane Wienke Raubach, Eduardo Ceretta Moreira, Luciano Timm Gularte, Sergio da Silva Cava, Pedro Lovato Gomes Jardim, Ramon Dadalto Carvalho, Elson Longo, Mario Lucio Moreira
Summary: ZnO particles grown as ZnO/ZnS(ZC + TAA) photoelectrodes using the microwave-assisted hydrothermal method exhibit excellent photovoltaic parameters, attributed to better charge transfer and resistance to recombination.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
