Article
Engineering, Electrical & Electronic
Bradha Madhavan, Nagaraj Balakrishnan, Branesh Pillai, Ananth Steephen
Summary: By substituting Zr and doping with samarium, the structure of cerium oxide was stabilized as Ce4+ and the ionic conductivity was improved. The morphology and properties of CeO2 were studied, showing significant enhancement in ionic conductivity.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Multidisciplinary Sciences
Xiao Tang, Dong Zhou, Bao Zhang, Shijian Wang, Peng Li, Hao Liu, Xin Guo, Pauline Jaumaux, Xiaochun Gao, Yongzhu Fu, Chengyin Wang, Chunsheng Wang, Guoxiu Wang
Summary: Rechargeable multivalent-ion batteries, such as those using calcium, magnesium or aluminum, are promising candidates for large-scale electrochemical energy storage. Researchers have developed various aqueous multivalent-ion cells utilizing concentrated aqueous gel electrolytes, sulfur-containing anodes, and high-voltage metal oxide cathodes, showing satisfactory performance and potential for future energy storage technologies.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Prathvi, S. Asha Bhandarkar, Akshayakumar Kompa, Dhananjaya Kekuda, M. S. Murari, Maksim P. Telenkov, K. K. Nagaraja, K. Mohan Rao
Summary: The study found that with increasing Zn2+ concentration, the crystallite size of anatase phase in the thin films decreased, light absorption increased, and the bandgap narrowed. FESEM revealed a homogeneous distribution of grains in the films.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Maria Grazia Betti, Elena Blundo, Marta De Luca, Marco Felici, Riccardo Frisenda, Yoshikazu Ito, Samuel Jeong, Dario Marchiani, Carlo Mariani, Antonio Polimeni, Marco Sbroscia, Francesco Trequattrini, Rinaldo Trotta
Summary: The adsorption of deuterium on nanoporous graphene reveals a homogeneous distribution and the formation of hybrid bonds. This study provides an efficient strategy for obtaining high-quality semiconducting graphane.
Article
Chemistry, Inorganic & Nuclear
Priyanka Phalswal, Mudit Gadhok, Pawan K. Khanna
Summary: Few-layer nanosheets of MoS2 were synthesized in a household microwave oven using ammonium heptamolybdate, thiourea, and hydrazine hydrate in ethylene glycol. The binding energy values of 226.1 eV (S 2s) and 229.16, 232.16 eV for Mo 3d confirmed the formation of MoS2. The obtained MoS2 nanosheets were converted to phase pure nanoplatelets of MoO3 through a sintering process, with an average crystallite size of about 30-35 nm.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Xenia Garcia, Lluis Soler, Albert Casanovas, Carlos Escudero, Jordi Llorca
Summary: Ceria nanoshapes with different crystallographic planes exhibited varying activity in carbon soot oxidation, with {110} and {100} facets being more active than {111}. Raman studies showed interaction between isolated graphene layers in carbon soot and ceria lattice oxygen atoms. Exposure to O2 generated surface active oxygen species which were highly reactive in oxidizing the graphitic structures of carbon soot.
Article
Chemistry, Physical
Yu Zhang, Shengtao Zhang, Bochuan Tan, Lei Guo, Hantang Li
Summary: Novel N-doped carbon dots (N-CDs) were synthesized and investigated for their inhibition performance on copper, showing high suppression efficiency. The interaction between N-CDs and copper substrate, as well as the anticorrosion mechanism, were explored in detail through various techniques. The aim of the study is to explore eco-friendly and efficient corrosion inhibitor materials for metal protection.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Inorganic & Nuclear
Parmish Kaur, Arbresha Muriqi, Jan-Lucas Wree, Ramin Ghiyasi, Muhammad Safdar, Michael Nolan, Maarit Karppinen, Anjana Devi
Summary: A novel atomic/molecular layer deposition process for cerium-based metal-organic hybrid films is presented in this study. Using a highly reactive cerium(iii) guanidinate precursor in combination with specific organic precursors, the hybrid films were grown at high growth rates. The films showed favorable UV absorption properties and potential applications as redox active materials and UV-absorbing materials.
DALTON TRANSACTIONS
(2022)
Article
Energy & Fuels
Feng Zhang, Shuanglong Li, Qianqian Liu, Jingyun Sun, Xin Wei, Mingyan Gu, Yang Wang, Xiangyong Huang
Summary: Ammonia, as a carbon-free and hydrogen-rich fuel, has garnered increasing attention. Co-combustion of ammonia and hydrocarbon fuel can enhance ammonia's combustion characteristics and mitigate CO2 emissions. This study investigated the co-flow ethylene diffusion flame with varying ammonia addition ratios and examined the surface functional groups and graphitization structure of soot particles. The results showed that ammonia accelerated soot graphitization, increased the degree of graphitization, and elevated the content of oxygen-containing functional groups on soot surfaces.
Article
Chemistry, Physical
Sahana Nagappa Moger, Vasant Sathe, M. G. Mahesha
Summary: Zinc sulfoselenide films were prepared by thermal co-evaporation and the variation in composition was found to affect their structural and optical properties. The presence of sulfur and selenium vacancy in the deposited films was confirmed, and analysis of photoluminescence spectra and Raman spectroscopy explained the chemical state and enhancement of electrical conductivity.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Physical
Nirmala Rani, Kanika Khurana, Neena Jaggi
Summary: CNTs based nanocomposites are highly promising materials in various fields due to their excellent properties. This research focused on spectroscopic study of FMWCNTs nanocomposites with different wt% of SnO2 NPs, confirming structural defects through XRD and Raman spectroscopy, chemical composition through XPS, and morphology through FESEM and TEM analysis. FTIR spectroscopy was used to validate the presence of different functional groups on the FMWCNTs and SnO2/FMWCNTs nanocomposites.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Physical
Andre do Nascimento Barbosa, Cesar Augusto Diaz Mendoza, Yu Lei, Marco Giarola, Mauricio Terrones, Gino Mariotto, Fernando Lazaro Freire Junior
Summary: Defect engineering plays a crucial role in improving specific properties of two-dimensional materials. This study synthesized monolayer WS2 using chemical vapor deposition and introduced defects through Ar plasma treatment. The changes in properties were analyzed using various spectroscopy techniques, revealing the influence of defects on photoluminescence signal and providing a quantitative analysis of defect evolution in WS2 monolayers.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Physical
Kamlesh Chandekar, S. P. Yadav, Shamal Chinke, Mohd. Shkir
Summary: The magnetic properties of cobalt-doped nickel ferrite nano-particles were investigated in this study. The particles were synthesized using the sol-gel auto-combustion method. The sizes and morphologies of the particles were determined using X-ray diffraction and high-resolution transmission electron microscopy. The magnetic properties, including coercivity, saturation magnetization, and magnetic anisotropy, were measured. The results suggest that the cobalt-doped nickel ferrite nano-particles can be used for magnetic storage devices and recording media.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Xiaobo He, Lijun Wang, Kuochih Chou
Summary: In this study, the interfacial element distribution and structure of CaO-SiO2-10%mass MnO slag were explored using gas-slag equilibrium experimental method and XPS detection method. The results showed that the interface sulfide capacity continuously decreases as the etching depth increases, possibly due to the d electron supplement from Mn. The structural units obtained by Raman spectroscopy are closer to the CaO-SiO2 system, while the interfacial structure tends towards the MnO-SiO2 system.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Dheryck Schwendler Cabeda, Guilherme Koszeniewski Rolim, Gabriel Vieira Soares, Antonio Marcos Helgueira de Andrade, Claudio Radtke
Summary: Sulfurization can be used as an alternative to chemical vapor deposition for obtaining WS2 layers with specific thickness. However, the efficiency of sulfurization and the timing of S introduction play a crucial role in determining the characteristics of WS2 layers.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
G. D. Soria, K. Freindl, J. E. Prieto, A. Quesada, J. de la Figuera, N. Spiridis, J. Korecki, J. F. Marco
Summary: CoFe2O4 thin films of different thicknesses were grown on Pt(111) and subsequently annealed. Annealing increased the grain size, induced magnetic ordering at room temperature, and caused cobalt segregation to the surface. Cationic distribution was affected by annealing in oxygen or vacuum.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Miguel Angel Cobos, Antonio Hernando, Jose Francisco Marco, Ines Puente-Orench, Jose Antonio Jimenez, Irene Llorente, Asuncion Garcia-Escorial, Patricia de la Presa
Summary: In this study, the antiferromagnetic transition of ZnFe2O4 was investigated, revealing the formation of locally ferrimagnetic phase and coexistence with antiferromagnetic and spin disordered regions when the inversion degree δ is slightly different from zero. The spin disorder disappears under an applied field, and the volume fractions of the three magnetic phases are roughly equal. These results highlight the significant impact of the inversion degree δ on the magnetic properties.
Article
Materials Science, Multidisciplinary
Mohamed Oujja, Karima Tabakkouht, Mikel Sanz, Esther Rebollar, Maria Sanchez-Arenillas, Jose F. Marco, Marta Castillejo, Rebeca de Nalda
Summary: Smooth and uniform amorphous SiC films were successfully grown on Si and SrTiO3 substrates using nanosecond pulsed laser deposition. The morphology, crystallinity, and composition of the films were influenced by the laser wavelength and substrate temperature. The films were characterized by various analytical techniques, and optical emission spectroscopy was employed to evaluate the correlation between the plasma characteristics and film growth.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Physical
Claudio Araya-Lopez, Jael Conejeros, Cristian Valdebenito, Rene Cabezas, Gaston Merlet, Jose F. Marco, Gabriel Abarca, Ricardo Salazar, Julio Romero
Summary: A new type of ionic liquids based on triazoles supported on alumina has been developed for the dehydration of fructose to selectively produce 5-HMF. The catalysts based on triazolium-ionic liquids supported on Al2O3 were synthesized and used for the synthesis of 5-HMF from fructose in DMSO as the reaction solvent.
Article
Chemistry, Physical
Tengfei Song, Lin Chen, Dominika Gastol, Bo Dong, Jose F. Marco, Frank Berry, Peter Slater, Daniel Reed, Emma Kendrick
Summary: A novel Sn-modified O3-type layered oxide cathode has been developed, demonstrating improved high-voltage stability through bulk Sn doping and surface coating in a one-step process, leading to enhanced cycling performance and capacity retention.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
C. Ferrer, J. Isasi, P. Arevalo, M. Fernandez-Ramos, M. Rapp, M. Alcolea, J. F. Marco, F. Martin-Hernandez
Summary: This study investigated the optimal synthesis conditions of nickel ferrite samples with small particle size and evaluated their properties using various characterization techniques. The samples synthesized with urea exhibited square particles, while those prepared with potassium hydroxide showed spherical particles. The sample synthesized with urea and functionalized with AEPDMS demonstrated the best adsorption capacity for Cu2+ ions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
G. D. Soria, A. Serrano, J. E. Prieto, A. Quesada, G. Gorni, J. de la Figuera, J. F. Marco
Summary: We investigated the influence of the annealing treatment on the crystalline growth of previously deposited SrFe12O19 films on Si (100) substrates by RF magnetron sputtering. The results showed that the as-grown film consisted of nanocrystalline maghemite nanoparticles and amorphous strontium oxide, while the annealed film exhibited a strontium hexaferrite canonical structure with a c-axis orientation. The findings were obtained through various analysis techniques, including Mossbauer spectroscopy, EXAFS, and XANES data.
JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
P. G. de la Iglesia, O. Garcia-Moreno, J. L. Menendez, R. Torrecillas, J. F. Marco
Summary: Calcium hexaluminate forms solid solutions with magnetic ions, allowing for the design of magnetic behavior based on composition. In this study, various synthesis methods of calcium hexaluminate with iron were investigated to determine the maximum percentage of iron that can exhibit magnetic behavior.
JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Engineering, Chemical
Nicolas Soto-Donos, Lidia Favier, Sandra Fuentes Villalobos, Veronica Paredes-Garcia, Thierry Bataille, Jose F. Marco, Raluca Maria Hlihor, Eric Le Fur, Diego Venegas-Yazigi
Summary: This study successfully synthesized a new composite named TiO2@La(OH)2Cl using a sol-gel and hydrothermal route. The composite consists of micrometric platelets of La(OH)2Cl covered by c.a. 10 nm TiO2 anatase nanoparticles. The composite exhibited excellent photocatalytic activity compared to pure anatase and pure La(OH)2Cl, showing the positive role of the synergy between the two solids. The composite was also effective in degrading cetirizine and showed low toxicity in phytotoxicity investigations. These findings demonstrate the excellent catalytic efficiency and potential applications of the new synthesized material for water purification.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Jose F. Marco, Juan Z. Davalos-Prado, Drahomir Hnyk, Josef Holub, Ofelia B. Ona, Diego R. Alcoba, Maxime Ferrer, Jose Elguero, Luis Lain, Alicia Torre, Josep M. Oliva-Enrich
Summary: High-level quantum-chemical computations were performed in combination with Mo??ssbauer and X-ray photoelectron spectroscopies to investigate the geometric and electronic structure of the paramagnetic salt [Fe(1,2-C2B9H11)2]Cs = FeSanCs. Comparisons between experimental 57Fe isomer shifts and quadrupole splitting parameters and theoretical predictions showed good agreement. The presence of two sets of Cs(3d) doublets in the XPS spectrum indicated the existence of two different chemical environments for Cs due to the easy movement of the Cs(+) cation around the sandwich complex.
Article
Nanoscience & Nanotechnology
Pamela M. Sepulveda, Sebastiain A. Campos, Wendy Calzadilla, Jose F. Marco, Juliano C. Denardin, Ricardo A. Salazar-Gonzalez
Summary: In this study, Fe2O3-Ni, Fe2O3-Ni-Pd, MgO-Ni, and MgO-Ni-Pd nanoparticles were synthesized and used for the degradation of florfenicol (FLO). The degradation mechanisms of FLO using Fe2O3-Ni and MgO-Ni nanocatalysts were compared, and the effect of Pd incorporation on the degradation processes was evaluated. The results showed that the degradation of FLO was mainly achieved through the heterogeneous photo-Fenton process, with Fe2O3-Ni and MgO-Ni nanocatalysts achieving 78% and 44% removal of the antibiotic, respectively. The incorporation of Pd improved the degradation efficiency by 22%. Organic intermediates produced during the degradation were identified, and a degradation pathway was proposed. These findings suggest that heterogeneous Fenton and photo-Fenton processes using nanoparticles as catalysts are a promising method for the degradation of FLO in water.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Mickella Dawkins, David Saal, Jose F. Marco, James Reynolds, Sandra Dann
Summary: Experiments on the catalytic pyrolysis of methane using an iron ore-based catalyst were conducted to optimize catalytic activity and examine the purity of the carbon produced. The effect of ball milling the iron ore for different times (from 30 to 330 min) at 300 rpm on methane conversion was studied. Optimal milling for 270 min resulted in a significant increase in methane conversion to 5%, but further grinding led to a decline in conversion to 4% due to particle agglomeration.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Alvaro Tolosana-Moranchel, Alvaro Garcia, Alvaro Garcia-Corral, Jose F. Marco, L. Pascual, Dalia Liuzzi, Mohamed A. Salam, Pilar Ferrer, Jorge Torrero, David C. Grinter, Georg Held, Daniel Garcia Sanchez, K. Andreas Friedrich, Maria Retuerto, Sergio Rojas
Summary: The overall performance of proton exchange membrane fuel cells is limited by the sluggish kinetics of the oxygen-reduction reaction (ORR). Among the most active PGM-free ORR electrocatalysts are metal-nitrogen-carbon (M-N-C), such as Fe-N-C. In this work, a Fe/N/C catalyst was synthesized via thermal treatment of a polymeric CxNy precursor obtained by the wet-polymerization of melamine (a nitrogen rich molecule) and terephthaldehyde, and it displayed high ORR activity in acid electrolyte compared to other Fe-N-C catalysts.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Physical
Alexander J. Mayer, Owain T. Beynon, Andrew J. Logsdail, K. G. Upul Wijayantha, Sandra E. Dann, Jose F. Marco, Joshua D. Elliott, Matteo Aramini, Giannantonio Cibin, Simon A. Kondrat
Summary: In this study, we investigated the speciation of potassium within Prussian blue during cyclic voltammetry using operando potassium K-edge XANES analysis. It was found that potassium ions are located within the channels of the Prussian blue structure but are displaced towards the periphery of the channels by occluded water and/or structural water. These findings demonstrate the potential of XANES to directly study the nature and evolution of potassium species during electrochemical processes.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)