Article
Crystallography
Wangwang Kuang, Guozhen Zhu
Summary: Orientation-dependent performance has been observed in nanoparticles on substrates. This study investigates the orientation selection rules and finds that energy-favorable orientations are influenced by the surface energy of particles, in addition to the energy difference between particle/substrate interfacial energy and surface energy of the substrate. Experimental results support this finding, showing that different terminations of the substrate result in different orientations of the nanoparticles. The study provides fundamental insights into fabricating supported nanoparticles for practical applications.
Article
Physics, Applied
Tobias Hadamek, Agham B. Posadas, Fatima Al-Quaiti, David J. Smith, Martha R. McCartney, Eric Dombrowski, Alexander A. Demkov
Summary: In this study, thin Ga2O3 films were successfully deposited on SrTiO3 and Si substrates using plasma-assisted molecular beam epitaxy. The orientation and structural alignments of the grains were examined, providing a high-quality seed layer for further epitaxial growth.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Linyuan Wen, Mingtao Li, Jinwen Shi, Yingzhe Liu, Tao Yu, Maochang Liu, Zhaohui Zhou
Summary: This study using first-principles calculations found that strains applied on SrTiO3 surface significantly affect the free energy changes for oxygen evolution reaction (OER), with tensile strains reducing surface energy and OER overpotential, while compressive strains increasing surface energy and OER overpotential. Introducing tensile strains in the synthetic process may enhance OER performance on SrTiO3 surface.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Oscar Gamba, Moritz Eder, Matthias Poglitsch, Jiri Pavelec, Panukorn Sombut, Matthias Meier, Ulrike Diebold, Michael Schmid, Gareth S. Parkinson
Summary: Understanding the varying structure of iron oxide surfaces in different environments is crucial for their application in (geo-)chemistry and modern technologies. This study investigates the Fe-rich terminations of Fe3O4(001) surface, revealing the accommodation and nucleation processes, and providing support for existing models while calling for further theoretical work.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Engineering, Electrical & Electronic
S. Merrad, M. Abbas, R. Brahimi, B. Bellal, M. Trari
Summary: The perovskite SrTiO3-delta synthesized by chemical route was characterized using physical and electrochemical methods. The oxide has a cubic structure with a lattice parameter of 3.907(5) angstrom and a crystallite size of 71 nm. The SEM-EDX analysis revealed spherical grains with an average size of 0.2 μm. The material exhibited n-type behavior in a Na2SO4 solution, attributed to oxygen deficiency.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Analytical
Yue Su, Zhaoxin Geng, Weihao Fang, Xiaoqing Lv, Shicai Wang, Zhengtai Ma, Weihua Pei
Summary: The double-layer self-priming nanoimprint technology enables the fabrication of ordered metal nanostructures on large soft and hard substrates without the need for expensive instruments. It allows for the patterning of different nanostructures and materials, providing a programmable way to adjust the width and height of metal through photoresist thickness and developing conditions. This method can be applied in poor conditions without equipment, reducing the cost of instruments and molds.
Article
Materials Science, Multidisciplinary
Aleksandr V. Plokhikh, Iryna S. Golovina, Matthias Falmbigl, Igor A. Karateev, Alexander L. Vasiliev, Jason Lapano, Roman Engel-Herbert, Jonathan E. Spanier
Summary: Epitaxial perovskite oxide superlattice structures were successfully formed on Si wafers using atomic layer deposition at a lower temperature than typical deposition methods. The control over stacking sequence of different constituents was demonstrated in various superlattices. Regardless of the sequence, all structures maintained coherent strain with slight compressive strain from SrTiO3 sublayers transmitted to BaTiO3 layers.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Sarah J. Hill, Nathan Dao, Vuong Q. Dang, Edward L. Stahl, Laura M. Bohn, Ryan A. Shenvi
Summary: Salvinorins can be used as templates for next generation analgesics, antipruritics, and dissociative hallucinogens by selectively and potently antagonizing the kappa-opioid receptor (KOR). A short asymmetric synthesis is described, which relies on a sterically confined organocatalyst to allow Robinson annulation of an unactivated nucleophile/unstable electrophile pair. Combined with a cobalt-catalyzed polarized diene-alkyne cycloaddition, this route provides access to a focused library of salvinorins. The synthesis is appraised based on its generation of multiple analogs with superior pharmacological profiles compared to salvinorin A itself.
ACS CENTRAL SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Ji-an Chen, Yuyuan Qin, Yubiao Niu, Peng Mao, Fengqi Song, Richard E. Palmer, Guanghou Wang, Shuang Zhang, Min Han
Summary: We demonstrate a new type of disordered metasurface by densely packing plasmonic nanoclusters of ultrasmall size on a planar optical cavity. The system operates as a broadband absorber or offers a reconfigurable absorption band across the visible region, resulting in continuous wavelength-tunable photothermal conversion. We also present a method to measure the temperature of plasmonic metasurfaces via surface-enhanced Raman spectroscopy (SERS) by incorporating single-walled carbon nanotubes (SWCNTs) as an SERS probe within the metasurfaces. Our disordered plasmonic system generated by a bottom-up process offers excellent performance and compatibility with efficient photothermal conversion. Moreover, it provides a novel platform for various hot-electron and energy-harvesting functionalities.
Article
Chemistry, Physical
Nannan Shan, Jessica Catharine Jones, Chunxin Luo, Adam S. Hock, Alex B. F. Martinson, Lei Cheng
Summary: Selective hydroxylation approach may be a viable route to site-selective ALD on In2O3, as predicted and supported by experimental results.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Sneha R. Bhosale, Sharvari A. Ghatage, Pranali N. Wahane, Rakhee R. Bhosale, Kishor S. Jagadhane, Devashree N. Patil, Prashant Anbhule
Summary: In this study, CuO nanostructures were successfully prepared using a simple and cost-effective co-precipitation method, and the effect of precursor concentration on their physico-chemical properties was investigated. The results showed that the CuO nanostructures had a large surface area and porous structure, and exhibited enhanced antimicrobial properties against various bacteria and fungi. Therefore, CuO nanostructures have potential applications in dermatology and biomedicine.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Olga A. Bulavchenko, Tatyana N. Afonasenko, Alexey R. Osipov, Alena A. Pochtar, Andrey A. Saraev, Zahar S. Vinokurov, Evgeny Yu Gerasimov, Sergey Tsybulya
Summary: The study of Mn-Ce oxide catalysts active in CO oxidation revealed that the catalyst containing ca. 50 at.% Mn exhibited the best catalytic performance due to high specific surface area, formation of solid solution, and maximum content of the solid solution.
Article
Nanoscience & Nanotechnology
Qingting Zhang, Andreas Goldbach, Na Ta, Wenjie Shen
Summary: This study explores the selective oxidation of propylene using a composite material of molybdates and silver nanoparticles. The results show that the composite material exhibits high selectivity for propylene conversion to acrolein at 350 degrees C, with complete inhibition of propylene oxide formation. The reaction kinetics of the composite material are consistent with the Mars-van Krevelen mechanism.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Analytical
Aihua Yu, Zhou Li, Jianxin Yi
Summary: This study presents a strategy for synthesizing Pt-functionalized ZnO nanorod arrays for detecting ppb-level H2S gas, showing high sensitivity and selectivity. The enhanced sensing performance can be attributed to the catalytic and electronic promotion effects of Pt and the unique morphology of nanorods.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Energy & Fuels
Ramasubba Reddy Palem, Ganesh Shimoga, Iqra Rabani, Chinna Bathula, Young-Soo Seo, Hyun-Seok Kim, Sang-Youn Kim, Soo-Hong Lee
Summary: Nanocellulose materials are sustainable and environmentally friendly candidates for renewable energy storage applications. In this study, a hierarchical Co3O4@CNC nanohybrid structure was fabricated using a green ball-milling pathway, and its structural and morphological characteristics were investigated. The nanohybrid electrode showed excellent electrochemical performance, with high specific capacitance, cyclic retention, and energy density, making it suitable for enhanced supercapacitor applications.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Gulsum Ersu, Carmen Munuera, Federico J. Mompean, Daniel Vaquero, Jorge Quereda, Joao Elias F. S. Rodrigues, Jose A. Alonso, Eduardo Flores, Jose R. Ares, Isabel J. Ferrer, Abdullah M. Al-Enizi, Ayman Nafady, Sruthi Kuriakose, Joshua O. Island, Andres Castellanos-Gomez
Summary: We have developed a method to fabricate thermoelectric devices on office paper substrates using handcrafting techniques. The devices consist of thin films of WS2, Te, and BP (P-type semiconductors) and TiS3 and TiS2 (N-type semiconductors) deposited by rubbing these materials' powders onto the paper. The semiconducting films exhibit high Seebeck coefficients, reaching (+1.32 +/- 0.27) mV K-1 for WS2 and (-0.82 +/- 0.15) mV K-1 for TiS3. Peltier elements were also constructed by connecting the P- and N-type films with graphite electrodes, achieving a thermopower value of up to 6.11 mV K-1 when the Peltier element had three junctions. This work demonstrates the potential application of semiconducting van der Waals materials in thermoelectric power generation and low-cost disposable electronic devices.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yunwei Sheng, Huan Tan, Alberto Quintana, Mario Villa, Jaume Gazquez, Ignasi Fina, Josep Fontcuberta
Summary: We report on the photovoltaic response of ferroelectric hexagonal LuMnO3 films using vertical capacitors, and find that the presence of electrodes crucially determines the sensitivity of short circuit current density to the ferroelectric polarization direction. Using ultrathin Pt top electrodes allows for a large short circuit current density, but polarization back-switching washes out the dependence on polarization direction.
Article
Chemistry, Physical
Yong Xie, Onur Cakiroglu, Wenshuai Hu, Kexin He, Sergio Puebla, Thomas Pucher, Qinghua Zhao, Xiaohua Ma, Carmen Munuera, Andres Castellanos-Gomez
Summary: A laser trimming method is used to separate single-layer MoS2 from thicker regions, allowing for the fabrication of single-layer MoS2 channels with regular geometry. Electrical characterization and scanning photocurrent microscopy confirm the effective insulation of the single-layer region. This direct-write and lithography-free method provides an alternative to reactive ion etching for patterning MoS2 and similar two-dimensional materials.
Article
Chemistry, Multidisciplinary
Tingfeng Song, Romain Bachelet, Guillaume Saint-Girons, Ignasi Fina, Florencio Sanchez
Summary: By using an ultrathin seed layer, high-quality epitaxial films of orthorhombic Hf0.5Zr0.5O2 can be obtained at a lower temperature, and they exhibit enhanced endurance.
Article
Materials Science, Multidisciplinary
Gulsum Ersu, Yigit Sozen, Estrella Sanchez-Viso, Sruthi Kuriakose, Beatriz H. Juarez, Federico J. Mompean, Mar Garcia-Hernandez, Lea Visscher, Alvaro J. Magdaleno, Ferry Prins, Abdullah M. Al-Enizi, Ayman Nafady, Carmen Munuera, Joshua O. Island, Andres Castellanos-Gomez
Summary: The use of low-cost benchtop plotters combined with refillable writing pens and markers has been studied as an effective method to print nanomaterial-based inks on paper substrates. The approach is robust and precise, allowing for the printing of various solution-processable nanomaterials with narrow pattern features. The study also illustrates the versatility of this printing platform by successfully printing a range of materials with different properties.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Gloria Orfila, David Sanchez-Manzano, Ashima Arora, Fabian Cuellar, Sandra Ruiz-Gomez, Sara Rodriguez-Corvillo, Sandra Lopez, Andrea Peralta, Santiago J. Carreira, Fernando Gallego, Javier Tornos, Victor Rouco, Juan J. Riquelme, Carmen Munuera, Federico J. Mompean, Mar Garcia-Hernandez, Zouhair Sefrioui, Javier E. Villegas, Lucas Perez, Alberto Rivera-Calzada, Carlos Leon, Sergio Valencia, Jacobo Santamaria
Summary: Generation, manipulation, and sensing of magnetic domain walls are important for spintronic devices. La1-xSrxMnO3 (LSMO) manganites show promise due to their robust half-metallic ground state. However, the understanding of domain wall magnetoresistance is limited, with conflicting interpretations of experimental data. In this study, domain wall magnetoresistance is measured in LSMO nanowires, showing large values originating from spin accumulation. This non-adiabatic process has implications for future oxide spintronic sensors.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Edwin Herrera, Beilun Wu, Evan O'Leary, Alberto M. Ruiz, Miguel Agueda, Pablo Garcia Talavera, Victor Barrena, Jon Azpeitia, Carmen Munuera, Mar Garcia-Hernandez, Lin-Lin Wang, Adam Kaminski, Paul C. Canfield, Jose J. Baldovi, Isabel Guillamon, Hermann Suderow
Summary: The orthorhombic compound AuSn4 is similar to the Dirac node arc semimetal PtSn4 in composition. Unlike PtSn4, AuSn4 is a superconductor with a critical temperature of T-c = 2.35 K. Recent measurements indicate quasi-two-dimensional superconducting behavior in AuSn4.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Alexandre Silva, Ignasi Fina, Florencio Sanchez, Jose P. B. Silva, Luis Marques, Veniero Lenzi
Summary: We investigated the influence of La content on the structural and ferroelectric properties of epitaxial HfO2 films. It was found that 2-5 at. % La-doped HfO2 films exhibit optimum remanent polarization and reduced coercive field. Density functional theory calculations supported the experimental results and revealed that the polarization switching in epitaxial La:HfO2 films can be understood based on the synergetic contribution of a non-ferroelectric monoclinic phase and La doping itself.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Physical
Vishal Sharma, Inderpal Singh, Sunil K. Arora, Florencio Sanchez, Fouran Singh, Shilpa Tripathi, S. N. Jha
Summary: We investigated the impact of Ag15+ (200 MeV) ion irradiation on the surface electronic structure of epitaxial LaNiO3 films on (100) oriented LaAlO3 substrates by analyzing La (4d to 4f) and Ni (3p to 3d) photoemission transitions. Results showed slight enhancement in the spectral features for La (4d to 4f) transitions, but no enhancement for Ni (3p to 3d) transitions in both pristine and irradiated samples. Changes in constant initial state (CIS) spectra for La (4d to 4f) transitions and the presence of surface states near the Fermi level in Ni (3p to 3d) transitions were observed, with different ion doses associated with oxygen vacancies. Interestingly, the density of states (DOS) at the Fermi level in Ni (3p to 3d) transition spectra increased systematically with the irradiation dose, and a correlation between DOS at the Fermi level and surface states was found. The highest dose sample exhibited surface states with the highest DOS at the Fermi level, indicating an upward shift of surface states with increasing irradiation dose.
SURFACES AND INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Roberto Munoz, Laia Leon-Boigues, Elena Lopez-Elvira, Carmen Munuera, Luis Vazquez, Federico Mompean, Jose Angel Martin-Gago, Irene Palacio, Mar Garcia-Hernandez
Summary: The modification of graphene surface with polymers allows for expanding its applications as a hybrid material. However, the chemical inertness of graphene poses a challenge for covalent functionalization. Researchers have developed a clean and scalable method to enhance the graphene chemical activity and synthesized a large-scale graphene-polymer hybrid material.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Inorganic & Nuclear
Jhonatan R. Guarin, Carlos Frontera, Judith Oro-Sole, Jaume Gazquez, Clemens Ritter, Josep Fontcuberta, Amparo Fuertes
Summary: Europium tantalum perovskite oxynitrides were successfully prepared by a new high-temperature solid-state synthesis method. The crystal structure and magnetic properties of the materials can be tuned by different reactant mixtures and gas atmospheres. Among them, Eu3Ta3O3.66N5.34 is the first example of a triple perovskite oxynitride.
INORGANIC CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Jose P. B. Silva, Ruben Alcala, Uygar E. Avci, Nick Barrett, Laura Begon-Lours, Mattias Borg, Seungyong Byun, Sou-Chi Chang, Sang-Wook Cheong, Duk-Hyun Choe, Jean Coignus, Veeresh Deshpande, Athanasios Dimoulas, Catherine Dubourdieu, Ignasi Fina, Hiroshi Funakubo, Laurent Grenouillet, Alexei Gruverman, Jinseong Heo, Michael Hoffmann, H. Alex Hsain, Fei-Ting Huang, Cheol Seong Hwang, Jorge Iniguez, Jacob L. Jones, Ilya V. Karpov, Alfred Kersch, Taegyu Kwon, Suzanne Lancaster, Maximilian Lederer, Younghwan Lee, Patrick D. Lomenzo, Lane W. Martin, Simon Martin, Shinji Migita, Thomas Mikolajick, Beatriz Noheda, Min Hyuk Park, Karin M. Rabe, Sayeef Salahuddin, Florencio Sanchez, Konrad Seidel, Takao Shimizu, Takahisa Shiraishi, Stefan Slesazeck, Akira Toriumi, Hiroshi Uchida, Bertrand Vilquin, Xianghan Xu, Kun Hee Ye, Uwe Schroeder
Summary: Ferroelectric hafnium and zirconium oxides have shown significant progress in ultralow-power electronic systems, but technical limitations still hinder their application. This article aims to provide a comprehensive overview of the current state, challenges, and prospects for the development of these materials, with the collaboration of experts from different fields.
Article
Engineering, Electrical & Electronic
Alberto Quintana, Carlos Zarco, Nico Dix, Florencio Sanchez, Ignasi Fina, Josep Fontcuberta
Summary: Flexible FeRh films of high crystalline quality can be synthesized by using mica as a substrate, followed by a mechanical exfoliation of the mica, which display a sharp antiferromagnetic to ferromagnetic phase transition. The films exhibit two distinguishable resistance states that can be written after a field-cooling procedure, and the memory states are robust under magnetic fields of up to 10 kOe.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Xueliang Lyu, Tingfeng Song, Alberto Quintana, Ignasi Fina, Florencio Sanchez
Summary: Cooling conditions have less impact on the phase stability of epitaxial Hf0.5Zr0.5O2 films, and the ferroelectric properties of the films are more stable compared to polycrystalline films.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Xiao Long, Huan Tan, Florencio Sanchez, Ignasi Fina, Josep Fontcuberta
Summary: The recent discovery of ferroelectricity in doped HfO2 has opened possibilities for the development of memristors based on ferroelectric switching. In this study, ferroelectricity and significant electro-resistance were observed in Hf0.5Zr0.5O2 tunnel junctions grown on Si. After a soft breakdown, where the resistance decreased by five orders of magnitude, ferroelectricity and electroresistance were still observed.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
