Article
Nanoscience & Nanotechnology
Mei Ying Liu, Jun Xi Yu, Xiao Li Zhu, Zhi Ping Bian, Xiang Zhou, Yu Hang Liang, Zhen Lin Luo, Yue Wei Yin, Jiang Yu Li, Xiang Ming Chen
Summary: In this study, h-Lu1-xInxFeO3 thin films were successfully prepared with a stable hexagonal structure achieved at room temperature. The films exhibited high remanent polarization and excellent polarization switching performance, along with a strong magnetoelectric coupling effect. These results demonstrate the potential application of h-Lu1-xInxFeO3 thin films in magnetoelectric memory and detection devices.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Hamed Sharifi Dehsari, Morteza Hassanpour Amiri, Kamal Asadi
Summary: Experimental realization of thin films with significant room-temperature magnetoelectric coupling coefficient α(ME) without an external DC magnetic field has been challenging. Here, large α(ME) of 750 +/- 30 mV Oe(-1) cm(-1) is achieved in multiferroic polymer nanocomposites (MPCs) thin films. The MPCs consist of PMMA-grafted cobalt-ferrite nanoparticles uniformly dispersed in piezoelectric polymer P(VDF-TrFE). Nanoparticle agglomeration is reduced by surface functionalization with PMMA, enabling the uniform dispersion of nanoparticles in submicrometer thin films. This research can promote the development of flexible and printable multiferroic electronic devices for sensing and memory applications.
Article
Chemistry, Multidisciplinary
Hao Li, Yali Yang, Shiqing Deng, Hui Liu, Tianyu Li, Yuzhu Song, He Bai, Tao Zhu, Jiaou Wang, Huanhua Wang, Er-Jia Guo, Xianran Xing, Hongjun Xiang, Jun Chen
Summary: Regulating the magnetic properties of multiferroics enables their potential application in spintronic devices. By utilizing oxygen defect engineering, we significantly enhanced the room temperature ferromagnetism of a representative ferrite, EuFeO3. Our findings suggest that the decrease in Fe-O-Fe bond angles caused by oxygen vacancies strengthens magnetic interactions and tilts Fe spins, leading to an approximately five-fold increase in saturation magnetization. Furthermore, we established the internal relationship between magnetism and oxygen vacancies by illustrating how magnetic structure and magnitude change with varying vacancy configuration and concentration. This strategy for regulating magnetic properties has broad applicability to various functional oxide materials.
Article
Materials Science, Ceramics
Wenyue Zhao, Zhao Wang, Ze Li, Yazhou Peng, Lei Shi, Wenjing Hua, Lidong Wang, Wei-Dong Fei, Yu Zhao
Summary: In this paper, the effect of defect dipoles on the ferromagnetic and ferroelectric properties of Ca3Mn2O7 improper ferroelectric thin films is reported. Both Mn3+-V···O and Li+-Al3+ defect dipoles can introduce ferromagnetism in the films, and Li+-Al3+ defect dipole can also improve ferroelectricity. The local lattice distortion plays a crucial role in the multiferroic properties of the film.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Yongtao Li, Zhaoyang Li, Xiaosong Wang, Hengshuai Li, Jie Su, Hongguang Zhang, Xuemin He, Zongtao Chi, Liqing Liu
Summary: In this study, Bi5FeTi3O15 (BFTO) thin films were successfully obtained using a sol-gel process, exhibiting advanced multiferroic properties. The scaling relationship of the dynamic ferroelectric hysteresis with the applied electrical field magnitude and frequency was investigated, with the findings indicating the potential applications of BFTO thin films in multi-state storage due to the insensitivity of domain reversal to both frequency and electrical field magnitude.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Anju Thomas, Logu Thirumalaisamy, Sridharan Madanagurusamy, Kalainathan Sivaperuman
Summary: In this study, SnO2 thin films were deposited through spray pyrolysis and tested for gas sensing at 27℃ (room temperature) towards different gases. The films showed consistently low response of approximately 1 when exposed to various VOCs. Hall measurements were used to determine the type, concentration, and mobility of charge carriers, which were found to hinder its performance at room temperature.
Article
Chemistry, Physical
Cecilia Guillen
Summary: Tungsten oxide thin films have versatile semiconductor properties that are dependent on oxygen content and crystalline state. Oxygen vacancies create new absorption bands, resulting in colored films. Crystal structure disorders affect electrical and optical characteristics.
Article
Chemistry, Multidisciplinary
Santhosh Nallakumar, Logu Thirumalaisamy, Sridharan Madhanagurusamy, Sivaperuman Kalainathan, Muthurakku Usha Rani
Summary: The presence of VOCs poses a threat to human health and air quality. Dimethylamine, a highly toxic amine, can directly impact the respiratory system. To address health risks, dimethylamine gas sensors are necessary. However, binary metal oxides face limitations in terms of operating temperatures and selectivity. This study deposited inverse spinel cobalt tin oxide (Co2SnO4) thin films using the chemical spray pyrolysis method. The annealing conditions were adjusted to control the phases. Interestingly, the ordered inverse spinel transformed into a disordered spinel at higher annealing temperatures. The ordered inverse spinel porous nanograin Co2SnO4 thin films exhibited an excellent gas response of 193.53 +/- 2.7 standard deviations at room temperature, signifying their potential use as dimethylamine gas sensors.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Jun Zhang, Wuhong Xue, Tiancong Su, Huihui Ji, Guowei Zhou, Fengxian Jiang, Zhiyong Quan, Xiaohong Xu
Summary: The study focused on room-temperature multiferroic material GFO with ferrimagnetism, fabricating a thin film on a single-crystal substrate to demonstrate reversible and nonvolatile nanoscale magnetic domain reversal under purely electrical fields. The results showed a high potential for GFO thin film in next-generation magnetoelectric multifunctional devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Electrical & Electronic
Fang Hu, Wenjie Ming, Liu Yang, Can Huang, Hongyang Zhao, Shuhong Xie, Zhenxiang Cheng, Tingting Jia
Summary: This article investigates the resistive switching mechanism in solid solution oxides, successfully fabricating binary and ternary solid solution films with switchable polarization, weak magnetism, and reversible resistive switching effects. Multi-stage resistive switching behavior was observed, with the binary film demonstrating four resistive switching states. The dominant role of oxide vacancy/valance exchange-induced defects in the resistive switching effect of complex oxide thin films is discussed.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Minghang Li, Hanqi Pi, Yunchi Zhao, Ting Lin, Qinghua Zhang, Xinzhe Hu, Changmin Xiong, Zhiyong Qiu, Lichen Wang, Ying Zhang, Jianwang Cai, Wuming Liu, Jirong Sun, Fengxia Hu, Lin Gu, Hongming Weng, Quansheng Wu, Shouguo Wang, Yunzhong Chen, Baogen Shen
Summary: Heat current in ferromagnets can produce a transverse electric voltage perpendicular to magnetization, known as the anomalous Nernst effect (ANE). ANE arises from large Berry curvature and density of states near the Fermi energy. It has advantages over the conventional longitudinal Seebeck effect in converting waste heat to electricity due to its unique transverse geometry. However, materials with giant ANE are still being explored.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Jun Kasahara, Tsukasa Katayama, Shishin Mo, Akira Chikamatsu, Yosuke Hamasaki, Shintaro Yasui, Mitsuru Itoh, Tetsuya Hasegawa
Summary: By preparing h-DyFeO3 films through epitaxial stabilization, the research team successfully expanded the AFE temperature range to 10-300K. The AFE phase originates from a nanomosaic structure comprising AFE P(3)over bar c1 - and ferroelectric P6(3)cm domains with small domain sizes of 1-10 nm, and weak ferromagnetism and magnetocapacitance behaviors are observed.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Monika Gupta, Huzein Fahmi Hawari, Pradeep Kumar, Zainal Arif Burhanudin, Nelson Tansu
Summary: This study presents a highly edge functionalized chemically synthesized reduced graphene oxide (rGO) thin film for fast sensing response of CO2 gas at room temperature. The functionalized rGO sensor shows high sensing properties with short response and recovery time, suggesting potential applications in enhanced oil recovery, industrial and domestic safety.
Article
Chemistry, Physical
Fei Sun, Deyang Chen, Xingsen Gao, Jun-Ming Liu
Summary: BiFeO3, a single-phase multiferroic material, has various polymorphs and strong sensitivity to strain. Recent interest has been focused on emergent strain engineering in BiFeO3 thin films, using non-traditional methods to create new ground states and functionalities.
JOURNAL OF MATERIOMICS
(2021)
Article
Materials Science, Ceramics
Guoqing Liang, Sichen Xu, Hao Zhou, Xiaodong Su, Run Zhao, Hao Yang, Rujun Tang
Summary: This study elucidates the dielectric relaxation properties of multiferroic hexaferrite thin films and their significant impact on magnetoelectric devices.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Huan Tan, Jike Lyu, Yunwei Sheng, Pamela Machado, Tingfeng Song, Akash Bhatnagar, Mariona Coll, Florencio Sanchez, Josep Fontcuberta, Ignasi Fina
Summary: Piezoelectric force microscopy (PFM) is a powerful tool to study ferroelectric materials, but extrinsic effects from surface charges often complicate the data interpretation. In this study, we determined the compensating voltage for different ferroelectric materials by comparing with the corresponding I-V characteristics. We found that the asymmetry of the I-V characteristics is related to the sign and magnitude of the bias voltage required to compensate for surface charges.
APPLIED SURFACE SCIENCE
(2023)
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
Physics, Applied
Yunwei Sheng, Mathieu Mirjolet, Mario Villa, Jaume Gazquez, Jose Santiso, Andreas Klein, Jordi Fraxedas, Josep Fontcuberta
Summary: Epitaxial LaFeO3-based photocells with different thicknesses were grown on LSAT single-crystal substrates, using LSMO and Pt/BLSO electrodes, to determine their photoresponse. The short-circuit photocurrent initially increases and then decreases with LFO thickness, and is larger or smaller with Pt or BLSO electrodes. The open-circuit voltage shows the opposite trend, being smaller or larger with Pt and BLSO, respectively, consistent with the electronic band alignments and rectifying character of the dark current-voltage data. The complex microstructure and grain boundaries of the films play a significant role in the observed responsivity, which is larger than in similar LFO-based structures.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
J. W. Adkins, I. Fina, F. Sanchez, S. R. Bakaul, J. T. Abiade
Summary: In this study, the influence of controllable polarization reversal and built-in electric fields on pyroelectric and electrocaloric effects in a BaTiO3 thin film is examined using a modified indirect method. It is found that the magnitude of the sample's change in polarization with temperature is sensitive to the degree of polarization reversal. The pyroelectric response is small at low fractions of switched polarization and grows larger with higher fractions of reversal. This is attributed to the destabilizing effect of the internal built-in field on low fractions of switched polarization.
APPLIED PHYSICS LETTERS
(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
Slavia Deeksha Dsouza, Marius Buerkle, Bruno Alessi, Paul Brunet, Alessio Morelli, Amir Farokh Payam, Paul Maguire, Davide Mariotti, Vladimir Svrcek
Summary: Nitrogen-doped graphite quantum dots prepared by atmospheric pressure microplasma exhibit high stability and environmentally friendly properties. They emit blue light and are suitable for cellular imaging or optoelectronics applications.
Article
Nanoscience & Nanotechnology
Wid Mekseriwattana, Witthawat Phanchai, Tipparat Thiangtrongjit, Onrapak Reamtong, Theerapong Puangmali, Patompon Wongtrakoongate, Anna Roig, Kanlaya Prapainop Katewongsa
Summary: This study investigated the interactions of SPIONs with ariboflavin (Rf)-citrate ligand with proteins in human serum, as well as the interactions with riboflavin carrier protein (RCP). The results showed that citrate-coated SPIONs exhibited stronger binding to RCP, while Rf-coated SPIONs had lower binding affinity to serum proteins. These findings are important for improving the functionality of Rf ligand, enhancing specific cellular interactions, and improving the Rf-SPIONs as MRI contrast agents for breast cancer.
ACS APPLIED NANO MATERIALS
(2023)
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
Materials Science, Multidisciplinary
Huan Tan, Tingfeng Song, Nico Dix, Florencio Sanchez, Ignasi Fina
Summary: The piezoelectric response in doped ferroelectric HfO2 polycrystalline films has been investigated. The lack of texture in most films hinders a thorough understanding. Epitaxial films enable modification of the ferroelectric phase ratio and crystallographic orientation, providing further insight into the piezoelectric response. The magnitude of the in-plane and out-of-plane piezoelectric responses is mainly governed by the orthorhombic phase and the polar axis of the polarization along the probing direction.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Johanna van Gent, Anna Roig
Summary: Bacterial cellulose (BC) is a biopolymer with multiple applications in the biomedical field. By functionalizing BC with CeO2 NPs, a composite material with self-regenerating antioxidant properties is achieved. Low-temperature in situ syntheses of CeO2 NPs in BC enables the formation of BC-CeO2 composites that exhibit enhanced antioxidant performance due to the incorporation of zirconium.
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)
Article
Physics, Applied
Tingfeng Song, Veniero Lenzi, Jose P. B. Silva, Luis Marques, Ignasi Fina, Florencio Sanchez
Summary: The influence of stress and strain on the stabilization of polar phases and ferroelectric properties is investigated in polycrystalline ferroelectric HfO2 films. Experimental and computational results reveal that stress plays a critical role in the stabilization of the orthorhombic phase and ferroelectric polarization, while lattice deformation effects are relatively small.
APPLIED PHYSICS REVIEWS
(2023)
Article
Nanoscience & Nanotechnology
Tingfeng Song, Panagiotis Koutsogiannis, Cesar Magen, Jose A. Pardo, Florencio Sanchez, Ignasi Fina
Summary: Ferroelectric hafnia is a promising material for non-volatile memory devices, and interface engineering with ZrO2 capping layer can improve its functional properties by reducing defects and interface capacitance contribution.
ADVANCED ELECTRONIC MATERIALS
(2023)
