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Haoxin Mai, Teng Lu, Qian Li, Qingbo Sun, Khu Vu, Hua Chen, Genmiao Wang, Mark G Humphrey, Felipe Kremer, Li Li, Ray L Withers, Yun Liu
In this report, a ferroelectric-luminescent heterostructure is designed to convert infrared light into electric power. We use BiFeO3 (BFO) as the ferroelectric layer, and Y2O3:Yb,Tm (YOT) as the upconversion layer. Different from conventional ferroelectric materials, this heterostructure exhibits switchable and stable photovoltaic effects under 980 nm illumination, whose energy is much lower than the bandgap of BFO. The energy transfer mechanism in this heterostructure is therefore studied carefully. It is found that a highly efficient non-radiative energy transfer process from YOT to BFO plays a critical role in achieving the below-bandgap-photon excited photovoltaic effects in this heterostructure...
August 8, 2018: ACS Applied Materials & Interfaces
Jhih-Wei Chen, Shun-Tsung Lo, Sheng-Chin Ho, Sheng-Shong Wong, Thi-Hai-Yen Vu, Xin-Quan Zhang, Yi-De Liu, Yu-You Chiou, Yu-Xun Chen, Jan-Chi Yang, Yi-Chun Chen, Ying-Hao Chu, Yi-Hsien Lee, Chung-Jen Chung, Tse-Ming Chen, Chia-Hao Chen, Chung-Lin Wu
Interest in bringing p- and n-type monolayer semiconducting transition metal dichalcogenides (TMD) into contact to form rectifying pn diode has thrived since it is crucial to control the electrical properties in two-dimensional (2D) electronic and optoelectronic devices. Usually this involves vertically stacking different TMDs with pn heterojunction or, laterally manipulating carrier density by gate biasing. Here, by utilizing a locally reversed ferroelectric polarization, we laterally manipulate the carrier density and created a WSe2 pn homojunction on the supporting ferroelectric BiFeO3 substrate...
August 7, 2018: Nature Communications
Linze Li, Jacob R Jokisaari, Yi Zhang, Xiaoxing Cheng, Xingxu Yan, Colin Heikes, Qiyin Lin, Chaitanya Gadre, Darrell G Schlom, Long-Qing Chen, Xiaoqing Pan
Domain walls (DWs) have become an essential component in nanodevices based on ferroic thin films. The domain configuration and DW stability, however, are strongly dependent on the boundary conditions of thin films, which make it difficult to create complex ordered patterns of DWs. Here, it is shown that novel domain structures, that are otherwise unfavorable under the natural boundary conditions, can be realized by utilizing engineered nanosized structural defects as building blocks for reconfiguring DW patterns...
August 6, 2018: Advanced Materials
M A Basith, Ragib Ahsan, Ishrat Zarin, M A Jalil
A comprehensive comparison between BiFeO3 -reduced graphene oxide (rGO) nanocomposite and Bi25 FeO40 -rGO nanocomposite has been performed to investigate their photocatalytic abilities in degradation of Rhodamine B dye and generation of hydrogen by water-splitting. The hydrothermal technique adapted for synthesis of the nanocomposites provides a versatile temperature-controlled phase selection between perovskite BiFeO3 and sillenite Bi25 FeO40 . Both perovskite and sillenite structured nanocomposites are stable and exhibit considerably higher photocatalytic ability over pure BiFeO3 nanoparticles and commercially available Degussa P25 titania...
July 23, 2018: Scientific Reports
Ji Ma, Jing Ma, Qinghua Zhang, Renci Peng, Jing Wang, Chen Liu, Meng Wang, Ning Li, Mingfeng Chen, Xiaoxing Cheng, Peng Gao, Lin Gu, Long-Qing Chen, Pu Yu, Jinxing Zhang, Ce-Wen Nan
Charged domain walls in ferroelectrics exhibit a quasi-two-dimensional conduction path coupled to the surrounding polarization. They have been proposed for use as non-volatile memory with non-destructive operation and ultralow energy consumption. Yet the evolution of domain walls during polarization switching makes it challenging to control their location and conductance precisely, a prerequisite for controlled read-write schemes and for integration in scalable memory devices. Here, we explore and reversibly switch the polarization of square BiFeO3 nanoislands in a self-assembled array...
July 23, 2018: Nature Nanotechnology
Ayan Mukherjee, Sankalpita Chakrabarty, Neetu Kumari, Wei-Nien Su, Suddhasatwa Basu
Reduced graphene oxide (RGO)-supported bismuth ferrite (BiFeO3 ) (RGO-BFO) nanocomposite is synthesized via a two-step chemical route for photoelectrochemical (PEC) water splitting and photocatalytic dye degradation. The detailed structural analysis, chemical coupling, and morphology of BFO- and RGO-supported BFO are established through X-ray diffraction, Raman and X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy studies. The modified band structure in RGO-BFO is obtained from the UV-vis spectroscopy study and supported by density functional theory (DFT)...
June 30, 2018: ACS Omega
Gareth Clarke, Andrii Rogov, Sarah McCarthy, Luigi Bonacina, Yurii Gun'ko, Christine Galez, Ronan Le Dantec, Yuri Volkov, Yannick Mugnier, Adriele Prina-Mello
We present two new synthetic routes for bismuth ferrite harmonic nanoparticles (BiFeO3 HNPs). Both phase-pure and mixed phase BiFeO3 materials were produced after improvement of the solvent evaporation and sol-gel combustion routes. Metal nitrates with a series of dicarboxylic acids (tartronic, tartaric and mucic) were used to promote crystallization. We found that the longer the carbon backbone with a hydroxyl group attached to each carbon, the lower the annealing temperature. We also demonstrate that nanocrystals more readily formed at a given temperature by adding glycerol but to the detriment of phase purity, whereas addition of NaCl in excess with mucic acid promotes the formation of phase-pure, monocrystalline nanoparticles...
July 11, 2018: Scientific Reports
Lu You, Fan Zheng, Liang Fang, Yang Zhou, Liang Z Tan, Zeyu Zhang, Guohong Ma, Daniel Schmidt, Andrivo Rusydi, Le Wang, Lei Chang, Andrew M Rappe, Junling Wang
Ferroelectric materials for photovoltaics have sparked great interest because of their switchable photoelectric responses and above-bandgap photovoltages that violate conventional photovoltaic theory. However, their relatively low photocurrent and power conversion efficiency limit their potential application in solar cells. To improve performance, conventional strategies focus mainly on narrowing the bandgap to better match the solar spectrum, leaving the fundamental connection between polar order and photovoltaic effect largely overlooked...
July 2018: Science Advances
Hyeon Han, Donghoon Kim, Sangmin Chae, Jucheol Park, Sang Yeol Nam, Mingi Choi, Kijung Yong, Hyo Jung Kim, Junwoo Son, Hyun Myung Jang
Ferroelectric photovoltaics (FPVs) have drawn much attention owing to their high stability, environmental safety, and anomalously high photovoltages, coupled with reversibly switchable photovoltaic responses. However, FPVs suffer from extremely low photocurrents, which is primarily due to their wide band gaps. Here, we present a new class of FPVs by demonstrating switchable ferroelectric photovoltaic effects and narrow band-gap properties using hexagonal ferrite (h-RFeO3) thin films, where R denotes rare-earth ions...
July 13, 2018: Nanoscale
Junxiang Yao, Xiao Song, Xingsen Gao, Guo Tian, Peilian Li, Hua Fan, Zhifeng Huang, Wenda Yang, Deyang Chen, Zhen Fan, Min Zeng, Jun-Ming Liu
Electrically driven magnetic switching (EDMS) is highly demanded for next-generation advanced memories or spintronic devices. The key challenge is to achieve repeatable and reversible EDMS at sufficiently small scale. In this work, we reported an experimental realization of room-temperature, electrically driven, reversible, and robust 120° magnetic state rotation in nanoscale multiferroic heterostructures consisting of a triangular Co nanomagnet array on tetragonal BiFeO3 films, which can be directly monitored by magnetic force microscope (MFM) imaging...
July 24, 2018: ACS Nano
Ran Tao, Changlu Shao, Xinghua Li, Xiaowei Li, Shuai Liu, Shu Yang, Chengcheng Zhao, Yichun Liu
Uniform Bi2 MoO6 nanosheets were grown in a high dispersed fashion on electrospun BiFeO3 nanofibers via a solvothermal technique. The loading amount of Bi2 MoO6 in the Bi2 MoO6 /BiFeO3 heterojunction nanofibers could be controlled by adjusting the precursor concentrations in the solvothermal process. The XPS analysis, energy band position calculation and trapping experiments all proved that the Bi2 MoO6 /BiFeO3 heterojunction is a Z-scheme heterojunction. The Z-scheme Bi2 MoO6 /BiFeO3 heterojunction had a much higher photocatalytic activity in the visible-light photodegradation of Rhodamine B (RhB) and tetracycline hydrochloride (TC) than pure BiFeO3 nanofibers or pure Bi2 MoO6 nanosheets...
November 1, 2018: Journal of Colloid and Interface Science
Hajime Hojo, Kengo Oka, Keisuke Shimizu, Hajime Yamamoto, Ryo Kawabe, Masaki Azuma
Bismuth ferrite (BiFeO3 ) is the most widely studied multiferroic material with robust ferroelectricity and antiferromagnetic ordering at room temperature. One of the possible device applications of this material is one that utilizes the ferroelectric/piezoelectric property itself such as ferroelectric memory components, actuators, and so on. Other applications are more challenging and make full use of its multiferroic property to realize novel spintronics and magnetic memory devices, which can be addressed electrically as well as magnetically...
June 19, 2018: Advanced Materials
Azimeh Rajaee, Xie Wensheng, Lingyun Zhao, Shi Wang, Yaqiang Liu, Zhaoxia Wu, Junjie Wang, Feng Si-Shen
Recently bismuth-based nanoparticles have drawn extensive attention as radiosensitizer in radiotherapy due to high atomic number, low toxicity, and low cost. This study aims to introduce the applicability of bismuth ferrite nanoparticles (BFO, BiFeO3) as a new multifunctional theranostic agent for radiotherapy, magnetic resonance imaging (MRI), and computed tomography (CT) as well as magnetic hyperthermia mediator. After evaluation of BFO nanoparticles biocompatibility which were synthesized by conventional sol-gel method, we investigated dose enhancement property of BFO nanoparticles with gel dosimetry, clonogenic, and cck8 assay...
June 1, 2018: Journal of Biomedical Nanotechnology
José-Luis Ortiz-Quiñonez, Umapada Pal, Martin Salazar Villanueva
Fabrication of phase-pure well-crystalline BiFeO3 submicroparticles in large scale is of great importance for the utilization of this rhombohedrally distorted perovskite material in applications such as memory storage and spintronic devices and visible photocatalyst for the degradation of organic pollutants. In fact, because of the narrow temperature range of phase stabilization, the fabrication of phase-pure BiFeO3 in large scale remained elusive. We present the synthesis of phase-pure BiFeO3 particles of submicrometric dimensions (246-330 nm average size) through the adjustment of oxidizing/reducing agent ratio in solution combustion process utilizing glycine as reducing agent and nitrate precursors as oxidizing agent...
May 21, 2018: Inorganic Chemistry
Jia Qi, Nan Ma, Xiaochen Ma, Rainer Adelung, Ya Yang
Ferroelectric materials can be utilized for fabricating photodetectors because of the photovoltaic effect. Enhancing the photovoltaic performance of ferroelectric materials is still a challenge. Here, a self-powered ultraviolet (UV) photodetector is designed based on the ferroelectric BiFeO3 (BFO) material, exhibiting a high current/voltage response to 365 nm light in heating/cooling states. The photovoltaic performance of the BFO-based device can be well modulated by applying different temperature variations, where the output current and voltage can be enhanced by 60 and 75% in heating and cooling states, respectively...
April 25, 2018: ACS Applied Materials & Interfaces
Jinpei Lin, Zeping Guo, Mei Li, Qing Lin, Kangling Huang, Yun He
BACKGROUND: A multiferroic material can simultaneously show two or more basic magnetic properties, including ferromagnetism, antiferromagnetism, and ferroelectricity. BiFeO3 is a multiferroic material with a rhombohedral distorted perovskite structure. Doping can reduce the volatility of Bi and greatly improve the magnetoelectric properties of BiFeO3 . METHODS: To investigate the influence of the doping content we used the following analytical methods: X-ray powder diffraction (XRD), scanning electron microscopy (SEM), microwave network analysis (PNA-N5244A), and the Superconducting Quantum Interference Device (Quantum Design MPMS) test...
January 2018: Journal of Applied Biomaterials & Functional Materials
Abdullah Alsubaie, Pankaj Sharma, Jin Hong Lee, Jeong Yong Kim, Chan-Ho Yang, Jan Seidel
We investigate the effect of variable uniaxial tensile strain on the evolution of 71° ferroelastic domains in (001)-oriented epitaxial BiFeO3 (BFO) thin films using piezoresponse force microscopy (PFM). For this purpose, a newly designed bending stage has been employed, which allows tensile bending as wells as in situ PFM characterization. In situ PFM imaging reveals polarization-strain correlations at the nanoscale. Specifically, ferroelastic domains with in-plane polarization along the direction of applied tensile strain expand, whereas the adjoining domains with orthogonal in-plane polarization contract...
April 11, 2018: ACS Applied Materials & Interfaces
Hua-Ding Song, Yan-Fei Wu, Xin Yang, Zhaohui Ren, Xiaoxing Ke, Mert Kurttepeli, Gustaaf Van Tendeloo, Dameng Liu, Han-Chun Wu, Baoming Yan, Xiaosong Wu, Chun-Gang Duan, Gaorong Han, Zhi-Min Liao, Dapeng Yu
Graphene, having all atoms on its surface, is favorable to extend the functions by introducing the spin-orbit coupling and magnetism through proximity effect. Here, we report the tunable interfacial exchange field produced by proximity coupling in graphene/BiFeO3 heterostructures. The exchange field has a notable dependence with external magnetic field, and it is much larger under negative magnetic field than that under positive magnetic field. For negative external magnetic field, interfacial exchange coupling gives rise to evident spin splitting for N ≠ 0 Landau levels and a quantum Hall metal state for N = 0 Landau level...
April 11, 2018: Nano Letters
Sung Min Park, Bo Wang, Saikat Das, Seung Chul Chae, Jin-Seok Chung, Jong-Gul Yoon, Long-Qing Chen, Sang Mo Yang, Tae Won Noh
Flexoelectricity is an electromechanical coupling between electrical polarization and a strain gradient 1 that enables mechanical manipulation of polarization without applying an electrical bias2,3 . Recently, flexoelectricity was directly demonstrated by mechanically switching the out-of-plane polarization of a uniaxial system with a scanning probe microscope tip3,4 . However, the successful application of flexoelectricity in low-symmetry multiaxial ferroelectrics and therefore active manipulation of multiple domains via flexoelectricity have not yet been achieved...
May 2018: Nature Nanotechnology
Johanna K Jochum, Michael Lorenz, Haraldur P Gunnlaugsson, Christian Patzig, Thomas Höche, Marius Grundmann, André Vantomme, Kristiaan Temst, Margriet J Van Bael, Vera Lazenka
Correlations were established between the hyperfine field distribution around the Fe atoms, the multiferroic properties, and the high magnetoelectric coefficient in BaTiO3 -BiFeO3 multilayer stacks with variable BiFeO3 single layer thickness, down to 5 nm. Of key importance in this study was the deposition of 57 Fe - enriched BiFeO3 , which enhances the sensitivity of conversion electron Mössbauer spectroscopy by orders of magnitude. The magnetoelectric coefficient αME reaches a maximum of 60.2 V cm-1 Oe-1 at 300 K and at a DC bias field of 2 Tesla for a sample of 15 × (10 nm BaTiO3 -5 nm BiFeO3 ) and is one of the highest values reported so far...
March 28, 2018: Nanoscale
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