Article
Materials Science, Multidisciplinary
Ying Wang, Jiarong Yao, Shuaishuai Ding, Siyu Guo, Dapeng Cui, Xinyue Wang, Shuyuan Yang, Lijuan Zhang, Xinzi Tian, Di Wu, Chao Jin, Rongjin Li, Wenping Hu
Summary: Research on organic single crystals grown on a liquid substrate and used to construct single-crystalline OSVs revealed high magnetoresistance responses and spin transport properties. A magnetoresistance value as high as 17% was measured with an intermediate layer thickness of 269 nm. Spin transport was observed in single crystals up to a thickness of 457 nm, much larger than that of polycrystalline thin films.
SCIENCE CHINA-MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Xitong Liu, Hao Li, Weifeng Zhang, Zhen Yang, Dong Li, Mengya Liu, Kuijuan Jin, Liping Wang, Gui Yu
Summary: Covalent organic frameworks (COFs) have made significant progress in their application to optoelectronic devices such as field-effect transistors, memristors, and photodetectors. This study demonstrates the synthesis of a COF film through acid exfoliation and its successful application in organic spin valves, providing promising prospects for future electronic and spintronic devices.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Dong Li, Yuanhui Zheng, Mingwei Yang, Congyuan Wei, Xitong Liu, Naihang Zheng, Weifeng Zhang, Kuijuan Jin, Gui Yu
Summary: The organic interlayer in organic spin valves plays a crucial role in device performance. In this study, conjugated polymers based on isoindigo derivatives were used to fabricate organic spin valves, and the dependence of performance on polymer structure was investigated.
ACS MATERIALS LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Xin He, Chenhui Zhang, Dongxing Zheng, Peng Li, John Q. Xiao, Xixiang Zhang
Summary: With the recent advancements in two-dimensional ferromagnets, it is now feasible to develop high-quality all-2D spintronic devices. In this study, nonlocal spin valves were successfully fabricated using Fe3GeTe2 as the spin source and detector and multilayer graphene as the spin transport channel. The spin transport signal strongly depended on temperature and vanished below the Curie temperature of the Fe3GeTe2 flakes. Our results suggest potential applications of van der Waals heterostructures in spintronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Huayan Xia, Sangjian Zhang, Hao Li, Tianli Li, Fang Liu, Wenchao Zhang, Wang Guo, Tian Miao, Wenjie Hu, Jian Shen, Yongli Gao, Junliang Yang, Mei Fang
Summary: This study investigates the effects of temperature, bias voltage, and direction of magnetic field on the magnetoresistance (MR) of vertical organic spin valve (OSV) devices, revealing the mechanisms and proposing a domain-switch model to simulate resistance changes. The research provides a new route to tune the MR in organic spintronic devices, which is significant for future functional device applications.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Yanfei Zhu, Lidan Guo, Jun Guo, Luyang Zhao, Chunyan Li, Xueying Qiu, Yang Qin, Xianrong Gu, Xiangnan Sun, Zhiyong Tang
Summary: Quantum-confined atomically precise metal nanoclusters (MNCs) are a new type of inorganic-organic hybrid semiconductor that have been widely used in chemical sensing, optical imaging, biomedicine and catalysis. Researchers have successfully designed and fabricated a spin valve (SV) based on MNCs, demonstrating remarkable magnetoresistance values and the ability to change the spin-dependent transport properties by altering the atomic structure of the MNCs.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Xueli Yang, Ankang Guo, Lidan Guo, Yunqi Liu, Xiangnan Sun, Yunlong Guo
Summary: This article summarizes the basic operating principle and mechanism of organic spin valves (OSVs) and discusses the importance of accomplishing room-temperature spin transport, FM electrode selection, and spinterface. The state-of-the-art progress of organic semiconductors (OSCs) with room-temperature spin transport in spin valves is reviewed. Furthermore, the effects of carrier mobility and spin relaxation time on the spin diffusion length are systematically analyzed. A feasible perspective for improving the spin transport properties of OSCs is presented.
ACS MATERIALS LETTERS
(2022)
Article
Multidisciplinary Sciences
Yuwaraj Adhikari, Tianhan Liu, Hailong Wang, Zhenqi Hua, Haoyang Liu, Eric Lochner, Pedro Schlottmann, Binghai Yan, Jianhua Zhao, Peng Xiong
Summary: Chirality is a significant property in physics, chemistry, and biology. A recent study found that electrons become spin polarized after passing through chiral molecules, leading to chirality-induced spin selectivity. In this research, the role of spin-orbit coupling (SOC) in the metal electrode for the CISS spin valve effect was investigated through magnetoconductance measurements on magnetic semiconductor-based chiral molecular spin valves with normal metal electrodes of contrasting SOC strengths. The results highlight the essential role of SOC in converting the orbital polarization induced by the chiral molecular structure to spin polarization.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Wenchao Sun, Lidan Guo, Shunhua Hu, Xiangwei Zhu, Xiaotao Zhang, Wenping Hu, Xiangnan Sun
Summary: Organic semiconductors with long spin relaxation time have attracted wide interest in the field of organic spintronics, but the issue of ill-defined layers at the interface during device fabrication process calls for reliable organic spin valves. Various reliable spin valve preparation methods have been developed to address this challenge.
ORGANIC ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Dongxue Yu, Shuaishuai Ding, Jing Li, Wenbo Mi, Yuan Tian, Wenping Hu
Summary: This study reports for the first time the use of molecular doping as an effective strategy to enhance conductivity and modify spinterface in vertical OSV devices, showing a significant improvement in both conductivity and magnetoresistance ratio. The doping of F(4)TCNQ in the form of free radicals creates a spin-dependent hybrid interfacial state (SDHIS) which exhibits an extra interface magnetoresistance (IMR) effect on top of the standard giant magnetoresistance (GMR) effect.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Nanoscience & Nanotechnology
B. Kaiser, J. Ramberger, J. D. Watts, J. Dewey, Y. Zhang, C. Leighton
Summary: In order to increase the spin signal, we integrated high-spin-polarization Co-Fe alloy ferromagnetic injectors and detectors into Al-based non-local spin valves. Smooth, polycrystalline (110-textured), solid-solution body-centered-cubic Co75Fe25 films were generated by room-temperature deposition on amorphous substrates from an alloy target, characterized by various techniques. Integration into transparent-interface Al non-local spin valves resulted in a similar to 5-fold enhancement of the spin signal relative to Co, with temperature-independent current spin polarizations exceeding 60%. Comparisons with prior literature show that Co-Fe alloys offer a facile route to higher spin polarization and spin signals in non-local spin valves, with minimal barrier to adoption.
Review
Chemistry, Physical
Shuaishuai Ding, Yuan Tian, Wenping Hu
Summary: This article summarizes the recent progress in reliable fabrication and evaluation strategies for organic spin valves (OSVs), focusing on challenges such as protecting spin interface properties, optimizing device performance, addressing dead layer issues, and discussing general protocols for reliable evaluation of performance and identification of transport mechanisms. Key fundamentals leading to spurious magnetoresistance response are also highlighted, along with future perspectives on spintronic devices of organic materials.
Article
Chemistry, Physical
Qihong Wu, Rongkun Liu, Zhanjun Qiu, Dengfeng Li, Jie Li, Xiaotian Wang, Guangqian Ding
Summary: In this study, spintronic devices based on Cr3X4 (X = Se, Te) monolayers were designed and their spin transport properties were investigated. The Cr3Te4 monolayer showed spin filtering and a dual-spin diode effect, while the Cr3Se4 monolayer was an excellent platform for a spin valve. Interestingly, the Cr3Se4 monolayer based device also exhibited a negative differential resistance effect and a high magnetoresistance ratio. These findings highlight the potential of Cr3X4 (X = Se, Te) monolayers in spintronic applications and provide realistic materials for nanoscale spintronic devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Sumit Naskar, Vladimiro Mujica, Carmen Herrmann
Summary: Electrons moving through chiral molecules are selectively influenced by their spin orientation and the helicity of the molecule in a phenomenon called chiral-induced spin selectivity (CISS). In this study, carbon helices connected to gold electrodes were investigated using a non-equilibrium Green's function method, a Landauer approach, and density functional theory. It was found that the transmitted electrons exhibited spin polarization, which was also observed in the non-equilibrium electronic structure of the junctions. Although the spin polarization was small, its sign changed with the current direction and the handedness of the molecule. The use of computationally more expensive hybrid functionals may lead to larger spin polarization, suggesting that non-equilibrium spin polarization could be a key element in understanding the CISS mechanism.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
I Angervo, M. Saloaro, H. Palonen, H. Huhtinen, P. Paturi, T. Makela, S. Majumdar
Summary: We present the fabrication of the first organic spin valve device based on Sr2FeMoO6, using Tris(8-hydroxyquinolinato) aluminum as a spin transport layer. The device exhibits hysteric magnetoresistance with approximately 20%-30% switching between high and low resistance states at low temperatures. This study demonstrates the potential of organic semiconductors to form suitable interfaces with double perovskite Sr2FeMoO6 for efficient low temperature operation and improve room temperature performance in tunneling devices.
APPLIED SURFACE SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
F. Mortreuil, L. Boudou, K. Makasheva, G. Teyssedre, C. Villeneuve-Faure
Summary: The study focuses on the properties of plasma deposited SiOxNy dielectric layers at different thicknesses, finding that the thickness of the dielectric film affects the charging phenomena, but has a weak influence on the injected charge amount and decay dynamics.
Article
Chemistry, Physical
M. Mitronika, C. Villeneuve-Faure, F. Massol, L. Boudou, W. Ravisy, M. P. Besland, A. Goullet, M. Richard-Plouet
Summary: TixSi1-xO2 thin films were deposited using low pressure PECVD with tunable properties obtained by varying precursor flow rates. Surface chemical composition was analyzed by XPS, showing increased surface roughness with higher Titanium content. Electrical properties investigation at nanoscale revealed that a small amount of Titanium can improve dielectric permittivity and charge transport behavior.
APPLIED SURFACE SCIENCE
(2021)
Article
Microscopy
Guillaume Noircler, Fabien Lebreton, Etienne Drahi, Patricia de Coux, Benedicte Warot-Fonrose
Summary: This article describes the use of STEM-EELS methodology to investigate the composition of c-Si/a-AlOx interface, revealing the instability of a-AlOx under the electron-beam and proposing experimental improvements. The study found that the interface is mainly composed of a-SiOx and non-stoichiometric aluminum silicate.
Article
Chemistry, Multidisciplinary
Nagham Ibrahim, Chady Moussallem, Magali Allain, Olivier Segut, Frederic Gohier, Pierre Frere
Summary: Two series of linear extended benzofuran derivatives were prepared from benzaldehyde-lignocellulosic (Be series) or furaldehyde -saccharide (Fu series) platforms to investigate their emission and electrochemical properties. The Be series showed aggregation-induced emission effect and high fluorescence quantum yield in the solid state, while the Fu series exhibited higher fluorescence in solution. X-ray crystallography studies revealed differences in pi-pi stacking and lateral contacts for non-emissive and emissive compounds respectively. Organic field effect transistors with hole mobility were fabricated using the more extended derivative with a central furan cycle.
Article
Physics, Applied
M. Saadeh, Y. Aceta, P. Frere, B. Guiffard
Summary: Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) was utilized as a transducing material for mechanical-to-electrical conversion devices based on the flexoelectric-like response of the polymer. The addition of xylitol and post-treatment with ethanol and methanol significantly improved the flexoelectric coefficient, particularly when combined with a gold top electrode.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Romain Magnan, Richard Clergereaux, Christina Villeneuve-Faure, Benoit Lantin, Guillaume Carnide, Patrice Raynaud, Nicolas Naude
Summary: This study investigated the deposition processes of silica-like thin films using liquid droplet injection in an Atmospheric Pressure Plasma Jet (APPJ) operated in open air. The results showed that silica-like films could be formed without the addition of oxygen in the plasma phase, depending on the carrier gas flow rate. The deposition rate of the films ranged from 500 to 1400 nm.m.min(-1), and the film structure changed from silica-like to organosilicon layers for different flow rates. These changes were attributed to the interactions between plasma and droplets, droplet transport, liquid evaporation, and plasma polymerization.
EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
D. Yi, L. Peres, A. Pierrot, S. Cayez, R. Cours, B. Warot-Fonrose, C. Marcelot, P. Roblin, K. Soulantica, T. Blon
Summary: The organization of nano-objects on macroscopic surfaces is crucial for the advancement and application of nanotechnologies. This study demonstrates the growth and self-organization of metallic nanowires into hexagonal superlattices on surfaces, with the ability to tune the characteristic lengths depending on the stabilizing surfactants used.
Article
Chemistry, Applied
Nagham Ibrahim, Matthieu Loumaigne, Magali Allain, Pierre Frere
Summary: Two novel series of furan-cyanovinyl-phenyl derivatives, one monohalogenated (series I) and one dihalogenated (series II), were synthesized using Knoevenagel condensation. The presence of halogen atoms in the para position of the phenyl group was found to activate emission properties in the solid state, with different intermolecular interactions induced by halogen atoms in the two series. Additionally, compounds in series II showed an evolution in crystalline phase leading to a change in luminescence color from blue to yellow.
Article
Physics, Multidisciplinary
C. Gatel, R. Serra, K. Gruel, A. Masseboeuf, L. Chapuis, R. Cours, L. Zhang, B. Warot-Fonrose, M. J. Hytch
Summary: The metal-oxide-semiconductor (MOS) capacitor is a commonly used electronic component in integrated circuits. While efforts are being made to integrate new dielectric or ferroelectric materials, silicon dioxide on silicon remains the most prevalent material for capacitors. Surprisingly, the electric field within such capacitors at the nanoscale has never been measured or mapped out. This study presents the results from operando electron holography experiments, providing unprecedented sensitivity in measuring the electric potential across a working MOS nanocapacitor, and revealing unexpected charging of the dielectric material surrounding the electrodes.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Deliang Yi, Cecile Marcelot, Idaline Romana, Marine Tasse, Pier-Francesco Fazzini, Laurent Peres, Nicolas Ratel-Ramond, Philippe Decorse, Benedicte Warot-Fonrose, Guillaume Viau, Philippe Serp, Katerina Soulantica
Summary: 2D ultrathin metal nanostructures, such as Pt nanosheets, display unique physical and chemical properties that make them advantageous in catalysis. In this study, a selective synthesis method using defect engineering was employed to create Pt nanosheets with preserved planar defects. These nanosheets showed better stability and higher selectivity in phenylacetylene hydrogenation compared to a commercial Pt/C catalyst.
Article
Chemistry, Physical
Pamella Vasconcelos Borges Pinho, Alain Chartier, Denis Menut, Antoine Barbier, Myrtille O. J. Y. Hunault, Philippe Ohresser, Cecile Marcelot, Benedicte Warot-Fonrose, Frederic Miserque, Jean-Baptiste Moussy
Summary: A quantitative link between chromium content, Fe2+/Fe3+ site-occupation and macroscopic physical properties of Fe3-xCrxO4 thin films is established using spectroscopic measurements and theoretical simulations. It is found that increasing chromium content delays the transition of Fe3-xCrxO4 thin films from inverse to normal spinel configuration and promotes collinear spin structure. The unique cation distribution in these thin films favors electron hopping and results in a smaller electronic band gap.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Amr A. Nada, Maged F. Bekheet, Diane Samelor, Hugues Vergnes, Christina Villeneuve-Faure, Jim Cartier, Christophe Charmette, Sophie Tingry, Brigitte Caussat, Constantin Vahlas, Stephanie Roualdes
Summary: This study presents a novel photo-anode composed of TiO2 with preferred growth orientation [211] conjugated with PEDOT as bi-layers for photo-electrocatalytic water splitting. The TiO2 films with variable thickness of pure anatase dendritic structure were obtained by a dry process strategy, and the morphology evolved from dense and angular structures to isolated and nanostructured tree-like columns with the increase of film thickness. The PEDOT/TiO2 bi-layer with an overall thickness of 1350 nm and a 50 nm thick upper-PEDOT layer exhibited the highest photocurrent response, fast photocurrent response under illumination, and the best hydrogen yield.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Christina Villeneuve-Faure, Abdelhaq Boumaarouf, Vishal Shah, Peter M. Gammon, Ulrike Luders, Rosine Coq Germanicus
Summary: The anodic oxidation of silicon carbide (SiC) surface due to the formation of a water nanomeniscus during conductive atomic force microscopy (C-AFM) measurements is experimentally investigated. The presence of the water meniscus is probed and analyzed by AFM, and the water meniscus volume is found to increase significantly under polarization. An electrostatic modeling and finite element model are developed to study oxide growth and electric field distribution. The anodization occurs in the conductive regime and highly depends on the doping level of SiC. Furthermore, the local oxidation mechanism of SiC material in a MOSFET structure is examined.
Article
Nanoscience & Nanotechnology
Kremena Makasheva, Christina Villeneuve-Faure, Adriana Scarangella, Luca Montanari, Laurent Boudou, Gilbert Teyssedre
Summary: It has been discovered that introducing silver nanoparticles (AgNPs) into electrically insulating polymers can significantly enhance electroluminescent signals, lower the electric field threshold for light emission detection, and stabilize recorded spectra, thus improving the identification of characteristic luminescence peaks. Additionally, AgNPs have been found to be able to trap and eject charges, and adjust the energetics of charge carriers at the electrode/dielectric contact.
IEEE OPEN JOURNAL OF NANOTECHNOLOGY
(2023)
Article
Chemistry, Physical
Nagham Ibrahim, Matthieu Loumaigne, Jeremie Grolleau, Magali Allain, Pierre Frere
Summary: A small change in the molecular structure of cyanostilbene derivatives can significantly affect their luminescence properties, both in solution and in the solid state. By transferring the cyano group from the beta position to the alpha position in benzofuran-cyanovinyl-pentafluorophenyl derivatives, the emission properties can be strongly altered. The position isomer induced fluorescence regulation in solution, while the stacking modes between molecules affect the luminescence properties in the solid state.
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2022)
