Selective Photochromic Response to Low-Dose X-ray Radiation Detection in One-Dimensional Cadmium-Viologen Complexes.

Photochromic viologen-based materials have emerged as one of the most promising candidates for the development of X-ray light detection applications, including medical diagnosis and treatment, environmental radiation inspection, and industrial crack detection. However, the design and construction of low-dose X-ray-sensitive complexes remains an immense challenge, especially for the in-depth dissection of their response mechanisms. Herein, by using ,'-4,4'-bipyridiniodipropionate (CV) as functional sensitive structural units and cadmium as heavy atoms, two cadmium-viologen complexes with one-dimensional chained structures, namely, [CdCl(CV)(HO)] () and [CdBr(CV)] (), have been constructed, which exhibit a remarkable and selective photochromic response to low-dose X-ray radiation detection.

A tetraphenylethene-based Schiff base AIEgen with a large Stokes shift as probe for highly sensitive and selective detection of aqueous Cu ions and its application in cell imaging.

In this work, an AIE-active tetraphenylethene-based Schiff base fluorescent probe 3 with a large Stokes shift (247 nm) was designed and synthesized. It was found that the aggregated probe 3 exhibited very high selectivity and anti-interference ability for Cu in PBS buffer (70% f) through a fluorescence "turn-off" strategy. Job's plot and NMR analysis indicated the two phenolic hydroxyl groups of the benzene ring and the N atom (-CH=N-) on probe 3 interacted with Cu ions in a 1:1 stoichiometric ratio.

Boosting Electrical Response toward Trace Volatile Organic Compounds Molecules via Pulsed Temperature Modulation of Pt Anchored WO Chemiresistor.

Insufficient limit of detection (LoD) toward volatile organic compounds (VOCs) hinders the promising applications of metal oxide chemiresistors in emerging air quality monitoring and/or breath analysis. There is an inherent limitation of widely adopted strategies of creating sensitive chemiresistors then operating at the optimized temperature via a continuous heating (CH) mode. Herein, a strategy combining Pt single atoms anchoring (chemical sensitization) with pulsed temperature modulation (PTM, physical sensitization) is proposed.

Dimensionality control of magnetic coupling at interfaces of cuprate-manganite superlattices.

The dimensionality of the crystal structure plays a vital role in artificial heterostructures composed of different transition metal oxides. Nonlinear layer-thickness dependence of the exchange bias effect was observed in high-quality SrCuO/LaSrMnO (LSMO) superlattices induced in the present work by dimensional evolution. In the SCO()/LSMO(8) superlattices with thickness below the critical value (5 u.

Layer-dependent ferroelectricity in 2H-stacked few-layer α-InSe.

Atomically thin two-dimensional (2D) van der Waals materials have exhibited many exotic layer-dependent physical properties including electronic structure, magnetic order, etc. Here, we report a striking even-odd layer dependent oscillation in the ferroelectric polarization of 2H-stacked few-layer α-InSe nanoflakes. As characterized by piezoresponse force microscopy (PFM), when the in-plane (IP) electric polarization of 2H-stacked α-InSe films is electrically aligned, the out-of-plane (OOP) polarization of the odd-layer (OL) samples is obviously larger than that of the even-layer (EL) ones.

Magnetic covalent organic framework nanocomposites as a new adsorbent for the determination of polycyclic aromatic hydrocarbons in water and food samples.

A magnetic covalent organic framework nanocomposite (FeO@COF(Tp-NDA)) was synthesized via a solvothermal method, used as a magnetic adsorbent for the extraction of polycyclic aromatic hydrocarbons (PAHs) from lake water, tea, coffee, and fried chicken, and detected using a high performance liquid chromatography-ultraviolet detector. The synthesized magnetic adsorbent was characterized via transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, N adsorption-desorption isotherm analysis and vibrating sample magnetometry. Parameters that affected the extraction conditions and desorption conditions were optimized.

Nanoscale Magnetization Reversal by Magnetoelectric Coupling Effect in GaFeO Multiferroic Thin Films.

The control of magnetism by electric means in single-phase multiferroic materials is highly desirable for the realization of next-generation magnetoelectric (ME) multifunctional devices. Nevertheless, most of these materials reveal either low working temperature or antiferromagnetic nature, which severely limits the practical applications. Herein, we selected room-temperature multiferroic GaFeO (GFO) with ferrimagnetism to study electric-field-induced nanoscale magnetic domain reversal.

Use of a magnetic covalent organic framework material with a large specific surface area as an effective adsorbent for the extraction and determination of six fluoroquinolone antibiotics by HPLC in milk sample.

A magnetic covalent organic framework material was synthesized with a core-shell structure using a simple solvothermal method. It was prepared with Fe O as the magnetic core, covalent organic framework as the shell, which synthesized from 1,3,5-triformylphloroglucinol and p-phenylenediamine by Schiff base reaction. Transmission electron microscopy, Fourier transform infrared spectroscopy, powder X-ray diffraction, vibrating sample magnetometry, and nitrogen adsorption-desorption were used to characterize magnetic adsorbent.

Significant tunneling magnetoresistance and excellent spin filtering effect in CrI-based van der Waals magnetic tunnel junctions.

van der Waals (vdW) heterojunctions stacked by different two-dimensional (2D) layered materials not only exhibit the complementary effect of short plates, but also harbor novel physical phenomena. In particular, the emergence of 2D magnetic vdW materials has provided novel opportunities for the application of these materials in spintronics. However, to the best of our knowledge, to date, the spin-related transport mechanism in magnetic tunnel junctions (MTJs) based on these 2D vdW magnetic materials and the effect of pinning layers on their transport properties have not been elucidated by the non-equilibrium state theory.

Solution Synthesis of Layered van der Waals (vdW) Ferromagnetic CrGeTe Nanosheets from a Non-vdW CrTeTemplate.

CrGeTe has recently emerged as a new class of two-dimensional (2D) materials due to its intrinsic long-range ferromagnetic order. However, almost all the reported synthesis methods for CrGeTe nanosheets are based on the conventional mechanical exfoliation from single-crystalline CrGeTe, which is prepared by the complicated self-flux technique. Here we report a solution-processed synthesis of CrGeTe nanosheets from a non-van der Waals (vdW) CrTe template.

One-step electrodeposition of AuNi nanodendrite arrays as photoelectrochemical biosensors for glucose and hydrogen peroxide detection.

A novel nonsemiconductor photoelectrochemical biosensor was first constructed using the unique plasmonic AuNi nanodendrite arrays. The AuNi nanodendrite arrays were rapidly prepared by a one-step electrodeposition method using the porous anodic aluminum templates. Owing to its hierarchical structure with abundant active sites, the synergistic catalytic of Au and Ni can be better exploited.

Interfacial Ferromagnetic Coupling and Positive Spontaneous Exchange Bias in SrFeO/LaSrMnO Bilayers.

Negative exchange bias is usually discovered in ferromagnetic (FM)/antiferromagnetic (AFM) heterostructures after a field-cooling (FC) process. Relatively, positive exchange bias (PEB) is a rarely observed phenomenon. So far, almost all of the models for PEB whether undergoing FC or zero-field-cooling (ZFC) treatment have been explained by an interaction of strong AFM coupling at the interface.

Room temperature ferromagnetism in metallic Ti V O thin films.

Transition metal doped TiO diluted magnetic semiconductors have attracted considerable interest due to their room temperature ferromagnetism. However, most TiO films are highly insulating, and thus the magnetic properties can not be controlled by tuning the carrier concentration. This will limit their application in controlling magnetization electrical gating.

Ferromagnetic CrTe nanorods with ultrahigh coercivity.

Ferromagnetic Cr2Te3 nanorods were synthesized by a one-pot high-temperature organic-solution-phase method. The crystalline phases and magnetic properties can be systematically tuned by varying the molar ratio of the Cr and Te precursors. A magnetically hard phase, identified as chemically ordered Cr2Te3, is the dominating one at the precursor ratio between Cr : Te = 1 : 1.

Surface plasmon aided high sensitive non-enzymatic glucose sensor using Au/NiAu multilayered nanowire arrays.

A novel plasmon aided non-enzymatic glucose sensor was first constructed based on the unique half-rough Au/NiAu multilayered nanowire arrays. These multilayered and half-rough nanowires provide high chemical activity and large surface area for glucose oxidation in an alkaline solution. Under visible light irradiation, the surface plasmons originated from Au part enhance the electron transfer in the vertically aligned nanowires, leading to high sensitivity and wide detection range.

The dramatic enhancement of ferromagnetism and band gap in Fe-doped InO nanodot arrays.

Ordered Fe-doped InO nanodot arrays with diameters between 35 nm and 80 nm are fabricated using pulsed laser deposition with the aid of ultrathin porous anodized aluminumoxide templates. The 5 at.% Fe doped InO nanodot arrays are shown to consist of the cubic bixbyite structure of InO.

Novel magnetic g-CN/α-FeO/FeO composite for the very effective visible-light-Fenton degradation of Orange II.

A novel magnetic heterogeneous g-CN/α-FeO/FeO catalyst was successfully synthesized through a simple hydrothermal method. The structure, morphology, and optical properties of the catalyst were characterized. The photocatalytic activity of the heterogeneous g-CN/α-FeO/FeO catalyst for the photo-Fenton degradation of Orange II in the presence of HO irradiated with visible light ( > 420 nm) at neutral pH was evaluated.

Exchange Bias Effect and Orbital Reconstruction in (001)-Oriented LaMnO/LaNiO Superlattices.

Paramagnetic LaNiO (LNO)-based heterostructures have been attracting the attention of researches, especially since the interesting exchange bias (EB) effect has been observed in (111)-oriented LaMnO (LMO)/LNO superlattices (SLs). However, this effect is not expected to occur in the (001) direction SLs. In this paper, we report the observation of an unexpected EB effect in (001)-oriented (LMO)/(LNO) SLs.

The Exchange Bias of LaMnO/LaNiO Superlattices Grown along Different Orientations.

With the goal of observing and explaining the unexpected exchange bias effect in paramagnetic LaNiO-based superlattices, a wide range of theoretical and experimental research has been published. Within the scope of this work, we have grown high-quality epitaxial LaMnO(n)-LaNiO(n) (LMO/LNO) superlattices (SLs) along (001)-, (110)-, and (111)-oriented SrTiO substrates. The exchange bias effect is observed in all cases, regardless of growth orientation of the LMO/LNO SLs.

Corn-like, recoverable γ-FeO@SiO@TiO photocatalyst induced by magnetic dipole interactions.

Corn-like, γ-FeO@SiO@TiO core/shell heterostructures were synthesized by a modified solvothermal reduction combined with a sol-gel method. SiO shells were first deposited on monodisperse FeO microspheres by a sol-gel method. FeO@SiO@TiO corn-like heterostructures were then obtained by sequential TiO coating, during which the magnetic dipolar interactions induced the anisotropic self-assembly process.