Mesoporous carbon capsules encapsulated with Fe3O4 nanoparticles were prepared by the successive coating of a silica layer and subsequent mesoporous silica/carbon on surface followed chemical etching NaOH solution. TEM observations show that as-obtained samples had rattle-like structure: in interior capsules. The typical nitrogen adsorption/desorption results demonstrate specific area for as-prepared is up to 1570 m2 g−1, total pore volume about 3.02 cm3 g−1. porous wall structure lateral...

Semiconductor ZnO nanotube arrays have been synthesized by direct electrochemical deposition from aqueous solutions into porous anodic alumina membranes. Scanning electron microscopy and transmission indicate that large-area highly ordered obtained. X-ray diffraction selected-area analyses show the as-synthesized nanotubes are polycrystalline. Photoluminescence spectra of a violet peak blue centered at 414 464 nm, respectively. The polycrystalline may find potential applications in...

Flexible artificial nociceptors and pressure sensory alarm system were fabricated using a memristor based on biopolymers extracted from the seaweed.

Herein, we demonstrate the design and fabrication of well-defined triple-shelled Ag@Fe3O4@SiO2@TiO2 nanospheres with burr-shaped hierarchical structures, in which multiple distinct functional components are integrated wonderfully into a single nanostructure. In comparison commercial TiO2 (P25), pure microspheres, Fe3O4@SiO2@TiO2 annealed nanocomposites, as-obtained amorphous exhibit markedly enhanced visible light or sunlight photocatalytic activity towards photodegradation methylene blue...

Memristors based on two-dimensional (2D) materials can exhibit great scalability and ultralow power consumption, yet the structural thickness inhomogeneity of ultrathin electrolytes lowers production yield reliability devices. Here, we report that self-limiting amorphous SiOx (∼2.7 nm) provides a perfect atomically thin electrolyte with high uniformity, featuring record yield. With guidance physical modeling, reveal atomic enables anomalous resistive switching transition to an analog...

Silicon-based photodetectors are important optoelectronic devices in many fields. Many investigations have been conducted to improve the performance of silicon-based photodetectors, such as spectral responsivity and sensitivity ultraviolet band. In this study, we combine surface structure engineering silicon with wide-bandgap semiconductor SnO2 films realize textured Si-based heterojunction photodetectors. The obtained SnO2/T-Si exhibit high ranging from near-infrared light. Under a bias...

Two-dimensional transition metal dichalcogenides (2DTMDs) and their van der Waals heterojunctions (vdWHs) have garnered significant attention working as the channel material of optoelectronics. The development new heterojunction growth schemes may also provide better performance for optoelectronic devices. In this paper, PtSe2 thin films with controllable size thickness are directly grown on MoS2 nanosheet by sputtering-selenization two-step method. photodetector PtSe2/MoS2 exhibits a type-I...

A very simple protocol, which involves the chemical reduction of AgNO3 and Fe(NO3)3 with ethylene glycol as reducing agent, has been developed for synthesizing Ag@Fe3O4 core/shell nanostructures in silver nanoparticle core was covered by a thicker layer Fe3O4 shell. The obtained simultaneously possess both strong magnetic responsiveness tunable plasmonic properties. properties composite nanospheres are profoundly influenced high dielectric constant outer shell could be conveniently modulated...

Generation of an intermediate band state in amorphous TiO₂ by ultraviolet pulsed laser ablation water.

Memristive synapses from biomaterials are promising for building flexible and implantable artificial neuromorphic systems due to their remarkable mechanical biological properties. However, these devices have relatively poor memristive switching characteristics, thus fail meet the requirement of networks high learning accuracy. Here, based on carrageenan nanocomposites that possess desirable characteristics demonstrated. These show highly reproducible analog resistive behaviors with 250...

Abstract We report a simple method, oblique angle deposition, to directly synthesize aligned Ge nanowire arrays on Si substrate. This process is accomplished by tilting the substrate and adjusting incident of evaporated vapor flux with respect normal 87°. The resultant crystallinity nanostructures can be tuned either amorphous or poly‐ single‐crystalline, depending temperature evaporation rate. effects thermal treatment morphology structure nanowires are discussed in detail. field‐emission...

Inorganic perovskite has attracted great interest due to its excellent optoelectronic properties. There are much less low band gap halide semiconductors, and CsPbCl 3 is one of a wide semiconductor in the family. In this study, 0.5-mm single crystal with tetragonal structure direct 2.86 ± 0.3 eV synthesized by flash evaporation CsCl-PbCl 2 solution. An ultraviolet photodetector based on fabricated, showing photoresponse wavelength range 280–435 nm, maximum responsivity 0.272 A/W at 410 nm....

Many Zintl phases are promising thermoelectric materials owning to their features like narrow band gaps, multiband behaviors, ideal charge transport tunnels, and loosely bound cations. Herein we show a new phase NaCdSb with exceptional intrinsic performance. Pristine exhibits semiconductor behaviors an experimental hole concentration of 2.9×1018 cm-3 calculated gap 0.5 eV. As the temperature increases, rises gradually approaches its optimal one, leading high power factor 11.56 μW cm-1 K-2 at...

All inorganic perovskite nanocrystals (NCs) have emerged as versatile materials for gas sensing due to their tunable optical properties and high surface-to-volume ratios. However, CsPbCl3 has limitations when it comes sensing. In this study, we explore the potential of Mn2+-doped NCs a room-temperature platform ammonia (NH3) detection. By incorporating Mn2+ dopants into lattice, enhance sensitivity NH3 gas. Additionally, molecules interact with NCs, leading dynamic passivation Cl– vacancies....

Fe3+-doped MgGa2O4 (MGO: Fe3+) spinel-type phosphors are promising near-infrared (NIR) luminescent materials because of its non-toxic, good thermal stability and adjustable emission. Unfortunately, the existence detrimental oxygen defects in host lead to unsatisfactory luminescence efficiency. In this study, an vacancy repairing engineering has been innovatively developed via Li+ substitution MGO: Fe3+ for significantly enhancing NIR emission 709 nm maintaining outstanding stability. The...

Organic carbon dots (CDs) exhibit tunable electronic structures and exceptional optical properties, supporting both exciton- charge-driven applications. However, the mechanisms underlying this dual functionality are poorly understood. This study establishes role of size inhomogeneity in exciton dissociation for first time. Two distinct CD types were identified, each class with a deviation. Intradot relaxation within same type CDs composes fast (∼1 ps) slow (∼tens picoseconds) component among...

As one of the commonly used methods for surface passivation semiconductors, a heterostructure method was developed in this work to passivate traps CsPbBr3 single crystals (SCs), and further, correlated with carrier recombination processes. Herein, processes bare [MAPbCl3]0.34[CsPbBr3]0.66-covered SCs were studied using time-resolved spectroscopic techniques, including steady-state photoluminescence (TRPL) spectroscopy microwave photoconductivity (TRMC). By comparing kinetics TRPL TRMC, we...

Bifunctional magnetic−luminescent Fe3O4@SiO2/Y2O3:Tb nanocomposite was obtained by assembling Y2O3:Tb nanorods onto the surface of Fe3O4@SiO2 core−shell nanostructures. Transmission electron microscopy, energy dispersive X-rays (EDX), room temperature photoluminescence spectra, and superconducting quantum interference device magnetometry were used to investigate morphology properties nanocomposite. The results showed that displayed a strong green emission superparamagnetic behavior at...

Graphene-based flexible electronic devices are widely used in photoelectric components and photodetectors. However, it remains a huge challenge to fabricate graphene-based efficiently economically. Compared with the made by combining film metal semiconductor materials, substrate (GFS) can be conveniently induced laser direct writing on film. In this paper, GFS resistance of as low 15 Ω was successfully CO2 polyimide (PI) one step, surface covered carbon nanoparticles (GFSC) 25 further...

The ultraviolet (UV) photodetectors have significant applications different fields. High detectivity, high responsivity and wide active area are required to probe a weak UV light in actual ambient. Unfortunately, most practical photoconductors based on bandgap semiconductor films can hardly both low dark current density. In this study, the intermediate band engineering has been proposed try solve problem. BixSn1-xO2 (0.017 < x 0.041) show detectivity of 6.1 × 1015 Jones at 280 nm quantum...

The recent discovery of memristive devices based on two-dimensional materials have attracted much interest for emerging applications flexible memory, neuromorphic computing, and so forth. Reducing the thickness to a single-layer level would prompt scaling limit sub-nanometer. However, monolayer vertical generally suffer inferior performance with high operating voltage, large leakage currents, poor reliability. In this study, an interfacial polymer layer is inserted between hexagonal boron...

Perovskite nanocrystals (NCs) feature adjustable bandgap, wide absorption range, and great color purity for robust perovskite optoelectronic applications. Nevertheless, the absence of lasting stability under continues energization, is still a major hurdle to widespread use NCs in commercial In particular, reactivity red-emitting perovskites environmental surroundings more sensitive than that their green counterparts. Here, we present simple synthesis ultrathin ZrO2coated, Sr2+doped...