A hydrothermal process has been used to synthesize manganese oxides of various crystalline structures and morphologies, such as α-, β-, γ-MnO2, MnOOH Mn3O4. The nanostructured materials were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission (TEM) high-resolution (HRTEM), Raman spectroscopy, photoelectron spectroscopy (XPS) hydrogen temperature-programmed reduction (H2-TPR) techniques. evolution mechanism converting β-MnO2 or α-MnO2 was studied....

Composites consisting of Fe(3)O(4) microspheres (FMS) and polyaniline (PANI), FMS/PANI, have been successfully prepared through a two-step oxidative polymerization aniline monomers in the presence microspheres. In our technique, Fe(3+) ammonium persulfate (APS) are used as oxidants each step. It is discovered that process plays dominant role morphology these composites: oligomers oxidized by mainly produced first stage, "egg-like" PANI aggregates obtained second stage. can be found embedding...

An economical corncob biochar-based magnetic iron-copper bimetallic nanomaterial (marked as MBC) was successfully synthesized and optimized through a co-precipitation pyrolysis method. It used to activate H2O2 remove ciprofloxacin (CIP) from aqueous solutions. This material had high catalytic activity structural stability. Additionally, it good properties, which can be easily separated In MBC/H2O2, the removal efficiency of CIP 93.6% within 360 min at optimal reaction conditions. The...

On-chip photonic systems play crucial roles in nanoscience and nanoapplications, but coupling external light to these subwavelength devices is challenging due a large mode mismatch. Here, we establish new scheme for realizing highly miniaturized couplers efficiently exciting on-chip controllable way. Relying on both resonant Pancharatnam–Berry mechanisms, our meta-device can couple circularly polarized surface plasmon, which then focused into spot placed with target device. We experimentally...

Dynamically controlling terahertz (THz) waves with an ultracompact device is highly desired, but previously realized tunable devices are bulky in size and/or exhibit limited light-tuning functionalities. Here, we experimentally demonstrate dynamic modulation on THz a dielectric metasurface mode-selective or mode-unselective manners through pumping the system at different optical wavelengths. Quasi-normal-mode theory reveals that physics governed by spatial overlap between wave functions of...

With the development of wearable electronic devices and flexible biosensing technology, organic electrochemical transistors have received more attention. Fabric-based (F-OECTs) a broad application prospect in due to their substrate flexibility, breathability other advantages. This paper firstly introduces structure operation mechanism transistors, secondly focuses on relationship between F-OECT materials, fabrication methods, device structures, etc. transistor performance, finally describes...

Abstract Freely switching light transmission and absorption via an achromatic reflectionless screen is highly desired for many photonic applications (e.g., energy-harvesting, cloaking, etc.), but available meta-devices often exhibit reflections out of their narrow working bands. Here, we rigorously demonstrate that optical metasurface formed by two resonator arrays coupled vertically can be perfectly at all frequencies below the first diffraction mode, when near-field (NF) far-field (FF)...

We report a facile route towards the phase-controlled synthesis of 3D α- and ε-MnO₂ hierarchical stars, which can serve as efficient catalysts for ORR-based applications.

Abstract Airy beams exhibit intriguing properties such as nonspreading, self-bending, and self-healing have attracted considerable recent interest because of their many potential applications in photonics, to beam focusing, light-sheet microscopy, biomedical imaging. However, previous approaches generate using photonic structures suffered from severe chromatic problems arising strong frequency dispersion the scatterers. Here, we design fabricate a metasurface composed silicon posts for range...

Freely tailoring the wavefronts of surface waves (SWs) plays a vital role in on-chip photonics applications, but diffraction-optics based devices usually exhibit limited tuning functionalities and low working efficiencies. Here, we propose new strategy to manipulate near-field SWs with Pancharatnam–Berry (PB) metasurfaces exhibiting predesigned phase profiles. As SW beam flows across such metasurface, scattered by different PB meta-atoms interfere each other, forming wavefront under...

Manganese dioxide is one of the important electrode materials used for oxygen reduction reaction (ORR) in fuel-cell and metal-air batteries, its electrochemical activity greatly influenced by crystalline structure. To elucidate structure effect on ORR, herein, we designed a facile method to obtain α-MnO2 γ-MnO2via adjusting acid under hydrothermal conditions using same starting reagents. The prepared γ-MnO2 have similar morphology composed 3D microscopic spheres made up numerous nanorods....

Abstract Vectorial optical fields (VOFs) exhibiting tailored wave fronts and spatially inhomogeneous polarization distributions are particularly useful in photonic applications. However, devices to generate them, made by natural materials or recently proposed metasurfaces, either bulky size less efficient, exhibit restricted performances. Here, we propose a general approach design metadevices that can efficiently two distinct VOFs under illuminations of circularly polarized lights with...

Achieving a pre-designed scattering pattern from an ultra-compact platform is highly desired for on-chip integration optics, but conventional techniques suffer the limitations of bulky size, wavelength-scale modulation and low efficiency. Here, we propose new strategy to

<sec> <b>What is already known about this topic?</b> </sec><sec> Cervical cancer the fourth most common of women around world. Age-adjusted incidence and mortality rates cervical were 11.78 3.29 per 100,000, respectively, in China 2015. added by report?</b> screening 25.7% for aged 20–64 years old 31.4% 35–64 Screening lower rural areas than urban varied across provinces. are implications public health practice?</b> Efforts should be made to continue strengthen national local policy...

Abstract Although amorphous materials are popular in oxygen electrocatalysis, their performance requires further improvement to meet the need for rechargeable zinc–air batteries. In this work, an amorphous/crystalline layered manganese oxide (ACMO) was designed, and its unique homogeneous structure activated reduction activity with a positive half‐wave potential of 0.81 V evolution moderate overpotential 407 mV at 10 mA cm −2 . Moreover, endowed ACMO excellent stability. While employed as...

It is now recognized that the development of self-supported and efficient bifunctional air cathodes via direct growth earth-abundant catalysts onto surface conductive collector would be a cutting-edge strategy to reduce interfacial resistance, enhance mechanical tenure, final weight cost manufacturing rechargeable Zn–air batteries (ZABs). This work reports an innovative precious metal-free electrode, comprising carbon sphere chains (CSCs) directly grown paper (CP) substrate, wherein CSCs...

Lavender-like α-MnO₂@α-MnO₂ and balsam pear-like α-MnO₂@γ-MnO₂ were prepared exhibited a better performance than that of in dimethyl ether combustion.

Plasmonic vortices have shown a wide range of applications in on-chip photonics due to their fascinating properties the orbital angular momenta (OAM) and phase singularity. However, conventional devices generate them suffer from issues low efficiencies limited functionalities. Here, we establish systematic scheme construct high-efficiency bifunctional metasurfaces that can two plasmonic exhibiting distinct topological charges, based on series reflective meta-atoms tailored reflection-phases...

It is today advanced that the development of a free-standing (binderless) air cathode via direct growth nonprecious metal electrocatalysts onto surface conductive collector would be cutting-edge strategy to reduce interfacial resistance, improve mechanical stability, and final weight cost manufacturing. Here, for Zn-air batteries (ZABs), we propose an innovative binderless noble-metal-free hierarchical nanostructured bifunctional in which high-density MnOx nanorods (NRs) are directly grown...

Abstract The rational design of the electrocatalysts is paramount to alleviating global energy and environment crisis. Despite a bright future MnO 2 shown in storage conversion, intrinsic low electrical conductivity glooms its application electrocatalytic reactions like oxygen reduction/evolution (ORR/OER). doping strategy applied equip self‐supported with enhanced ORR/OER zinc‐air battery performance. In this work, class free‐standing nanorods arrays on carbon paper‐doped either cobalt or...