Mechanism of Optical and Electrical HS Gas Sensing of Pristine and Surface Functionalized ZnO Nanowires.

In this work, the sensing ability and the underlying reaction pathways of HS adsorption on two nanomaterial systems, pristine zinc oxide (ZnO) nanowires (NWs) and gold functionalized zinc oxide nanowires (Au@ZnO NWs), were explored in a side-by-side comparison of optical and electrical gas sensing. The properties of optical sensing were analyzed by photoluminescence intensity-over-time measurements (-) of as-grown ZnO NW samples, and the electrical gas-sensing properties were analyzed by current-over-time measurements (-) of ZnO NW chemically sensitive field-effect transistor (ChemFET) structures with a gas-sensitive open gate. The ZnO NWs were grown by high-temperature chemical vapor deposition (CVD) and thereafter surface-functionalized with a thin Au nanoparticle layer by magnetron sputtering.

Multiscale Defective Interfaces for Realizing Na-CO Batteries With Ultralong Lifespan.

Despite their favorable high energy density and potential for CO recycling, Na-CO batteries have been held back by limitations in cycling capability, stemming from the sluggish CO reduction/evolution reaction (CORR/COER) kinetics at CO cathode and unmanageable deposition/stripping of metallic Na at the anode upon cycling. Herein, a "two-in-one" electrode with multiscale defective FeCu interfaces (CP@FeCu) is presented, which is capable of improving the CORR/COER kinetics of CO-breathing cathode, while modulating sodium deposition behavior. Experimental and theoretical investigations reveal multiscale defective FeCu interfaces are responsible for the enhancement of sodiophilicity and catalytic properties.

Defect Density and Atomic Defect Recognition in the Middle Layer of a Trilayer MoS Stack.

Molybdenum disulfide (MoS) is one of the most intriguing two-dimensional materials, and moreover, its single atomic defects can significantly alter the properties. These defects can be both imaged and engineered using spherical and chromatic aberration-corrected high-resolution transmission electron microscopy (C/C-corrected HRTEM). In a few-layer stack, several atoms are vertically aligned in one atomic column.

Single-Crystal P2-NaMnNiO Cathode Material with Improved Cycling Stability for Sodium-Ion Batteries.

Layered oxides constitute one of the most promising cathode materials classes for large-scale sodium-ion batteries because of their high specific capacity, scalable synthesis, and low cost. However, their practical use is limited by their low energy density, physicochemical instability, and poor cycling stability. Aiming to mitigate these shortcomings, in this work, we synthesized polycrystalline (PC) and single-crystal (SC) P2-type NaMnNiO (NMNO) cathode materials through a solid-state route and evaluated their physicochemical and electrochemical performance.

An Efficient Electron Ptychography Method for Retrieving the Object Spectrum from Only a Few Iterations.

We present an efficient approach for electron ptychography based on a mathematical relationship that differs from that underlying the established algorithms of the ptychography iterative engine or the noniterative algorithms like the Wigner-distribution-deconvolution or the single-side-band method. Three variables are handled in this method-the transfer function of the objective lens, the object spectrum, and the diffraction wave whose phase is unknown. In the case of an aberration-corrected electron microscope, one is able to obtain a well-estimated transfer function of the lens.