MoS-Coated MOF-Derived Hollow Heterostructures for Electromagnetic Wave Absorption.

Structural design constitutes one of the crucial approaches for augmenting the wave-absorbing capacity of electromagnetic wave (EMW) absorbers, and the incorporation of cavity structures represents a typical methodology therein. In this work, the MoS-coated metal-organic framework (MOF)-derived Hollow-MoS@CNS@CoS composite materials (HCNSs) were prepared by combining tannic acid-protected etching, carbonization, and hydrothermal methods. Especially, HCNS700, which possessed both a hollow structure and a layered heterogeneous structure, demonstrated excellent EMW absorption properties.

Insight into the Origin of Second Harmonic Generation and Rational Design in the Metal Halide Borates.

Metal halide borates are promising candidates for high-performance nonlinear optical (NLO) applications, yet the origins of their second harmonic generation (SHG) properties remain unclear. Using atom response theory combined with density functional theory calculations, this study investigates why halogen substitution leads to distinctly different SHG responses in halide monoborates (PbBOX) versus halide pentaborates (PbBOX). We find that the SHG origins vary between these two families due to differences in the strength of the Pb-X interactions.

High Absorption of Electromagnetic Waves Based on 3D PMMA@Mxene@CoO Composite Microsphere.

With the increasing demand for effective electromagnetic wave (EMW) absorbers due to the proliferation of electronic devices and 5G communication systems, traditional wave-absorbing materials can no longer meet the current requirements. Thus, this research introduces a three-dimensional (3D) composite material consisting of PMMA@Mxene@Co₃O₄ microspheres, prepared through in situ self-assembly and hydrothermal growth. The strong electrical conductivity of Mxene, combined with the magnetic loss of Co₃O₄, ensures enhanced dielectric-magnetic synergy, leading to excellent EMW absorption.

Facile Synthesis of Ag-Doped Urchin-like MnO on Carbon Cloth for Supercapacitors.

Based on MnO/carbon cloth (CC) composite materials, an Ag-doped MnO nanowire, self-assembled, urchin-like structure was synthesized in situ on the surface of CC using a simple method, and a novel and efficient flexible electrode material for supercapacitors was developed. The morphology, structure, elemental distribution, and pore distribution of the material were analyzed using SEM, TEM, XRD, XPS, and BET. The electrochemical performance was tested using cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD).

A Simplified Method for the Preparation of Highly Conductive and Flexible Silk Nanofibrils/MXene Membrane.

Silk nanofibers (SNF) have great applications in high-performance functional nanocomposites due to their excellent mechanical properties, biocompatibility, and degradability. However, the preparation of SNF by traditional methods often requires the use of some environmentally harmful or toxic reagents, limiting its application in green chemistry. In this paper, we successfully prepared SNF using natural silk as raw material and solvent stripping technology by adjusting the solvent concentration and solution ratio (the diameter of about 120 nm).