Underwood Lambertsen (bonsaiperch59)

Catalytic activities of the hematite/M(M = Au, Pd) MS are investigated toward simultaneous catalytic reduction of o-nitrophenol and p-nitrophenol. The resultant hematite/Pd MS showed high structural stability and catalytic active sites than the hematite/Au MS, which enhances the catalytic properties for the simultaneous catalytic reduction of both nitrophenols.Metal-organic frameworks (MOFs) featuring high porosity and tunable structure make them become promising candidates to fabricate carbon-based microwave absorption (MA) materials to meet the requirements of electronic reliability and defense security. However, it is challenging to rationally design a well-organized micro-nanostructure to simultaneously achieve strong and wideband MA performance. Herein, a three-dimensional (3D) hierarchical nanoarchitecture (CoNi@NC/rGO-600) comprising pomegranate-like CoNi@NC nanoclusters and ultrasmall CoNi-decorated graphene has been successfully fabricated to broaden the absorption bandwidth and enhance the absorption intensity. The results confirm that the bimetallic MOF CoNi-BTC-derived pomegranate-like CoNi@NC nanoclusters with porous carbon shell as "peel" and sub-5 nm CoNi nanoparticles as "seeds" favor multiple polarization, magnetic loss, and impedance matching. Moreover, the interconnected 3D CoNi-doped graphene acts not only as a bridge to connect pomegranate-like CoNi@NC nanoclusters but also as a conductive network to supply multiple electron transportation paths. Consequently, the optimized CoNi@NC/rGO-600 exhibits extraordinary MA performance in terms of wide bandwidth (6.7 GHz) and strong absorption (-68.0 dB). As an effective strategy, this work provides a new insight into fabricating hierarchical composite structures for advancing MA performances and other applications.Gold (Au) electrodes are one of the most ideal electrodes and are extensively used to construct electrochemical biological detection platforms. The electrode-molecule interface between the Au electrode and biomolecules is critical to the stability and efficiency of the detection platform. However, traditional Au-sulfur (Au-S) interfaces experience distortion due to high levels of glutathione (GSH) and other biological thiols in biological samples as well as a high charge barrier when electrons are injected into the biomolecule from the Au electrode. In view of the higher bonding energy of Au-selenium (Au-Se) bonds than those of Au-S bonds and the elevated Fermi energy of the Au electrodes when Au-Se bonds are formed instead of Au-S bonds at the interface between the electrodes and molecules, we establish a new type of electrochemical platform based on the Au-Se interface (Au-Se electrochemical platform) for high-fidelity biological detection. Compared with that of the electrochemical platform based on the Au-S interface (Au-S electrochemical platform), the Au-Se electrochemical platform shows a higher charge transfer rate and excellent stability in millimolar levels of GSH. The Au-Se electrochemical platform supplies an ideal solution for accurate biological detection and has great potential in biomedical detection applications.Recent years have witnessed significant development of flexible strain sensors in a variety of fields. Nevertheless, the challenge of integrating a broad sensing range (>50%) with high sensitivity [gauge factor (GF) value > 100 over the entire sensing strain] in one single flexible strain sensor still exists. Herein, we prepared a flexible strain sensor based on braided graphene belts (BGBs) and dragon skin. Such a BGB strain sensor exhibits an integration of a wide sensing range (up to 55.55%) and high sensitivity (GF value > 175.16 through the entire working range). Besides, this BGB strain sensor also demonstrates a minute monitoring limit (0.01%), low hysteresis and overshoot behaviors, and reliable cycling repeatability (>6000 cycles). The SEM microscopy observations reveal that the skew angle and intersection r