A lateral AlGaN/GaN Schottky barrier diode with 0.36-V turn-on voltage and 10-kV breakdown voltage by using double-barrier anode structure

GaN power electronic devices,such as the lateral AlGaN/GaN Schottky barrier diode(SBD),have received significant attention in recent years.Many studies have focused on optimizing the breakdown voltage(BV)of the device,with a particular emphasis on achieving ultra-high-voltage(UHV,>10 kV)applications.However,another important question arises:can the device maintain a BV of 10 kV while having a low turn-on voltage(V_(on))?In this study,the fabrication of UHV AlGaN/GaN SBDs was demonstrated on sapphire with a BV exceeding 10 kV.Moreover,by utilizing a doublebarrier anode(DBA)structure consisting of platinum(Pt)and tantalum(Ta),a remarkably low Von of 0.36 V was achieved.This achievement highlights the great potential of these devices for UHV applications.

Particle Size-Controlled Oxygen Reduction and Evolution Reaction Nanocatalysts Regulate Ru(bpy)_(3)^(2+)’s Dual-potential Electrochemiluminescence for Sandwich Immunoassay

Multiple signal strategies remarkably improve the accuracy and efficiency of electrochemiluminescence(ECL)immunoassays,but the lack of potential-resolved luminophore pairs and chemical cross talk hinders their development.In this study,we synthesized a series of gold nanoparticles(AuNPs)/reduced graphene oxide(Au/rGO)composites as adjustable oxygen reduction reaction and oxygen evolution reaction catalysts to promote and modulate tris(2,2′-bipyridine)ruthenium(II)(Ru(bpy)_(3)^(2+))’s multisignal luminescence.With the increase in the diameter of AuNPs(3 to 30 nm),their ability to promote Ru(bpy)_(3)^(2+)’s anodic ECL was first impaired and then strengthened,and cathodic ECL was first enhanced and then weakened.Au/rGOs with medium-small and medium-large AuNP diameters remarkably increased Ru(bpy)_(3)^(2+)’s cathodic and anodic luminescence,respectively.Notably,the stimulation effects of Au/rGOs were superior to those of most existing Ru(bpy)_(3)^(2+)co-reactants.Moreover,we proposed a novel ratiometric immunosensor construction strategy using Ru(bpy)_(3)^(2+)’s luminescence promoter rather than luminophores as tags of antibodies to achieve signal resolution.This method avoids signal cross talk between luminophores and their respective co-reactants,which achieved a good linear range of 10−7 to 10−1 ng/ml and a limit of detection of 0.33 fg/ml for detecting carcinoembryonic antigen.This study addresses the previous scarcity of the macromolecular co-reactants of Ru(bpy)_(3)^(2+),broadening its application in biomaterial detection.Furthermore,the systematic clarification of the detailed mechanisms for converting the potential-resolved luminescence of Ru(bpy)_(3)^(2+)could facilitate an in-depth understanding of the ECL process and should inspire new designs of Ru(bpy)_(3)^(2+)luminescence enhancers or applications of Au/rGOs to other luminophores.This work removes some impediments to the development of multisignal ECL biodetection systems and provides vitality into their widespread applications.

Gas-solids separation model of a novel FCC riser terminator device: super short quick separator (SSQS)

The gas flow field and the separation efficiency of a novel fluid catalytic cracking (FCC) riser terminal device, named as Super Short Quick Separator (SSQS), were studied. On the basis of above investigations, a section-lateral-mixing separation model was proposed, which included both the effect of inertia and structure of gas outlet on particles capture. After final modification, the results predicted with this model could be in good agreement with the cold experimental data. According to this model, the separation efficiency of SSQS is mainly influenced by the difference between the arc radius and the center pipe radius as well as the magnitude of particle tangential velocity.