Obtaining p-type wide-bandgap semiconductors with a bandgap >3.5 eV is still challenging. Here, p–n junction devices based on (≥4 eV) MnO quantum dots (QDs) and n-type Si-doped GaN are fabricated. The p-MnO QDs synthesized by cost-effective femtosecond laser ablation in liquid. A simple spray-coating method used for fabricating the p-MnO/n-GaN-based solar-blind deep UV (DUV) photodetector. X...

In advance of the arrival of the DAWN spacecraft at 4Vesta in 2011, it is useful to reassess our knowledge of the constitution and probable evolution of this ancient differentiated asteroid. It has been recognized for some time that the eucrite, diogenite and howardite meteorites likely represent samples from 4Vesta or from related Vestoids based upon the good match of reflectance spectra of th...

In this study triggered-lightning induced fulgurites were formed in 99.9% pure binary oxides of manganese (MnO) and nickel (NiO) in order to study oxide reduction mechanisms. The fulgurite formation process involved packing the oxide in PVC holders and using the standard rocket-and-wire technique to trigger a lightning strike through the oxide at the International Center for Lightning Research ...

Structure activity relationship, density functional theory, catalytic oxidation and mechanism have become the frontier in MnO 2 environmental catalysis.

Abstract The wastewater containing phenol is harmful, and the process complicated, photocatalytic oxidation technology believed to be greenest promising strategy for contaminants removal because of solar energy utilization no additional oxidants. Herein, manganese dioxide(MnO 2 ) doped with metal was fabricated by a low-temperature hydrothermal method, specific surface area MnO photocatalyst si...

The dramatic increase of smart mobile devices and applications, the advent of Android OS, the increased number of wireless radios (incl. NFC) the support and the low awareness about security and privacy risks on the one hand, and the flatter, IP-based network architecture, the introduction of new radio technologies (femtocells, WiFi, LTE) and applications (M2M, NFC) on the other, have changed t...

Nickel foam (NF) with a three-dimensional porous structure plays an important role in wide variety of applications such as energy storage and conversion, catalysis, sensor due to its high porosity, low density, excellent conductivity. However, the main drawback NF is that ligaments are very smooth, thus surface area relatively low. In this work, we propose novel strategy, oxidization reduction ...

Electrical and magnetic properties of four series of manganates Ln x Ca 1-x MnO 3 (Ln=La, Nd, Gd and Y) have been studied in the electron doped regime (x=0.02-0.25) in order to investigate the various interdependent phenomena such as ferromagnetism, phase separation and charge ordering. The general behavior of all the four series of manganates is found to be similar, with some of the properties...

To understand the thermodynamic characteristics of reaction between Al and SiO2 during continuous casting process high-aluminum steel, activity coefficients MnO in molten slags (18–43%) CaO-(33–64%) SiO2-(9–21%) Al2O3-(2–3%) MgO-(<2.4%) were measured at 1400°C, 1450°C 1500°C by experiments Si Mn equilibrium liquid copper slag graphite crucible under mixed gas atmosphere CO Ar. The effects SiO2,...

Ultrafine MnO(2) nanowires with sub-10 nm diameters have been synthesized by a simple process of hydrothermal treatment with subsequent calcinations to form networks that exhibit an enhanced specific capacitance (279 F g(-1) at 1 A g(-1)), high rate capability (54.5% retention at 20 A g(-1)) and good cycling stability (1.7% loss after 1000 cycles).