Rapid continuous aqueous production of copper indium sulfide quantum dots a microwave-assisted microfluidic technique.

Ternary copper indium sulfide (CIS) quantum dots (QDs) have been emerging as attractive alternatives to Cd- and Pb-based QDs in various applications owing to their favorable optical properties and low toxicity. However, methods allowing continuous production of CIS QDs in an easy-to-perform and/or organic-solvent-free way are yet to be realized. Here, we report a facile, rapid, continuous, and aqueous synthetic approach for CIS QDs based on a microwave-assisted microfluidic (MAM) technique with easy scale-up of production.

Conformal Microfluidic-Blow-Spun 3D Photothermal Catalytic Spherical Evaporator for Omnidirectional Enhanced Solar Steam Generation and CO Reduction.

Solar-driven water evaporation and valuable fuel generation is an environmentally friendly and sustainable way for clean water and energy production. However, a few bottlenecks for practical applications are high-cost, low productivity, and severe sunlight angle dependence. Herein, solar evaporation with enhanced photocatalytic capacity that is light direction insensitive and of efficiency breakthrough by virtue of a three-dimensional (3D) photothermal catalytic spherical isotopic evaporator is demonstrated.

Direct Evidences of Shallow Donor Level Enhanced Green Emission in ZnO Quantum Dots.

ZnO Quantum dots with particle sizes about 5 nm were prepared by sol-gel method, the research about the photo luminescence(PL)/photoluminescence excitation(PLE) spectrum and the fluorescence lifetime indicated that the green emissions can be divided into two parts which were attributed to different transit mechanisms. The higher energy green emission was due to the electrons transit from conduction band to oxygen vacancies while the lower energy green emission was assigned to the electrons transit from the shallow donor levels which enhanced the green emission to the oxygen vacancies and the shallow donor levels was also the reason why the green emission reach strongest intensity when the excitation energy was a little lower than the band gap energy. While the blue emission can be explained by the electrons transiting from Zinc intervals to the valence band.