Miniature spectrometer based on graded bandgap perovskite filter.

Miniature spectrometer is powerful tool for scientific research and industrial inspection. Here, we report the fabrication of graded perovskite filters with tunable bandgap and their application in constructing miniature spectrometer. The graded perovskite filters were fabricated using a Finkelstein reaction between formed halogen ion with a preformed MAPbX film.

Evaluation of FeO-MnO@RGO magnetic nanocomposite as an effective persulfate activator and metal adsorbent in aqueous solution.

A reduced graphene oxide (RGO) supported FeO-MnO nanocomposite (FeO-MnO@RGO) was successfully prepared for catalytic degradation of oxytetracycline (20 mg/L) by potassium persulfate (PS) and adsorption removal of mixture of Pb, Cu, and Cd ions (each 0.2 mM) in the synchronous scenario. The removal efficiencies of oxytetracycline, Pb, Cu, and Cd ions were observed as high as 100%, 99.

The tunable bandgap effect of SnS films.

Two-dimensional (2D) SnS has attracted much attention as a phosphorene analogue due to the promising applications in next-generation nanoelectronic and photovoltaic devices. It has a bandgap of 1.3 eV, which is matched very well with incident solar radiation.