Three-Dimensional Porous Nickel Frameworks Anchored with Cross-Linked Ni(OH)₂ Nanosheets as a Highly Sensitive Nonenzymatic Glucose Sensor

A facile and scalable in situ microelectrolysis nanofabrication technique is developed for preparing cross-linked Ni­(OH)₂ nanosheets on a novel three-dimensional porous nickel template (Ni­(OH)₂@3DPN). For the constructed template, the porogen of NaCl particles not only induces a self-limiting surficial hot corrosion to claim the “start engine stop” mechanism but also serves as the primary battery electrolyte to greatly accelerate the growth of Ni­(OH)₂. As far as we know, the microelectrolysis nanofabrication is superior to the other reported Ni­(OH)₂ synthesis methods due to the mild condition (60 °C, 6 h, NaCl solution, ambient environment) and without any post-treatment. The integrated Ni­(OH)₂@3DPN electrode with a highly suitable microstructure and a porous architecture implies a potential application in electrochemistry. As a proof-of-concept demonstration, the electrode was employed for nonenzymatic glucose sensing, which exhibits an outstanding sensitivity of 2761.6 μA mM^–1 cm^–2 ranging from 0.46 to 2100 μM, a fast response, and a low detection limit. The microelectrolysis nanofabrication is a one-step, binder-free, entirely green, and therefore it has a distinct advantage to improve clean production and reduce energy consumption

Simple Approach to Improving the Amplified Spontaneous Emission Properties of Perovskite Films

Organo-lead halide perovskite has emerged as a promising optical gain media. However, continuous efforts are needed to improve the amplified spontaneous emission (ASE) even lasing properties to evade the poor photostability and thermal instability of the perovskites. Herein, we report that simply through the coating of polymer layer, the CH₃NH₃PbBr₃ polycrystalline films prepared by a modified sequential deposition process show remarkably enhanced photoluminescence and prolonged decay lifetime. As a result, under nanosecond pulse pumping, the ASE threshold of the perovskite films is significantly reduced from 303 to 140 μJ/cm². Furthermore, the light exposure stability is improved greatly after the polymer coating. We confirmed that the polymer layer plays the roles of both surface passivation and symmetric waveguides. Our results may shed light upon the stable and sustained output of laser from perovskite materials