An Ultramicroporous Graphene-Based 3D Structure Derived from Cellulose-Based Biomass for High-Performance CO Capture.

The use of powered activated carbon is often limited by inconsistent particle sizes and porosities, leading to reduced adsorption efficiencies. In this study, we demonstrated a practical and environmentally friendly method for creating a 3D graphene nanostructure with highly uniform ultramicropores from wood-based biomass through a series of delignification, carbonization, and activation processes. In addition, we evaluated the capture characteristics of this structure for CO, CH, and N gases as well as its selectivity for binary-mixture gases.

High-Performance Electrochromic Devices Based on Size-Controlled 2D WO Nanosheets Prepared Using the Intercalation Method.

It is difficult to obtain ultrathin two-dimensional (2D) tungsten trioxide (WO) nanosheets through direct exfoliation from bulk WO in solution due to the strong bonding between interlayers. Herein, WO nanosheets with controllable sizes were synthesized via K intercalation and the exfoliation of WO powder using sonication and temperature. Because of the intercalation and expansion in the interlayer distance, the intercalated WO could be successfully exfoliated to produce a large quantity of individual 2D WO nanosheets in -methyl-2-pyrrolidone under sonication.

pH-Dependent Photophysical Properties of Metallic Phase MoSe Quantum Dots.

Fluorescence properties of quantum dots (QDs) are critically affected by their redox states, which is important for practical applications. In this study, we investigated the optical properties of MoSe-metallic phase quantum-dots (MoSe-QDs) depending on the pH variation, in which the MoSe-QDs were dispersed in water with two sizes (Φ~3 nm and 12 nm). The larger MoSe-QDs exhibited a large red-shift and broadening of photoluminescence (PL) peak with a constant UV absorption spectra as varying the pH, while the smaller ones showed a small red-shift and peak broadening, but discrete absorption bands in the acidic solution.