Enhanced photoluminescence of hollow CaWO₄ microspheres: the fast fabrication, structural manipulation, and exploration of the growth mechanism

Abstract

Calcium tungstate (CaWO4) has been extensively studied for optical applications due to the high luminous efficiency and photoluminescence (PL) emissions generated from its scheelite-type tetragonal architecture. Nevertheless, how to fabricate...

ZnFe2O4/Graphitic Carbon Nitride Nano/Microcomposites for the Enhanced Electrochemical Sensing of H2O2

“…Compared with single metal oxides, nanosized spinel bimetal oxides were reported to show excellent electrocatalytic properties, which have already been utilized as advanced electrode architectures, photoelectric structures, and surface catalysts. ,− Among these compounds, ZnFe 2 O 4 (ZFO) reveals apparent merits in biosensors, attributed to the good catalytic activity, easy separation, low cost, and eco-friendliness. − For example, ZFO nanoparticles have been developed for the electrochemical determination of 5-fluorouracile, epinephrine, and glucose in recent years. − Nevertheless, the practical applications of pristine ZFO are often hampered, attributed to the poor inherent electronic conductivity and severe structural collapse induced by huge volumetric change and particle aggregation during the electrochemical reactions. Building a hierarchical hybrid nanostructure between nanosized ZFO and the conductive matrix is a prospective strategy to overcome the above-mentioned defects for the usage of pure ZFO materials. − Although the modified ZFO electrodes with carbonaceous matrixes (such as mesoporous carbon, amorphous carbon spheres, carbon nanotubes, and graphene) have been proved to exhibit remarkable electrochemical performances, − the simple and economical fabrication of hybrid composites with uniform micro/nanostructures and a respectable particle size for the detection of H 2 O 2 still remains a huge challenge.…”