Tunable Structural Design and Thermal Characteristics of SiO2 Hybrid on Cu2O Pigment via Dual-Effect of NH4OH Catalyst

摘要

This paper reports the tunable structural design and thermal characteristics of a SiO2 layer on Cu2O pigment via a dual-effect of NH4OH catalyst. We prepared octahedron Cu2O 200 similar to 300 nm in size and successfully synthesized a core-shell Cu2O@SiO2 structure using a modified Stober method in which the NH4OH concentration was adjusted. The NH4OH solution dipping time was controlled such that the Cu2O core was generated with a yolk-shell and a hollow-shell. The silica-coated Cu2O raw materials were calcined at various temperatures (150 similar to 500 degrees C). The thermal and color effects of the silica on the Cu2O were characterized by scanning electron microscopy, CIE L* a* b* color parameter measurements, transmission electron microscopy, and X-ray diffraction.