| Title |
Tunable Structural Design and Thermal Characteristics of SiO2 Hybrid on Cu2O Pigment via Dual-Effect of NH4OH Catalyst |
| Authors |
유리(Ri Yu); 윤지연(Ji Yeon Yun); 양희승(Hee Seung Yang); 피재환(Jae Hwan Pee); 김유진(Yoo Jin Kim) |
| DOI |
https://doi.org/10.3365/KJMM.2015.53.2.110 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Cu2O; nanostructured materials; surface modification; phase transformation; transmission electron microscopy (TEM) |
| Abstract |
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 200~300 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 (150~500 ℃). 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. |