Template-directed Synthesis of Ag2S-Fe2O3 Heterostructures

Tuesday, 26 May 2015: 11:20
Conference Room 4G (Hilton Chicago)
Y. Chen, S. Liu, M. Zhao, L. Yu, H. Dong (Qingdao University of Science and Technology), and L. Dong (Qingdao University of Science and Technology, Missouri State University)
Controlled synthesis of optical-magnetic nanostructures has attracted more and more interest due to their simultaneous optical properties and magnetic manipulating. Ag2S nanocrystals, with a low (~1.0 eV) band gap at room temperature, have become one of the most commonly studied semiconductor nanocrystals. Due to their excellent photoelectric and thermoelectric properties, Ag2S nanocrystals have been widely used in photocatalysis, near-infrared fluorescence imaging, and photoconductive cells. In addition, Fe2O3 nanoparticles with or without interior voids have both magnetic and photocatalytic properties. Thus, the integration of Ag2S and Fe2O3 nanoparticles may lead to further improvements of their optical performance. However, it still remains a difficult task to prepare these desired hybrids in a controllable fashion.

Herein, we demonstrated the synthesis of nanocomposites containing silver sulfide and iron oxide materials by the sulfidation of silver-iron oxide nanotemplates with elemental sulfur as sulfur resource. In the presence of oleylamine, the sulfidation of silver-iron oxide heteromers retained similar nanostructures as templates, indicating an in-situ sulfidation of silver. TEM images, UV-Vis absorption spectra and XRD patterns of as-prepared Ag-Fe2O3 and Ag2S-Fe2O3 nanoparticles synthesized by sulfidation with elemental sulfur were shown in this paper. These investigations would help us to understand the sulfidation and growth process of nanomaterials and control their synthesis for a given application.