1. Structural evolution induced by Au atom diffusion in Ag2S
- Author
-
Fu Zhang, Qian Wang, Tongwei Yuan, Huang Zhou, Xun Hong, Benjin Jin, Yafei Zhao, Geng Wu, and Genqiang Zhang
- Subjects
Nanostructure ,Materials science ,010405 organic chemistry ,Metals and Alloys ,General Chemistry ,010402 general chemistry ,01 natural sciences ,Catalysis ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Nanomaterials ,Chemical physics ,Transmission electron microscopy ,Phase (matter) ,Atom ,Materials Chemistry ,Ceramics and Composites ,Diffusion (business) ,Absorption (electromagnetic radiation) ,Spectroscopy - Abstract
Atom diffusion processes govern the structure and composition of core-shell nanomaterial, which play a crucial role in determining their properties. By using aberration-corrected high-resolution transmission electron microscopy and X-ray absorption near-edge structure spectroscopy in combination with in situ X-ray diffraction, we confirm that single-atom diffusion of Au to Ag2S occurs, and that the transition from the Au@Ag2S core-shell nanostructure to AuAgS-AuAgx or Ag3AuS2-AuAgx heterostructures was observed. Moreover, the phase of the ternary sulfide induced by Au single-atom diffusion in Ag2S is determined by the ratio of Au and Ag, thus exhibiting a significant difference in the photocatalytic activity performance.
- Published
- 2019