| Autor: |
Kim WS; Department of Electronic Materials Engineering, Kwangwoon University, Seoul 01897, Korea., Oh KH; Department of Electronic Materials Engineering, Kwangwoon University, Seoul 01897, Korea., Kim TH; Department of Electronic Materials Engineering, Kwangwoon University, Seoul 01897, Korea., Shin SH; Department of Electronic Materials Engineering, Kwangwoon University, Seoul 01897, Korea., Um TW; Department of Electronic Materials Engineering, Kwangwoon University, Seoul 01897, Korea., Koh JH; School of Electrical and Electronics Engineering, Jung-Ang University, Seoul 06974, Korea., Kamiko M; Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan., Ha JG; Department of Electronic Materials Engineering, Kwangwoon University, Seoul 01897, Korea. |
| Abstrakt: |
We analyze and compare the differences in the dewetting phenomena and crystal structure between Ag(5.0 nm) and Au(5.0 nm) layers deposited on a Ti(1.0 nm) seed layer coated onto a MgO(001) substrate. The samples are deposited at room temperature and annealed at 350-450 °C for 5 h. The surfaces of both Ag/Ti and Au/Ti films exhibit a completely separated island structure, subsequently leading to the formation of a nanodot array after annealing. Based on atomic force microscopy (AFM) analysis, we conclude that the dewetting progression speed of Ag/Ti films is higher than that of Au/Ti films. Based on X-ray diffraction (XRD) results, the Ti thin film acts as a seed layer, assisting the epitaxial growth of fcc-Ag(001) nanodots on the MgO(001) substrate, whereas in the case of Au/Ti, the Au layer grows non-epitaxially on the MgO(001) substrate, which is related to the difference in the surface energies of Ag and Au. Furthermore, the optical absorbance spectra of the self-organized Ag and Au nanodots with the Ti seed layer are obtained in the visible light range and the optical properties of Ag and Au nanodots are compared. |
