Ordered Au/Pb nanoring arrays on Pb-induced Si(111)-1×1 surface

Lin Tang; Ze-Lei Guan; Dan Hao; Xu-Cun Ma; Jin-Feng Jia; Qi-Kun Xue
February 2009
Applied Physics Letters;2/9/2009, Vol. 94 Issue 6, pN.PAG
Academic Journal
Growth and morphology of Au on a homogenous Si(111)-1×1-Pb surface are investigated using scanning tunneling microscopy. The deposited Au atoms grow on the Si(111)-1×1-Pb surface in two-dimensional mode and a long-range ordered 8×8 reconstruction with ringlike structure is observed following room temperature deposition. Upon thermal annealing to 500 K, the 8×8 structure transforms into a hexagonal-ring array with a 4×4 superstructure. The mechanism for the formation of the two self-organized nanostructures is discussed in terms of interface diffusion, alloying, and energy minimization.


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