TY - JOUR
T1 - Self-assembly of two-dimensional nanoclusters observed with STM
T2 - From surface molecules to surface superstructure
AU - Liu, Canhua
AU - Matsuda, Iwao
AU - D'Angelo, Marie
AU - Hasegawa, Shuji
AU - Okabayashi, Jun
AU - Toyoda, Satoshi
AU - Oshima, Masaharu
PY - 2006
Y1 - 2006
N2 - A type of stable and identical two dimensional (2D) Au nanoclusters are discovered to exist on the Si(111)-3×3-Ag surface at submonolayer Au coverage. Self-assembly of these Au nanoclusters leads to a 2D superstructure Si(111)-21×21-(Ag+Au). This discovery helps us to obtain definite evidence that all the previously proposed atomic structure models for the 21×21 structure can be excluded. A model in which three Au adatoms locate on Ag triangles in the 21×21 unit cell is built based on the low-temperature scanning tunneling microscopy observations. Additionally, the stability and the uniformity of the Au nanocluster are discussed in terms of a substrate-mediated interaction among the Au adatoms, and the self-assembling process is understood by analogizing the Au nanocluster with a kind of surface molecule.
AB - A type of stable and identical two dimensional (2D) Au nanoclusters are discovered to exist on the Si(111)-3×3-Ag surface at submonolayer Au coverage. Self-assembly of these Au nanoclusters leads to a 2D superstructure Si(111)-21×21-(Ag+Au). This discovery helps us to obtain definite evidence that all the previously proposed atomic structure models for the 21×21 structure can be excluded. A model in which three Au adatoms locate on Ag triangles in the 21×21 unit cell is built based on the low-temperature scanning tunneling microscopy observations. Additionally, the stability and the uniformity of the Au nanocluster are discussed in terms of a substrate-mediated interaction among the Au adatoms, and the self-assembling process is understood by analogizing the Au nanocluster with a kind of surface molecule.
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U2 - 10.1103/PhysRevB.74.235420
DO - 10.1103/PhysRevB.74.235420
M3 - Article
AN - SCOPUS:33845472295
VL - 74
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 23
M1 - 235420
ER -