Nano-Size Surface Materials Stabilized by Weak Interaction |
| Journal |
Materials Science Forum (Volume 614) |
| Volume |
Advanced Materials Science and Technology |
| Edited by |
Jian Lu |
| Pages |
21-26 |
| DOI |
10.4028/www.scientific.net/MSF.614.21 |
| Online since |
March, 2009 |
| Authors |
Kenichi Tanaka,
Xiao Hong Jiang
|
| Keywords |
(-Ag-O-) Chain, (-Cu-O-) Chain, Adsorption of C2H5OH, Ag(110), Bad Gap, Honeycomb Layer of Zn3, Nano-Dot of Metal, Quantum Effect, Quasi-Compound, Si(111)-7x7, Surface Migration |
| Abstract |
Scanning tunneling microscopy (STM) proved the existence of quasi-compounds on solid surfaces. A typical example is (-Ag-O-) or (-Cu-O-) chains grown on Ag(110) or Cu(110) surface by exposing to O2. The (-Ag-O-) chains on a Ag(110) reacts with Cu atoms to form a new quasi-compound of (-Cu-O-) chains on the Ag(110) surface. The (-Cu-O-) on the Ag(110) readily decomposes at ca. 570ºK to form Cu6 dots, and a reversible reaction of (Cu2)3 + O2. ↔ (-Cu-O-) takes place by exposing to O2. Deposited Zn, Sn and Ag atoms on a Si(111)-7x7 surface stabilize by forming Zn3, Sn2 and Sn, and Ag in a half unit cell. Layer-by-layer growth of Zn3 clusters occurs in a half unit cell, which results in the growth of a semi-conductive honeycomb layer of Zn3 clusters on the Si(111)-7x7 surface. By prohibiting hopping migration of Ag atoms on the Si(111)-7x7 surface by the adsorption of C2H5OH, nano-size Ag dots grow layer-by-layer in a limited mold spacing. The band gap of Ag-dots becomes narrower and narrower and becomes metallic at higher than 6 layers. |
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