期刊
NANOTECHNOLOGY
卷 20, 期 3, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/20/3/035701
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资金
- American Chemical Society
- National Science Foundation [CBET-0731349, CBET-0642217]
The work functions of various DySi2-x nanostructures epitaxially grown on a Si(001) surface were correlated with the structure using high-resolution Kelvin probe force microscopy and scanning tunneling microscopy in ultrahigh vacuum. Dy adatoms induce a surface dipole on Si(001) that increases the surface potential from 0.26 to 0.42 eV with respect to 2 x 1 reconstructed Si(001). DySi2-x nanowires showed a 0.2-0.23 eV lower work function than DySi2-x nanoislands, which can be attributed to confinement of electrons along the surface normal that induces a surface dipole when the film thickness approaches the Fermi wavelength. The ability to tune the work function of metal nanostructures should be useful for understanding how electronic structure affects catalytic activity.
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