Atomic and nanostructures of monolayer c(2 x 2)NiN on Cu(001)

作者：Hashimoto Yoichiro; Nakatsuji Kan^*; Iimori Takushi; Komori Fumio

来源：Surface Science, 2010, 604(3-4): 451-457.

DOI：10.1016/j.susc.2009.12.019

• Surface reconstruction
• Stress relaxation
• Nanostructures
• Nitrogen adsorption

Structures of monolayer nickel nitride (NiN) on Cu(0 0 1) surface are studied by X-ray photoelectron spectroscopy (XPS), low energy electron diffraction (LEED) and scanning tunneling microscopy (STM). Formations of Ni-N chemical bonds and NiN monolayer at the surface are confirmed by XPS on the N-adsorbed Cu(0 0 1) surfaces after Ni deposition and subsequent annealing to 670 K. A c(2 x 2) structure is always observed in the LEED patterns, which is a quite contrast to the (2 x 2)p4g structure observed usually at the N-adsorbed Ni(0 0 1) surface. Atomic images by STM indicate the mixture of Ni-N and Cu-N structures at the surface. Density of the trenches on the N-saturated surface decreases and the grid pattern on partially N-covered surfaces becomes disordered with increasing the Ni coverage. These results are attributed to the decrease of the surface compressive stress at the N-adsorbed Cu surface by mixing Ni atoms.

• 出版日期2010-2-15