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Scanning Tunneling Microscopy Observations of Sulfur Adsorbates on Pd (111) Surface

Xinli Leng 1, Lili Song 2, Zhongping Wang 1, Xiaoqing Liu 1, and Li Wang 1
1. Department of Physics, Nanchang University, Nanchang, P.R. China
2. Department of Chemistry, Nanchang University, Nanchang, P.R. China
Abstract—The adsorption behaviors of sulfur atoms on Pd (111) surface have been investigated by Scanning Tunneling Microscopy (STM). After the clean Pd (111) surface is exposed to different doses of H2S at room temperature. The direct STM results of one monolayer adsorption show the terraces of Pd surface are dominated by \ Pd (111)-S while a mixture of small area of  \, disordered S and \ stripes distributes along the step edges. Excess one monolayer adsorption results in minor change for the proportion of different structures. The evolution of S induced reconstruction with the annealing temperature are also investigated by STM. After annealing to 370K, most of  \ reconstruction on the terrace are converted into \. Heating to 420K and 470K favors the missing of more and more sulfur atoms at the area of  \ while no obvious change occurs in the \ area. The corresponding models are given for three observed ordered reconstruction structures. 

Index Terms—scanning tunneling microscopy, sulfur, palladium, heating, reconstruction

Cite: Xinli Leng, Lili Song, Zhongping Wang, Xiaoqing Liu, and Li Wang, "Scanning Tunneling Microscopy Observations of Sulfur Adsorbates on Pd (111) Surface," International Journal of Electronics and Electrical Engineering, Vol. 4, No. 3, pp. 239-242, June 2016. doi: 10.18178/ijeee.4.3.239-242
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