Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Effects of the Superlattices on STM Imaging of Self-organized Substituted Alkyl Chain Monolayers on a Graphite Surface

  • Son, Seung Bae (Department of Chemistry and Research Institute of Physics and Chemistry, Chonbuk National University) ;
  • Hahn, Jae Ryang (Department of Chemistry and Research Institute of Physics and Chemistry, Chonbuk National University)
  • Received : 2012.06.27
  • Accepted : 2012.09.28
  • Published : 2012.12.20
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Abstract

We characterized the physisorption of p-iodo-phenyl octadecyl ether molecules (I-POE) onto superlattice regions of graphite surfaces using scanning tunneling microscopy (STM). The formation of self-organized I-POE monolayers does not affect the overall structures of moir$\acute{e}$ patterns and their modulation periods. However, the packing density of the I-POE monolayer and the orientations of lamella structures were sensitive to the underlying superlattice structure. Depending on the bias voltage, the STM images selectively showed moir$\acute{e}$ pattern, I-POE layer, or both. Reflecting the local density of states at a certain energy level, the STM images thereby revealed the relative energy level scale of the superlattice with respect to the molecular orbitals of I-POE.

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References

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