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원자제어 저차원 전자계 연구단
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Unusual Diffusion Behavior of Copper-Hexadecafluoro-Phthalocyanine Molecules on Au(111)

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Title
Unusual Diffusion Behavior of Copper-Hexadecafluoro-Phthalocyanine Molecules on Au(111)
Author(s)
Songbin Cui; Tae-Hwan Kim; Ungdon Ham
Subject
Scanning tunneling microscopy, F16CuPc, Molecular diffusivity
Publication Date
2020-08
Journal
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.77, no.3, pp.258 - 263
Publisher
KOREAN PHYSICAL SOC
Abstract
© 2020, The Korean Physical Society. The unusual bias-voltage dependence of copper-hexadecafluoro-phthalocyanine (F16CuPc) molecules on Au(111) was investigated by using scanning tunneling microscopy/spectroscopy (STM/STS) at low temperatures. Depending on the bias polarity, the molecules seem to cover the whole surface of Au(111) at positive bias voltages while they are apparently invisible in STM images at negative bias voltages. Here, we experimentally demonstrate that the molecular diffusivity on Au(111) varies according to the applied electric field induced between the STM tip and the Au(111) surface rather than the intrinsic molecule-substrate interaction. Such results are corroborated by STS measurements indicating that attraction/repulsion of a molecule indeed occurs under an STM tip at positive/negative bias voltages during sweeps of the bias voltage. In addition, we found that the diffusive molecules are immobilized at a temperature of 8 K at both positive and negative bias voltages due to a lack of thermal energy for diffusion
URI
https://pr.ibs.re.kr/handle/8788114/7703
DOI
10.3938/jkps.77.258
ISSN
0374-4884
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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