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Atomic-scale intermolecular interaction of hydrogen with a single VOPc molecule on the Au(111) surface

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Title
Atomic-scale intermolecular interaction of hydrogen with a single VOPc molecule on the Au(111) surface
Author(s)
Jinoh Jung; Shinjae Nam; Christoph Wolf; Andreas J. Heinrich; Jungseok Chae
Publication Date
2021-02-12
Journal
RSC ADVANCES, v.11, no.11, pp.6240 - 6245
Publisher
ROYAL SOC CHEMISTRY
Abstract
Molecular dynamics of hydrogen molecules (H-2) on surfaces and their interactions with other molecules have been studied with the goal of improvement of hydrogen storage devices for energy applications. Recently, the dynamic behavior of a H-2 at low temperature has been utilized in scanning tunnelling microscopy (STM) for sub-atomic resolution imaging within a single molecule. In this work, we have investigated the intermolecular interaction between H-2 and individual vanadyl phthalocyanine (VOPc) molecules on Au(111) substrates by using STM and non-contact atomic force microscopy (NC-AFM). We measured tunnelling spectra and random telegraphic noise (RTN) on VOPc molecules to reveal the origin of the dynamic behavior of the H-2. The tunnelling spectra show switching between two states with different tunnelling conductance as a function of sample bias voltage and RTN is measured near transition voltage between the two states. The spatial variation of the RTN indicates that the two-state fluctuation is dependent on the atomic-scale interaction of H-2 with the VOPc molecule. Density functional theory calculations show that a H-2 molecule can be trapped by a combination of a tip-induced electrostatic potential well and the potential formed by a VOPc underneath. We suggest the origin of the two-state noise as transition of H-2 between minima in these potentials with barrier height of 20-30 meV. In addition, the bias dependent AFM images verify that H-2 can be trapped and released at the tip-sample junction.
URI
https://pr.ibs.re.kr/handle/8788114/9234
DOI
10.1039/d0ra08951f
ISSN
2046-2069
Appears in Collections:
Center for Quantum Nanoscience(양자나노과학 연구단) > 1. Journal Papers (저널논문)
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