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Atomic-scale intermolecular interaction of hydrogen with a single VOPc molecule on the Au(111) surface
- Title
- Atomic-scale intermolecular interaction of hydrogen with a single VOPc molecule on the Au(111) surface
- Authors
- Jung, Jinoh; Nam, Shinjae; Wolf, Christoph; Heinrich, Andreas J.; Chae, Jungseok
- Ewha Authors
- Andreas Heinrich; 채중석; Christoph Wolf
- SCOPUS Author ID
- Andreas Heinrich; 채중석; Christoph Wolf
- Issue Date
- 2021
- Journal Title
- RSC ADVANCES
- ISSN
- 2046-2069
- Citation
- RSC ADVANCES vol. 11, no. 11, pp. 6240 - 6245
- Publisher
- ROYAL SOC CHEMISTRY
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- 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.
- DOI
- 10.1039/d0ra08951f
- Appears in Collections:
- 자연과학대학 > 물리학전공 > Journal papers
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