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Probing an Interfacial Ionic Pairing-Induced Molecular Dipole Effect in Ionovoltaic System
Sun Geun Yoon1, Byoung Joon Park2, Huding Jin1
1Program in Nano Science and Technology, Graduate School of Convergence Science and Technology, Seoul National University, Gwanak-gu, Seoul, 08826, Republic of Korea.
Small Methods
|December 20, 2021
Summary
Ionic pair formation significantly shifts interfacial potential in ionovoltaic systems. This molecular dipole effect, influenced by binding affinity and structure, offers a new method for probing interfaces.
Area of Science:
- Surface science and electrochemistry
- Materials science and nanotechnology
Background:
- Interfacial potential is crucial for electronic and electrochemical systems.
- Surficial molecular dipole effects, driven by ion-molecular interactions, influence interfacial properties.
- Understanding specific interactions between surfaces and adsorbates is key.
Purpose of the Study:
- To investigate ionic pair formation-induced interfacial potential shifts in an ionovoltaic system.
- To analyze output signal variations linked to surficial dipole changes on self-assembled monolayers.
- To explore the relationship between molecular structure, binding affinity, and interfacial potential shifts.
Main Methods:
- Utilized photoelectron spectroscopies and density functional theory (DFT) simulations.
- Observed and analyzed ionic pair formation and its effect on interfacial potential.
- Correlated ionovoltaic output changes with adsorption isotherms.
Main Results:
- Ionic pair formation induces significant interfacial potential shifts.
- Potential shifts depend strongly on the paired molecular structure and binding affinity.
- Chemical contributions, including polarizability and ionic character (chaotropic/kosmotropic), were identified.
Conclusions:
- Demonstrated an efficient interfacial molecular probing method using ionovoltaic systems.
- Established a theoretical correlation between ionovoltaic output and molecular dipole effects.
- Highlighted the role of ionic interactions in modulating interfacial properties.
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