Electric property of ionic liquid films

1Current Research – Electric field effect of magnetism in Pd and Pt

NaCl

What are ionic liquids?

Normally ionic crystals are solid at room temperature

801℃

They turn liquid at high temperature

Current Research – Electric field effect of magnetism in Pd and Pt

2

The larger the ions, the lower the melting point

Room temperature molten salt (RTMS, = ionic liquid)

TMPA TFSI Melting point 22℃

What are ionic liquids?

TMPA (cation) TFSI (anion)

Current Research – Electric field effect of magnetism in Pd and Pt

3

What are ionic liquid films (ILF)?

TMPA (cation) TFSI (anion)

Ionic liquid film

T. Ueki and M. Watanabe, Macromolecules 41, 3739 (2008).

polymerization

4Current Research – Electric field effect of magnetism in Pd and Pt

Electrostatic properties of ILF

D. Hayakawa et al., AIP Advances 6, 115305 (2016).

𝜀0𝑆𝐶 =

2𝑑EDL

𝜅EDL+𝑡MgO

𝜅MgO

From simple circuit analysis,

: surface area: EDL thickness: relative permittivity of EDL: MgO thickness: relative permittivity of MgO

Ions can move around freely to create Electric Double Layer (EDL)

→Large electron modulation!

5Current Research – Electric field effect of magnetism in Pd and Pt

Electrostatic properties of ILF𝜀0𝑆𝐶

𝐶 =2𝑑EDL

𝜅EDL+𝑡MgO

𝜅MgO

From impedance analysis,

D. Hayakawa et al., AIP Advances 6, 115305 (2016).

Inclement: Intercept:

If we assume , which is often the case with other ionic liquids, the thickness of EDL is around 1nm

Techniques and skills• IT

Microsoft Office Suite, Origin• Programming

LabVIEW• Techniques

Circuit analysis, impedance analysis, etc.• Equipment

SMU (source measurement unit), turbo pump, etc.

6Current Research – Electric field effect of magnetism in Pd and Pt