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Experimental. Al 2 O 3 - Bandgap opening of bilayer graphene High breakdown voltage but operating voltage is limited by leakage current (~5V). 1L. 2L. 3L. Experimental. Al 2 O 3 - Bandgap opening of bilayer graphene Preheating temperature 200 ˚ C → 160 ˚C:

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slide1

Experimental

Al2O3 - Bandgapopening of bilayer graphene

High breakdown voltage but operating voltage is limited by leakage current (~5V)

1L

2L

3L

slide2

Experimental

Al2O3 - Bandgapopening of bilayer graphene

Preheating temperature 200 ˚C → 160 ˚C:

Improving coating quality, increases breakdown voltage at thinner films

slide3

Experimental

Al2O3 - Bandgapopening of bilayer graphene

Reduce PEG quantity 40 mg/ml → 20 mg/ml

Finally reduces leakage current density

(Further reducing to 10 mg/ml reduces film capacitance from 1.2 nF to 400pF)

slide4

Experimental

HfO2 – additional data

XRD – HfO2 maintains amorphous phase up to 400 ˚C

It is known that HfO2 crystallizes at 450 ~ 500 ˚C

slide5

Experimental

BaTiO3-PVDF nanocomposite

Surface treatment by phosphonic acid (x) → by H2O2

BaTiO3 NP + H2O2

Reflux at 106 ˚C, 12 hrs

Centrifuge,

Baking at 80 ˚C, 6 hrs

Dispersion in DMF

PVDF addition

High loading nanocomposite (~30%) with simple method

Some glass components are require for reflux

slide6

Experimental

Future works

Reflux device setup

HfO2 – XPS

ZTO – currently have I-V, XPS, TG-DTA

MS-related experiment (Alkyl halide inspection)

4. ITO – NMR using 2-ME isotope