Transparent Conductive Inks
Maxell developed transparent conductive inks with bases of conductive polymer and metal oxide.
They can be applied to wet-coating and enable you to control surface resistance for a wide range. They can also be used for transparent electrode, EMI shield and anti-static applications.
Features of Transparent Conductive Inks
- Maxell’s ink can form a highly transparent conductive coat by dispersing nanosized particles uniformly.
- Control of surface resistance in a wide range (102～1010Ω/sq) is possible with high transparency.
- The refractive index of conductive coating is very close to that of substrate and adhesive.
- Flexible coating structure enables flexible applications effectively.
- We can adjust the high dispersion ink to meet with various wet-coating conditions.
Properties
| Item | Conductive polymer (PEDOT) | Metal oxide (ITO)※2 | Metal oxide (ATO)※3 | |
|---|---|---|---|---|
| Ink properties | Viscosity(mPa･s) | 2～40 | 2～20 | 0.5～20 |
| pH | 2～3 | － | 5～9 | |
| Solvent | Water/Alcohol | Ketone | Water/Alcohol | |
| Coating properties | Surface resistance (Ω/sq) |
102～103 (proper value) |
104～106 (proper value) |
108～1010 (proper value) |
| Total light transmittance(％)※1 | > 90 | > 85 | > 95 | |
| Haze(％)※1 | < 1.0 | < 2.0 | < 0.5 | |
| Refractive index | 1.4 | 1.6 | 1.5 | |
| Pencil hardness | H～3H | H～2H | 4H | |
| Substrate | Film(PET)、Glass | |||
| Ink particle structure (TEM) |
|
|
|
|
| Cross-section of coating (SEM) |
|
|
|
|
※1 Total light transmittance and haze data are only the conductive coating.
※2 Under review the ink composition.
※3 Under development solvent-free and UV-curable type.
Adoption results “light blue hatching”
Conductive polymer “PEDOT”
- Transparent conductive material of dispersed nanosized polymer particle
- Adjustable ink composition to various wet coating conditions
- Controllable surface resistance subject to coating thickness
- Refractive index of conductive coating being very close to that of substrate and adhesive
- Flexible coating structure enables flexible applications effectively
Ink properties
Coating properties
Reliability
Metal oxide “ATO”
- Transparent conductive material of dispersed nanosized ATO particle
- Adjustable ink composition to various wet coating conditions
- High transparency, resistance stability and high reliability “high temperature resistance, humidity resistance and weather resistance“
- Refractive index of conductive coating being very close to that of substrate and adhesive
Ink properties
Coating properties
