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Comparison with other materials
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Comparison with other conductive materials
Static electricity is fatal at manufacturing sites for TV/smartphone displays and other electronic devices. Static electricity can damage the products and make dust stick to the products. Static electricity is nothing but a headache.
Static electricity is caused by instantly discharging an electric charge that has been imbalanced (charged) on some surfaces by making two distinct materials contact and separate.
To prevent static electricity, conductive materials are coated on surfaces, which prevents electricity from becoming imbalanced (charged).
Here is a table to summarize typical materials for antistatic applications.
Please scroll horizontally.
| PEDOT:PSS (polythiophene) |
CNT (Carbon nanotube) | Surfactants | Polypyrrole, polyaniline |
|
|---|---|---|---|---|
| Conductivity | Excellent | Good | Acceptable | Good |
| Transparency | Excellent | Excellent | Excellent | Acceptable |
| Durability | Acceptable → Good | Excellent | Acceptable | Poor → Acceptable |
| Contamination on contact surface | Extremely low | Extremely low | Somewhat high | Low |
| Stability in a low-humidity environment | Electronic conduction | Electronic conduction | Poor, Ionic conduction | Electronic conduction |
| Processing | Coating | Coating Compounding |
Coating Compounding |
Coating Compounding |
| Necessary quantity | Low | Low | High | High |
| Material cost | Acceptable | Acceptable | Very Inexpensive | Inexpensive |
| Main solvent | Water-based | Water-based or solvent-based | Water-based or solvent-based | Solvent based |
| Usability with different substrates | Acceptable → Excellent | Acceptable → Excellent | Acceptable → Excellent | Acceptable → Excellent |
| PEDOT:PSS (polythiophene) |
CNT (Carbon nanotube) | Surfactants | Polypyrrole, polyaniline |
“→” means that it can be improved with our formulation techniques.
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PEDOT:PSS (polythiophene)
This is a polythiophene-based conductive coating material, superior in conductivity and transparency. Its feature is that it stably functions even in a low-humidity environment.
Although the cost of PEDOT:PSS is relatively high compared to other materials, the necessary quantity is low, and a film with a thickness of 0.03 μm is Good enough to maintain its conductivity. -
CNT (Carbon nanotube)
By dispersing carbon nanotubes, the high transparency and conductivity appear.
The conductivity could be adjusted by changing the type and size of particles.
The performance can be expressed with an extremely thin layer as similar as PEDOT/PSS. -
Surfactants
These are less expensive and widely used. But, they may not work well in a cleanroom where humidity is low because their mechanism for discharging electricity relies on Ionic conduction through the absorption of water (moisture) near the surface of the material.
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Polypyrrole, polyaniline
These are a kind of conductive polymer and possess conductivity by themselves, which enables them to stably function under a low-humidity environment.
As for their disadvantages, they are easily colored to some extent and are not so durable.