 We offer products of OEX-C200 and CNF-C500 for the applications of transparent conductive film, conductive filler and reinforcement filler.
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The product OEX-C200 features network structured CNT used for transparent conductive film. |
The product CNF-C5000 features a low-tangled carbon nanofiber used for conductive filler (EMI, ESD) and reinforcement fillers (CFRP) |
The discovery of carbon nanotube may date back to a patent regarding the carbon filament of incandescent lamp granted in 1889. However, only when in 1991, an NEC's scientist Dr. Iijima reported on Nature of his TEM observation, the mystery of a multi-walled carbon nanotube structure was unveiled. Since then, flourishing research activities have been carried out in many major research institutes in the world. Some postulate of its novel applications such as NASA's space elevator from the Earth to the moon have been discussed publicly. Numerous potential applications have been reported in the fields such as FPC, IC packaging, opto-electronics, energy storage, composited, among others.
Figure1. Custom made products can be produced with our proprietary processing capability.
The focuses of MCL technology expertises for the applications are in three major categories, which are:
¡´ opto-electronics
¡´ reinforcement
¡´ EMI/ESD film/coatings
In Material and Chemical Research Lab (MCL) of ITRI, a research team has been working on this subject over 8 years, and accumulated valuable experiences of key technologies covering manufacturing of carbon nanotube, morphology tailoring, dispersion, coating/patterning processes, and among others. With MCL's unique CNT's properties, we are able to develop the applications with the forms of film, fiber, conductive liquid, and devices. As illustrated in Figure 1, among our innovative product technologies, two success cases including the licensing and technology transfer for CNT/CNF continuous manufacturing process, modification/dispersion, and CNT conductive film are underway.
With MCL platform technologies, two unique CNT products were developed with successful industrial applications, one is network structured OEX-C200 and the other one is low tangled CNF-C5000. The flexible manufacturing routes developed in MCL enable the morphology controlled CNTs for different applications. In addition to variety of morphologies, we can produce regular products with uniform size range, e.g. 40-100nm low-tangled CNF-C5000 and 1-3nm networked OEX-C200 with high conductivity.
Figure 2. MCL's proprietary processes for modification and dispersion provide custom made master batch
for different applications.
The low-tangled CNF-C5000 is easily dispersed and modified by different functional groups to match the compatibility essential to our clients' special matrixes. MCL's CNF-C5000 can be used in reinforced composite and EMI film, etc., which features a low-tangled morphology, easy dispersion, tunable tube diameter, easy surface modification, higher connectivity when dispersed for EMI shielding products. Figure 2 illustrates our unique capability of modifing and dispersing CNTs in different matrixes for client's special requirement.
The network-structured CNT combined with our unique proprietary technologies of structure design can achieve high transparent and high conductivity demands. The MCL's CNT/PET features an excellent flexurability, as shown in Figure 3, roll-to-roll process readiness and overall lower processing cost. With competitive lower cost and comparable properties, CNT/PET conductive film is a potential candidate to replace ITO/PET film in some opto-electronic applications. The comparison of OEX-C200 with world leading commercial products as shown in Figure 4, indicated that our products have excellent properties, particularly with a lower sheet resistance.
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Figure 3. After bending 180¢X, MCL¡¦s CNT film
retain
a low sheet resistance, e.g. < 1000£[/¡¼ |
The comparison of ITRI OE-CNT with
other commercial products |
Company |
A |
B |
C |
D |
ITRI |
Process |
Arc
Discharge |
High Pressure
CVD |
CVD |
CVD |
Proprietary |
Diameter |
1.3-1.5nm |
0.8-1.2nm |
1.5-1.7nm |
0.8-1.2nm |
2-2.5nm |
G/D |
~40 |
13 |
2.81 |
15 |
35 |
Carbon Purity(TGA) |
60-70wt% |
85wt% |
>70wt% |
>85wt% |
>90wt% |
Appearance(SEM) |
High purity1 |
High purity1 |
High purity1 |
Lowpurity2 |
High purity1 |
1:embedded metal catalyst impurity
2:many spherical carbons |
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Figure 4. The table shows the comparison of MCL's CNT with leading companies. A significantly high conductivity compared with commercial products, as shown in the right-hand plot, is the advantage of MCL's OEX-C200 in addition to controlled morphology and sizes. |
The following table summarizes the common properties of two regular CNT products. We also can offer the derivatives based on these CNT fiber/powder materials for some noverl applications.
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OEX-C200 |
CNF-C5000 |
Purity (wt%) |
>80% |
>90% |
Diameter (nm) |
1.5-2.5nm |
40-60 nm |
Surface area* |
In determination |
70-100m2/g |
Length range* |
 |
 |
Wall number* |
1-3 |
NA |
G/D Ratio |
>20 |
NA |
Product type |
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cake, powder, solution |
Powder, cake,
waterdispersion (0.2wt%) |
Powder, CNF Cotton |
Master solution |
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Continuous phase:
Epoxy, Polyamide, PC, PP, etc. |
NA |
Epoxy |
Solid content (wt%) |
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5% |
* for reference only, not guaranteed.
Key Technologies, Facility and Services
Carbon Nano-Tube, CNT, low-tangled, networked structure, EMI shielding, reinforcement, high conductivity film, CNT master batch
Contact information
MCL Technology Showcase
Chun-Sien Lin, PhD, Senior Researcher
Materials and Chemical Research Labs, ITRI
Tel: 886-3-5913597 Fax:886-3-5835087
Email: mcl_tech@itri.org.tw
Address : Rm. 205-2, Bldg. 77, 195, Sec. 4, Chung Hsing Rd.,
Chutung, Hsinchu, Taiwan 31015
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