Functional Nanocomposites Laboratory

CNTCNT 및및 CNT CNT 볼을볼을 이용한이용한 투명투명 전도막전도막

�� 개요개요: : MultiMulti--walled Carbon Nanotubewalled Carbon Nanotube (MWCNT)(MWCNT)를를 투명한투명한 고분자에고분자에 분분산시켜서산시켜서 투명투명 전도코팅막을전도코팅막을 제조하는제조하는 기술기술. MWCNT. MWCNT를를 0.5~3.0 0.5~3.0 wt% wt% 투명투명 고분자에고분자에 혼합한혼합한 후후 완벽하게완벽하게 분산시키면분산시키면 1010--22 S/cmS/cm 전전기기 전도도를전도도를 갖는갖는 코팅을코팅을 얻을얻을 수수 있다있다. . 물론물론 전도도를전도도를 더더 낮추면낮추면 전전자파자파 차폐기능차폐기능 및및 정전기방지정전기방지 기능을기능을 갖는갖는 코팅이코팅이 가능하다가능하다. . 또한또한MWCNTMWCNT를를 100 nm~10100 nm~10㎛㎛의의 크기르크기르 갖는갖는 고분자고분자 볼의볼의 표면에표면에 고정고정시켜서시켜서 MWCNTMWCNT를를 분산시키는분산시키는 대신대신 고분자고분자 볼을볼을 분산시켜서분산시켜서 CNTCNT의의양을양을 감소시키고감소시키고 분산의분산의 여려움을여려움을 극복할극복할 수수 있는있는 기술기술

�� 응용분야응용분야: : Display, Solar Cell, Packaging, Display, Solar Cell, Packaging, 전자파전자파 차폐코팅차폐코팅, , ESD(Electrostatic Discharge)ESD(Electrostatic Discharge)코팅코팅

�� 참고문헌참고문헌: : •• Organic Electronics, 9(1), 1Organic Electronics, 9(1), 1--13 (2008).13 (2008).•• Macromol. Rapid Comm., in press (2008).Macromol. Rapid Comm., in press (2008).

Functional Nanocomposites Laboratory

Transparent Flexible Electrodes:Multiwalled Carbon Nanotube (MWCNT)/PMMA Composites (a) Before sonication

(b) After sonication

(c) 24 hrs after sonication

1 2 3 4 5

1 2 3 4 5

1 2 3 4 5

Visual observation of MWCNT polymer mixtures (a) before sonication, (b) after sonication, and (c) aged for 24 hours after sonication. The samples indicated are 1: MWCNT/PMMA/chloroform, 2: MWCNT/PMMA/toluene, 3: MWCNT/PMMA/THF, 4: MWCNT/PMMA/DMF and 5: MWCNT/PVDC/DMF.

400 600

88

90

92

94

96

98

100

102

Transmittance(%

)

Wavenumber(cm-1)

1. PMMA/toluene

2. PMMA/chloroform

3. PVDC/DMF

5. PMMA/DMF

4. PMMA/THF

Functional Nanocomposites Laboratory

Transparent Flexible Electrodes:Multiwalled Carbon Nanotube (MWCNT)/PMMA Composites

(a) PMMA/chloroform (b) PMMA/toluene (c) PMMA/THF

(d) PMMA/DMF (e) PVDC/DMF

1 mm 1 mm 1 mm

1 mm 1 mm

(a) MWCNT/PMMA/chloroform

(b) MWCNT/PMMA/toluene

(c) MWCNT/PMMA/THF

(d) MWCNT/PMMA/DMF

(e) MWCNT/PVDC/DMF.

1.5 wt%3.0 wt%

0 2 4

65

70

75

80

85

90

95 Transmittance(%) at 480nm

Conductivity(S/cm)

MWNTs loading(wt%)

Transmittance(%)

1E-5

1E-4

1E-3

0.01 Conductivity(S/cm)

Functional Nanocomposites Laboratory

Transparent Flexible Electrodes:Multiwalled Carbon Nanotube (MWCNT)/PMMA Composites

Effect of Surface Peel-off

Schematic of MWCNT exposure on the surface caused by mechanical polishing to eliminate the polymer-rich region on the cast film (a) before and (b) after polishing.

Electrical conductivity of MWCNT/PMMA composites as a function of repeated mechanical polishing (a), and surface micrographs of composites film comparing (b) before polishing, (c) after 1st polishing, and (d) after 2nd polishing.

Functional Nanocomposites Laboratory

Scheme of the simple processing technique for producing the MWCNTs adsorbed PS beads.

Scheme of the simple processing technique for producing the MWCNTs adsorbed PS beads.

� Condition

All of PAH solution

PSS solution

(Negatively charged PSS electrostatically interacts with the positively PAH)

→ Negatively charged CNT interacts with positively charged PAH layer

(A) Pristine PS (B) after Layer-by-Layer

(C), (D) Deposition MWNTs on PS beads

(A) Pristine PS (B) after Layer-by-Layer

(C), (D) Deposition MWNTs on PS beads

Images of (I) pristine PS, (II) modified PS after layer-by-layer method, (III) MWCNTs dispersed in water and (IV) blended dispersions of PS

beads and MWNTs

Images of (I) pristine PS, (II) modified PS after layer-by-layer method, (III) MWCNTs dispersed in water and (IV) blended dispersions of PS

beads and MWNTs

MWCNT Multi-layered Shell Bead