1 ‘ 고 ( 高 ) ’ 분자시스템 : 기술융합 (technology fusion) 의 주역

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‘ 고 ( 高 )’ 분자시스템 : 기술융합 (Technology Fusion) 의 주역

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Delocalized electrocloud

• Preparation of Conducting Polymer – redox reaction

- Chemical Doping, Electrochemical Doping, Physical Method - Dopant - Halogen( Br2, I2 etc.), Lewis acid( AsF5, SO3, FeCl3 etc.)

protonic acid ( HCl, H2SO4, HClO4 etc.)

• • π-conjugated polymer structure

Conducting Polymer

AsF5-e-

+

electron hole

low (10-9S/cm)

high (103S/cm)(polaron)

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Conducting Polymer

• • Polyacetylene

• Poly(p-phenylene)

• Poly(phenylene sulphide)

• Poly(p-phenylene vinylene)

• Polythiophene

• Polypyrrole

• Polyaniline

n

Sn

n

Sn

CONDUCTING

POLYMER

Insulators

Metal105

100

10-5

10-10

10-15

10-20

PolyacetylenePoly(p-phenylene)

Poly(phenylene sulfide)Polypyrrole

Polythiophene

Nylon

PVCPolystyrene

Polyimide(Kapton)PTFE(Teflon)

S cm-

1

NH n

[ ]n

Semi-

conductors

Conduction Band

Valence Band

X

Nn

H

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Applications of Conducting Polymers

ConductingPolymer

Device(diodes, FETs, etc)

InterconnectingWiring

Rechargeable Batteries

Lithography(Charge dissipators, C

onducting resists)

ElectrostaticDischarge(ESD)

Collosion Protectionof Metals

Electromagnetic Interference

(EMI) Shielding

Metallization

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Electronic Paper

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Li-Polymer Battery

리튬 폴리머전지전해질로 고체나 겔 형태의

고분자 전해질을 사용- 리튬 이온 폴리머전지

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Li-Polymer Battery

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Cheap, Plastic Solar Cells

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Photorefractive Polymer

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Photoresists

(insol.) (sol.)

Lithographic processes

Deep - UV : Eximer Laser, KrF (248㎚ )

→ 0.25 ㎛ line for 256 M DRAM

X-ray (~1nm) → 0.1 ㎛ line for >1 Giga DRAM

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Polymeric Materials for Photonics

Spatial light modulator

March-Zehnder Interferometer

Optical switching

1) Compact Disc Technology (Polycarbonate) The pits : 0.25 ㎛ deep, 0.5 ㎛ wide, 3.5 ㎛ long →control bifringenc

e

2) Nonlinear Optical Materials → switches, modulators, and amplifiers

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Twisted Nematic Liquid Crystal Display

Structure of the dispersed liquid crystal droplets

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Organic Light Emitting Diodes

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Organic Light Emitting Diodes

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Applications of OLED

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Nanopore Sensor

Applied voltage draws a DNA strand and surrounding ionic solution through a biological nanopore. The various DNA units in the strand block ion flow by differing amounts. In turn, by measuring these differences in ion current, scientists can detect the sequence of DNA units. Simulation allows detailed study to enhance the abilities of these DNA sequencers. Potential applications for NASA missions include astronaut health, life detection and decoding of various genomes.

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POLYMER - CNT COMPOSITE

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Health, Medicine, and Biotechnology → The challenges are great : the rewards are greater.

1) Implants and Medical Devices ; Stable and Biocompatible

ex) Artificial kidney. Contact lens, Artificial organs

Dental material (PMMA), Catheters etc.

2) Diagnostic

Automated clinical analyzer : Surlyn etc.

3) Controllled Drug Release Trans dermal patches (ex: Seasickness patches) Microspheres , pumps, aerosols, contraceptive implants → Diffusion, Erosion or Osmotically controlled systems ex. Procardia XL, Duragesic, Estraderm Nitrosoureas in Anhydride linkage (brain cancer)

4) Biopolymers DNA, RNA, proteins, carbohydrates and lipids in Molecular recognition, Biological motion, Bioelastomers Biocomposites