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