the discovery of plastic conductors hideki shirakawa ( 白川英樹 ) alan macdiarma alan heeger
TRANSCRIPT
The discovery of plastic conductors
Hideki Shirakawa ( 白川英樹 )
Alan MacDiarma Alan Heeger
Advantages of plastic conductor
light-weight, flexible, cheap,
soluble --> printable
Conjugated polymer
• sp2 bonding
聚乙炔 (poly-acetylene, 1958)
• π- electrons delocalized along the chain
• Dimerization opens an energy gap 2-3 eV (Peierls instability)
Other uses of "Synthetic Metals"
• Semiconductor devices Polymer LED (PPV) Plastic field-effect transistor
• All-plastic battery (PPy)
• Anti-static film, carpet... • chemical vapor sensor… etc
PPV,聚對苯乙烯
Friend, Cambridge Univ.
Alan Heeger, UNIAX
Advantages
• Light-weight, flexible (rollable), cheap
• Flat-panel light
• Versatile side-groups for different colors
Spin-coating, thickness=100 nm
10/12 明日報
Live demo of “solid-state” LED street-light
Philips
11,28
中國時報
2400 transistors
Various conjugated polymers
EM shielding
“smart” window
LED
FET
anode
“Stealth” coating
cathode
Poehler and Searson, Johns Hopkins Univ.
n
p
The All-Plastic Battery 1. Generate up to 3 Volts 2. Rechargeable for hundreds of cycles Advantages
Light in weightThin and flexibleWorking temp -20 ~ 45 CEnvironment-friendly Incorporation with solar cell
DrawbackNeed frequent recharge Linz Univ. Austria
A recent breakthrough
What’s next?
(Physics Today, this Sep)