Transcript CNT Wires

Super-aligned carbon nanotube film and its
application in touch panels
Shoushan Fan
Department of Physics
Tsinghua-Foxconn Nanotechnology Research Center
Tsinghua University
Beijing, China
Tsinghua-Foxconn Nanotechnology Research Center
Tsinghua University, Beijing, China
GOAL
To make carbon nanotubes useful!
Reality and Dreams of Carbon Nanotubes
The Reality
The Dreams
C-H
CVD
Ar
Laser
Laser ablation
Arc discharge
To Make Carbon
Nanotubes in Order
Field emission
Nanoelectronics
Sensors
Photonics
SPM probes
Composites
…
Breakthrough in Making Orderly CNTs
Radom
Aligned
Science
283 (1999) 512
Super-Aligned
CNT Films
Nature
419 (2002) 801
CNT Films and Unique Properties
8-inch wafer
1cm
Transparent,
Anisotropic
Conductivity,
Flexible,
Polarized
Free of catalyst
8” wafer
300m long film
Carbon Nanotube Film Touch Panel
CmHn
Advantages
•
•
•
•
Replacing indium with carbon
Truly flexible and durable,
Suitable for 3-D molding
No photolithography, due to
anisotropic conductivity
High transparency, due to
polarization of the CNT film
Advanced Functional Materials, 20 (2010) 885; 21 (2011) 2721
Features of CNT Touch Panels
 Bending Test
Fixing Frame
Radius of flexture: 5mm
CNT Film
Sliding Path: 120mm
Truly Flexible
Features of CNT Touch Panels
CNT touch panels are durable
Pen Pitting Durability Test
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•
Weight: 500g
Pen size: 0.8mm (diameter)
Frequency: 3 knocks/sec.
Total: > 2 KK knocks (Pass)
Knocked side: Film-side
Scrape Durability Test
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•
•
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Weight: 500g
Pen size: 0.8mm (diameter)
Total: > 2 KK knocks (Pass)
Scrape side: Film-side
Pen Pitting Test
Scrape Test
GLASS+FILM
PMMA+FILM
CNT-Sensor
CNT-Sensor
PMMA
PMMA
Function Test : PASS
Features of CNT Touch Panels
Optimized transparency for polarized light
CNT Film
LCD
Nature light
e
Polarization
of light
CNT Film
e
Polarization
of light
CNT Film
100.00
95.00
Perpendicular
90.00
Parallel
Polarization of light
85.00
Polarization of light
80.00
75.00
70.00
65.00
60.00
Parallel
45 degree
Perpendicular
1.5
2.5
Features of CNT Touch Panels
CNT
ITO
Low reflectivity
(3% less)
Water proof
Anti-inteference
Touch force sensing
Processing Comparison: CNT & ITO
ITO
CNT
Raw materials
Forming films
Patterning
Indium & Tin
Mining
Smelting
Target
preparation
Vacuum
Evaporation
Sputtering
Lithograph
Etching
Expensive
facilities
Pollution
CmHn
NO
Patterning
CVD
6000C 30min
Dry pulling
For making 100 million TP, CNT processing saves
9 million kwh of electricity and 1 million tons of water
8”- CNT Wafer: Mass Production
CNT Touch Panel: Mass Production
2,000 m2 cleanroom
2 million 4-7” CNT touch panels per month
CNT Touch Panel: Commercialization
2002
2005
2008
2012
Will.i.am
25 million CNT touch panels have been sold
SACNT Wafer: Potential Applications
8-inch wafer
4-inch wafer
12-inch Quartz wafer
Super aligned carbon nanotubes
Carbon nanotubes with clean wall surface
No catalyst in CNT arrays
Easy to be patterned and transferred
Markets ?
CNT Wires: Ultrathin and Strong
CNT wires
Cu coated CNT wires
Ultra-thin diameter, High tensile strength, High flexibility
Low weight, bio-compatible
CNT Papers: Mass Production
Parallel laying
Cross laying
Conducting
Flexible
Anti-corrosion
High permeability
Bio-compatible
CNT films for Lithium Ion Batteries
Conductive network
Structural scaffold
Lightweight and flexible
CNT film current collectors
• Flexible and high strength
• Better rate performance and excellent cycling
• Lightweight and higher energy density
Adv. Mater. 2012, 24, 2294 ; Adv. Funct. Mater., 2013, 23, 846 ; Nano Lett., 2013, 13, 818
CNT-film/Polymer Composite Actuators
Polymer
CNT-film
Anisotropic conductivity
Carbon Nanotube Film Heating Devices
Polarized light
Micro-heater array
Flexible heater
Uniform heating Flexibility
Fast temperature response
Addressable micro-heater arrays
Looking for Real Applications
Advanced Materials, 21( 2009) 3563
Thermo-Acoustic Effect: CNT Film Speaker
Transparent, Flexible, Stretchable Speaker
Nano Letters，8 (2008) 4539
CNT thermoacoustic
Prototype
Samples of CNT chips
Speaker
Nano Lett. 13 (2013) 4795
Acknowledgment
• National Basic Research Program of China
• National Science Foundation of China
• Foxconn Technology Group
Thank You
谢 谢