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ELECTRICAL AND ELECTROMECHANICAL CHARACTERISTICS OF NANOASSEMBLED CARBON NANOTUBE THIN FILM RESISTORS ON FLEXIBLE SUBSTRATES Wei Xue and Tianhong Cui Department of Mechanical Engineering, University of Minnesota, Minneapolis, USA Transducers’07. Speaker: Wen-Fan Liao ID:g946220. Outline. - PowerPoint PPT Presentation
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ELECTRICAL AND ELECTROMECHANICAL CHARACTERISTICS OF NANOASSEMBLED
CARBON NANOTUBE THIN FILM RESISTORS ON FLEXIBLE SUBSTRATES
Wei Xue and Tianhong CuiDepartment of Mechanical Engineering, University of Minnesota, Minneapolis, USA
Transducers’07
Speaker: Wen-Fan Liao
ID:g946220
Outline
Introduction Experiments Device Characteristics Conclusion References
Introduction
This paper report the fabrication of single-walled carbon nanotube (SWNT) thin-film on plastic substrates with layer-by-layer self-assembly
assemble SWNTs on flexible substrates and explore the properties of the SWNT thin films which are built with alternating layers of SWNTs and PDDA
Experiments
Layer-by-layer self-assembly of polyelectrolytes/CNTs andpolyelectrolytes/nanoparticles
Ref : T Cui and W Xue, “Assembling three-dimensional carbon nanotube-based cantilever arrays,” SPIE Newsroom 2007
naonoparticles
Polyelectrolytes(+)
CNTs(-)
Experiments
(a) Structure of self-assembled SWNT multilayer thin film (b) SEM image of assembled SWNTs
(PDDA/SWNT)n(PDDA/PSS)2
1μmRef : W Xue and T Cui, “Deposition and characterization of layer-by-layer nano selfassembled carbon nanotube multilayer thin films” IEEE NEMS 2007
Experiments
Schematic structure of a SWNT thin-film resistor built on a flexible substrate
Cr/Au
Ref : W Xue and T Cui, “Deposition and characterization of layer-by-layer nano selfassembled carbon nanotube multilayer thin films” IEEE NEMS 2007
Experiments
(a) Flexed transparency film with prepatterned electrodes (b) Transparency coated with 5 layers of SWNTs
Experiments 4156A Precision S
emiconductor Parameter Analyzer
up to four probes Measurements inc
lude I-V curve, Id-Vg graphs, etc
Ref : http://www.ee.byu.edu/cleanroom/HP4156A.phtml
Device Characteristics
Characteristics of SWNT thin-film resistors on flexible substrates
R10 =6.37 MΩR0 =1.35 MΩRn =(R0×R10)/[R0+(n-10) ×R10]
6.37MΩ
0.37MΩ 0.30MΩ 0.21MΩ 0.14MΩ
Device Characteristics
Resistance versus mechanical deformation of SWNT thin-film resistors
G14 = △R14/R14 = 38.2%G16 = R△ 16/R16 = 47.1%
Device Characteristics
Schematic models for axial deformation of SWNT on different topographies
Conclusion
demonstrated the fabrication and characterization of SWNT multilayer thin films on flexible substrates
MEMS/NEMS devices such as pressure sensors, accelerometers, and magnetic sensors have the potential to be developed and fabricated
References Wei Xue and Tianhong Cui, “Electrical and electromechanical characte
ristics of nano-assembled carbon nanotube thin film resistors on flexible substrates,” Transducers’07, Lyon, France, June 2007
Wei Xue and Tianhong Cui, “Deposition and characterization of layer-by-layer nano selfassembled carbon nanotube multilayer thin films,” IEEE NEMS 2007, Bangkok, Thailand, pp. 371-376, January 2007
Tianhong Cui and Wei Xue, “Assembling three-dimensional carbon nanotube-based cantilever arrays,” The International Society for Optical Engineering - SPIE Newsroom - Micro/Nano Lithography & Fabrication, http://spie.org/x17490.xml, DOI: 10.1117/2.1200710.0901, 2007
http://www.ee.byu.edu/cleanroom/HP4156A.phtml
~Thank you for your attention~