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Optoelectronic properties and interfacial durability of CNT and ITO on boro-silicate glass and PET substrates with nano- and heterostructural aspects
Author(s): Joung-Man Park; Zuo-Jia Wang; Dong-Jun Kwon; Lawrence DeVries
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Paper Abstract

Nano- and hetero-structures of carbon nanotube (CNT) and indium tin oxide (ITO) can control significantly piezoelectric and optoelectronic properties in Microelectromechanical Systems (MEMS) as sensing and actuator under cyclic loading. Optimized preparing conditions were obtained for multi-functional purpose of the specimen by obtaining the best dispersion and turbidity in the solution. Optical transmittance and electrical properties were investigated for CNT and ITO dipping and spraying coating on boro-silicate glass and polyethylene terephthalate (PET) substrates by electrical resistance measurement under cyclic loading and wettability test. Uniform dip-coating was performed using Wilhelmy plate method due to its simple and convenience. Spraying coating was applied to the specimen additionally. The change in the electrical resistance and optical properties of coated layer were mainly dependent upon the number of dip-coating, the concentration of CNT and ITO solutions, and the surface treatment condition. Electric properties of coating layers were measured using four-point probe method, and surface resistance was calculated using a dual configuration method. Optical transmittance of CNT and ITO coated PET film was also evaluated using UV spectrum. Surface energy and their hydrophilic and hydrophobic properties of CNT and ITO coated substrates were investigated by wettability test via static and dynamic contact angle measurements. As the elapsing time of cyclic loading passed, the stability of surface resistance and thus comparative interfacial adhesion between coated layer and substrates was evaluated to compare the thermodynamic work of adhesion, Wa. As dip-coating number increased, surface resistance of coated CNT decreased, whereas the transmittance decreased step-by-step due to the thicker CNT and ITO networked layer. Nano- and heterostructural effects of CNT and ITO solution on the optical and electrical effects have been studied continuously.

Paper Details

Date Published: 18 February 2011
PDF: 8 pages
Proc. SPIE 7928, Reliability, Packaging, Testing, and Characterization of MEMS/MOEMS and Nanodevices X, 79280Q (18 February 2011); doi: 10.1117/12.871033
Show Author Affiliations
Joung-Man Park, Gyeongsang National Univ. (Korea, Republic of)
The Univ. of Utah (United States)
Zuo-Jia Wang, Gyeongsang National Univ. (Korea, Republic of)
Dong-Jun Kwon, Gyeongsang National Univ. (Korea, Republic of)
Lawrence DeVries, The Univ. of Utah (United States)

Published in SPIE Proceedings Vol. 7928:
Reliability, Packaging, Testing, and Characterization of MEMS/MOEMS and Nanodevices X
Sonia Garcia-Blanco; Rajeshuni Ramesham, Editor(s)

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