Acid-treated SWCNT/polyurethane nanoweb as a stretchable and transparent conductor
- Acid-treated SWCNT/polyurethane nanoweb as a stretchable and transparent conductor
- 김태안; 이상수; 김희숙; 박민
- Stretchable electronics; Transparent conductor; electrode
- Issue Date
- RSC advances [electronic resource].
- VOL 2, NO 28, 10717-10724
- To obtain carbon-nanotube (CNT) conductors with high conductance and transmittance, wellconnected
conducting paths must be formed with a relatively small number of CNTs. In this study,
we employed electrospun polyurethane (PU) nanofibers to guide the deposition of CNTs at desired
locations, which makes it possible to acquire high conductivity at low concentrations of CNTs. PU
has an affinity for CNTs and inherently elastic characteristics; thus, it can be applied as a stretchable
scaffold for CNT deposition. A sample fabricated by nine dipping-and-washing cycles in acid-treated
single-walled CNT (a-SWCNT) solution and distilled water, followed by doping, exhibited a sheet
resistance of 424 Ω sq-1 at 63%T. When we measured the resistance of a-SWCNT/PU conductors
under a wide range of strains (up to 100%), their change in resistance was reduced as more stretching/
releasing cycles were applied. In addition, these variations in resistance according to the number of
stretching cycles could be significantly reduced when dipping and doping processes were performed
using a pre-stretched PU nanoweb. After more than six stretching cycles, the resistance under a tensile
strain of up to 100% remained nearly stable at a value of 8.15 kV. Our results demonstrate an effective
way of preparing a transparent and stretchable conductor with stable performance during repetitive
stretching and releasing.
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