| 초록 |
SWNT/polydimethylsiloxane (PDMS) composites that can be used as stretchable conductors are prepared by spraying a mixed solution of ionic liquid based SWNT gel and PDMS onto an elastic substrate. Subsequently, the composites are exposed to nitric acid vapor. Finely dispersed and well connected SWNT pathways are formed in the polymer matrix due to the addition of ionic liquid. Doping of the SWNTs by nitric acid can significantly lower the sheet resistance (Rs) of the composites; samples with 4 wt% of SWNT content exhibit the lowest Rs, 50 Ω/sq, which corresponds to a conductivity value of 63 S/cm. Stretching the composite sample to 300% of the original length increased the Rs value to 320 Ω/sq (19 S/cm). Even after several stretch/release cycles, the conductivity remains constant at a value of 18 S/cm. These results provide a scalable route for preparing highly stretchable and conductive SWNT composites with relatively low SWNT concentrations. |
