Low-temperature solution process for preparing flexible transparent carbon nanotube film for use in flexible supercapacitors
| Autor: | Yi-Cheng Wang, Ashok K. Sundramoorthy, Sundaram Gunasekaran |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Scanning electron microscope Nanotechnology Carbon nanotube Condensed Matter Physics Atomic and Molecular Physics and Optics Flexible electronics law.invention Indium tin oxide symbols.namesake Dynamic light scattering Chemical engineering law symbols General Materials Science Electrical and Electronic Engineering Raman spectroscopy Sheet resistance Transparent conducting film |
| Zdroj: | Nano Research. 8:3430-3445 |
| ISSN: | 1998-0000 1998-0124 |
| Popis: | Single-walled carbon nanotubes (SWNTs) possess high conductivity, mechanical strength, transparency, and flexibility, and are thus suitable for use in flexible electronics, transparent electrodes, and energy-storage and energy-harvesting applications. However, to exploit these properties, SWNTs must be de-bundled in a surfactant solution to permit processing and use. We report a new method to prepare a SWNT-based transparent conducting film (TCF) using the diazo dye 3,3′-([1,1′-biphenyl]-4,4′-diyl)bis(4-amino naphthalene-1-sulfonic acid), commonly known as Congo red (CR), as a dispersant. Uniform 20-nm-thick TCFs were prepared on rigid glass and flexible polyethylene terephthalate (PET) substrates. The CR-SWNT dispersion and the CR-SWNT TCFs were characterized via UV-Vis-NIR, Raman spectroscopy, FT-IR spectroscopy, transmission electron microscopy (TEM), field-emission scanning electron microscopy (FE-SEM) and dynamic light scattering (DLS) measurements. The sheet resistivity of the CRSWNT TCF was ~34 ± 6.6 Ω/□ with a transmittance of 81% at 550 nm, comparable to that of indium tin oxide-based films. Unlike SWNT dispersions prepared in common surfactants, such as sodium dodecyl sulfate (SDS), sodium cholate (SC), and Triton X-100, the CR-SWNT dispersion was amenable to forming TCF by drop coating. The CR-SWNT TCF was also very stable, maintaining a very low sheet resistivity even after 1,000 consecutive bending cycles of 8 mm bending radius. Further, manganese dioxide (MnO2) was electrochemically deposited on the CR-SWNT-PET film (MnO2-CR-SWNT-PET). The as-prepared MnO2-CR-SWNT-PET electrode exhibited high specific capacitance and bendability, demonstrating promise as a candidate electrode material for flexible supercapacitors. |
| Databáze: | OpenAIRE |
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