Journal
NANO LETTERS
Volume 16, Issue 9, Pages 5386-5393Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b01564
Keywords
Electro-optical; electrochromic; carbon nanotubes; graphene; ionic liquid
Categories
Funding
- National Science Foundation [ECCS-1404671]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1404671] Funding Source: National Science Foundation
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Optical properties of electrochromic materials can be controlled by the application of an electric field allowing recent development of new applications such as smart windows technology for indoor climate control and energy conservation. We report the fabrication of a single-walled nanotube (SWNT) thin film based electro-optical: modulator controlled by ionic liquid polarization in which the active electrochromic layer is made of a film of semiconducting (SC-) SWNTs and the counter-electrode is composed of a film of metallic (MT-) SWNTs. Optimization of this electro-optical cell allows the operations with an optical modulation depth of 3.7 dB and a response time in the millisecond range, which is thousands of times faster than typical electrolyte-controlled devices. In addition, a dual electro-optical device was built utilizing electro-optically active SC-SWNT films for each electrode that allowed increasing modulation depth of 6.7 dB while preserving the speed of the response.
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