Carbon Nanotube Photo-Thermo-Mechanical Actuator
Abstract:Carbon nanotubes show a remarkable tendency for direct (rapid) temperature increase of the order of hundreds of degrees when exposed to near infra-red light. The reason is local confinement of the heat wave in their 1D structure which generates rapid temperature rise. Here we demonstrate that these high temperatures can be exploited to generate large deformation and force output by anchoring the nanotubes to a substrate. We report energy density (i.e., work done per unit mass) of the nanotube actuator as ∼4268 J/Kg which is significantly larger than piezoceramic (∼4.25 J/Kg), magnetostrictive (∼21.6 J/Kg), lead–zinc-niobate/lead–titanate single-crystals (∼131 J/Kg), polyvinylidene fluoride trifluoro–ethylene copolymers (∼160 J/Kg) and shape memory alloys (∼1337 J/Kg).
Document Type: Research Article
Publication date: February 1, 2011
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