Journal
NANO LETTERS
Volume 17, Issue 1, Pages 421-428Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b04393
Keywords
Vanadium dioxide; doping; carbon nanotube; phase transition; actuator
Categories
Funding
- National Basic Research Program of China [2012CB932301]
- Thousand Youth Talent Program of China
- National Natural Science Foundation of China [51602173, 51472142, 51102147, 51202012]
- China Chinese Postdoctoral Science Foundation [2014M550701, 2015T80070]
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Flexible actuators responsive to multiple stimuli are much desired in wearable electronics. However, general designs containing organic materials are usually subject to slow response and limited lifetime, or high triggering threshold. In this study, we develop flexible, all-inorganic actuators based on bimorph structures composed of vanadium dioxide (VO2) and carbon nanotube (CNT) thin films. The drastic, reversible phase transition of VO2 drives the actuators to deliver giant amplitude, fast response up to 400 Hz, and long lifetime more than 1 000 000 actuation cycles. The excellent electrical conductivity and light absorption, of CNT thin films enable the actuators to be highly responsive to multiple stimuli including light, electric, and heat. The power consumption of the actuators can be much reduced by doping VO2 to lower its phase transition temperature. These flexible bimorph actuators find applications in biomimetic inspect wings, millimeter-scale fingers, and physiological-temperature driven switches.
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