Journal
SCIENCE CHINA-MATERIALS
Volume 61, Issue 10, Pages 1291-1296Publisher
SCIENCE PRESS
DOI: 10.1007/s40843-018-9249-y
Keywords
actuator; humidity responsiveness; interface optimization; graphene oxide; detector
Categories
Funding
- National Basic Research Program of China [2015CB932302]
- National Natural Science Foundation of China [U1432133, 11621063, 21701164]
- National Program for Support of Top-notch Young Professionals
- Fundamental Research Funds for the Central Universities [WK2060190084, WK2060190058]
- Major/Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology
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Actuators that can directly convert other forms of environmental energy into mechanical work offer great application prospects in intriguing energy applications and smart devices. But to-date, low cohesion strength of the interface and humidity responsive actuators primarily limit their applications. Herein, by experimentally optimizing interface of bimorph structure, we build graphene oxide/ethyl cellulose bidirectional bending actuators - a case of bimorphs with fast and reversible shape changes in response to environmental humidity gradients. Meanwhile, we employ the actuator as the engine to drive piezoelectric detector. In this case, graphene oxide and ethyl cellulose are combined with chemical bonds, successfully building a bimorph with binary synergy strengthening and toughening. The excellent hygroscopicity of graphene oxide accompanied with huge volume expansion triggers giant moisture responsiveness greater than 90 degrees. Moreover, the open circuit voltage of piezoelectric detector holds a peak value around 0.1 V and exhibits excellent reversibility. We anticipate that humidity-responsive actuator and detector hold promise for the application and expansion of smart devices in varieties of multifunctional nanosystems.
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