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Metallic molybdenum disulfide nanosheet-based electrochemical actuators
Muharrem Acerce1, E Koray Akdoğan1, Manish Chhowalla1
1Materials Science and Engineering, Rutgers University, 607 Taylor Road, Piscataway, New Jersey, USA.
Nature
|August 31, 2017
Summary
Researchers developed new electrochemical actuators using molybdenum disulfide (MoS2) nanosheets. These advanced actuators generate significant mechanical force, offering potential for robotics and electromechanical systems.
Area of Science:
- Materials Science
- Nanotechnology
- Robotics
Background:
- Electromechanical systems and robotics rely on actuators converting electrical to mechanical energy.
- Existing actuators utilize stimuli like heat, solvent changes, or electrochemical actions.
- Applications include steerable catheters, adaptive aircraft wings, and drag-reducing wind turbines.
Purpose of the Study:
- To demonstrate molybdenum disulfide (MoS2) nanosheet films as effective electrochemical actuators.
- To characterize the mechanical forces, stresses, and strains generated by these MoS2 actuators.
- To investigate the underlying mechanisms responsible for the actuation performance.
Main Methods:
- Chemically exfoliating molybdenum disulfide (MoS2) into 2D nanosheets.
- Restacking MoS2 nanosheets on thin plastic substrates to form electrode films.
- Testing the dynamic expansion and contraction of MoS2 films under electrochemical conditions.
Main Results:
- MoS2 films generated substantial mechanical forces, lifting over 150 times their own mass.
- Actuators produced stresses of approximately 17 megapascals and strains of 0.6% at frequencies up to 1 Hz.
- Performance was linked to the high conductivity of metallic 1T phase MoS2, elastic modulus, and proton diffusion.
Conclusions:
- Restacked MoS2 nanosheet films function as powerful electrochemical actuators.
- These actuators exhibit high strain and frequency capabilities, surpassing mammalian muscle.
- The findings suggest potential for novel high-performance actuators in various applications.
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