Stimuli‐Responsive MXene‐Based Actuators

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Abstract
MXenes, a member of 2D inorganic compounds that contain few‐atom‐thick layers of transition metal carbides, nitrides, and polar surface functional groups, are extraordinary materials for many applications including stimuli‐responsive actuators. Here, an extensive review on MXene‐based actuators in comparison with other 2D materials‐based actuators is reported, highlighting the main differences in view of chemical structure, mechanical properties, and electrical functionalities. First, since MXenes are newcomers in the field of actuators, their properties are explained including cation and ionic liquid intercalation, high capacitance, good electrical and thermal conductivity, excellent electromagnetic wave absorption, hydrophilicity, and outstanding dispersion in many polar solvents. Second, electro‐ionic, electrochemical, electrothermal, photothermal, and humidity‐responsive MXene‐based actuators are comprehensively addressed with detailed actuation mechanisms, focusing on electro‐ionic soft actuators. Third, several applications of those actuators are summarized with an emphasis on soft robotics and future directions of MXene‐based actuators are suggested.
Funding Information
  • National Research Foundation of Korea

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