**Preface to "Polymer Materials in Sensors, Actuators and Energy Conversion"**

Polymer-based materials applications in sensors, actuators, and energy conversion are playing a key role in these recent developing areas of smart matter and electronic devices. These areas cover the synthesis, structures, and properties of polymers and composites, including energy-harvesting devices and energy-storage devices for electromagnetic (electrical to mechanical energy conversion) and magneto-mechanical (magnetic to mechanical energy conversion), light-emitting devices, and electrically driving sensors. Therefore, the modulation of the polymer-based materials and devices for controlling the detection, actuation, and energy with functional relative device can be achieved.

> **Jung-Chang Wang** *Editor*
