▎ 摘　　要

NOVELTY - Composite comprises a polymer network comprising pectin or a pectin derivative, a low-molecular compound having a hydrophilic group in the polymer network, and a polyvalent metal ion coordinated with an anion present in a polymer chain of the polymer network. USE - The composite is used in an infrared absorber, a thin film, a photoelectric device, and an electronic device (all claimed) such as thin film transistors, photodetectors, photoelectric devices, solar cells, organic LED displays, and organic sensors, a stretchable human motion sensor, a stretchable artificial muscle, or a stretchable actuator, a camera, a camcorder, a mobile phone, a display device, a security device, or a medical device. ADVANTAGE - The composite improves stretchability while maintaining improved charge mobility and electrical properties, and is applied to electronic devices requiring high stretchability and healing ability.