Smart textiles responding to the ambient environment like temperature, humidity, and light are highly desirable to improve the comfortability and realize multifunctions. The bamboo yarn has merits like air permeability, biodegradability, and excellent heat dissipation performance, but it has not been prepared for responsive materials and smart textiles. In this paper, the moisture-responsive twisted bamboo yarns were plied to form a self-balanced torsional actuator and wrapped around a mandrel to form a coil, followed by water immersion and evaporation to fix the shape and serve as a tensile actuator. A torsional actuation of 64.4⋅ mm⁻¹ was realized for the twisted actuator in 4.2 s; a maximum elongation of 133% or contraction of 50% was achieved for a coiled tensile actuator with good cyclability. The porous structure of bamboo yarns helped improve the water absorbance speed and decrease the response time of moisture. The self-balanced two-ply physical structure and reversible generation of chemical phase after soaking in aqueous solution fixed internal stress and provided good cyclability. With the unique properties including aqueous water-induced shape fixation and moisture-induced actuation, the application of tensile actuation of bamboo yarns was demonstrated, showing promising prospects on smart textiles.

智能纺织品对温度、湿度和光线等周围环境做出响应，以提高舒适性和实现多功能性是非常可取的。竹纱具有透气性、可生物降解性和出色的散热性能等优点，但尚未为响应材料和智能纺织品做好准备。在本文中，将水分响应的加捻竹纱合股以形成自平衡扭转致动器，并缠绕在心轴上形成线圈，然后浸水和蒸发以固定形状并用作拉伸致动器。64.4⋅ mm ^{-1的扭转驱动}在 4.2 秒内实现了扭曲执行器；对于具有良好循环性的螺旋拉伸致动器，实现了 133% 的最大伸长或 50% 的收缩。竹纱的多孔结构有助于提高吸水速度并减少水分的响应时间。自平衡的两层物理结构和在水溶液中浸泡后化学相的可逆生成固定了内应力并提供了良好的循环性。凭借水致定形和水分致动等独特性能，竹纱线的拉伸致动得到了应用，在智能纺织品上展现出广阔的前景。