Humidity sensors have become an essential need for improving daily life quality. Here, a novel humidity sensitive fiber was fabricated using the soft polydimethylsiloxane (PDMS) as the core layer and the non-swellable polyvinylidenedifluoride (PVDF) embedded with a swellable MIL-88A as the outer layer. Noticeably, the PDMS fiber was chosen as a carrier due to its smoothness, softness and good tensile properties. The isoreticular Fe^III dicarboxylate MIL-88 family with swellable metal–organic frameworks (MOFs) can undergo reversible dynamic structural transformations with a response to external humidity change. The resulted fiber with swellable MOFs showed three kinds of deformation for a single solvent and also had good deformation performance for two-component miscible solution with different volume ratios. As a proof of concept, a shape-memory effect at relative humidity from 10 to 90% and the simulated salt solutions instead of relative humidity changes were used to evaluate humidity change. In addition, a deep insight into the self-shape-change mechanism among those phenomena was investigated, wherein expansion deformation of the PDMS fiber as well as the structural transformation of the MIL-88A worked in different conditions.

湿度传感器已经成为改善日常生活质量的基本需求。在此，使用柔软的聚二甲基硅氧烷（PDMS）作为芯层，并嵌入了可溶胀的MIL-88A作为外层，将不可溶胀的聚偏二氟乙烯（PVDF）制成了新型的湿敏纤维。值得注意的是，PDMS纤维由于其光滑度，柔软度和良好的拉伸性能而被选作载体。等网状Fe ^III具有可溶金属-有机骨架（MOF）的二羧酸MIL-88系列可响应外部湿度变化而经历可逆的动态结构转变。得到的具有可溶胀的MOF的纤维在单一溶剂中表现出三种变形，并且在不同体积比的两组分混溶溶液中也具有良好的变形性能。作为概念证明，相对湿度在10％到90％之间的形状记忆效应和模拟盐溶液代替了相对湿度变化被用于评估湿度变化。此外，还研究了对这些现象中自变形机制的深入了解，其中PDMS纤维的膨胀变形以及MIL-88A的结构转变在不同条件下起作用。