Thermochromic photonic crystals (PC) have been extensively studied owing to their potential applications in displays, smart windows, sensors, and anti-counterfeiting devices. However, the poor water-retention capacity of the traditional hydrogel-based thermoresponsive PCs makes them unstable, and their color change is realized by immersion in water. Although polymer elastomer-based PC can increase stability, their response range as well as sensitivity is dramatically decreased. In this study, an ultrathin polymer-filled ZnS@SiO₂ PC film with long-term stability and ultrasensitive thermochromism is presented. The polymer provides the film with excellent stability, and the ultrathin PC structure ensures that the film exhibits distinguished thermochromism in air rather than in water, owing to condensation. The structural color changed from violet to near-infrared, and the change in the reflection wavelength was as high as 300 nm when the temperature decreased from 15 °C to 5 ^oC. Furthermore, an ultrathin PC layer was applied to fabricate thermochromic smart fabrics. This work demonstrates the design and fabrication of ultrathin PC films, as well as their ultrasensitive response and high stability, presenting a platform for combining different types of functionalized polymer materials and achieving more ingenious responsive effects.

热致变色光子晶体 (PC) 因其在显示器、智能窗、传感器和防伪设备中的潜在应用而得到了广泛的研究。然而，传统的基于水凝胶的热响应PC的保水能力较差，使其不稳定，其颜色变化是通过浸入水中来实现的。尽管基于聚合物弹性体的 PC 可以提高稳定性，但它们的响应范围和灵敏度却大大降低。在本研究中，一种超薄聚合物填充的 ZnS@SiO ₂介绍了具有长期稳定性和超灵敏热致变色的PC薄膜。该聚合物为薄膜提供了出色的稳定性，超薄的 PC 结构确保薄膜在空气中而不是在水中由于冷凝而表现出显着的热致变色性。^{结构颜色由紫色变为近红外，当温度从15℃降至5 ℃}时，反射波长变化高达300nm 。此外，应用超薄PC层制备热致变色智能织物. 这项工作展示了超薄PC薄膜的设计和制造，以及它们的超灵敏响应和高稳定性，为结合不同类型的功能化聚合物材料并实现更巧妙的响应效果提供了一个平台。