Technologies to monitor microenvironmental conditions and its spatial distribution are in high demand, yet remain unmet need. Herein, photonic microsensors are designed in a capsule format that can be injected, suspended, and implanted in any target volume. Colorimetric sensors are loaded in the core of microcapsules by assembling core–shell colloids into crystallites through the depletion attraction. The shells of the colloids are made of a temperature‐responsive hydrogel, which enables the crystallites to rapidly and widely tune the structural color in response to a change in temperature while maintaining close‐packed arrays. The spherical symmetry of the microcapsules renders them optically isotropic, i.e., displaying orientation‐independent color. In addition, as a solid membrane is used to protect the delicate crystallites from external stresses, their high stability is assured. More importantly, each microcapsule reports the temperature of its microenvironment so that a suspension of capsules can provide information on the spatial distribution of the temperature.

中文翻译：

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具有内置胶体微晶的光子胶囊传感器

监测微环境状况及其空间分布的技术的需求很高，但仍未得到满足。本文中，光子微传感器以胶囊形式设计，可以以任何目标体积进行注入，悬挂和植入。比色传感器通过耗散吸引将核壳胶体组装成微晶，从而将其装载在微胶囊的核中。胶体的外壳由温度响应型水凝胶制成，这使微晶能够响应温度变化而迅速且广泛地调节结构颜色，同时保持密排排列。微胶囊的球形对称性使其具有光学各向同性，即显示与方向无关的颜色。此外，由于使用固体膜来保护微妙的微晶免受外部压力，因此可以确保它们的高稳定性。更重要的是，每个微胶囊都报告其微环境的温度，这样胶囊的悬浮液就可以提供有关温度空间分布的信息。