Photonic Capsule Sensors with Built-In Colloidal Crystallites
Photonic Capsule Sensors with Built-In Colloidal Crystallites
复制标题
DOI：
10.1002/adma.201803387
复制
发表时间：
2018-10-25
影响因子：
29.4
通讯作者：
Kim, Shin-Hyun
中科院分区：
文献类型：
--
作者：
Choi, Tae Min;Je, Kwanghwi;Kim, Shin-Hyun
监测微环境条件及其空间分布的技术需求很高，但仍未得到满足。在本文中，光子微传感器被设计成胶囊形式，其可以被注射、悬浮和植入任何目标体积中。通过耗尽吸引将核壳胶体组装成微晶，将比色传感器负载在微胶囊的核中。胶体的外壳由温度响应性水凝胶制成，这使得微晶能够响应温度变化快速且广泛地调节结构颜色，同时保持紧密堆积的阵列。微胶囊的球形对称性使它们具有光学各向同性，即，显示与方向无关的颜色。此外，由于使用固体膜来保护脆弱的微晶免受外部应力的影响，因此确保了它们的高稳定性。更重要的是，每个微胶囊报告其微环境的温度，使得胶囊的悬浮液可以提供关于温度的空间分布的信息。
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.