Stretchable and wearable colorimetric patches based on thermoresponsive plasmonic microgels embedded in a hydrogel film
Stretchable and wearable colorimetric patches based on thermoresponsive plasmonic microgels embedded in a hydrogel film
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DOI：
10.1038/s41427-018-0086-6
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发表时间：
2018-09-20
影响因子：
9.7
通讯作者：
Ko, Hyunhyub
中科院分区：
文献类型：
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作者：
Choe, Ayoung;Yeom, Jeonghee;Ko, Hyunhyub
由于刺激响应型比色传感器能够简单、快速、廉价地可视化外部刺激，因此在各种工业和医疗应用中具有广阔的应用前景。在这里，我们展示了一种温度响应性的智能比色贴片，它基于嵌入在可拉伸水凝胶膜中的热响应性等离子体微凝胶。为了实现快速有效的热响应变色，通过在聚N-异丙基丙烯酰胺(PNIPAM)微凝胶表面修饰金纳米颗粒(AuNPs)制备了覆盆子形状的等离子体微凝胶，该微凝胶随着温度的变化表现出可逆的和应变不敏感的颜色变化(红色和灰色紫色之间)。含有等离子体微凝胶的智能比色贴片在很短的时间内(1 S)显示出显著的消光峰移动(176 Nm)，温度敏感分辨率为0.2℃。此外，通过添加剂和共聚单体可以微调等离子体微凝胶的转变温度，通过将不同转变温度的等离子体微凝胶膜组装成阵列贴片，可以在25-40℃的宽温度范围内进行精致的温度可视化。在概念验证演示中，一个独立的智能比色贴片被用作温度响应型执行器的空间温度扫描器和比色温度计，这可能适用于智能、可穿戴传感器和软机器人。
Stimuli-responsive colorimetric sensors are promising for various industrial and medical applications due to the capability of simple, fast, and inexpensive visualization of external stimuli. Here we demonstrate a thermoresponsive, smart colorimetric patch based on a thermoresponsive plasmonic microgel embedded in a stretchable hydrogel film. To achieve a fast and efficient thermoresponsive color change, raspberry-shaped plasmonic microgels were fabricated by decorating gold nanoparticles (AuNPs) on poly(N-isopropylacrylamide) (PNIPAM) microgels, which exhibit reversible and strain-insensitive color shifts (between red and grayish violet) in response to a temperature change. The smart colorimetric patch containing a plasmonic microgels exhibits a significant extinction peak shift (176 nm) in a short time (1 s), with a temperature-sensing resolution of 0.2 degrees C. Moreover, the transition temperature of the plasmonic microgel can be finely tuned by additives and comonomers, so that the exquisite temperature visualization can be conducted over a wide temperature range of 25-40 degrees C by assembling plasmonic microgel films with different transition temperatures into an array patch. For proof-of-concept demonstrations, a freestanding smart colorimetric patch was utilized as a spatial temperature scanner and a colorimetric thermometer for a thermoresponsive actuator, which is potentially applicable in smart, wearable sensors and soft robotics.