Liu Xuan, Hou Jian, Ou Jingmei, Yan Manling
School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, P. R. China.
Small. 2024 May;20(20):e2308398. doi: 10.1002/smll.202308398. Epub 2023 Dec 10.
Temperature measurements with high spatial resolution and accuracy can provide crucial data for understanding the changing process of microregion. Non-contact ratiometric fluorescence thermometers have received widespread attention for their sensitivity and interference resistibility. However, polymer and organic dye thermometers with such ratiometric fluorescence are very rare, and their applicability and processability are limited. In this study, novel tridurylboron compounds PPB1, PPB2, and PPB3 are designed and synthesized. They exhibit significant temperature responsive ratiometric fluorescence when dispersed in thermoplastic polyurethane elastomers (TPU). With a self-referencing feature and protection of TPU solid polymer, such fluorescence thermometers possess strong interference resistibility. From -10° to 60 °C, the fluorescence peak of PPB1-TPU system redshifted by 41 nm, the fluorescence color changes from blue to green. For the fluorescence ratiometric temperature measurement procedure, the absolute sensitivity is 14.5% °C (40 °C) and relative sensitivity is 6.3% °C (35 °C), which is much higher than reported solid polymer fluorescence thermometers. The temperature-responsive ranges can be adjusted by altering the types of polymer substrate and the number of the substituents. Such tridurylboron-TPU polymer fluorescence thermometers can be applied in aqueous environment and processed into devices of various shapes and sizes, demonstrating great potential for application.
具有高空间分辨率和精度的温度测量能够为理解微区变化过程提供关键数据。非接触式比率荧光温度计因其灵敏度和抗干扰性而受到广泛关注。然而，具有这种比率荧光的聚合物和有机染料温度计非常罕见，其适用性和可加工性也受到限制。在本研究中，设计并合成了新型三硬脂基硼化合物PPB1、PPB2和PPB3。当它们分散在热塑性聚氨酯弹性体（TPU）中时，表现出显著的温度响应比率荧光。由于具有自参考特性以及TPU固体聚合物的保护，此类荧光温度计具有很强的抗干扰性。在-10°C至60°C范围内，PPB1-TPU体系的荧光峰红移了41nm，荧光颜色从蓝色变为绿色。对于荧光比率温度测量过程，绝对灵敏度为14.5%/°C（40°C时），相对灵敏度为6.3%/°C（35°C时），远高于已报道的固体聚合物荧光温度计。温度响应范围可通过改变聚合物基质的类型和取代基数量来调节。此类三硬脂基硼-TPU聚合物荧光温度计可应用于水性环境，并加工成各种形状和尺寸的器件，展现出巨大的应用潜力。
