Abstract Luminescent films have received great interest for chemo-/bio-sensing applications owing to their distinct advantages over solution-based probes, including their good stability; ease of storage, transport, and recycling; tunable shape and size; and non-invasive nature. In this study, mechanically stable polyurethane/carbon dot (PU/CDs) composite films with dual-emission for ratiometric temperature sensing were prepared. The films exhibited good light transmissivity, flexibility, and ductility. The obtained PU/CDs hybrid films with dual emission exhibited temperature response and reversible properties from 10 °C to 90 °C. At the appropriate reactive ratio of CDs to PU, the fluorescent color of the films shifted over a relatively large range from blue to green to yellow over a large temperature range. These findings indicate that the stretchable hybrid PU/CDs composite films could potentially be applied for colorimetric detection over a large temperature range (10 °C–90 °C). These materials thus have high application value for macroscopic dual-light temperature detection as well as further development of polymer composite modification.

中文翻译：

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用于比色温度传感的双发射聚氨酯/碳点热敏复合薄膜的制备

摘要 发光薄膜由于与基于溶液的探针相比具有明显的优势，包括其良好的稳定性，因此在化学/生物传感应用中受到了极大的关注。易于储存、运输和回收；可调整的形状和大小；和非侵入性。在这项研究中，制备了机械稳定的聚氨酯/碳点 (PU/CDs) 复合薄膜，具有双发射用于比率温度传感。薄膜表现出良好的透光性、柔韧性和延展性。获得的具有双发射的 PU/CDs 混合薄膜表现出温度响应和从 10°C 到 90°C 的可逆特性。在 CD 与 PU 的适当反应比下，薄膜的荧光颜色在较大的温度范围内从蓝色到绿色再到黄色的相对较大范围内变化。这些发现表明，可拉伸的混合 PU/CDs 复合薄膜有可能应用于大温度范围（10°C-90°C）的比色检测。因此，这些材料对于宏观双光温度检测以及聚合物复合改性的进一步发展具有较高的应用价值。