The fluorescent nanocomposites of carbon nanoparticles grafted with N-isopropylacrylamide and spiropyran copolymers (f-CNP-g-poly(NIPAM-co-SP)) were successfully synthesized via reversible addition-fragmentation chain transfer polymerization. The synthesized f-CNP-g-poly(NIPAM-co-SP) nanocomposites could be well dissolved in water and retain the fluorescence of carbon nanoparticles, which could simultaneously fluoresce blue-green and red. The blue-green and red fluorescence of the f-CNP-g-poly(NIPAM-co-SP) nanocomposites dissolved in water could be reversibly switched under UV and visible light stimuli. When the temperature increased from room temperature (20 °C) to 38 °C, the blue-green fluorescence intensity decreased, the red fluorescence intensity increased, and the average hydrodynamic diameter of the f-CNP-g-poly(NIPAM-co-SP) nanocomposites increased due to aggregation. The fluorescent carbon nanoparticles were grafted with the copolymers of N-isopropylacrylamide and spiropyran (f-CNP-g-poly(NIPAM-co-SP)), which have dual responses to light and temperature stimuli when they are in an aqueous solution. The blue-green and red fluorescence of the f-CNP-g-poly(NIPAM-co-SP) nanocomposites dissolved in water could be reversibly switched under UV and visible light stimuli. Meanwhile, when the temperature increased from room temperature (20 °C) to 38 °C, the blue-green fluorescence intensity decreased, the red fluorescence intensity increased, and the average hydrodynamic diameter of the f-CNP-g-poly(NIPAM-co-SP) nanocomposites increased due to aggregation.

中文翻译：

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对光和温度刺激具有双重响应的 N-异丙基丙烯酰胺和螺吡喃共聚物接枝的荧光碳纳米粒子

通过可逆加成-断裂链转移聚合成功合成了接枝有 N-异丙基丙烯酰胺和螺吡喃共聚物 (f-CNP-g-poly(NIPAM-co-SP)) 的碳纳米颗粒的荧光纳米复合材料。合成的 f-CNP-g-poly(NIPAM-co-SP) 纳米复合材料可以很好地溶解在水中并保留碳纳米颗粒的荧光，碳纳米颗粒可以同时发出蓝绿色和红色荧光。溶解在水中的 f-CNP-g-poly(NIPAM-co-SP) 纳米复合材料的蓝绿色和红色荧光可以在紫外线和可见光刺激下可逆地转换。当温度从室温（20℃）升高到38℃时，蓝绿色荧光强度降低，红色荧光强度增加，f-CNP-g-poly(NIPAM-co-SP) 纳米复合材料的平均流体动力学直径由于聚集而增加。荧光碳纳米粒子与 N-异丙基丙烯酰胺和螺吡喃的共聚物 (f-CNP-g-poly(NIPAM-co-SP)) 接枝，当它们在水溶液中时，它们对光和温度刺激具有双重响应。溶解在水中的 f-CNP-g-poly(NIPAM-co-SP) 纳米复合材料的蓝绿色和红色荧光可以在紫外线和可见光刺激下可逆地转换。同时，当温度从室温（20℃）升高到 38℃时，蓝绿色荧光强度降低，红色荧光强度增加，f-CNP-g-poly(NIPAM- co-SP) 纳米复合材料由于聚集而增加。荧光碳纳米粒子与 N-异丙基丙烯酰胺和螺吡喃的共聚物 (f-CNP-g-poly(NIPAM-co-SP)) 接枝，当它们在水溶液中时，它们对光和温度刺激具有双重响应。溶解在水中的 f-CNP-g-poly(NIPAM-co-SP) 纳米复合材料的蓝绿色和红色荧光可以在紫外线和可见光刺激下可逆地转换。同时，当温度从室温（20℃）升高到 38℃时，蓝绿色荧光强度降低，红色荧光强度增加，f-CNP-g-poly(NIPAM- co-SP) 纳米复合材料由于聚集而增加。荧光碳纳米粒子与 N-异丙基丙烯酰胺和螺吡喃的共聚物 (f-CNP-g-poly(NIPAM-co-SP)) 接枝，当它们在水溶液中时，它们对光和温度刺激具有双重响应。溶解在水中的 f-CNP-g-poly(NIPAM-co-SP) 纳米复合材料的蓝绿色和红色荧光可以在紫外线和可见光刺激下可逆地转换。同时，当温度从室温（20℃）升高到 38℃时，蓝绿色荧光强度降低，红色荧光强度增加，f-CNP-g-poly(NIPAM- co-SP) 纳米复合材料由于聚集而增加。当它们在水溶液中时，它们对光和温度刺激有双重反应。溶解在水中的 f-CNP-g-poly(NIPAM-co-SP) 纳米复合材料的蓝绿色和红色荧光可以在紫外线和可见光刺激下可逆地转换。同时，当温度从室温（20℃）升高到 38℃时，蓝绿色荧光强度降低，红色荧光强度增加，f-CNP-g-poly(NIPAM- co-SP) 纳米复合材料由于聚集而增加。当它们在水溶液中时，它们对光和温度刺激有双重反应。溶解在水中的 f-CNP-g-poly(NIPAM-co-SP) 纳米复合材料的蓝绿色和红色荧光可以在紫外线和可见光刺激下可逆地转换。同时，当温度从室温（20℃）升高到 38℃时，蓝绿色荧光强度降低，红色荧光强度增加，f-CNP-g-poly(NIPAM- co-SP) 纳米复合材料由于聚集而增加。