A core-shell nanocomposite based on carbon dots (CD)/Rhodamine B (RhB) is realized by a facile method. The composite particles show spherical shape with narrow size distribution, non-agglomeration and smooth surface. The as-obtained nanocomposite shows the characteristic dual-emission of thermal-stable CD blue emission and thermal-sensitive RhB red emission at a single excitation wavelength. The fluorescence intensity ratio (FIR) is found to have a good linear relationship (R² > 0.993) with temperature, while the corresponding maximum absolute and relative sensitivity is 2.01% K⁻¹ and 1.39% K⁻¹ in range of 283–373 K. The research provides a simple approach to create novel dual-emitting nanocomposites for temperature sensing application in micron-scale and biological field.

通过简便的方法实现了基于碳点（CD）/若丹明B（RhB）的核-壳纳米复合材料。复合颗粒呈球形，粒度分布窄，不团聚，表面光滑。如此获得的纳米复合材料在单个激发波长下表现出热稳定的CD蓝色发射和热敏RhB红色发射的双重发射特征。发现荧光强度比（FIR） 与温度具有良好的线性关系（R ² > 0.993），而相应的最大绝对和相对灵敏度分别为2.01％K ^-1和1.39％K ^-1 在283–373 K范围内。该研究提供了一种简单的方法来创建新颖的双发射纳米复合材料，用于微米级和生物领域的温度传感应用。