Liu Yu, Lin Zhicheng, Wang Pengfei, Huang Feng, Sun Jia-Lin
College of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, China.
State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.
Nanomaterials (Basel). 2022 Mar 27;12(7):1101. doi: 10.3390/nano12071101.
Because carbon nanotube (CNT) films have high photothermal conversion efficiency (PTCE), they have been widely used in bolometric and photothermoelectric photodetectors, seawater desalination, and cancer therapy. Here, we present a simple, quick, and non-destructive method to measure the PTCE of CNT films. According to the linear relationship between the Raman shift of the G peak and the temperature of a CNT, the offset of the G peak under varying excitation light power can characterize the changed temperature. Combining the simulation of the temperature distribution, the final value of the PTCE can be obtained. Finally, a CNT film with a high PTCE was chosen to be fabricated as a bolometric photodetector; a quite high responsivity (2 A W at 532 nm) of this device demonstrated the effectiveness of our method.
由于碳纳米管（CNT）薄膜具有高光热转换效率（PTCE），它们已被广泛应用于测辐射热和光热电探测器、海水淡化及癌症治疗领域。在此，我们提出一种简单、快速且无损的方法来测量CNT薄膜的PTCE。根据G峰的拉曼位移与CNT温度之间的线性关系，在不同激发光功率下G峰的偏移可以表征温度的变化。结合温度分布模拟，可得到PTCE的最终值。最后，选择具有高PTCE的CNT薄膜制作测辐射热探测器；该器件具有相当高的响应度（在532 nm处为2 A/W），证明了我们方法的有效性。
