Measurement of the Photothermal Conversion Efficiency of CNT Films Utilizing a Raman Spectrum

Autor: Yu Liu, Zhicheng Lin, Pengfei Wang, Feng Huang, Jia-Lin Sun

Médium: Article
Vydáno: MDPI AG 2022-03-01

Popis

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<sup>+</sup> peak and the temperature of a CNT, the offset of the G<sup>+</sup> 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<sup>−1</sup> at 532 nm) of this device demonstrated the effectiveness of our method.