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. 2022 Mar 27;12(7):1101.
doi: 10.3390/nano12071101.

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

Yu Liu  1 , Zhicheng Lin  1 , Pengfei Wang  1 , Feng Huang  1 , Jia-Lin Sun  2
Affiliations

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

Yu Liu et al. Nanomaterials (Basel). .

Abstract

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-1 at 532 nm) of this device demonstrated the effectiveness of our method.

Keywords: CNT film; Raman shift; photothermal conversion efficiency.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Raman shift of G+ peak as a function of the temperature for CNT films.
Figure 2
Figure 2
(a) Optical image of Sample 1; (b) Raman spectra of Sample 1 under different excitation powers; (c) Optical image of Sample 2; (d) Raman spectra of Sample 2 under different excitation powers. The middle part between the two black dash lines is the suspended CNT film. The widths of the trenches for Sample 1 and Sample 2 are both 120 μm. The crosses mark the probe points.
Figure 3
Figure 3
Raman spectra of Sample 1 and Sample 2.
Figure 4
Figure 4
(a) Optical image of Sample 3, in which the position of blue cross marks point 1 and the position of red cross marks point 2; (b) Raman spectra of point 1 at different excitation light powers; (c) Raman spectra of point 2 at different excitation light powers.
Figure 5
Figure 5
Simulated in-plane temperature distribution for (a) Sample 1, and (c) Sample 2. The temperature distributions of (b) Sample 1 and (d) Sample 2 along x axis at the center.
Figure 6
Figure 6
(a) I–V characteristic curve, whose linear range was extended to 0.8 V; (b) Photoresponse curve under 532 nm laser illumination in air; bias voltage was 0.8 V. The dark current was subtracted.
See this image and copyright information in PMC

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