Chen Xiang, Qu Ruiyang, Liu Hao, Yao Lu, Xu Zhenyu, Hu Mai, Wang Wei, Kan Ruifeng
Opt Express. 2025 Jan 13;33(1):1394-1405. doi: 10.1364/OE.544764.
This paper demonstrates a customized quartz tuning fork (QTF) coated with the titanium carbide (TiCT) MXene film that can effectively enhance the sensitivity of light-induced thermoelastic spectroscopy (LITES). The MXene film is coated at the root of the customized QTF. The film area is proven to have little impact on resonance frequency, bandwidth, quality factor, and amplitude of the second harmonic signal (2) based on the fundamental flexural mode. With an optimum film thickness of 1.9 µm, the signal-to-noise ratio (SNR) of the light-induced thermoelastic signal is enhanced up to 8.7 times. A similar enhancement of 2 signals was observed at the overtone frequency. Despite the higher quality factor, the SNR of the 2 signal inspired at the overtone frequency is much lower than that of the 2 signal inspired at the fundamental frequency. Moreover, similar experimental results are observed on the commercial QTF coated with MXene film. The absorption coefficient from 1260 nm to 1680 nm of the MXene film is measured to be larger than 92%. Hence, the MXene film enables a promising application prospect for the LITES system in multiple gas measurements.
本文展示了一种定制的涂有碳化钛（TiCT）MXene薄膜的石英音叉（QTF），其可有效提高光致热弹性光谱（LITES）的灵敏度。MXene薄膜涂覆在定制QTF的根部。基于基本弯曲模式，已证明薄膜面积对共振频率、带宽、品质因数和二次谐波信号（2）的幅度影响很小。在最佳薄膜厚度为1.9 µm时，光致热弹性信号的信噪比（SNR）提高了8.7倍。在泛音频率处观察到二次谐波信号有类似增强。尽管品质因数较高，但在泛音频率激发的二次谐波信号的SNR远低于在基频激发的二次谐波信号的SNR。此外，在涂有MXene薄膜的商用QTF上也观察到了类似的实验结果。测得MXene薄膜在1260 nm至1680 nm的吸收系数大于92%。因此，MXene薄膜为LITES系统在多种气体测量中提供了广阔的应用前景。
