Temperature measurement plays a pivotal role in both everyday life and industrial production. The utilization of flexible temperature sensors has gained significant attention due to their exceptional flexibility, which allows for greater adaptability in various application environments. This paper introduces a straightforward and efficient approach to manufacturing a graphene-based flexible temperature sensor. Laser-induced graphene (LIG) was synthesized from phenolic resin (PR) irradiated by flat-top shaping femtosecond laser. The resulting LIG was thoroughly characterized using SEM, Raman spectroscopy, and XPS. The flexible temperature sensor was prepared based on LIG. The sensor has a sensitivity of 0.78% /°C and a linear response over a temperature range of 25-75°C. The application potential of PRbased LIG extends to human physiological health monitoring, wearable devices, and various other fields.
The study compared the enhancement effects of vertically polarized double pulse (DP) and quadruple pulse (QP) femtosecond lasers on the laser-induced breakdown spectrum (LIBS) of fused silica, and by analyzing the ratio of multi-pulse ablation volume to single pulse and the change of surface morphology, combined with electron dynamics to explain the mechanism. The results show that at 0.47ps and 7.68ps delay, the ablation volume change caused by photon absorption plays a leading role in the enhancement of LIBS signal, and the signal intensity of DP and QP LIBS is almost the same; at 15.42ps delay, the volume ratio of multi-pulse ablation is basically unchanged, plasma reheating and slow plume component reionization play a leading role, QP signal enhancement effect is stronger than DP, but the ablation volume is only 1/2 of DP. The results show that for dielectric materials such as fused silica, the LIBS of QP femtosecond laser can achieve higher spatial detection resolution than DP, under the premise of ensuring that the excited plasma intensity is not weak or even stronger
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