Yin Shikang, Tan Richao, Wang Sitian, Yuan Yuan, Huang Kaiyan, Wang Ziying, Zhang Shijie, Khan Sadaf Bashir, Yuan Weifeng, Hu Ning
Key Laboratory of Testing Technology for Manufacturing Process, Ministry of Education, School of Manufacturing Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China.
College of Mechanical and Vehicle Engineering, Chongqing University, Chongqing 400044, China.
Nanomaterials (Basel). 2025 Jun 26;15(13):997. doi: 10.3390/nano15130997.
A flexible and highly sensitive piezoresistive strain sensor was fabricated through the application of CO laser ablation on a composite film composed of multi-walled carbon nanotubes, carbon black, and polydimethylsiloxane (MWCNT/CB/PDMS). The results of scanning electron microscopy (SEM) surface analysis shows that the "bush-like" conductive structure on the PDMS-based composite material membrane post-laser ablation is formed. Transmission electron microscopy (TEM) images and X-ray diffraction (XRD) spectra of the ablation products indicated the formation of an amorphous carbon layer on the surface of carbon nanomaterials due to laser ablation. Experimental findings revealed that the sensitivity (GF) value of the sensor based on CNT0.6CB1.0-P3.0 is up to 584.7 at 5% strain, which is approximately 14% higher than the sensitivity 513 of the sensor previously prepared by the author using CO laser ablation of MWCNT/PDMS composite films. The addition of a very small volume fraction of CB particles significantly enhances the piezoresistive sensitivity of the sensor samples. Combined with the qualitative analysis of microscopic morphology characterization, CB and MWCNT synergistically promote the deposition of amorphous carbon. This phenomenon increases the probability of tunnel effect occurrence in the strain response region of the sensor, which indirectly confirms the synergistic enhancement effect of the combined action of CB and MWCNT on the piezoresistive sensitivity of the sensor.
通过在由多壁碳纳米管、炭黑和聚二甲基硅氧烷（MWCNT/CB/PDMS）组成的复合薄膜上应用CO激光烧蚀，制备了一种柔性且高灵敏度的压阻应变传感器。扫描电子显微镜（SEM）表面分析结果表明，激光烧蚀后的PDMS基复合材料膜上形成了“灌木状”导电结构。烧蚀产物的透射电子显微镜（TEM）图像和X射线衍射（XRD）光谱表明，由于激光烧蚀，碳纳米材料表面形成了非晶碳层。实验结果表明，基于CNT0.6CB1.0-P3.0的传感器在5%应变下的灵敏度（GF）值高达584.7，比作者之前使用CO激光烧蚀MWCNT/PDMS复合薄膜制备的传感器的灵敏度513高出约14%。添加非常小体积分数的CB颗粒显著提高了传感器样品的压阻灵敏度。结合微观形态表征的定性分析，CB和MWCNT协同促进了非晶碳的沉积。这种现象增加了传感器应变响应区域中隧道效应发生的概率，间接证实了CB和MWCNT联合作用对传感器压阻灵敏度的协同增强效应。
