School of Music and Dance, Xihua University, Chengdu, China.
College of Materials Science and Engineering, Sichuan University, Chengdu, China.
PLoS One. 2024 Aug 15;19(8):e0306866. doi: 10.1371/journal.pone.0306866. eCollection 2024.
Low-dimensional materials have demonstrated strong potential for use in diverse flexible strain sensors for wearable electronic device applications. However, the limited contact area in the sensing layer, caused by the low specific surface area of typical nanomaterials, hinders the pursuit of high-performance strain-sensor applications. Herein, we report an efficient method for synthesizing TiO2-based nanocomposite materials by directly using industrial raw materials with ultrahigh specific surface areas that can be used for strain sensors. A kinetic study of the self-seeded thermal hydrolysis sulfate process was conducted for the controllable synthesis of pure TiO2 and related TiO2/graphene composites. The hydrolysis readily modified the crystal form and morphology of the prepared TiO2 nanoparticles, and the prepared composite samples possessed a uniform nanoporous structure. Experiments demonstrated that the TiO2/graphene composite can be used in strain sensors with a maximum Gauge factor of 252. In addition, the TiO2/graphene composite-based strain sensor showed high stability by continuously operating over 1,000 loading cycles and aging tests over three months. It also shows that the fabricated strain sensors have the potential for human voice recognition by characterizing letters, words, and musical tones.
低维材料在用于可穿戴电子设备的各种柔性应变传感器方面显示出了强大的应用潜力。然而，由于典型纳米材料的比表面积较低，传感层中的接触面积有限，这限制了高性能应变传感器应用的发展。在此，我们报告了一种通过直接使用具有超高比表面积的工业原料来合成基于 TiO2 的纳米复合材料的有效方法，该材料可用于应变传感器。通过自种子热水解硫酸盐法的动力学研究，实现了纯 TiO2 及其相关 TiO2/石墨烯复合材料的可控合成。水解过程很容易改变所制备的 TiO2 纳米颗粒的晶型和形态，且制备的复合样品具有均匀的纳米多孔结构。实验表明，TiO2/石墨烯复合材料可用作应变传感器，其应变系数最大值可达 252。此外，基于 TiO2/石墨烯复合材料的应变传感器经过 1000 多次加载循环和三个月的老化测试，仍表现出较高的稳定性。该应变传感器还通过对字母、单词和音调的特征分析，展示了其在人类语音识别方面的应用潜力。
