Li Hai, Song Hoseong, Long Mengjie, Saeed Ghuzanfar, Lim Sooman
Department of Flexible and Printable Electronics, LANL-JBNU Engineering Institute, Jeonbuk National University, Jeonju, 54896, Republic of Korea.
Wuhan Chamtop New Materials Co., Ltd., Heping Street 1540, Wuhan 430080, China.
Nanoscale. 2021 Feb 4;13(4):2542-2555. doi: 10.1039/d0nr07525f.
Self-powered wearable sensors exhibiting high sensitivity and flexibility have attracted widespread interest in the field of wearable electronics. Herein, a 3D printing technique was employed to fabricate a fully printed, flexible self-powered sensor with high piezoelectric performance. This printing technique is based on the hydrophobic surface-functionalized barium titanate (FD-BTO)/polyvinylidene fluoride (PVDF) composite film. To strengthen the interface bond between BTO and PVDF, the BTO nanoparticles were surface functionalized using hydrophobic 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES). As a result, there was an increase in the content of the β-phase in the PFDTES modified BTO (FD-BTO) nanoparticle composite film. The 3D-printed self-powered sensor based on the optimum FD-BTO/PVDF composite film exhibited excellent sensitivity (61.6 mV kPa-1) with a piezoelectric coefficient (d33) of 69.1 pC/N, which is two-fold higher than that of the unfunctionalized BTO/PVDF counterpart. Additionally, the power sensor displayed excellent mechanical durability in the 20 000 cyclic force tests. In practice, the printed devices were used as a sports wearable device to monitor and analyze athlete motion, and a self-powered printed sensor array (5 × 5), which could effectively detect the pattern image of the external pressure input. The 3D-printed self-powered sensor demonstrated herein can contribute significantly to the applications and the development of printed electronic wearable devices.
具有高灵敏度和柔韧性的自供电可穿戴传感器在可穿戴电子领域引起了广泛关注。在此，采用3D打印技术制造了一种具有高压电性能的全印刷柔性自供电传感器。这种打印技术基于疏水表面功能化的钛酸钡（FD-BTO）/聚偏氟乙烯（PVDF）复合膜。为了加强BTO与PVDF之间的界面结合，使用疏水性的1H，1H，2H，2H-全氟癸基三乙氧基硅烷（PFDTES）对BTO纳米颗粒进行表面功能化。结果，PFDTES改性的BTO（FD-BTO）纳米颗粒复合膜中β相的含量增加。基于最佳FD-BTO/PVDF复合膜的3D打印自供电传感器表现出优异的灵敏度（61.6 mV kPa-1），压电系数（d33）为69.1 pC/N，比未功能化的BTO/PVDF对应物高出两倍。此外，该功率传感器在20000次循环力测试中显示出优异的机械耐久性。在实际应用中，打印设备被用作运动可穿戴设备来监测和分析运动员的运动，以及一个自供电的打印传感器阵列（5×5），它可以有效地检测外部压力输入的图案图像。本文展示的3D打印自供电传感器可为印刷电子可穿戴设备的应用和发展做出重大贡献。
