Twistable and Stretchable Sandwich Structured Fiber for Wearable Sensors and Supercapacitors
Twistable and Stretchable Sandwich Structured Fiber for Wearable Sensors and Supercapacitors
复制标题
DOI：
10.1021/acs.nanolett.6b03739
复制
发表时间：
2016-12-01
期刊：
影响因子：
10.8
通讯作者：
Baughman, Ray H.
中科院分区：
文献类型：
--
作者：
Choi, Changsoon;Lee, Jae Myeong;Baughman, Ray H.
未来的应用需要具有高性能的可扭曲和可拉伸的光纤电化学器件，包括新兴的可穿戴电子设备。这里介绍了编织光纤氧化还原超级电容器和应变传感器，其中包括夹在功能化弯曲的碳纳米管电极之间的介质层。在宏观尺度上，纤维的夹芯橡胶充当电容式应变传感的介质层和弹性衬底，防止在严重机械变形期间发生电气短路和不可逆的结构变化。在微观尺度上，弯曲的碳纳米管电极有效地吸收拉应力或剪应力，提供基本恒定的电导。因此，夹层纤维具有双重功能：(1)应变传感，在拉伸(200%)和巨大扭转(1700ra.m(-1)或270圈.m(-1)期间分别产生约115.7%和26%的电容变化；(2)电化学能量存储，提供高线性和面电容量(2.38mF.cm(-1)和11.88mF.cm(-2))，并在大机械变形下保持95%以上的初始能量存储能力。
Twistable and stretchable fiber-based electrochemical devices having high performance are needed for future applications, including emerging wearable electronics. Weavable fiber redox supercapacitors and strain sensors are here introduced, which comprise a dielectric layer sandwiched between functionalized buckled carbon nanotube electrodes. On the macroscopic scale, the sandwiched core rubber of the fiber acts as a dielectric layer for capacitive strain sensing and as an elastomeric substrate that prevents electrical shorting and irreversible structural changes during severe mechanical deformations. On the microscopic scale, the buckled CNT electrodes effectively absorb tensile or shear stresses, providing an essentially constant electrical conductance. Consequently, the sandwich fibers provide the dual functions of (1) strain sensing, by generating approximately 115.7% and 26% capacitance changes during stretching (200%) and giant twist (1700 rad.m(-1) or 270 turns.m(-1)), respectively, and (2) electrochemical energy storage, providing high linear and areal capacitances (2.38 mF.cm(-1) and 11.88 mF.cm(-2)) and retention of more than 95% of initial energy storage capability under large mechanical deformations.