Khakpour Elnaz, Sadeghzadeh Sadegh
Department of Nanotechnology Engineering, Smart Micro/Nanoelectromechanical Systems (SMNEMS) Lab, School of Advanced Technologies, Iran University of Science and Technology, Tehran, Iran.
Phys Chem Chem Phys. 2024 Oct 30;26(42):26871-26885. doi: 10.1039/d4cp03085k.
This paper reports a flexible and wearable piezoresistive strain sensor composed of the LIG/PDMS nanocomposite. LIG was first prepared on commercial Kapton tape by CO laser scanning. The presence of carbon atoms and their high ratio compared to oxygen atoms were confirmed using XPS, XRD, and Raman tests. FESEM images also showed the presence of multilayer graphene sheets in a porous foam. The strain sensor was fabricated by transferring LIG to a PDMS elastic polymer substrate. This sensor exhibits high sensitivity (GF = 78.2), low hysteresis, and a wide working range (strains of 1-100%). It also has a stable and fast dynamic response and provides good reversibility and repeatability. After 10 000 cycles, the signal peak changed only 2%, indicating its long-term durability and stability. The Au-enhanced sensor exhibits more regular response patterns and higher sensitivity (GF = 220.3). It showed a very low detection limit of 0.1%. In addition to positive SNR numbers at 0.1% strain, a high gauge factor of 45.8 was obtained, which is very high compared to that of most reported strain sensors and shows Au/LIG/PDMS sensor's great sensitivity at deficient strains. Gold deposition was performed in two ways (gold deposition on PI film and gold deposition on LIG). Au/LIG-based sensors, with their unique characteristics, are well-suited for detecting subtle strains like those found in arterial pulses and blood pressure. This makes them strong contenders for tactile and wearable sensor applications. This LIG-based sensor holds great promise for the future development of wearable technology, such as flexible sensors integrated into clothing or even artificial skin.
本文报道了一种由LIG/PDMS纳米复合材料组成的柔性可穿戴压阻式应变传感器。LIG首先通过CO激光扫描在商用Kapton胶带制备。使用XPS、XRD和拉曼测试确认了碳原子的存在及其与氧原子相比的高比例。FESEM图像还显示在多孔泡沫中存在多层石墨烯片。通过将LIG转移到PDMS弹性聚合物基板上来制造应变传感器。该传感器具有高灵敏度（GF = 78.2）、低滞后和宽工作范围（应变1-100%）。它还具有稳定且快速的动态响应，并具有良好的可逆性和重复性。经过10000次循环后，信号峰值仅变化2%，表明其具有长期耐用性和稳定性。金增强传感器表现出更规则的响应模式和更高的灵敏度（GF = 220.3）。它显示出非常低的0.1%检测限。除了在0.1%应变下具有正的SNR值外，还获得了45.8的高应变系数，与大多数报道的应变传感器相比非常高，并且显示出Au/LIG/PDMS传感器在低应变下的高灵敏度。金沉积通过两种方式进行（在PI膜上沉积金和在LIG上沉积金）。基于Au/LIG的传感器具有独特的特性，非常适合检测动脉脉搏和血压中发现的细微应变。这使其成为触觉和可穿戴传感器应用的有力竞争者。这种基于LIG的传感器在可穿戴技术的未来发展中具有巨大潜力，例如集成到服装甚至人造皮肤中的柔性传感器。
