Cuiling Zhang, Qi Zhang, Xinran Li, Wang Zhan, Yongliang Han, Zeying Zhang, Wei Su, Li Xue, Wei Zhang, Ke Zhou, Shaoming Pan, Niancai Peng, Zhilu Ye, Bin Peng, Xiaohui Zhang
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引用次数: 0
摘要
能够检测外部磁场的磁阻(MR)传感器在人机交互界面和生物医学设备中日益受到关注。然而,现有的磁阻传感器通常由坚硬而笨重的材料制成,无法满足皮肤电子设备对灵活性和生物兼容性的要求。本研究报告了一种柔性和生物相容性各向异性磁阻(AMR)薄膜,该薄膜以交联蚕丝为基底,并具有镍钴功能层,可用于皮肤监测应用。氢键和交联网络的协同作用增强了丝膜的柔韧性和机械稳定性,形成了无定形的纠缠网络,减少了大而紧凑的β片状晶体的存在。所开发的 AMR 的 AMR 率高达 1.03%,与刚性 AMR 传感器的 AMR 率相当。在外部磁场下,丝基 AMR 能够监测其旋转(0-90°)、弯曲(半径 10-60 毫米)和与磁体的距离(0-10 厘米)。此外,我们还将柔性 AMR 实际应用于皮肤界面应用,包括关节运动(如手腕、脚踝和手指运动)检测和翻页控制。所提出的柔性磁性薄膜为开发磁敏电子皮肤和可穿戴传感器铺平了道路。
Flexible Silk Film Based on Synergy of Hydrogen Bond and Cross-linking Network for Magnetic Sensitive Skin
Magnetoresistive (MR) sensors with the ability to detect the external magnetic fields have attracted increasing attention in interactive human-machine interfaces and biomedical devices. However, existing MR sensors are typically constructed from rigid and bulky materials, failing to satisfy the flexibility and biocompatibility requirements for on-skin electronics. In this study, a flexible and biocompatible anisotropic magnetoresistance (AMR) film with a cross-linked silk substrate and a NiCo functional layer is reported for on-skin monitoring applications. The synergy of hydrogen bond and cross-linking network enhances the flexibility and mechanical stability of the silk film by forming an amorphous entanglement network with a reduced presence of large and compact β-sheet crystals. The developed AMR exhibits a high AMR ratio of 1.03%, comparable to those obtained with rigid AMR sensors. Under external magnetic fields, the silk-based AMR demonstrates the ability in monitoring its rotation (0–90°), bending (radius 10–60 mm), and distance (0–10 cm) to the magnet. Furthermore, we practically implement the flexible AMR for skin-interfaced applications, including the detection of the joint motions (e.g. wrist, ankle, and finger movements) and the control of turning pages. The proposed flexible magnetic film paves the way for the development of magnetosensitive electronic skins and wearable sensors.
期刊介绍:
The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.