Center on Nanoenergy Research, School of Physical Science and Technology, Guangxi University, Nanning, 530004, China.
CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400, China.
Adv Sci (Weinh). 2022 Dec;9(34):e2204519. doi: 10.1002/advs.202204519. Epub 2022 Oct 17.
Aerogels have been attracting wide attentions in flexible/wearable electronics because of their light weight, excellent flexibility, and electrical conductivity. However, multifunctional aerogel-based flexible/wearable electronics for human physiological/motion monitoring, and energy harvest/supply for mobile electronics, have been seldom reported yet. In this study, a kind of hybrid aerogel (GO/CNT HA) based on graphene oxide (GO) and carboxylated multiwalled carbon nanotubes (CMWCNTs) is prepared which can not only used as piezoresistive sensors for human motion and physiological signal detections, but also as high performance triboelectric nanogenerator (TENG) coupled with both solid-solid and gas-solid contact electrifications (CE). The repeatedly loading-unloading tests with 20 000 cycles exhibit its high and ultrastable piezoresistive sensor performances. Moreover, when the obtained aerogel is used as the electrode of a TENG, high electric output performance is produced due to the synergistic effect of solid-solid, and gas-solid interface CEs (3D electrification: solid-solid interface CE between the two solid electrification layers; gas-solid interface CE between the inner surface of GO/CNT HA and the air filled in the aerogel pores). This kind of aerogel promises good applications for human physiological/motion monitoring and energy harvest/supply in flexible/wearable electronics such as piezoresistive sensors and flexible TENG.
气凝胶因其重量轻、柔韧性好和导电性而在柔性/可穿戴电子产品中引起了广泛的关注。然而，用于人体生理/运动监测以及为移动电子设备进行能量收集/供应的多功能基于气凝胶的柔性/可穿戴电子产品，目前报道甚少。在本研究中，制备了一种基于氧化石墨烯（GO）和羧基化多壁碳纳米管（CMWCNTs）的杂化气凝胶（GO/CNT HA），它不仅可用作压阻传感器来检测人体运动和生理信号，还可用作具有固-固和气-固接触起电（CE）两种模式的高性能摩擦纳米发电机（TENG）。经过 20000 次的反复加载-卸载测试，其表现出了超高的和超稳定的压阻传感器性能。此外，当获得的气凝胶用作 TENG 的电极时，由于固-固和气-固界面 CE 的协同作用（3D 起电：两个固体带电层之间的固-固界面 CE；GO/CNT HA 内表面与充满气凝胶孔的空气之间的气-固界面 CE），产生了高的发电性能。这种气凝胶有望在柔性/可穿戴电子产品（如压阻传感器和柔性 TENG）中的人体生理/运动监测和能量收集/供应方面得到很好的应用。
