Li Lei, Zhang Jiaming, Song Yang, Dan Ronghui, Xia Xiaojuan, Zhao Jiang, Xu Rongqing
College of Electronic and Optical Engineering & College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210023, P. R. China.
Nanjing University of Science and Technology Zijin College, 89 Wenlan Road, Nanjing 210023, P. R. China.
ACS Appl Mater Interfaces. 2024 Jul 3;16(26):33981-33992. doi: 10.1021/acsami.4c05993. Epub 2024 Jun 19.
To meet evolving humidity monitoring needs, the development of flexible, high-performance humidity sensors is crucial. This study introduces an innovative flexible humidity sensor using a single-step laser scribing technique to fabricate a flexible in situ CoO nanoparticle-embedded laser-induced graphene (CoO-LIG) composite electrode. Compared to conventional LIG electrodes, the CoO-LIG electrode exhibits improved conductivity and hydrophilicity, enhancing charge transfer and water molecule affinity. The unique two-dimensional structure and exceptional water permeability of graphene oxide (GO) combine with the rapid water response and high specific surface area of carboxylated multiwalled carbon nanotubes (MWCNTs), thereby assuming a crucial function in the modification and optimization of the performance of humidity sensors. Through the application of a homogenously blended aqueous solution comprising GO and MWCNTs in precise proportions onto the CoO-LIG composite electrode, an excellent humidity-responsive layer is established, culminating in the realization of a cutting-edge GO-MWCNTs@CoO-LIG flexible humidity sensor. Noteworthy attributes of this sensor include a heightened sensitivity [959.1% (Δ/)], rapid response and recovery times (within 5 and 26 s, respectively), and a noteworthy linearity ( = 0.994) across a relative humidity range of 14 to 95%. The findings presented herein offer valuable insights and a practical blueprint for the design and production of flexible humidity sensors.
为满足不断发展的湿度监测需求，开发柔性、高性能湿度传感器至关重要。本研究介绍了一种创新的柔性湿度传感器，该传感器采用单步激光划刻技术制备柔性原位嵌入CoO纳米颗粒的激光诱导石墨烯（CoO-LIG）复合电极。与传统的LIG电极相比，CoO-LIG电极具有更高的导电性和亲水性，增强了电荷转移和水分子亲和力。氧化石墨烯（GO）独特的二维结构和优异的水渗透性与羧基化多壁碳纳米管（MWCNTs）的快速水响应和高比表面积相结合，从而在湿度传感器性能的改性和优化中发挥关键作用。通过将按精确比例均匀混合的GO和MWCNTs水溶液施加到CoO-LIG复合电极上，建立了优异的湿度响应层，最终实现了一种前沿的GO-MWCNTs@CoO-LIG柔性湿度传感器。该传感器的显著特性包括高灵敏度[959.1%（Δ/）]、快速响应和恢复时间（分别在5秒和26秒内），以及在14%至95%的相对湿度范围内具有显著的线性度（=0.994）。本文提出的研究结果为柔性湿度传感器的设计和生产提供了有价值的见解和实用蓝图。
