Rahman Sheik Abdur, Khan Shenawar Ali, Rehman Muhammad Muqeet, Kim Woo-Young
Faculty of Applied Energy System, Major of Electronic Engineering, Jeju National University, Jeju 63243, Korea.
Nanomaterials (Basel). 2022 Mar 21;12(6):1026. doi: 10.3390/nano12061026.
Two-dimensional (2D) materials and their composites have gained significant importance as the functional layer of various environmental sensors and nanoelectronics owing to their unique properties. This work reports for the first time a highly sensitive, fast, and stable humidity sensor based on the bi-layered active sensing area composed of graphene flower (GF) and poly (vinyl alcohol) PVA thin films for multifunctional applications. The GF/PVA humidity sensor exhibited stable impedance response over 15 days, for a relative humidity (RH) range of (40-90% RH) under ambient operating conditions. The proposed bi-layered humidity sensor also exhibited an ultra-high capacitive sensitivity response of the 29 nF/%RH at 10 kHz and fast transient response of 2 s and 3.5 s, respectively. Furthermore, the reported sensor also showed a good response towards multi-functional applications such as non-contact skin humidity and mouth breathing detection.
二维（2D）材料及其复合材料因其独特的性能，作为各种环境传感器和纳米电子器件的功能层而变得极为重要。这项工作首次报道了一种基于由石墨烯花（GF）和聚乙烯醇（PVA）薄膜组成的双层有源传感区域的高灵敏度、快速且稳定的湿度传感器，用于多功能应用。在环境操作条件下，GF/PVA湿度传感器在15天内对相对湿度（RH）范围为（40 - 90%RH）表现出稳定的阻抗响应。所提出的双层湿度传感器在10 kHz时还表现出29 nF/%RH的超高电容灵敏度响应以及分别为2秒和3.5秒的快速瞬态响应。此外，所报道的传感器对诸如非接触式皮肤湿度和口腔呼吸检测等多功能应用也表现出良好的响应。
