In this paper, a capacitance humidity sensor which was fabricated by interdigital electrodes (IDEs) coated with Nafion/graphene oxide quantum dot (GOQD) thin film was reported. The sensor could convert concentration change of moisture into capacitance change of the IDEs. The morphological and nanostructure of the prepared Nafion/GOQD nanocomposite were characterized by the scanning electron microscopy (SEM), transmission electron microscopy (TEM), confirming that the Nafion/GOQD nanocomposite was successfully prepared. Test result showed that the proposed sensor exhibited higher sensitivity of 1025.99 pF/%RH (nearly double) and better linearity, compared with pure Nafion sensor, which could be ascribed to formation of a subordinate-assembly of 0D GOQD in the Nafion film. Furthermore, the humidity sensor exhibited excellent repeatability, fast response and recovery, and little hysteresis. It could offer a potential method to monitor the respiration. Lastly, the humidity sensing mechanism was studied through complex impedance spectra (CIS).

在本文中，报道了一种电容式湿度传感器，该传感器由涂有 Nafion/氧化石墨烯量子点 (GOQD) 薄膜的叉指电极 (IDE) 制成。该传感器可以将水分的浓度变化转化为 IDE 的电容变化。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）对制备的 Nafion/GOQD 纳米复合材料的形貌和纳米结构进行表征，证实 Nafion/GOQD 纳米复合材料制备成功。测试结果表明，与纯 Nafion 传感器相比，所提出的传感器具有 1025.99 pF/%RH 的更高灵敏度（接近两倍）和更好的线性度，这可以归因于在 Nafion 膜中形成了 0D GOQD 的从属组装。此外，湿度传感器表现出优异的重复性，响应和恢复快，滞后小。它可以提供一种监测呼吸的潜在方法。最后，通过复阻抗谱（CIS）研究了湿度传感机制。