This work presents the noncontact immobilization of Ti₃C₂T_x MXene on a planar microwave resonator sensor via a polyimide film to enhance the gas detection sensitivity, enabling the characterization of the part per million-level of acetone gas. Sandwiching a polyimide (PI) film confined an intense electromagnetic field between the resonator’s interdigital capacitor structure and the MXene layer, maintaining a significant interaction between the acetone gas molecules and the resonator’s EM field via the MXene layer. Therefore, contactless immobilization of the MXene layer enhanced the acetone gas detection sensitivity by 110% compared to the resonator gas sensor with MXene deposited directly on the resonator surface. As a proof of concept, two sensor prototypes were implemented using resonators with layers of PI film and MXene and resonators with MXene only and were applied to detect a wide range of acetone gas concentrations. Immobilizing the layers of PI film and MXene on the microwave resonator achieved a linear correlation between the resonant frequency and acetone gas concentration with high sensitivity (17.85 kHz/ppm, a fast response time (60 s), and recovery time (85 s).

这项工作展示了通过聚酰亚胺薄膜将 Ti ₃ C ₂ T _x MXene非接触式固定在平面微波谐振器传感器上，以提高气体检测灵敏度，从而能够表征百万分之一级的丙酮气体。将聚酰亚胺 (PI) 薄膜夹在中间，限制强电磁场在谐振器的叉指电容器结构和 MXene 层之间，通过 MXene 层在丙酮气体分子和谐振器的 EM 场之间保持显着的相互作用。因此，与将 MXene 直接沉积在谐振器表面上的谐振器气体传感器相比，MXene 层的非接触固定将丙酮气体检测灵敏度提高了 110%。作为概念证明，使用带有 PI 薄膜和 MXene 层的谐振器以及仅带有 MXene 的谐振器实现了两个传感器原型，并用于检测各种丙酮气体浓度。将 PI 薄膜和 MXene 层固定在微波谐振器上，实现了谐振频率与丙酮气体浓度之间的线性相关，具有高灵敏度（17.85 kHz/ppm，快速响应时间（60 秒）和恢复时间（85 秒））。