Two dimensional (2D) MXene decorated by the SnO₂ nanoparticles has been successfully synthesized by the hydrothermal method. The formed MXene/SnO₂ heterojunction based chemirestistive-type sensors exhibit an excellent sensitivity and selectivity to different concentrations of NH₃ from 0.5 to 100 ppm at room temperature. The enhanced sensing properties can be attributed to two major factors. On one hand, 2D MXene provides a matrix which has a unique, selective adsorption ability to ammonia and good conductivity that makes the room-temperature sensing of the heterojunction based sensor feasible. On the other hand, the difference in the Fermi level of the 2D MXene and SnO₂ drives the charge transfer at the interface of the heterojunctions enriching the electrons on the surface region of SnO₂ and consequently enhancing the sensitivity. Furthermore, a wireless sensor made from an inductor-capacitor (LC) antenna and the as-synthesized MXene/SnO₂ heterojunctions fabricated by the low-temperature-cofired ceramic technique (LTCC) was preliminary investigated. The wireless sensor shows a even faster response/recovery speeds (<30 s) and more stable response to different concentrations of ammonia when the response was expressed in the mode of resonant frequency indicating a promising practical application.

通过水热法成功地合成了由SnO ₂纳米粒子修饰的二维（2D）MXene 。所形成的基于MXene / SnO ₂异质结的化学弹性型传感器在室温下对0.5至100 ppm的不同NH ₃浓度具有出色的灵敏度和选择性。增强的感测特性可以归因于两个主要因素。一方面，二维MXene提供了一种对氨具有独特的选择性吸附能力和良好的导电性的基质，这使得基于异质结的传感器的室温感测变得可行。另一方面，二维MXene和SnO ₂的费米能级不同驱动异质结界面处的电荷转移，使SnO ₂表面区域上的电子富集，从而提高了灵敏度。此外，初步研究了由电感电容器（LC）天线和通过低温共烧陶瓷技术（LTCC）制成的合成MXene / SnO ₂异质结制成的无线传感器。当以共振频率模式表示响应时，无线传感器显示出更快的响应/恢复速度（<30 s）和对不同浓度氨气的更稳定响应，这表明它有希望的实际应用。