As a new member of the MXene family, two dimensional (2D) niobium carbide MXene (Nb₂CT_x) holds a promising potential in gas detection due to the abundant surface terminated groups and large specific surface area. In this work, a selective NH₃ sensor based on polyaniline (PANI) nanofibers-supported Nb₂CT_x nanosheets (Nb₂CT_x/PANI) directly driven by a facile triboelectric nanogenerator (TENG) is proposed to provide a possible method for enhancing the NH₃-sensing response. In addition, the gas sensing properties have been optimized by regulating different spray volumes of Nb₂CT_x nanosheets. Test results demonstrate that the NH₃-sensing response and the response speed of the Nb₂CT_x/PANI-2 sensor have been evidently improved, indicating a good linear response toward a wide sensing range of 1–100 ppm NH₃ at room temperature (∼25℃) under 87.1 % relative humidity (RH). Moreover, the influence of high humidity on gas sensing response of the Nb₂CT_x/PANI-2 sensor has been efficiently reduced due to the occupied active sites for water adsorption caused by intermolecular hydrogen bonds between PANI and Nb₂CT_x. Finally, mechanism of the enhanced gas sensing properties has been further investigated, which should be mainly attributed to the gas sensing improvement effect of p-n junction. This work is expected to offer a useful reference for the development of high-performance Nb₂CT_x/polymer-based gas sensors.

作为MXene系列的新成员，二维（2D）碳化铌MXene（Nb ₂ CT _x）由于丰富的表面封端基团和大的比表面积而在气体检测中具有广阔的前景。在这项工作中，提出了一种基于聚苯胺（PANI）纳米纤维支撑的Nb ₂ CT _x纳米片（Nb ₂ CT _x / PANI）的选择性NH ₃传感器，该Nb ₂ CT _x纳米片由方便的摩擦电纳米发生器（TENG）直接驱动，以提供一种可能的增强方法NH ₃感应响应。此外，通过调节Nb ₂ CT _x的不同喷雾量，优化了气体感应性能纳米片。测试结果表明，NH ₃传感响应和Nb ₂ CT _x / PANI-2传感器的响应速度已有明显改善，表明在室温下对NH ₃为1–100 ppm的宽传感范围均具有良好的线性响应（〜25℃）在87.1％相对湿度（RH）下。此外，由于PANI和Nb ₂ CT _x之间的分子间氢键引起的水吸附活性位点被占用，高湿度对Nb ₂ CT _x / PANI-2传感器的气体传感响应的影响已得到有效降低。。最后，进一步研究了增强气敏性的机理，这主要归因于pn结对气敏性的改善作用。预期这项工作将为开发高性能Nb ₂ CT _x /聚合物型气体传感器提供有用的参考。