To avoid false response caused by increase of environmental humidity is important for hydrophilic polydopamine (PDA) based QCM formaldehyde sensor. In order to achieve this purpose, superhydrophobic polymerized n-octadecylsiloxane (PODS) nanostructure is used to cover the surface of PDA film to prevent false response from happening. Compared with pristine PDA based QCM sensor, the sensor based on PODS-PDA composite sensing material shows satisfactory performance on avoiding false response and long-term stable formaldehyde sensing properties. This novel strategy offers a new method to reduce probability of false response resulted from humidity change.

对于基于亲水性聚多巴胺（PDA）的QCM甲醛传感器，避免因环境湿度增加而引起的错误响应非常重要。为了实现该目的，使用超疏水聚合的正十八烷基硅氧烷（PODS）纳米结构覆盖PDA膜的表面，以防止发生错误响应。与原始PDA基QCM传感器相比，基于PODS-PDA复合传感材料的传感器在避免错误响应和长期稳定的甲醛传感性能方面表现出令人满意的性能。这种新颖的策略提供了一种新的方法来减少由湿度变化引起的错误响应的可能性。