PODS-covered PDA film based formaldehyde sensor for avoiding humidity false response

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.