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

• Published in: Sensors and actuators. B, Chemical Vol. 255; pp. 2704 - 2712
• Main Authors: Wang, Luyu, Yu, Yongpeng, Xiang, Qun, Xu, Jin, Cheng, Zhixuan, Xu, Jiaqiang
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.02.2018; Elsevier Science Ltd
• Subjects: Avoiding humidity false response; Composite materials; Dopamine; Formaldehyde; Humidity; Hydrophobicity; Nanostructured materials; Polydopamine (PDA); QCM formaldehyde sensor; Sensors; Avoiding humidity false response; QCM formaldehyde sensor; Polydopamine (PDA)
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2017.09.082

•For the first time, PODS was combined with PDA as a composite material.•Designing PODS-covered PDA film based QCM formaldehyde sensor which can avoid humidity false response.•The sensor still maintain good response performance to detect formaldehyde.•The sensor displayed good stability, because PODS possesses self-cleaning ability. 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.