A Formaldehyde Sensor Based on Molecularly-Imprinted Polymer on a TiO2 Nanotube Array

作者：Tang Xiaohui^*; Raskin Jean Pierre; Lahem Driss; Krumpmann Arnaud; Decroly Andre; Debliquy Marc

来源：Sensors (Switzerland), 2017, 17(4): 675.

DOI：10.3390/s17040675

• formaldehyde sensor
• molecularly-imprinted polypyrrole
• titanium dioxide nanotube array
• humidity influence

Today, significant attention has been brought to the development of sensitive, specific, cheap, and reliable sensors for real-time monitoring. Molecular imprinting technology is a versatile and promising technology for practical applications in many areas, particularly chemical sensors. Here, we present a chemical sensor for detecting formaldehyde, a toxic common indoor pollutant gas. Polypyrrole-based molecularly-imprinted polymer (PPy-based MIP) is employed as the sensing recognition layer and synthesized on a titanium dioxide nanotube array (TiO2-NTA) for increasing its surface-to-volume ratio, thereby improving the sensor performance. Our sensor selectively detects formaldehyde in the parts per million (ppm) range at room temperature. It also shows a long-term stability and small fluctuation to humidity variations. These are attributed to the thin fishnet-like structure of the PPy-based MIP on the highly-ordered and vertically-aligned TiO2-NTA.

• 出版日期2017-4