Journal
SENSORS
Volume 17, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/s17040675
Keywords
formaldehyde sensor; molecularly-imprinted polypyrrole; titanium dioxide nanotube array; humidity influence
Funding
- Multi-Sensor-Platform for Smart Building Management project [611887]
- Walloon Region of Belgium (Captindoor project) [1217697]
- FRIA
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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.
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