P2EM.10 - Ferrochromic WO3 Nanoparticles for Metabolic Sensors
- Event
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria - Chapter
- P-2 - Emerging Sensor Technologies
- Author(s)
- O. Abe, G. Jodhan, P. Gouma - The Ohio State University, Columbus, Ohio (USA)
- Pages
- 765 - 766
- DOI
- 10.5162/IMCS2018/P2EM.10
- ISBN
- 978-3-9816876-9-9
- Price
- free
Abstract
Flame spray pyrolysis (FSP) synthesized ε-WO3 nanoparticles has previously been shown by our group to be a selective chemi-resistive sensor for acetone. The proposed mechanism for the sensitivity and selectivity of the sensor has been the interaction between the ferroelectric dipoles of the ε-WO3 crystal and the polar acetone molecules. The study of ferroelectric properties of nanoparticles is not a trivial task. The transformative potential of ε-WO3 as a ketosis sensor for diabetics and a metabolic rate sensor for diet and exercise monitoring among others, makes it imperative to fully characterize the material so as to achieve optimized properties. Here we report on a visible and reversible color switching phenomenon that is also driven by the ferroelectric structure of the ε-WO3. Previous Raman studies shown by our group suggests that material is not undergoing intercalaton and changes color without the need for an electrolyte. Furthermore, we have shown that this coloration appears on glass, alumina, and paper substrates. Thus, it is argued that the FSP-processed ε-WO3 exhibits ferroelectricity and that the reversible coloration is not an electrochromic effect but a “ferrochromic” effect; i.e. coloration driven by ferroelectricity.