P1NM.20 - Isoprene detection with Ti-doped ZnO nanoparticles
- Event
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria - Chapter
- P-1 - Nanomaterials
- Author(s)
- D. Klein Cerrejon, A. Güntner, N. Pineau, D. Chie, F. Krumeich, S. Pratsinis - Particle Technology Laboratory, ETH Zürich, Zurich (Switzerland)
- Pages
- 616 - 617
- DOI
- 10.5162/IMCS2018/P1NM.20
- ISBN
- 978-3-9816876-9-9
- Price
- free
Abstract
Exhaled isoprene could enable non-invasive real-time monitoring of cholesterol-lowering therapies. Here, we report an isoprene-selective sensor at high relative humidity (RH). It is made of nanostructured, chemo-resistive Ti-doped ZnO nanoparticles produced by flame spray pyrolysis (FSP) and directly deposited onto sensor substrates forming highly porous films. The constituent particles consist of stable Ti-doped ZnO solid solutions for Ti levels up to 10 mol%. Ti doping strongly enhance the isoprene sensitivity (>15 times higher than pure ZnO) and turn ZnO isoprene-selective, while also improving its thermal stability. In fact, at an optimal Ti content of 2.5 mol%, this sensor shows superior isoprene responses compared to acetone, NH3 and ethanol at 90% RH. Most notably, breath-relevant isoprene concentrations are detected accurately down to 5 ppb. As a result, an inexpensive isoprene detector has been developed that could be easily incorporated into a portable breath analyzer for noninvasive monitoring of metabolic disorders (e.g. cholesterol).