Mostafa Esmaeili - School of Engineering, Emerging Technologies, University of Tabriz, Tabriz, ۵۱۶۶۶۱۶۴۷۱, Iran
Gholamreza Kiani - School of Engineering, Emerging Technologies, University of Tabriz, Tabriz, ۵۱۶۶۶۱۶۴۷۱, Iran
Farhad Shahriari Nogorani - Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz, Iran
Saeed Boroomand - School of Engineering, Emerging Technologies, University of Tabriz, Tabriz, ۵۱۶۶۶۱۶۴۷۱, Iran

In this work, hierarchical WO۳ core-shell microspheres were synthesized via a facile template-free precipitation method. Gas sensing properties of the synthesized powder to acetone and some other volatile organic compounds were comparatively investigated with commercial WO۳ nanoparticles. The synthesized and commercial powders were characterized by X-ray diffraction, scanning electron microscopy, particle size distribution analysis, Brunauer–Emmett–Teller and Barrette-Joyner-Halenda techniques. Gas sensors were fabricated by deposition of powders between/on interdigitated electrodes via sedimentation approach. The results show that both sensors are sufficiently sensitive to detect ۱.۸ ppm of acetone; diabetes diagnosis threshold in human exhaled breath. Indeed, the hierarchical based one is highly sensitive and more selective to acetone.

Acetone, Core-shell microspheres, Diabetes, Gas sensor, Nanoparticles, WO۳