Heterostructured binary/ternary MoO3/Bi2MoO6 metal oxide-based acetone sensing devices relevant to non-invasive disease monitoring

Abstract

This study focuses on the fabrication and optimization of chemiresistive sensing devices relevant to non-invasive disease monitoring, specifically diabetes. Heterostructured MoO₃/Bi₂MoO₆ consistently outperforms MoO₃ and Bi₂MoO₆, displaying superior sensitivity towards acetone. The maximum sensor response of this heterostructured material is 460.387 at 1500 ppm of acetone concentration, whereas the sensor response was 1.431 at 1 ppm of acetone. The limit of detection (LOD) analysis underscores that the exceptional sensitivity, particularly at logarithmic concentration scales, was found to be 0.168 ppm for MoO₃/Bi₂MoO₆. Furthermore, the response of the materials to varying temperatures indicates that MoO₃/Bi₂MoO₆ maintains a consistently high sensor response, highlighting its adaptability to diverse environmental conditions. The study also assesses the selectivity of these materials towards various analytes, with MoO₃/Bi₂MoO₆ emerging as the most selective for acetone. The electrical structure and chemical characteristics of these materials in contact with acetone are investigated using density functional theory (DFT), yielding theoretical insights consistent with the experimental results. Thus, this research unveils the MoO₃/Bi₂MoO₆ exceptional sensor response and selectivity for acetone, promising significant advancements in chemiresistive non-invasive sensing for acetone detection for monitoring diabetes and other diseases to advancing healthcare horizons.