Dual-Motor Oxygen-Deficiency-Engineering Al-Doped W 18 O 49– x Circular Nanorod Arrays for Parts per Billion-Level Acetone Detection

作者：Jinwu Hu, Jin Lin, Huirong Kou, Huijun Li, Jingcheng Xu, Qingmin Hu, Guisheng Li, Ding Wang · 发表于：Nano Letters · 年份：2025 · DOI：10.1021/acs.nanolett.5c03597 · 被引用次数：6 · 研究领域：Gas Sensing Nanomaterials and Sensors、Conducting polymers and applications、Analytical Chemistry and Sensors

Developing low-temperature gas sensors for parts per billion-level acetone detection in breath analysis remains challenging for non-invasive diabetes monitoring. We implement dual-defect engineering via one-pot synthesis of Al-doped W 18 O 49– x nanorod arrays, establishing a W–O v –Al catalytic mechanism. Al 3+ doping induces lattice strain to boost oxygen vacancy density by 31.74% while transforming passive O v sites into active centers that enhance α-chemisorbed oxygen capacity and accelerate O 2 dissociation into reactive O – species. This synergy strengthens acetone adsorption (density functional theory-confirmed adsorption energy of −1.607 eV) and directs selective oxidation to acetic/formic acid. Consequently, the Al–W 18 O 49– x sensor demonstrates exceptional performance, including a maximum response of 65–50 ppm of acetone at 200 °C, an ultralow limit of detection (LOD) of 10 ppb, and remarkable long-term stability and durability, highlighting its potential for clinical diabetes diagnosis. Integrated with machine learning algorithms, it successfully discriminates healthy and simulated diabetic breath, enabling non-invasive clinical screening.