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CHEMICAL ENGINEERING JOURNAL · 2026 · IF 12.5

Flower-like FeWO4/CeO2 heterojunction for enhanced humidity sensors working at room temperature: Mechanism study and potential application for non-contact healthcare monitoring

Shixiang Chen,Xiaobei Xu,Zhihua Zhao

Flower-like FeWO 4 /CeO 2 heterojunction was fabricated for humidity sensor. • The response of the sensor was 327 at room temperature. • The sensors show excellent reproducibility, stability and wide humidity detection limits. • The sensors can monitor human respiratory status and detect non-contact finger proximity. As non-contact sensing, breath detection, and environmental humidity monitoring technologies advance, the demand for high-performance humidity sensors is becoming increasingly apparent. FeWO 4 is a reliable humidity-sensing material owing to its unique crystal structure and outstanding electrochemical properties. However, achieving fast responsiveness and high sensitivity to dynamic changes in humidity is still challenging. Herein, a series of flower-like FeWO 4 /CeO 2 heterojunction composites with various ratios were synthesized via a solvothermal method. The crystal phase, micromorphology, defect states and specific surface areas of the composites were systematically characterized by XRD Rietveld refinement, XPS, EPR, SEM, TEM, FTIR, Raman and BET analysis. When employed as resistive humidity sensing materials, the optimized FC-10 sample with a nominal CeO 2 loading of 10 wt% exhibits a response value (R 11% /R 95% ) of 327 at 95% RH, which is approximately 20 times that of pure FeWO 4 (16.19), and a fast response time of 9 s. Compared with most previously reported flower-like oxide humidity sensors, the FC-10 sensor achieves a synchronous enhancement in response magnitude and response speed. The sensor can resolve a steady-state humidity change of 1% RH in the medium humidity range of 45%–55% RH, and also features good repeatability and long-term stability. The DFT calculations reveal that the FeWO 4 /CeO 2 heterostructure possesses stronger thermodynamic binding affinity to water molecules than the two pure phases, and the interfacial charge redistribution promotes carrier separation, which accounts for the enhanced sensing response. Furthermore, the sensor shows application potential in respiratory humidity signal detection and non-contact proximity sensing based on water vapor perception. Download: Download high-res image (156KB) Download: Download full-size image

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ACS Sensors · 2025 · IF 9.1

Flower-like FeWO4/f-MWCNTs Sphere for Triethylamine Gas Sensors Operating at Room Temperature: Sensing Performance, Mechanism Study, and Application to Detection of Fish Freshness

Zhihua Zhao,Shuhan Chen,Huiqin Li,Lan Wu,Zhigang Shao,Qilin Zou,Zhikun Wang

Triethylamine (TEA) is a colorless organic liquid known for its high volatility that poses significant irritation to the human respiratory tract; meanwhile, TEA can be released from decaying fish, which can be monitored by a gas sensor. However, conventional TEA gas sensors typically require high operating temperatures, leading to a substantial energy consumption. To address food safety concerns and promote environmental sustainability, the advancement of a TEA sensor that works at room temperature is urgently needed. In our work, an FeWO4/f-MWCNTs-3 chemoresistive gas sensor was fabricated by the hydrothermal method, integrating FeWO4 with multiwalled carbon nanotubes treated with mixed acids (f-MWCNTs). The sensor demonstrates superior performance, owing to its elevated specific surface area, total pore volume, and synergistic effect of p–p heterojunctions. FeWO4/f-MWCNTs-3 demonstrates excellent reproducibility, moisture resistance, stability, a minimal detection threshold of 1 ppm, and relatively rapid response/recovery times of 15/63 s. It attains a 113% response at 100 ppm of TEA at 25 °C. The applicability of FeWO4/f-MWCNTs-3 for assessing fish freshness via TEA concentration analysis from pomfret fish stored at ambient temperature for 14 days was validated, indicating its significance in fish freshness detection methodologies. Additionally, the gas-sensing mechanism of this sensor was further explored using density functional theory (DFT).

CAS / MDL: 10102-40-6 107-21-1 121-44-8 127-08-2 308068-56-6 71-23-8 71-36-3 68-12-2 34819-78-8

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Flower-like FeWO4/CeO2 heterojunction for enhanced humidity sensors working at room temperature: Mechanism study and potential application for non-contact healthcare monitoring

Flower-like FeWO4/f-MWCNTs Sphere for Triethylamine Gas Sensors Operating at Room Temperature: Sensing Performance, Mechanism Study, and Application to Detection of Fish Freshness