BROWSE
Detail
Journal Article
Rapid Room-Temperature Ethanol Sensing in Bi2MoO6/rGO Heterostructures: Weak Adsorption-Driven Charge Modulation
- Authors
- Sagarika Panda, Savita Mehlawat, Kwanghyeon Jo, Neeraj Dhariwal, Chang Woo Myung, Mohd. Arif, Sung Bum Kang, Amit Sanger
- Citation
- Advanced Materials Technologies, Early Access
- ISSN
- 2365-709X
- Publisher
- John Wiley & Sons
- Language
- English
- Type
- Journal Article
- Abstract
- Chemiresistive sensors based on graphene derivatives and metal oxides continue to attract attention, yet achieving rapid and selective room‐temperature detection remains challenging due to sluggish surface kinetics and limited understanding of interfacial interactions. Here, we report a Bi 2 MoO 6 /reduced graphene oxide (rGO) heterostructure synthesized via hydrothermal synthesis and integrated onto interdigitated electrodes via blade coating. The device delivers outstanding ethanol sensing at 27°C, exhibiting a ∼16‐fold enhancement over pristine Bi 2 MoO 6 at 100 ppm, rapid 13/18 s response–recovery dynamics, a detection limit of 1.6 ppm, and excellent reproducibility and long‐term stability. A portable prototype module incorporating this sensor further demonstrates reliable real‐time ethanol monitoring, highlighting its practical applicability for environmental and breath analysis. To elucidate the origin of the unusual sensing behavior, we combine density functional theory (DFT) calculations with COMSOL‐based kinetic modeling. Despite its lowest adsorption energy among the tested analytes, ethanol induces the largest conduction‐band perturbation at the interface, whereas kinetic simulations reveal that weak adsorption accelerates adsorption–desorption turnover, thereby enabling frequent charge‐transfer events within the sensing timescale. This cooperative interplay between weak binding and dynamic interfacial modulation explains the exceptional selectivity and ultrafast response. These results establish Bi 2 MoO 6 /rGO as a mechanism‐guided platform for high‐performance room‐temperature gas sensing device development.
- KSP Keywords
- Adsorption energy, Breath analysis, Chemiresistive sensor, Detection limit, Device development, Hydrothermal Synthesis, Interdigitated electrodes(IDE), Metal-oxide(MOX), Reduced Graphene oxide, Room temperature, Temperature detection
This work is distributed under the term of Creative Commons License (CCL)
(CC BY)
(CC BY)
