Synthesis of nanostructured cubic phase SnO<sub>2</sub> thin film and its trace-level sensing of CO gas.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41345090.
- Also identified by DOI 10.1038/s41467-025-66760-2 and PMC identifier 12770612.
- Licence recorded as CC BY-NC-ND.
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Abstract
In this study, we report the fabrication of a cubic phase SnO<sub>2</sub>-based thin film gas sensor with excellent sensitivity and selectivity for carbon monoxide (CO) gas at room temperature, with a high response of 25606% achieved at 2 ppm CO gas concentration, and a detection limit down to 1 ppb. Cubic phase SnO<sub>2</sub> thin films are synthesized using a simple sol-gel process, followed by spin coating. Our synthesis technique allows for stabilizing the cubic phase of SnO<sub>2</sub>, confirmed through XRD and TEM studies, which is otherwise reported at high pressures and temperatures. Further, our DFT simulations show that the cubic phase of SnO<sub>2</sub> nanoparticles has a lower energy barrier for CO adsorption and desorption than the more common tetragonal phase. The low-voltage and ambient operating conditions of the sensor reported in this study make it highly practical for widespread use, thus offering a promising solution to the growing need for efficient and affordable gas sensing applications, including environmental monitoring, industrial safety, and medical diagnosis.