Solvent-dependent electrospinning performance of nanofiber-based colorimetric CO gas sensors

초록

This study aims to develop and evaluate a colorimetric sensor based on dichloromethane (DCM), a ruthenium complex, and polycaprolactone for carbon-monoxide detection. The sensor was designed based on a unique mechanism in which the benzothiadiazole ring reacts chemically with carbon monoxide to induce a color change. When DCM was used as the solvent, the sensor exhibited a ΔE of approximately 14 at 200 ppm CO, indicating high response and effective colorimetric response. Stability tests under various temperature and relative humidity conditions revealed its high resistance to humidity changes, although its performance degraded at temperatures above 60°C. The sensor exhibited excellent selectivity for carbon monoxide compared with other gases commonly generated during combustion processes and demonstrated stable performance after long-term stability. Energy Dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy analyses confirmed that DCM did not impair the chemical properties of the ruthenium complex while enabling the formation of nanofibers. This study proposes an efficient and stable colorimetric sensor for carbon monoxide detection and highlights its potential applications in environmental monitoring and industrial use. © 2025 Elsevier B.V.

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