Kim Jong Hun, Choi Yeong Uk, Jung Jong Hoon, Kim Jae-Hun
Department of Physics, Inha University, Incheon 22212, Republic of Korea.
Department of Materials Science and Engineering, Inha University, Incheon 22212, Republic of Korea.
Sensors (Basel). 2024 Mar 17;24(6):1927. doi: 10.3390/s24061927.
In this study, a novel flexible ethanol gas sensor was created by the deposition of a CoFeO (CFO) thin film on a thin mica substrate using the pulsed laser deposition technique. Transition electron microscopy (TEM) investigations clearly demonstrated the successful growth of CFO on the mica, where a well-defined interface was observed. Ethanol gas-sensing studies showed optimal performance at 200 °C, with the highest response of 19.2 to 100 ppm ethanol. Operating the sensor in self-heating mode under 7 V applied voltage, which corresponds to a temperature of approximately 200 °C, produced a maximal response of 19.2 to 100 ppm ethanol. This aligned with the highest responses observed during testing at 200 °C, confirming the sensor's accuracy and sensitivity to ethanol under self-heating conditions. In addition, the sensor exhibited good selectivity to ethanol and excellent flexibility, maintaining its high performance after bending and tilting up to 5000 times. As this is the first report on flexible self-heated CFO gas sensors, we believe that this research holds great promise for the future development of high-quality sensors based on this approach.
在本研究中，采用脉冲激光沉积技术在薄云母衬底上沉积CoFeO（CFO）薄膜，制备了一种新型柔性乙醇气体传感器。透射电子显微镜（TEM）研究清楚地表明CFO在云母上成功生长，观察到了清晰的界面。乙醇气敏研究表明，该传感器在200℃时性能最佳，对100 ppm乙醇的最高响应为19.2。在7 V外加电压下以自热模式操作传感器，对应温度约为200℃，对100 ppm乙醇的最大响应为19.2。这与在200℃测试期间观察到的最高响应一致，证实了该传感器在自热条件下对乙醇的准确性和灵敏度。此外，该传感器对乙醇表现出良好的选择性和出色的柔韧性，在弯曲和倾斜多达5000次后仍保持其高性能。由于这是关于柔性自热CFO气体传感器的首次报道，我们相信这项研究对于基于这种方法的高质量传感器的未来发展具有巨大的潜力。
