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利用还原氧化石墨烯和侧边抛磨光纤制作了一种新型的基于石墨烯的光纤甲苯传感器。传感器可在室温环境下工作,响应及恢复时间均约为256 s,对甲苯浓度(体积分数)的最低检出限小于等于7.9×10-5。传感器在对低浓度甲苯的探测中具有良好的线性及可恢复性。基于传感机理理论模型的估算表明,石墨烯的掺杂水平对传感器的灵敏度具有重要影响,石墨烯化学势的适当提高可以显著提升传感器的灵敏度。滞留水分子对传感所带来的影响也可通过对湿度的监测和控制加以评估及利用。传感器在实现低功耗、低制作成本、较高的灵敏度、快速响应及可有效恢复的甲苯探测中具有很大潜力。
A novel graphene-based fiber-optic toluene sensor was fabricated by using reduced graphene oxide and side-polished fiber. The sensor can work at room temperature, the response and recovery time is about 256 s, and the detection limit of toluene concentration (volume fraction) is less than or equal to 7.9 × 10-5. The sensor has good linearity and recoverability in the detection of low concentration of toluene. Estimation based on the theoretical model of sensing mechanism shows that the doping level of graphene has an important influence on the sensitivity of the sensor. Appropriately increasing the chemical potential of graphene can significantly improve the sensitivity of the sensor. The effect of trapped water molecules on sensing can also be assessed and utilized by monitoring and controlling humidity. Sensors have great potential for achieving low power consumption, low production costs, high sensitivity, fast response, and efficient detection of toluene.