使用装饰有金属有机框架的局域表面等离子体共振光纤传感器测量挥发性有机化合物蒸汽
Volatile Organic Compound Vapour Measurements Using a Localised Surface Plasmon Resonance Optical Fibre Sensor Decorated with a Metal-Organic Framework.
作者信息
He Chenyang, Liu Liangliang, Korposh Sergiy, Correia Ricardo, Morgan Stephen P
机构信息
Optics and Photonics Group, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK.
出版信息
Sensors (Basel). 2021 Feb 18;21(4):1420. doi: 10.3390/s21041420.
A tip-based fibreoptic localised surface plasmon resonance (LSPR) sensor is reported for the sensing of volatile organic compounds (VOCs). The sensor is developed by coating the tip of a multi-mode optical fibre with gold nanoparticles (size: 40 nm) via a chemisorption process and further functionalisation with the HKUST-1 metal-organic framework (MOF) via a layer-by-layer process. Sensors coated with different cycles of MOFs (40, 80 and 120) corresponding to different crystallisation processes are reported. There is no measurable response to all tested volatile organic compounds (acetone, ethanol and methanol) in the sensor with 40 coating cycles. However, sensors with 80 and 120 coating cycles show a significant redshift of resonance wavelength (up to ~9 nm) to all tested volatile organic compounds as a result of an increase in the local refractive index induced by VOC capture into the HKUST-1 thin film. Sensors gradually saturate as VOC concentration increases (up to 3.41%, 4.30% and 6.18% in acetone, ethanol and methanol measurement, respectively) and show a fully reversible response when the concentration decreases. The sensor with the thickest film exhibits slightly higher sensitivity than the sensor with a thinner film. The sensitivity of the 120-cycle-coated MOF sensor is 13.7 nm/% (R = 0.951) with a limit of detection (LoD) of 0.005% in the measurement of acetone, 15.5 nm/% (R = 0.996) with an LoD of 0.003% in the measurement of ethanol and 6.7 nm/% (R = 0.998) with an LoD of 0.011% in the measurement of methanol. The response and recovery times were calculated as 9.35 and 3.85 min for acetone; 5.35 and 2.12 min for ethanol; and 2.39 and 1.44 min for methanol. The humidity and temperature crosstalk of 120-cycle-coated MOF was measured as 0.5 ± 0.2 nm and 0.5 ± 0.1 nm in the humidity range of 50-75% relative humidity (RH) and temperature range of 20-25 °C, respectively.
报道了一种基于尖端的光纤局域表面等离子体共振（LSPR）传感器，用于检测挥发性有机化合物（VOCs）。该传感器是通过化学吸附过程在多模光纤尖端涂覆金纳米颗粒（尺寸：40 nm），并通过逐层工艺用HKUST-1金属有机框架（MOF）进一步功能化而开发的。报道了涂覆不同循环次数（40、80和120次）MOF的传感器，这些循环次数对应不同的结晶过程。在涂覆40次的传感器中，对所有测试的挥发性有机化合物（丙酮、乙醇和甲醇）均无可测量的响应。然而，涂覆80次和120次的传感器对所有测试的挥发性有机化合物均显示出共振波长的显著红移（高达约9 nm），这是由于VOC捕获到HKUST-1薄膜中导致局部折射率增加所致。随着VOC浓度增加（丙酮、乙醇和甲醇测量中分别高达3.41%、4.30%和6.18%），传感器逐渐饱和，当浓度降低时显示出完全可逆的响应。膜最厚的传感器比膜较薄的传感器表现出略高的灵敏度。在丙酮测量中，涂覆120次MOF的传感器灵敏度为13.7 nm/%（R = 0.951），检测限（LoD）为0.005%；在乙醇测量中，灵敏度为15.5 nm/%（R = 0.996），LoD为0.003%；在甲醇测量中，灵敏度为6.7 nm/%（R = 0.998），LoD为0.011%。丙酮的响应和恢复时间分别计算为9.35和3.85分钟；乙醇为5.35和2.12分钟；甲醇为2.39和1.44分钟。在相对湿度（RH）为50 - 75%和温度范围为20 - 25°C的条件下，涂覆120次MOF的湿度和温度串扰分别测量为0.5±0.2 nm和0.5±0.1 nm。
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