VOC s detection using resistive gas nanosensor based on MIL-101(Cr) as a metal organic framework

Metal-organic frameworks (MOFs) with interconnected porosity, unique physical properties and increased surface area have been used widely in various applications including catalysis, filtration, gas separation and sensing. The resistive sensors are more common types of gas sensors which can be applied in different areas that need to have semiconductor sensing materials. Most of the MOFs types are dielectric materials which can be chemically modified to enhance their conductivity. Modified MOFs may be used as electronic components in gas resistive chemical sensors. In the present study, to our best knowledge, for the first time MIL-101(Cr)/CNT nanocomposite was used for detection of VOCs including methanol, ethanol, formaldehyde, isopropanol, acetone, tetrahydrofuran, acetonitrile, dichloromethane and n-hexane at room temperature. Afterward, the nanocomposite was characterized by using X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), Energy Dispersive Analysis of X-rays (EDAX) and specific surface area analysis (BET). Also, the sensor performance evaluated by sensitivity, selectivity, response and recovery time, repeatability, limits of detection, and stability studies. The results show good sensing behavior for this proposed new sensor.