Optical MoS2 nanosheets gas sensor: experimental study

We propose a full optical method for gas sensing by few-layer MoS2 nanosheetsobtained by liquid-phase epitaxy (LPE). Our samples are fully characterized bytransmission electron microscopy (TEM), photoluminescent (PL) spectroscopy, and Xraydiffraction (XRD). Further characterization and evaluation of gas sensingapplication, had been done by implementing ultraviolet-visible spectroscopy (UV/Vis).For CO2 gas which acts as a donor to our sample (based on the evaluation method thatused in this work), we calculate the response in the visible region equal to 15% whilein longer wavelengths (near-infrared) the response clearly decreased. Our experimentsshow that using 2D transitional metal dichalcogenide (TMDC) materials for Gassensing applications may open a new horizon for using this kind of 2D material invarious types of optical sensors.