P2NG.22 - Synthesis and fabrication of ZnO-MoS2 nanocomposite thin film for hydrogen sensing application

17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria
P-2 - Nanomaterials for Gas Sensing
R. Khatri, N. Puri - Advanced Sensor Laboratory, Department of Applied Physics, Delhi Technological University, Delhi (India)
886 - 886


This work reports the synthesis of Zinc Oxide-Molybdenum disulfide (ZnO-MoS2) nanocomposite for hydrogen gas sensing. Pristine MoS2 is synthesized using simple and economical sol-gel hydrothermal method. Further it is doped with various concentrations of ZnO nanoparticles using in-situ chemical route. Xray diffraction (XRD) spectroscopy and transmission electron microscopy (TEM) are used to study the morphological and crystallographical characteristics of synthesized MoS2 and its nanocomposites respectively. Further, Fourier transform infrared (FTIR) spectroscopy and ultravioletvisible (UV-Vis) absorption spectroscopy have been employed to analyze the presence of bonds and optical properties respectively. Uniform thin films of MoS2 and ZnO-MoS2 nanocomposites are fabricated on interdigitated platinum electrode glass substrates using spin coating and dip coating method. The pristine MoS2 and its nanocomposite thin films on interdigitated glass electrodes are used as transducer for conductometric hydrogen gas sensing application at room temperature. It is observed that ZnO-MoS2 nanocomposites thin film demonstrate good hydrogen sensitivity as compared to the pristine MoS2 and their sensitivity is found to be increasing as the concentration of ZnO increases. Also, the nanocomposite thin film exhibits good selectivity for hydrogen (H2) on comparison with other gases. These results will help in construction of sensitive, selective and stable hydrogen gas sensing platform which can operate at room temperature.