Gas Sensing And Photoelectric Properties Of MoO₃ Nanomaterials

With the progress of social development,gas sensors and photodetectors have many applications in many fields.Because of their small size,low cost and wide range of working environment,they are deeply concerned by researchers and technicians.Molybdenum trioxide(MoO₃)has become a research hotspot in many fields,such as field effect transistor,capacitor,catalyst,photodetector,gas sensor,humidity sensor,electrochromic and photochromic devices,due to its unique layered structure,rich physical and chemical properties related to multivalent States and high chemical stability.In order to improve the performance of the sensor and diversify its functions,we use different methods to prepare samples,and carry out gas sensing and photoelectric tests on them.Long strip-shaped layered MoO₃ crystals with a length of about 2 cm were prepared by chemical vapor deposition.The prepared MoO₃ crystals were cut and ground respectively,and then the morphology,crystal structure,molecular vibration,defects and specific surface area of the processed samples were characterized.Subsequently,the processed samples were made into gas sensors and the gas sensing properties were tested.The results show that MoO₃ gas sensor has the highest sensitivity for ethanol gas,and the ethanol gas sensing characteristics of ground samples have the advantages of low working temperature,high sensitivity and wide response range,which have practicability in ethanol sensor.Meanwhile,the ethanol gas sensing mechanism and performance difference of the processed samples are discussed.Electrospinning and pulsed laser are used to prepare ordered polymer/molybdenum(PVP-Mo)core-shell nanowires,and then annealed in an annealing furnace to remove PVP to prepare?-MoO₃ nanotubes.?-MoO₃ is an effective material for electrochemical sensor devices.The results show that the material has good charge transfer ability,high current density,high light absorption and other characteristics.The ordered nanotubes prepared in this experiment,combined with gold electrodes,are fabricated into a planar molybdenum trioxide sensor.We found that it has a better response,which should benefit from its hollow ordered nanotube structure,which is gas diffusion and electron transport provides a favorable channel,and this structure also increases the specific surface area,which increases the exposure of lattice oxygen on the surface of the material.