High performance ammonia gas sensor based on electrospinned Co3O4 nanofibers decorated with hydrothermally synthesized MoTe2 nanoparticles

This paper introduces a room temperature NH3 gas sensor with excellent performance based on cobalt trioxide and molybdenum telluride (Co3O4-MoTe2) nanocomposite. Co3O4 nanofiber was synthesized by electrospinning, and MoTe2 nano particle was synthesized by simple hydrothermal method. MoTe2, Co(3)O(4 )and Co3O4-MoTe2 film sensors were prepared on interdigital electrode substrate by drop coating method. X-ray photoelectron spectroscopy (XPS), dispersive spectrometer (EDS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) were used to observe the morphology, microstructure, and composition of the prepared nano-materials. The gas sensing performance of the pristine Co3O4-MoTe2 and Co3O4-MoTe2 composite film sensors were tested at room temperature. The results of experimental research show that the Co3O4-MoTe2 gas sensor has better sensing performance for ammonia than the pure sensor, such as high response (56.20%@1ppm), excellent selectivity, good stability, short response recovery time (7s/7s@1ppm) and low detection limit (26 ppb). The performance enhancement of the Co3O4-MoTe2 film sensor was mainly attributed to the p-n heterojunction formed between MoTe2 and CO3O4. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

This paper presents a room temperature NH3 gas sensor based on cobalt trioxide and molybdenum telluride nanocomposite, which exhibits excellent sensing performance for ammonia. The sensor shows high response, excellent selectivity, good stability, short response recovery time, and low detection limit.