Journal
MATERIALS TODAY COMMUNICATIONS
Volume 35, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mtcomm.2023.106106
Keywords
MoSe 2; rGO; Dimethylformamide (DMF); Chemiresistor; Hydrothermal synthesis
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In this study, a composite of MoSe2 and reduced graphene oxide (rGO) was successfully synthesized and used as a gas sensing platform for the detection of dimethylformamide (DMF) at room temperature. The structural analysis revealed the formation of MoSe2/rGO composite with the presence of MoO3 due to partial oxidation of MoSe2. Raman and XPS spectra confirmed the presence of 1T-MoSe2. The sensor showed sensitive and selective detection of DMF with a detection limit of 2 ppm and response (recovery) time of 130 s (50 s) and a relative response of 3.6%.
Two dimensional semiconductors such as MoSe2 with large specific surface area, bandgap in visible region and high carrier mobilities have attracted a greater attention as a sensing platform. A composite of MoSe2 and reduced graphene oxide (rGO) has been successfully synthesized using a facile hydrothermal method and used as a gas sensing platform for the room-temperature detection of dimethylformamide (DMF). Structural analysis has revealed the formation of MoSe2/rGO composite along with the presence of MoO3 due to partial oxidation of MoSe2 into MoO3. In addition, the presence of J2 mode (150.6 cm-1) in Raman spectra and 3d doublet with lower spin-orbit splitting in XPS spectra indicated the presence of 1T-MoSe2 in addition to main 2H-MoSe2. Sensor displayed a sensitive and selective detection of DMF down to 2 ppm with response (recovery) time of 130 s (50 s) and a relative response of 3.6 %. Present work highlights the role of optimum weight ratio in determining the overall sensing performance of the sensing devices. The advantages of repeatability, selectivity and excellent stability, provide a great possibility for the use of MoSe2/rGO-based composites in sensing.
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