Open AccessDesign of MoS2/graphene heterostructure thin film sensors for high performance NO2 gas sensor applications
Author(s) -
R. Sakthivel,
Angelina Geetha,
B. Anandh,
V. Jagadeesan,
Anandha Ganesh,
J. Dineshkumar
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2070/1/012131
Subject(s) - graphene , materials science , raman spectroscopy , thin film , heterojunction , nanotechnology , sensitivity (control systems) , layer (electronics) , optoelectronics , response time , spray pyrolysis , characterization (materials science) , humidity , electronic engineering , computer science , optics , physics , computer graphics (images) , engineering , thermodynamics
In this paper, we fabricate a large-area chemiresitive type MoS 2 /graphene films sensor is grown by spray pyrolysis technique. The prepared sensor films were characterization by XRD, SEM, TEM Raman and BET analysis. The synergistic effect between MoS 2 and graphene through the CVD method produces such a hierarchical layer-by-layer assembly of the thin film structure. MoS 2 /graphene hybrid films not only show enhanced NO 2 sensitivity compared to NO 2 sensitivity alone. Graphene or MoS 2 films, but they also exhibit characteristics of rapid response and strong reproducibility. Selectiveness and stability findings demonstrate the outstanding sensing properties of the MoS 2 thin film sensor. The MoS 2 /G showed higher sensitivity (81%) towards NO 2 gas at the concentration of 1000 ppm followed by graphene (22 %) and MoS 2 (45 %) based sensors in sequence. The MoS 2 /G sensor also exhibits fast response (12 s) and recovery time (17 s) than other sensor samples. The concept of operation and sensing mechanism behind their impressive results has also been studied in depth. The effect of humidity on the performance of gas sensing was also discussed in the point of practical device applications.