Abstract
In this research, thin films of molybdenum trioxide were deposited on a glass substrate using Doctor Blade method. Ammonium Heptamolbudate tetrahydrate (NH4)6Mo7O24 powder is considered as a precursor to this study. Growth of the samples in three main directions of (020), (040) and (060) showed the formation of a layered structure and also the formation of α-phase of molybdenum oxide. In addition, scanning electron microscope imaging of the samples showed flat micro-capsule like structure. Furthermore, gas sensing properties of the fabricated structure were studied in expose to different concentrations of hydrogen gas. The highest and lowest sensitivities were reported about 16 and 91%, for 100 and 1000 ppm of hydrogen gas, respectively, which shows more sensitivity compare to previous studies. Moreover, the fabricated sensor exhibits good stability as well as repeatability for H2 gas detection.
Highlights
The human nose is recognized as a natural sensing device for the identification and separation of many gases
Deposition of MoO3 using blade technique To deposit a thin film of molybdenum oxide, 2g of the assynthesized powder is dissolved in 3.3 ml of a solution, including water and ethanol (1:1)
Other smaller peaks which are observed in the X-ray diffraction pattern (XRD) pattern, may be related to the presence of another type of molybdenum oxide
Summary
The human nose is recognized as a natural sensing device for the identification and separation of many gases. The construction and development of small-sized gas sensors have attracted a large part of the attention and efforts of scientists These sensors cover a wide range of industrial applications, from the identification of toxic gases to the detection of gas in the of production process [1]. Different structures such as Metal-Oxide Semiconductors, Catalyticoxides, and Structures involving the combination of these two structures, demonstrate different physical properties in exposure to different gases. The α-phase is used in a wide range of applications such as gas sensors, lithium-ion and biochemical batteries [6, 7] This material is synthesized by various methods including thermal evaporation [8], chemical vapor deposition [9], pyrolysis spray [10], and Sputtering [11]. The metal oxide is used to detect many gaseous molecules such as NO2, NO, H2, CO, ethanol, and acetone
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