Abstract
In this paper, MoO3/MoSe2 nanocomposite was constructed by an improved hydrothermal and spin coating method for fabricating trimethylamine (TMA) gas sensor. The surface morphology and microstructure of the prepared materials were analyzed by XRD, XPS, SEM and TEM characterization methods. The microstructural characterization results demonstrated that the MoO3/MoSe2 nanocomposite had been successfully synthesized, in which the MoSe2 had a flower-shaped structure, and MoO3 had a rod-shaped structure. At the same time, the MoSe2 surface exhibited periodic honeycomb structure. The gas sensitivity experimental results showed that the proposed MoO3/MoSe2 sensor had excellent TMA sensing performance at room temperature, including high response capability, low detection limit (20 ppb), short response/recovery time (12 s/19 s), long-term stability, good repeatability and outstanding selectivity. The heterostructure of MoO3/MoSe2 had made outstanding contributions to the enhanced TMA gas sensing performance at room temperature.
Highlights
Trimethylamine (TMA) is a kind of colorless gas, whose vapor can form explosive mixture in air, and it will burn and explode violently when exposed to open flames or high heat, resulting in toxic smoke after thermal decomposition, which poses a great threat to human safety
The gas-sensitivity experimental results showed that the proposed MoO3/MoSe2 sensor had excellent TMA sensing performance at room temperature, including high response capability, low detection limit (20 ppb), short response/recovery time (12 s/19 s), long-term stability, good repeatability and outstanding selectivity
In order to solve the problem of high power consumption of MoO3 and improve the gas-sensing performances, room temperature TMA sensor based on heterostructure of MoSe2 nanoflower-modifed MoO3 was prepared by a simple hydrothermal method
Summary
Trimethylamine (TMA) is a kind of colorless gas, whose vapor can form explosive mixture in air, and it will burn and explode violently when exposed to open flames or high heat, resulting in toxic smoke after thermal decomposition, which poses a great threat to human safety. At a relatively low operating temperature (133oC), the response of α-MoO3 nanosheets gas sensor to 50 ppm TMA was 198 and the detection limit was 20 ppb [6]. TMA sensors based on MoO3 usually require higher operating temperature, resulting in high power consumption and potential safety hazards, so it is necessary to dope other semiconductors to improve the sensing performance. In order to solve the problem of high power consumption of MoO3 and improve the gas-sensing performances, room temperature TMA sensor based on heterostructure of MoSe2 nanoflower-modifed MoO3 was prepared by a simple hydrothermal method. The results showed that compared with single sensing material, the MoO3/MoSe2 composite-based sensor exhibited more excellent sensing properties to TMA in terms of selectivity, sensitivity, response/recovery time and minimum detection limit. The sensing mechanism was explained in detail based on the theory of oxygen adsorption and desorption on the semiconductor surface and n-n heterostructure theory
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