Trimethylamine sensing properties of sensors based on MoO₃ microrods

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• 作者：Xiangfeng Chu ; Shiming Liang ; Wenqi Sun ; Wangbing Zhang ; Tongyun Chen ; Qianfeng Zhang
• 关键词：MoO₃ ; Trimethylamine ; Gas sensor ; Microrod
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2010
• 出版时间：15 July 2010
• 年：2010
• 卷：148
• 期：2
• 页码：399-403
• 全文大小：330 K

文摘

MoO₃ microrods have been prepared via the probe sonication route using ammonium molybdate, urea and sodium dodecyl sulphate as raw materials. The h-MoO₃ phase is transformed to α-MoO₃ at 400 °C. The phase composition and morphology of particles in these materials are characterized through X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The XRD analysis results reveal that h-MoO₃ can be obtained at 70 °C. TEM images manifest that the average particle sizes are less influenced by the calcination temperature, the particle morphology are rod whose diameters are in the range of 500–750 nm and lengths are about 1–5 μm. Furthermore, the influence of the heating duration and the heating temperature on the gas-sensing properties of the sensors based on MoO₃ microrods is also investigated in this work. The responses to several organic gases, such as (CH₃)₃N and (CH₃)₂CO are studied. It is found that the sensor based on MoO₃ nano-material (200 °C, 4 h) exhibits best performance in all sensors investigated in this work. The responses of the sensor based on MoO₃ (200 °C, 4 h) to 1000 and 0.01 ppm (CH₃)₃N at 300 °C are as high as 2533 and 1.5, respectively; and the response time and recovery time for 1 ppm trimethylamine are 8 and 9 s, respectively.