UV Light Illumination Can Improve the Sensing Properties of LaFeO₃ to Acetone Vapor.

UV Light Illumination Can Improve the Sensing Properties of LaFeO₃ to Acetone Vapor.
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紫外光照明可以提高 LaFeO3 对丙酮蒸气的传感性能

DOI:
10.3390/s18071990
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发表时间:
2018-06-21
期刊:
Sensors (Basel, Switzerland)
影响因子:
--
通讯作者:
Hu J
Hu J
中科院分区:
其他
文献类型:
--
作者:
Zhang H;Qin H;Gao C;Zhou G;Chen Y;Hu J

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合成的 LaFeO3 纳米晶传感器粉末在 200 °C 下对传感丙酮蒸汽表现出积极的响应。对丙酮蒸气(0.5、1、2、5、10 ppm)的响应为 1.18、1.22、1.89、3.2 和 7.83。为了使传感器在较低的最佳温度下工作,进行了 365 nm 的紫外光照射。在365 nm紫外光照射下,传感器的响应比没有它时有更大的改善。对丙酮蒸气(0.5、1、2、5、10 ppm)的响应为 1.37、1.85、3.16、8.32 和 14.1。此外,最佳工作温度降低至 170 °C。随着相对湿度的增加,传感器的电阻和灵敏度降低。与其他气体相比,该传感器对丙酮表现出良好的选择性。由于可以检测超低浓度的丙酮蒸气,因此该传感器可用于对普通公众的糖尿病进行初步判断,因为糖尿病患者呼出的气体中含有高浓度的丙酮。该传感器表现出良好的稳定性,在紫外光照射下稳定性进一步增强。该传感器在365 nm紫外光照射下表现出更好的稳定性。无论是否在灯光照射下。当暴露于丙酮蒸气时,LaFeO3 材料显示出良好的传感器性能。
The synthesized LaFeO3 nanocrystalline sensor powders show positive response to sensing acetone vapor at 200 °C. The responses to acetone vapor (at 0.5, 1, 2, 5, 10 ppm) are 1.18, 1.22, 1.89, 3.2 and 7.83. To make the sensor operate at a lower optimum temperature, UV light illumination 365 nm is performed. Response of the sensor has a larger improvement under 365 nm UV light illumination than without it. The responses to acetone vapor (at 0.5, 1, 2, 5, 10 ppm) are 1.37, 1.85, 3.16, 8.32 and 14.1. Furthermore, the optimum operating temperature is reduced to 170 °C. As the relative humidity increases, the resistance and sensitivity of sensor are reduced. The sensor shows good selectivity toward acetone when compared with other gases. Since the detection of ultralow concentrations of acetone vapor is possible, the sensor can be used to preliminarily judge diabetes in the general public, as a high concentration of acetone is exhaled in breath of diabetic patients. The sensor shows a good stability, which is further enhanced under UV light illumination. The sensor shows better stability when under 365 nm UV light illumination. Whether under light illumination or not. The LaFeO3 material shows good performance as a sensor when exposed to acetone vapor.
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