Abstract

In this work, WO₃ nanosheets were synthesised and decorated with different percentages of N-GO nanocomposites to study gas sensing assets. The X-ray diffraction (XRD) and Raman spectra showed fine crystal quality. Scanning electron microscope (SEM) and transmission electron microscopy (TEM) illustrated nanosheets morphology for WO3 and confirmed its decoration. The variation of the sensor electrical resistance was studied at various gas concentrations in the range of temperature intervals. The optimal operational temperature was 200 °C. The optimum response signal and recovery time for WO₃–N-GO 6% at 200 ppm concentration were 90 s and 205 s, respectively. The selectivity of the WO₃–N-GO samples was 53%, 46% and 60% for WO₃–N-GO 3%, WO₃–N-GO 6% and WO₃–N-GO 9%, respectively at 200 °C. The highest response was found for WO₃–N-GO 9% to NO₂ (58%) and WO₃–N-GO 6% to CO (28%) at 200 °C. Therefore, by selecting the optimum percentage of N-GO nanocomposites, the sensors can be fabricated with the highest response to NO₂ or CO.

摘要

在这项工作中，WO ₃纳米片被合成并用不同百分比的 N-GO 纳米复合材料装饰，以研究气敏资产。X 射线衍射 (XRD) 和拉曼光谱显示出良好的晶体质量。扫描电子显微镜 (SEM) 和透射电子显微镜 (TEM) 显示了 WO3 的纳米片形貌并证实了其装饰。在温度间隔范围内的各种气体浓度下研究了传感器电阻的变化。最佳操作温度为 200 °C。WO ₃ –N-GO 6% 在 200 ppm 浓度下的最佳响应信号和恢复时间分别为 90 s 和 205 s。在WO的选择性₃ -N-GO样品是53％，46％和60％WO ₃–N-GO 3%、WO ₃ –N-GO 6% 和 WO ₃ –N-GO 9%，分别为 200 °C。在 200 °C 时，WO ₃ –N-GO 9% 对 NO ₂ (58%) 和 WO ₃ –N-GO 6% 对 CO (28%) 的响应最高。因此，通过选择 N-GO 纳米复合材料的最佳百分比，可以制造出对 NO ₂或 CO具有最高响应的传感器。