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基于Ag掺杂g-C3N4/SnO2复合材料的低温高响应乙醇气体传感器
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Abstract:
开发高性能乙醇气体传感器在食品安全、医疗诊断与工业安全等领域具有重要意义。本文通过水热法成功制备了二维层状材料石墨氮化碳(g-C3N4)修饰的二氧化锡(SnO2)复合材料。得益于更小的纳米球状结构提供的丰富活性位点和形成的II型异质结有效促进了界面电荷转移与气体分子吸附过程。所得的5wt% g-C3N4/SnO2传感器在100 ppm乙醇气体检测中表现出高响应值(Ra/Rg = 40.7)，低检测限(0.3 ppm)，最佳工作温度为200℃以及优异的选择性。相比于SnO2传感器而言最佳工作温度降低了175℃且响应值翻倍。在将g-C3N4成功引入到SnO2的基础上，进一步引入粒径Ag纳米颗粒，所制备的3wt% Ag-5wt% g-C3N4/ SnO2复合材料展现出最优异的气敏性能，其最佳工作温度为150℃，在100 ppm乙醇气氛中的响应值提升至45.6，与5wt% g-C3N4/SnO2二元复合材料相比，其最佳工作温度进一步降低了50℃。本研究为开发低工作温度、高灵敏度与高选择性的乙醇气体传感器提供了一种有效的材料设计策略。
The development of high-performance ethanol gas sensors holds significant importance in many fields, such as industrial safety, medical diagnostics and food safety. This study successfully synthesized a composite material of tin dioxide (SnO2) modified with two-dimensional (2D) layered graphitic carbon nitride (g-C3N4) via a hydrothermal method. Benefiting from the abundant active sites of the smaller spherical structure and the formed Type II heterojunction, the resulting 5wt% g-C3N4/SnO2 sensor exhibits a high response value (Ra/Rg = 40.7), low detection limit (0.3 ppm), optimal operating temperature of 200？C, and excellent selectivity. Compared to the pure SnO2 sensor, its optimal operating temperature was reduced by 175？C and the response value was doubled. On the basis of successfully introducing g-C3N4 into SnO2, Ag nanoparticles were further incorporated. 3wt% Ag-5wt% g-C3N4/SnO2 composite exhibited the optimal gas-sensing performance, with an optimal operating temperature of 150？C and a response value of 45.6 toward 100 ppm ethanol. Compared with the 5wt% g-C3N4/SnO2 binary composite, the optimal operating temperature was reduced by 50？C. This study provides an effective material design strategy for developing ethanol gas sensors with low operating temperatures, high sensitivity, and high selectivity.
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