Abstract：
Herein, SnO2QDs (<10 nm) with small size instead of conventional nanoparticles was employed to modify ZnFe2O4to synthesize porous and heterogeneous SnO2/ZnFe2O4(ZFSQ) composites for gas sensing. By an immersion process combined with calcination treatment, the resultant porous ZFSQ composites with different contents of SnO2QDs were obtained, and their sensing properties were investigated. Compared with bare ZnFe2O4and SnO2QDs, porous ZFSQ composites based-sensors showed much improved sensor response to acetone. For contrast, the sensor performance of ZFSQ composites was also compared with that of ZnFe2O4sphere modified by SnO2nanoparticles with different size. The porous ZFSQ composite with 5 wt% SnO2QDs (ZFSQ-5) showed a better acetone sensing response than that of other ZFSQ composites, and it exhibited a high response value of 110-100 ppm of acetone and a low detection limit of 0.3 ppm at 240 °C. In addition to the rich heterojunctions and porous structure, the size effect of SnO2QDs was other indispensable reasons for the improved sensor performance. Finally, the ZFSQ-5 composite sensor was attempted to be applied for acetone sensing in exhaled breath, suggesting its great potential in monitoring acetone.
摘要：
在这里，使用小尺寸的SnO2QD（<10nm）代替常规纳米颗粒来修饰ZnFe2O4，以合成多孔和异质的SnO2/ZnFe2O4（ZFSQ）复合材料，用于气敏。通过浸渍工艺与煅烧处理相结合，得到了不同SnO2量子点含量的多孔ZFSQ复合材料，并对其传感性能进行了研究。与裸ZnFe2O4和SnO2量子点相比，基于多孔ZFSQ复合材料的传感器对丙酮的响应得到了很大的改善。为了对比，还将ZFSQ复合材料的传感器性能与SnO2纳米颗粒修饰的ZnFe2O4球体的传感器性能进行了比较。具有5重量%SnO2量子点的多孔ZFSQ复合材料(ZFSQ-5)显示出比其他ZFSQ复合材料更好的丙酮传感响应,在240℃时，它表现出110至100ppm的丙酮的高响应值和0.3ppm的低检测限。除了丰富的异质结和多孔结构，具有大表面积和量子效应的SnO2量子点是提高传感器性能的另一个不可或缺的原因。最后,尝试将ZFSQ-5复合传感器应用于呼气中的丙酮传感，表明其在丙酮监测方面的巨大潜力。
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