【作者】：Spinel-type oxides have attracted more and more attention due to their high thermodynamic stability, good catalytic characteristic and flexibly tunable features. Herein, we report the synthesis of yolk-shell ZnCr2O4 microspheres with superior xylene sensing properties by a one-step solvothermal approach. The gas sensing properties of the as-prepared ZnCr2O4 microspheres were investigated. The sensor based on yolk-shell ZnCr2O4 microspheres showed excellent selectivity to xylene having a high response value of 200.7-100 ppm xylene, which was almost 77 times than that of Cr2O3 microspheres at 225 degrees C. As for the detection limit, the response value of sensor to 0.5 ppm xylene was 1.2. In addition, after 22 days of measurement, it could still keep the response of nearly 200-100 ppm xylene, indicating good long-term stability. The excellent gas sensing performances of sensor to xylene can be ascribed to the yolk-shell architecture with a large specific surface area and the high surface adsorbed oxygen species concentration.
原文链接：
https://www.sciencedirect.com/science/article/pii/S0925400523006445
【题目】：Sn2+ doped NiO hollow nanofibers to improve triethylamine sensing characteristics through tuning oxygen defects
【关键词】：Metal oxide； Sn2+ doping NiO； Oxygen vacancy； Hollow structure； Gas sensor
【版面信息】：Sensors and Actuators B: Chemical 2023, 387, 133801.
摘要:
The triethylamine (TEA) sensors with high response and selective detection have been widely reported. However, sluggish kinetics of recovery process, high operating temperature, unsatisfied long-term stability and high detection limit still restrict their further application. In this work, NiO nanofibers with different contents of Sn2+are prepared via electrospinning method. Gas sensing investigation indicates that the sensor based on 6 at% Sn2+doped NiO nanofibers with an elevated baseline resistance exhibits the highest gas response and excellent recovery characteristic to TEA at 200◦C. The sensor shows a low detection limit at ppb level and good long-term stability within three months. In addition, the sensor only has a small variation on baseline resistance, gas response and response/recovery speed under different relative humidity. The promising gas sensing performance can be mainly attributed to the increase of the oxygen vacancies defects caused by the difference of Sn2+and Ni2+, resistance changes and the hollow structure of as-prepared nanofibers.
原文链接：https://www.sciencedirect.com/science/article/pii/S0925400523005166?via%3Dihub
