Shendan Zhang,Chenhao Wang,Fengdong Qu,Siqi Liu,Cheng-Te Lin,Shiyu Du,Yousi Chen,Fanli Meng,Minghui Yang
Surface modification is a simple and effective means to promote the sensing performance of metal oxide semiconductor-based gas sensors. Marigold-shaped ZnO nanoflowers are fabricated via a simple precipitation reaction and subsequently catalytically modified with RuO2 on the surface through an ethylene glycol solvothermal treatment. The experimental results have proven that a very low content of Ru on the surface of ZnO exists in an oxidized state. However, the gas response of the sensor based on RuO2-modified ZnO is remarkably improved by 17 times to 100 ppm acetone with the decrease of optimal operating temperature from 219 °C–172 °C and reduction in recovery time from 79–52 s. The sensing enhancement mechanism of surface modification can be attributed to the formation of massive small heterostructure between p-type RuO2 ultrasmall nanoparticles and n-type ZnO as well as the catalytic effect of Ru4+ and a rougher surface.
Shendan Zhang,Yunan Wang,Fengdong Qu,Tiju Thomas,Minghui Yang
Indium oxide (In 2 O 3 ) nanocubes modified by ruthenium oxide (RuO 2 ) on the surface are successfully prepared through hydrothermal method , calcination and impregnation in turn. The sensing properties of RuO 2 -modified In 2 O 3 sensing material are significantly enhanced even with low loading amount. The response values of RuO 2 -modified In 2 O 3 sensing material to TXM vapor containing benzyl group (including toluene, xylene and mesitylene) increase rapidly when compared to various volatile organic compounds (VOCs). Therein the RuO 2 -modified In 2 O 3 sensor displays a 36-times increase in response value to mesitylene (100 ppm) in contrast to un-modified one at 255 °C. The optimum operating temperature (OOT) decreases obviously from 375 °C of pristine In 2 O 3 one. The gas sensing enhancement mechanism can be explained by electronic and chemical sensitization. However, the reason for selectivity change will be (temporarily) investigated further later.
危险品化学品经营许可证（带存储）