The State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals

Kunming, China

The State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals

Kunming, China
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Zhu Q.,Yunnan University | Zhang Y.-M.,Yunnan University | Hu C.-Y.,The State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals | Zhang J.,Yunnan University | Liu Q.-J.,Yunnan University
Gongneng Cailiao/Journal of Functional Materials | Year: 2014

Oxide semiconductor gas sensor possesses exceptional properties such as high sensitivity, low cost, simple method of measurement and convenience of use, which has great utilization potentiality in the aspect of the real-time detection of toxic and harmful gases. In this paper, the research progress, the existing problems, and the development trends of modified metal oxide semiconductor gas sensor was summarized.


Zhang J.,Yunnan University | Zhang Y.M.,Yunnan University | Hu C.Y.,The State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals | Zhu Z.Q.,Yunnan University | Liu Q.J.,Yunnan University
Advanced Materials Research | Year: 2014

The gas-sensing properties of zinc doped lanthanum ferrite (Zn-LaFeO3) compounds for formaldehyde were investigated in this paper. Zn-LaFeO3 powders were prepared using sol-gel method combined with microwave chemical synthesis. The powders were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The formaldehyde gas-sensing characteristics for the sample were examined. The experimental results indicate that the sensor based on the sample Zn-LaFeO3 shows excellent gas-sensing properties to formaldehyde gas. At the optimal operating temperature of 250°C, the sensitivity of the sensor based on LaFe0.7Zn0.3O3 to 100ppm formaldehyde is 38, while to other test gases, the sensitivity is all lower than 20. The response and recovery times for the sample to formaldehyde gas are 100s and 100s, respectively. © (2014) Trans Tech Publications, Switzerland.


Zhang Y.M.,Yunnan University | Hu C.Y.,The State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals | Zhang J.,Yunnan University | Liu Q.J.,Yunnan University | And 2 more authors.
Materials Science Forum | Year: 2016

A novel gas sensor for the determination of formaldehyde was developed based on molecular imprinting technique (MIT). MIT was for the first time used to recognize small organic molecule by our group. The molecular imprinting nanoparticles (MINs) with a small dimension which possess extremely high surface-to-volume ratio were synthesized using imprinting polymerization with formaldehyde as template and Ag-LaFeO3 as substrate material. The structure of the MINs is orthogonal perovskite. And then the MINs were printed onto an alumina tube. Subsequently, a high selectivity molecular imprinting gas sensor for detection of formaldehyde was achieved. At 86ºC, the response to 0.5 ppm formaldehyde based on the sensor is 16, and the response is lower than 2 for the other test gases. The response time and recovery time are 55 s and 40 s, respectively. © 2016 Trans Tech Publications, Switzerland.

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