Self-assembled SnO_2 Colloidal Particles and Their Gas Sensing Performance to H_2, C_2H_5OH and LPG  

作　　者：季红军 汪信 

机构地区：[1]Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, Nanjing University of Science and Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2011年第4期661-667,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China (No. 50772048);the Natural Science Foundation of China and China Academy Engineering Physics (No. 10776014);the innovation fund from the Graduate School of Nanjing University of Science and Technology

摘　　要：Using organo-tin Sn（OC4H9）4 as precursor, sodium dodecyl sulfonate （SDS） and SDS-gelatin （SDS-G） complex as template, two tin dioxide colloidal particles were prepared by a self-assembly method. Both SnO2 products were respectively labelled SnO2-B particles with SDS and SnO2-C particles with SDS-G, which are applied in fabricating SnO2 gas sensors corresponding to SnO2-B＇ and SnO2-C＇ sensors. X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and thermo-gravimetry and different thermal analysis （TG/DTA） were used for characterizations. The experimental results show that SnO2-B colloidal particles are composed of mesoporous piece-like particles, while SnO2-C particles mainly consist of spherical particles. Gas sensing measurements show that SnO2-B＇ sensor performs the best sensing response to all target gases, including H2, C2H5OH and liquid petroleum gas （LPG）. In particular, the sensing response of SnO2-B＇ sensor is achieved at 32 in H2 atmosphere at the concentration of 1000×10-6 M. The gas sensing mechanism was purposely discussed from the electron transfer process and the microstructures of the as-prepared SnO2 products. It is found that serious agglomerations in SnO2-B＇ particles facilitate the high gas sensing performance of SnO2-B＇ sensor, while mesoporous structures in SnO2-C＇ particles decrease the gas sensing response of SnO2-C＇ sensor.Using organo-tin Sn（OC4H9）4 as precursor, sodium dodecyl sulfonate （SDS） and SDS-gelatin （SDS-G） complex as template, two tin dioxide colloidal particles were prepared by a self-assembly method. Both SnO2 products were respectively labelled SnO2-B particles with SDS and SnO2-C particles with SDS-G, which are applied in fabricating SnO2 gas sensors corresponding to SnO2-B＇ and SnO2-C＇ sensors. X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and thermo-gravimetry and different thermal analysis （TG/DTA） were used for characterizations. The experimental results show that SnO2-B colloidal particles are composed of mesoporous piece-like particles, while SnO2-C particles mainly consist of spherical particles. Gas sensing measurements show that SnO2-B＇ sensor performs the best sensing response to all target gases, including H2, C2H5OH and liquid petroleum gas （LPG）. In particular, the sensing response of SnO2-B＇ sensor is achieved at 32 in H2 atmosphere at the concentration of 1000×10-6 M. The gas sensing mechanism was purposely discussed from the electron transfer process and the microstructures of the as-prepared SnO2 products. It is found that serious agglomerations in SnO2-B＇ particles facilitate the high gas sensing performance of SnO2-B＇ sensor, while mesoporous structures in SnO2-C＇ particles decrease the gas sensing response of SnO2-C＇ sensor.

关 键 词：SNO2 gas sensors SELF-ASSEMBLE SDS GELATIN 

分 类 号：O621.3[理学—有机化学]