Self-assembled SnO2 Colloidal Particles and Their Gas Sensing Performance to H2, C2H5OH and LPG
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2011年第4期
论文作者：季红军 汪信
文章页码：661 - 667
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.
季红军，汪信
Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, 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.
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