Cao Jianliang, Qin Cong, Wang Yan, Zhang Bo, Gong Yuxiao, Zhang Huoli, Sun Guang, Bala Hari, Zhang Zhanying
School of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China.
School of Safety Science and Engineering, State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454000, China.
Nanomaterials (Basel). 2017 Apr 29;7(5):98. doi: 10.3390/nano7050098.
The SnO₂/g-C₃N₄ composites were synthesized via a facile calcination method by using SnCl₄·5H₂O and urea as the precursor. The structure and morphology of the as-synthesized composites were characterized by the techniques of X-ray diffraction (XRD), the field-emission scanning electron microscopy and transmission electron microscopy (FESEM and TEM), energy dispersive spectrometry (EDS), thermal gravity and differential thermal analysis (TG-DTA), and N₂-sorption. The analysis results indicated that the as-synthesized samples possess the two dimensional structure. Additionally, the SnO₂ nanoparticles were highly dispersed on the surface of the g-C₃N₄ nanosheets. The gas-sensing performance of the as-synthesized composites for different gases was tested. Moreover, the composite with 7 wt % g-C₃N₄ content (SnO₂/g-C₃N₄-7) exhibits an admirable gas-sensing property to ethanol, which possesses a higher response and better selectivity than that of the pure SnO2-based sensor. The high surface area of the SnO2/g-C3N4 composite and the good electronic characteristics of the two dimensional graphitic carbon nitride are in favor of the elevated gas-sensing property.
通过使用四氯化锡·五水合物和尿素作为前驱体，采用简便的煅烧方法合成了二氧化锡/石墨相氮化碳（SnO₂/g-C₃N₄）复合材料。通过X射线衍射（XRD）、场发射扫描电子显微镜和透射电子显微镜（FESEM和TEM）、能量色散光谱（EDS）、热重和差热分析（TG-DTA）以及N₂吸附等技术对合成的复合材料的结构和形貌进行了表征。分析结果表明，合成的样品具有二维结构。此外，二氧化锡纳米颗粒高度分散在石墨相氮化碳纳米片的表面。测试了合成的复合材料对不同气体的气敏性能。此外，g-C₃N₄含量为7 wt%的复合材料（SnO₂/g-C₃N₄-7）对乙醇表现出令人钦佩的气敏性能，与纯二氧化锡基传感器相比，具有更高的响应和更好的选择性。SnO₂/g-C₃N₄复合材料的高比表面积和二维石墨相氮化碳良好的电子特性有利于提高气敏性能。
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