Solid-State Method Synthesis of SnO₂-Decorated g-C₃N₄ Nanocomposites with Enhanced Gas-Sensing Property to Ethanol.
Solid-State Method Synthesis of SnO₂-Decorated g-C₃N₄ Nanocomposites with Enhanced Gas-Sensing Property to Ethanol.
复制标题
固相法合成SnO2修饰的增强乙醇气敏性能的g-C3N4纳米复合材料
DOI：
10.3390/ma10060604
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发表时间：
2017-05-31
期刊：
影响因子：
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通讯作者：
Zhang Z
中科院分区：
文献类型：
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作者：
Cao J;Qin C;Wang Y;Zhang H;Sun G;Zhang Z
以SnCl 4. 5 H2O和尿素为前驱体，采用固相法制备了SnO 2/石墨氮化碳（g-C3 N4）复合材料。采用X射线衍射（XRD）、场发射扫描电子显微镜（FESEM）、透射电子显微镜（TEM）、能谱仪（EDS）、热重-差热分析（TG-DTA）、X射线光电子能谱（XPS）和N2吸附等技术对复合材料的结构和形貌进行了表征。结果表明，复合材料具有二维结构，SnO 2纳米粒子高度分散在g-C3 N4纳米片的表面。测试了样品对乙醇的气敏性能，结果表明SnO 2/g-C3 N4纳米复合材料具有良好的气敏性能。具有10重量% 2-D g-C3 N4含量的基于传感器的SnO 2/g-C3 N4纳米复合材料对500 ppm乙醇的响应值（Ra/Rg）在300 °C下为550。然而，纯SnO 2的响应值仅为320。SnO 2/g-C3 N4 -10的高比表面积（140 m2·g-1）和二维g-C3 N4与SnO 2之间的相互作用对气敏性能有很大影响。
SnO2/graphitic carbon nitride (g-C3N4) composites were synthesized via a facile solid-state 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), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive spectrometer (EDS), thermogravimetry-differential thermal analysis (TG-DTA), X-ray photoelectron spectroscopy (XPS), and N2 sorption. The results indicated that the composites possessed a two-dimensional (2-D) structure, and the SnO2 nanoparticles were highly dispersed on the surface of the g-C3N4 nanosheets. The gas-sensing performance of the samples to ethanol was tested, and the SnO2/g-C3N4 nanocomposite-based sensor exhibited admirable properties. The response value (Ra/Rg) of the SnO2/g-C3N4 nanocomposite with 10 wt % 2-D g-C3N4 content-based sensor to 500 ppm of ethanol was 550 at 300 °C. However, the response value of pure SnO2 was only 320. The high surface area of SnO2/g-C3N4-10 (140 m2·g−1) and the interaction between 2-D g-C3N4 and SnO2 could strongly affect the gas-sensing property.